UK FLIGHT DELAY INDEX

derived from CAA punctuality statistics for UK reporting airports

How often are these flights late or cancelled?

China Southern

In the twelve months from July 2025 to June 2026, 13.2% of 1,056 movements arriving into the UK were disrupted — more than fifteen minutes late or cancelled at short notice.

Put the other way round, 86.8% of 1,056 movements met the fifteen-minute convention. These are historical observations, not a forecast.

Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Source: CAA punctuality statistics · snapshot 17/08/2026 10:24 · method route-record-v2.1 · Versioned claims, formulas and entity mapping.

0 operations (0.00%) excluded because their published percentages could not be reconciled to whole numbers. Excluded operations enter neither the numerator nor the denominator. Outcome figures and comparisons are unavailable when the excluded share exceeds fifteen percent.

The four numbers at a glance

13.2% of 1,056 movements were disrupted over July 2025 to June 2026.

Average delay covers delayed movements only. Its range reflects rounded source means and the unknown count of exactly punctual movements.

DisruptionShort-notice cancellationsDelay among delayed movementsOver three hours
13.2% of 1,056 movementsno events in 1,056 movements25.2–61.6 minutes; delayed denominator 139–2990.3% of 1,056 movements
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

When late, how late?

0.3% of 1,056 movements passed the three-hour mark.

The ladder shows how many movements crossed each threshold. Cancellations are separate: no events in 1,056 movements.

DelayShare and sampleOne event per movements
More than 15 minutes13.2% of 1,056 movements7.6
More than 30 minutes7.3% of 1,056 movements13.7
More than 60 minutes2.5% of 1,056 movements40.6
More than 120 minutes0.9% of 1,056 movements105.6
More than 180 minutes0.3% of 1,056 movements352.0
More than 360 minutes0.1% of 1,056 movements1,056.0
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Slightly late or occasionally a disaster?

0.9% of 1,056 movements passed two hours.

The histogram shows the published delay bands. Bucket shares use all reported operations, including unmatched records; cancellations are reported separately.

Nine delay buckets, minutes; share of all recorded operations>15 early49947.3%15–1 early25824.4%0–15 late16015.2%16–30625.9%31–60514.8%61…120161.5%121…18070.7%181…36020.2%>36010.1%D=1,056
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Better or worse since the start of the archive?

Best month: Feb 2025, 2.9% of 70 movements. Worst month: Oct 2023, 68.2% of 66 movements.

The line traces every month. Lower disruption is better; gaps are never zeros. Pandemic readings describe a different operating regime.

Monthly disruption share; gaps mean no published dataJan 2018: 17.1%; sample: 412018Feb 2018: 0.0%; sample: 34Mar 2018: 12.8%; sample: 39Apr 2018: 46.7%; sample: 30May 2018: 12.5%; sample: 32Jun 2018: 30.2%; sample: 43Jul 2018: 28.0%; sample: 50Aug 2018: 42.6%; sample: 54Sep 2018: 49.0%; sample: 51Oct 2018: 40.0%; sample: 50Nov 2018: 18.8%; sample: 48Dec 2018: 17.6%; sample: 51Jan 2019: 8.2%; sample: 492019Feb 2019: 22.5%; sample: 40Mar 2019: 25.5%; sample: 51Apr 2019: 50.0%; sample: 50May 2019: 51.0%; sample: 49Jun 2019: 26.0%; sample: 50Jul 2019: 17.7%; sample: 62Aug 2019: 27.1%; sample: 59Sep 2019: 25.4%; sample: 59Oct 2019: 58.5%; sample: 53Nov 2019: 41.2%; sample: 51Dec 2019: 30.5%; sample: 59Jan 2020: 33.3%; sample: 602020Feb 2020: suppressed: fewer than twenty movements×Mar 2020: suppressed: fewer than twenty movements×Apr 2020: suppressed: fewer than twenty movements×May 2020: suppressed: fewer than twenty movements×Jun 2020: suppressed: fewer than twenty movements×Jul 2020: suppressed: fewer than twenty movements×Aug 2020: suppressed: fewer than twenty movements×Sep 2020: suppressed: fewer than twenty movements×Oct 2020: suppressed: fewer than twenty movements×Nov 2020: suppressed: fewer than twenty movements×Dec 2020: suppressed: fewer than twenty movements×Jan 2021: suppressed: fewer than twenty movements×2021Feb 2021: suppressed: fewer than twenty movements×Mar 2021: suppressed: fewer than twenty movements×Apr 2021: suppressed: fewer than twenty movements×May 2021: suppressed: fewer than twenty movements×Jun 2021: suppressed: fewer than twenty movements×Jul 2021: suppressed: fewer than twenty movements×Aug 2021: suppressed: fewer than twenty movements×Sep 2021: suppressed: fewer than twenty movements×Oct 2021: suppressed: fewer than twenty movements×Nov 2021: suppressed: fewer than twenty movements×Dec 2021: suppressed: fewer than twenty movements×Jan 2022: no data×2022Feb 2022: no data×Mar 2022: suppressed: fewer than twenty movements×Apr 2022: no data×May 2022: no data×Jun 2022: no data×Jul 2022: no data×Aug 2022: suppressed: fewer than twenty movements×Sep 2022: suppressed: fewer than twenty movements×Oct 2022: suppressed: fewer than twenty movements×Nov 2022: suppressed: fewer than twenty movements×Dec 2022: suppressed: fewer than twenty movements×Jan 2023: suppressed: fewer than twenty movements×2023Feb 2023: suppressed: fewer than twenty movements×Mar 2023: suppressed: fewer than twenty movements×Apr 2023: 72.0%; sample: 25May 2023: 52.9%; sample: 34Jun 2023: 50.0%; sample: 54Jul 2023: 35.5%; sample: 62Aug 2023: 42.9%; sample: 63Sep 2023: 38.5%; sample: 65Oct 2023: 68.2%; sample: 66Nov 2023: 28.1%; sample: 57Dec 2023: 34.7%; sample: 75Jan 2024: 20.0%; sample: 802024Feb 2024: 40.5%; sample: 74Mar 2024: 26.7%; sample: 75Apr 2024: 57.7%; sample: 78May 2024: 22.1%; sample: 77Jun 2024: 27.7%; sample: 83Jul 2024: 25.8%; sample: 93Aug 2024: 31.2%; sample: 93Sep 2024: 21.3%; sample: 89Oct 2024: 38.3%; sample: 81Nov 2024: 18.2%; sample: 66Dec 2024: 9.5%; sample: 74Jan 2025: 20.0%; sample: 852025Feb 2025: 2.9%; sample: 70Mar 2025: 10.0%; sample: 70Apr 2025: 16.7%; sample: 78May 2025: 23.3%; sample: 73Jun 2025: 13.7%; sample: 73Jul 2025: 9.7%; sample: 93Aug 2025: 11.8%; sample: 93Sep 2025: 12.2%; sample: 90Oct 2025: 3.3%; sample: 90Nov 2025: 20.5%; sample: 78Dec 2025: 17.6%; sample: 91Jan 2026: 11.5%; sample: 872026Feb 2026: 9.2%; sample: 76Mar 2026: 10.6%; sample: 85Apr 2026: 23.3%; sample: 90May 2026: 17.2%; sample: 93Jun 2026: 11.1%; sample: 90Pandemic regime Jun 2020Summer 2022 breakdown Jul 2022NATS system failure Aug 2023Heathrow fire closure Mar 2025100%0%
Every monthly observation
MonthDisruption on arrivals
Jan 201817.1% of 41 movements — small sample, not ranked
Feb 2018no events in 34 movements — small sample, not ranked
Mar 201812.8% of 39 movements — small sample, not ranked
Apr 201846.7% of 30 movements — small sample, not ranked
May 201812.5% of 32 movements — small sample, not ranked
Jun 201830.2% of 43 movements — small sample, not ranked
Jul 201828.0% of 50 movements
Aug 201842.6% of 54 movements
Sep 201849.0% of 51 movements
Oct 201840.0% of 50 movements
Nov 201818.8% of 48 movements — small sample, not ranked
Dec 201817.6% of 51 movements
Jan 20198.2% of 49 movements — small sample, not ranked
Feb 201922.5% of 40 movements — small sample, not ranked
Mar 201925.5% of 51 movements
Apr 201950.0% of 50 movements
May 201951.0% of 49 movements — small sample, not ranked
Jun 201926.0% of 50 movements
Jul 201917.7% of 62 movements
Aug 201927.1% of 59 movements
Sep 201925.4% of 59 movements
Oct 201958.5% of 53 movements
Nov 201941.2% of 51 movements
Dec 201930.5% of 59 movements
Jan 202033.3% of 60 movements
Feb 2020suppressed: fewer than twenty movements
Mar 2020suppressed: fewer than twenty movements
Apr 2020suppressed: fewer than twenty movements
May 2020suppressed: fewer than twenty movements
Jun 2020suppressed: fewer than twenty movements
Jul 2020suppressed: fewer than twenty movements
Aug 2020suppressed: fewer than twenty movements
Sep 2020suppressed: fewer than twenty movements
Oct 2020suppressed: fewer than twenty movements
Nov 2020suppressed: fewer than twenty movements
Dec 2020suppressed: fewer than twenty movements
Jan 2021suppressed: fewer than twenty movements
Feb 2021suppressed: fewer than twenty movements
Mar 2021suppressed: fewer than twenty movements
Apr 2021suppressed: fewer than twenty movements
May 2021suppressed: fewer than twenty movements
Jun 2021suppressed: fewer than twenty movements
Jul 2021suppressed: fewer than twenty movements
Aug 2021suppressed: fewer than twenty movements
Sep 2021suppressed: fewer than twenty movements
Oct 2021suppressed: fewer than twenty movements
Nov 2021suppressed: fewer than twenty movements
Dec 2021suppressed: fewer than twenty movements
Jan 2022no data
Feb 2022no data
Mar 2022suppressed: fewer than twenty movements
Apr 2022no data
May 2022no data
Jun 2022no data
Jul 2022no data
Aug 2022suppressed: fewer than twenty movements
Sep 2022suppressed: fewer than twenty movements
Oct 2022suppressed: fewer than twenty movements
Nov 2022suppressed: fewer than twenty movements
Dec 2022suppressed: fewer than twenty movements
Jan 2023suppressed: fewer than twenty movements
Feb 2023suppressed: fewer than twenty movements
Mar 2023suppressed: fewer than twenty movements
Apr 202372.0% of 25 movements — small sample, not ranked
May 202352.9% of 34 movements — small sample, not ranked
Jun 202350.0% of 54 movements
Jul 202335.5% of 62 movements
Aug 202342.9% of 63 movements
Sep 202338.5% of 65 movements
Oct 202368.2% of 66 movements
Nov 202328.1% of 57 movements
Dec 202334.7% of 75 movements
Jan 202420.0% of 80 movements
Feb 202440.5% of 74 movements
Mar 202426.7% of 75 movements
Apr 202457.7% of 78 movements
May 202422.1% of 77 movements
Jun 202427.7% of 83 movements
Jul 202425.8% of 93 movements
Aug 202431.2% of 93 movements
Sep 202421.3% of 89 movements
Oct 202438.3% of 81 movements
Nov 202418.2% of 66 movements
Dec 20249.5% of 74 movements
Jan 202520.0% of 85 movements
Feb 20252.9% of 70 movements
Mar 202510.0% of 70 movements
Apr 202516.7% of 78 movements
May 202523.3% of 73 movements
Jun 202513.7% of 73 movements
Jul 20259.7% of 93 movements
Aug 202511.8% of 93 movements
Sep 202512.2% of 90 movements
Oct 20253.3% of 90 movements
Nov 202520.5% of 78 movements
Dec 202517.6% of 91 movements
Jan 202611.5% of 87 movements
Feb 20269.2% of 76 movements
Mar 202610.6% of 85 movements
Apr 202623.3% of 90 movements
May 202617.2% of 93 movements
Jun 202611.1% of 90 movements
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

What did the big disruptions do here?

Each event is compared with the twelve preceding calendar months and the first later return to baseline.

A worse month is not proof the named event caused it. The open data carry no delay-cause field. Recovery is observed for at most eight subsequent months.

EventDirectionDisruption that monthBaseline beforeReturn to baseline
Pandemic regime · Jun 2020Arrivalssuppressed: fewer than twenty movementsno complete baselinenot enough data: needs a complete baseline and a publishable event month
Pandemic regime · Jun 2020Departuressuppressed: fewer than twenty movementsno complete baselinenot enough data: needs a complete baseline and a publishable event month
Summer 2022 breakdown · Jul 2022Arrivalsno datano complete baselinenot enough data: needs a complete baseline and a publishable event month
Summer 2022 breakdown · Jul 2022Departuresno datano complete baselinenot enough data: needs a complete baseline and a publishable event month
NATS system failure · Aug 2023Arrivals42.9% of 63 movementsno complete baselinenot enough data: needs a complete baseline and a publishable event month
NATS system failure · Aug 2023Departures9.5% of 63 movementsno complete baselinenot enough data: needs a complete baseline and a publishable event month
Heathrow fire closure · Mar 2025Arrivals10.0% of 70 movements25.1% across 964 flightsreturned the next month
Heathrow fire closure · Mar 2025Departures4.3% of 70 movements12.1% across 962 flightsreturned the next month
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Which time of year has been hardest?

Highest median: Apr, 48.3% across 6 months. Lowest median: Feb, 9.2% across 5 months.

Even the same calendar month differs across years. This is a record, not a forecast; pandemic years are excluded from the summaries.

Each cell is one calendar month of one year; the number is the share of that month’s arrivals that were disrupted. Darker means worse. A blank cell means no published data, not zero.

Seasonality: calendar month by year; share and nJanFebMarAprMayJunJulAugSepOctNovDec20198.2% of 49 movements †22.5% of 40 movements †25.5% of 51 movements50.0% of 50 movements51.0% of 49 movements †26.0% of 50 movements17.7% of 62 movements27.1% of 59 movements25.4% of 59 movements58.5% of 53 movements41.2% of 51 movements30.5% of 59 movements202033.3% of 60 movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movements2021suppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movements2022no datano datasuppressed: fewer than twenty movementsno datano datano datano datasuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movements2023suppressed: fewer than twenty movementssuppressed: fewer than twenty movementssuppressed: fewer than twenty movements72.0% of 25 movements †52.9% of 34 movements †50.0% of 54 movements35.5% of 62 movements42.9% of 63 movements38.5% of 65 movements68.2% of 66 movements28.1% of 57 movements34.7% of 75 movements202420.0% of 80 movements40.5% of 74 movements26.7% of 75 movements57.7% of 78 movements22.1% of 77 movements27.7% of 83 movements25.8% of 93 movements31.2% of 93 movements21.3% of 89 movements38.3% of 81 movements18.2% of 66 movements9.5% of 74 movements202520.0% of 85 movements2.9% of 70 movements10.0% of 70 movements16.7% of 78 movements23.3% of 73 movements13.7% of 73 movements9.7% of 93 movements11.8% of 93 movements12.2% of 90 movements3.3% of 90 movements20.5% of 78 movements17.6% of 91 movements202611.5% of 87 movements9.2% of 76 movements10.6% of 85 movements23.3% of 90 movements17.2% of 93 movements11.1% of 90 movementsno datano datano datano datano datano data
Month-by-month table: median, observed range and sample
MonthMedianObserved rangeSample
Jan17.1%8.2–20.0%5 months, 342 flights
Feb9.2%0.0–40.5%5 months, 294 flights
Mar12.8%10.0–26.7%5 months, 320 flights
Apr48.3%16.7–72.0%6 months, 351 flights
May22.7%12.5–52.9%6 months, 358 flights
Jun26.9%11.1–50.0%6 months, 393 flights
Jul25.8%9.7–35.5%5 months, 360 flights
Aug31.2%11.8–42.9%5 months, 362 flights
Sep25.4%12.2–49.0%5 months, 354 flights
Oct40.0%3.3–68.2%5 months, 340 flights
Nov20.5%18.2–41.2%5 months, 300 flights
Dec17.6%9.5–34.7%5 months, 350 flights
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Which routes have the best and worst record?

Lowest disruption: LGW ↔ ZHENGZHOU-XINZHENG, 3.8% of 105 movements. Highest disruption: LHR ↔ GUANGZHOU-BAIYUN-INTERNATIONAL, 20.0% of 375 movements.

The airline table uses this carrier on each route; airport and country tables combine carriers. Each figure is arrivals into its UK airport. Only sufficiently large exact samples enter the ordered comparison.

Observed disruption share by optionLgw ↔ Zhengzhou-Xinzheng3.8% of 105 flightsLhr ↔ Wuhan-Tianhe-International3.8% of 104 flightsLhr ↔ Beijing-Daxing-Internationa…9.6% of 365 flightsLgw ↔ Guangzhou-Baiyun-Internatio…19.6% of 107 flightsLhr ↔ Guangzhou-Baiyun-Internatio…20.0% of 375 flights
All route comparisons and sample flags
RouteDisruptionCancellationsSample flag
LGW ↔ ZHENGZHOU-XINZHENG3.8% of 105 movementsno events in 105 movementsdescriptive comparison
LHR ↔ WUHAN-TIANHE-INTERNATIONAL3.8% of 104 movementsno events in 104 movementsdescriptive comparison
LHR ↔ BEIJING-DAXING-INTERNATIONAL-AIRPORT9.6% of 365 movementsno events in 365 movementsdescriptive comparison
LGW ↔ GUANGZHOU-BAIYUN-INTERNATIONAL19.6% of 107 movementsno events in 107 movementsdescriptive comparison
LHR ↔ GUANGZHOU-BAIYUN-INTERNATIONAL20.0% of 375 movementsno events in 375 movementsdescriptive comparison
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Which UK airports appear in this record?

2 published groups have enough arrivals to describe.

These operations are not matched for season, aircraft or time of day. The table makes no causal comparison.

UK airportDisruptionSample flag
Gatwick11.8% of 212 movementsdescriptive comparison
Heathrow13.5% of 844 movementsdescriptive comparison
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Arrivals vs departures

13.2% of 1,056 movements arrivals were disrupted, against 9.0% of 1,060 movements departures.

The directions have separate denominators. A departure delay does not establish late arrival at the final destination; legal conditions differ by direction and carrier.

Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Movements past the three-hour mark

0.3% of 1,056 movements were more than three hours late over July 2025 to June 2026.

Cancellation is counted separately and is not a three-hour delay. Monthly counts cannot establish a passenger claim.

Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Facts about this record

China Southern appears from Jan 2018 to Jun 2026 with 4,295 arrivals.

The bounds describe the published record, not every commercial service. Final point is not necessarily a nonstop destination.

Archive route pairs: 13.

Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

What this data cannot tell you

Delay cause, individual passenger experience, commercial decisions and future performance are not established here.

Also absent are aircraft type, within-month time-of-day splits and cancellations made ahead of the short-notice reporting window.

0 operations (0.00%) excluded because their published percentages could not be reconciled to whole numbers. Excluded operations enter neither the numerator nor the denominator. Outcome figures and comparisons are unavailable when the excluded share exceeds fifteen percent.

Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Quick answers

These answers use the same populations and window as the tables above.

Every percentage retains its denominator.

How disrupted are these arrivals?

13.2% of 1,056 movements over July 2025 to June 2026.

How often are they cancelled?

no events in 1,056 movements at short notice.

How late is late?

25.2–61.6 minutes; delayed denominator 139–299

Are services improving?

The monthly line records past changes; it is not a forecast or a causal comparison.

Which routes are compared?

The route table uses separately identified UK airport and final-point pairs, with small samples flagged.

Does this cover my flight?

Only published aggregate movements; the circumstances of any individual flight are unknown.

Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

How this was calculated

Source: CAA punctuality statistics · snapshot 17/08/2026 10:24 · method route-record-v2.1 · Versioned claims, formulas and entity mapping.

Integer bucket counts are recovered from rounding intervals over D=M+C+U with their sum constrained to M. Ambiguous counts remain ranges; failed reconciliation is quarantined.

Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.

Your trip has already gone wrong

The monthly line and events table show whether your month was typical or unusual in the published record.

Nothing here decides an individual case or what a passenger may be owed.

CAA: the official route to complain
Definitions, denominators and limits

Arrivals into UK reporting airports only unless labelled departures. Denominator: operated movements plus short-notice cancellations (M+C). A movement is not a scheduled flight. Unmatched records are data quality, not outcomes. Cells below twenty movements are suppressed; twenty to forty-nine are descriptive and not ranked.