UK FLIGHT DELAY INDEX

derived from CAA punctuality statistics for UK reporting airports

How often are these flights late or cancelled?

Wizz Air Malta

In the twelve months from July 2025 to June 2026, 20.4% of 7,549 movements arriving into the UK were disrupted — more than fifteen minutes late or cancelled at short notice.

Put the other way round, 79.6% of 7,549 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

20.4% of 7,549 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
20.4% of 7,549 movements0.3% of 7,549 movements28.8–66.5 minutes; delayed denominator 1,512–3,2380.6% of 7,549 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?

0.6% of 7,549 movements passed the three-hour mark.

The ladder shows how many movements crossed each threshold. Cancellations are separate: 0.3% of 7,549 movements.

DelayShare and sampleOne event per movements
More than 15 minutes20.0% of 7,549 movements5.0
More than 30 minutes12.2% of 7,549 movements8.2
More than 60 minutes6.0% of 7,549 movements16.6
More than 120 minutes1.7% of 7,549 movements57.6
More than 180 minutes0.6% of 7,549 movements171.6
More than 360 minutes0.1% of 7,549 movements1,078.4
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?

1.7% of 7,549 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 early1,61621.4%15–1 early2,66935.4%0–15 late1,72622.9%16–305947.9%31–604636.1%61…1203244.3%121…180871.2%181…360370.5%>36070.1%D=7,549
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: Mar 2025, 7.5% of 626 movements. Worst month: Jul 2023, 66.4% of 354 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: no data×2018Feb 2018: no data×Mar 2018: no data×Apr 2018: no data×May 2018: no data×Jun 2018: no data×Jul 2018: no data×Aug 2018: no data×Sep 2018: no data×Oct 2018: no data×Nov 2018: no data×Dec 2018: no data×Jan 2019: no data×2019Feb 2019: no data×Mar 2019: no data×Apr 2019: no data×May 2019: no data×Jun 2019: no data×Jul 2019: no data×Aug 2019: no data×Sep 2019: no data×Oct 2019: no data×Nov 2019: no data×Dec 2019: no data×Jan 2020: no data×2020Feb 2020: no data×Mar 2020: no data×Apr 2020: no data×May 2020: no data×Jun 2020: no data×Jul 2020: no data×Aug 2020: no data×Sep 2020: no data×Oct 2020: no data×Nov 2020: no data×Dec 2020: no data×Jan 2021: no data×2021Feb 2021: no data×Mar 2021: no data×Apr 2021: no data×May 2021: no data×Jun 2021: no data×Jul 2021: no data×Aug 2021: no data×Sep 2021: no data×Oct 2021: no data×Nov 2021: no data×Dec 2021: no data×Jan 2022: no data×2022Feb 2022: no data×Mar 2022: no data×Apr 2022: no data×May 2022: no data×Jun 2022: no data×Jul 2022: no data×Aug 2022: no data×Sep 2022: no data×Oct 2022: no data×Nov 2022: no data×Dec 2022: no data×Jan 2023: no data×2023Feb 2023: no data×Mar 2023: no data×Apr 2023: no data×May 2023: no data×Jun 2023: 48.1%; sample: 324Jul 2023: 66.4%; sample: 354Aug 2023: 49.9%; sample: 353Sep 2023: 41.7%; sample: 331Oct 2023: 33.6%; sample: 360Nov 2023: 18.5%; sample: 595Dec 2023: 26.9%; sample: 695Jan 2024: 26.6%; sample: 6772024Feb 2024: 11.9%; sample: 607Mar 2024: 11.4%; sample: 665Apr 2024: 19.1%; sample: 658May 2024: 16.3%; sample: 674Jun 2024: 38.4%; sample: 649Jul 2024: 54.7%; sample: 644Aug 2024: 44.2%; sample: 650Sep 2024: 39.4%; sample: 632Oct 2024: 27.8%; sample: 661Nov 2024: 9.7%; sample: 607Dec 2024: 11.3%; sample: 648Jan 2025: 17.1%; sample: 6482025Feb 2025: 10.0%; sample: 568Mar 2025: 7.5%; sample: 626Apr 2025: 12.9%; sample: 614May 2025: 11.9%; sample: 607Jun 2025: 18.3%; sample: 600Jul 2025: 26.9%; sample: 621Aug 2025: 28.5%; sample: 635Sep 2025: 31.3%; sample: 613Oct 2025: 27.2%; sample: 636Nov 2025: 11.2%; sample: 578Dec 2025: 16.5%; sample: 644Jan 2026: 28.3%; sample: 6722026Feb 2026: 21.2%; sample: 594Mar 2026: 11.2%; sample: 652Apr 2026: 10.8%; sample: 657May 2026: 11.2%; sample: 645Jun 2026: 20.3%; sample: 602Pandemic regime Jun 2020Summer 2022 breakdown Jul 2022NATS system failure Aug 2023Heathrow fire closure Mar 2025100%0%
Every monthly observation
MonthDisruption on arrivals
Jan 2018no data
Feb 2018no data
Mar 2018no data
Apr 2018no data
May 2018no data
Jun 2018no data
Jul 2018no data
Aug 2018no data
Sep 2018no data
Oct 2018no data
Nov 2018no data
Dec 2018no data
Jan 2019no data
Feb 2019no data
Mar 2019no data
Apr 2019no data
May 2019no data
Jun 2019no data
Jul 2019no data
Aug 2019no data
Sep 2019no data
Oct 2019no data
Nov 2019no data
Dec 2019no data
Jan 2020no data
Feb 2020no data
Mar 2020no data
Apr 2020no data
May 2020no data
Jun 2020no data
Jul 2020no data
Aug 2020no data
Sep 2020no data
Oct 2020no data
Nov 2020no data
Dec 2020no data
Jan 2021no data
Feb 2021no data
Mar 2021no data
Apr 2021no data
May 2021no data
Jun 2021no data
Jul 2021no data
Aug 2021no data
Sep 2021no data
Oct 2021no data
Nov 2021no data
Dec 2021no data
Jan 2022no data
Feb 2022no data
Mar 2022no data
Apr 2022no data
May 2022no data
Jun 2022no data
Jul 2022no data
Aug 2022no data
Sep 2022no data
Oct 2022no data
Nov 2022no data
Dec 2022no data
Jan 2023no data
Feb 2023no data
Mar 2023no data
Apr 2023no data
May 2023no data
Jun 202348.1% of 324 movements
Jul 202366.4% of 354 movements
Aug 202349.9% of 353 movements
Sep 202341.7% of 331 movements
Oct 202333.6% of 360 movements
Nov 202318.5% of 595 movements
Dec 202326.9% of 695 movements
Jan 202426.6% of 677 movements
Feb 202411.9% of 607 movements
Mar 202411.4% of 665 movements
Apr 202419.1% of 658 movements
May 202416.3% of 674 movements
Jun 202438.4% of 649 movements
Jul 202454.7% of 644 movements
Aug 202444.2% of 650 movements
Sep 202439.4% of 632 movements
Oct 202427.8% of 661 movements
Nov 20249.7% of 607 movements
Dec 202411.3% of 648 movements
Jan 202517.1% of 648 movements
Feb 202510.0% of 568 movements
Mar 20257.5% of 626 movements
Apr 202512.9% of 614 movements
May 202511.9% of 607 movements
Jun 202518.3% of 600 movements
Jul 202526.9% of 621 movements
Aug 202528.5% of 635 movements
Sep 202531.3% of 613 movements
Oct 202527.2% of 636 movements
Nov 202511.2% of 578 movements
Dec 202516.5% of 644 movements
Jan 202628.3% of 672 movements
Feb 202621.2% of 594 movements
Mar 202611.2% of 652 movements
Apr 202610.8% of 657 movements
May 202611.2% of 645 movements
Jun 202620.3% of 602 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 2020Arrivalsno datano complete baselinenot enough data: needs a complete baseline and a publishable event month
Pandemic regime · Jun 2020Departuresno datano 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 2023Arrivals49.9% of 353 movementsno complete baselinenot enough data: needs a complete baseline and a publishable event month
NATS system failure · Aug 2023Departures77.1% of 353 movementsno complete baselinenot enough data: needs a complete baseline and a publishable event month
Heathrow fire closure · Mar 2025Arrivals7.5% of 626 movements25.0% across 7,704 flightsreturned the next month
Heathrow fire closure · Mar 2025Departures16.8% of 626 movements41.7% across 7,711 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: Jul, 54.7% across 3 months. Lowest median: Mar, 11.2% across 3 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 nJanFebMarAprMayJunJulAugSepOctNovDec2019no datano datano datano datano datano datano datano datano datano datano datano data2020no datano datano datano datano datano datano datano datano datano datano datano data2021no datano datano datano datano datano datano datano datano datano datano datano data2022no datano datano datano datano datano datano datano datano datano datano datano data2023no datano datano datano datano data48.1% of 324 movements66.4% of 354 movements49.9% of 353 movements41.7% of 331 movements33.6% of 360 movements18.5% of 595 movements26.9% of 695 movements202426.6% of 677 movements11.9% of 607 movements11.4% of 665 movements19.1% of 658 movements16.3% of 674 movements38.4% of 649 movements54.7% of 644 movements44.2% of 650 movements39.4% of 632 movements27.8% of 661 movements9.7% of 607 movements11.3% of 648 movements202517.1% of 648 movements10.0% of 568 movements7.5% of 626 movements12.9% of 614 movements11.9% of 607 movements18.3% of 600 movements26.9% of 621 movements28.5% of 635 movements31.3% of 613 movements27.2% of 636 movements11.2% of 578 movements16.5% of 644 movements202628.3% of 672 movements21.2% of 594 movements11.2% of 652 movements10.8% of 657 movements11.2% of 645 movements20.3% of 602 movementsno datano datano datano datano datano data
Month-by-month table: median, observed range and sample
MonthMedianObserved rangeSample
Jan26.6%17.1–28.3%3 months, 1,997 flights
Feb11.9%10.0–21.2%3 months, 1,769 flights
Mar11.2%7.5–11.4%3 months, 1,943 flights
Apr12.9%10.8–19.1%3 months, 1,929 flights
May11.9%11.2–16.3%3 months, 1,926 flights
Jun29.3%18.3–48.1%4 months, 2,175 flights
Jul54.7%26.9–66.4%3 months, 1,619 flights
Aug44.2%28.5–49.9%3 months, 1,638 flights
Sep39.4%31.3–41.7%3 months, 1,576 flights
Oct27.8%27.2–33.6%3 months, 1,657 flights
Nov11.2%9.7–18.5%3 months, 1,780 flights
Dec16.5%11.3–26.9%3 months, 1,987 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: LTN ↔ BUCHAREST-BANEASA, 8.3% of 109 movements. Highest disruption: LGW ↔ ROME-FIUMICINO, 42.4% of 224 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 optionLtn ↔ Bucharest-Baneasa8.3% of 109 flightsBhx ↔ Suceava9.1% of 77 flightsLtn ↔ Iasi9.4% of 650 flightsLgw ↔ Vienna34.2% of 234 flightsLgw ↔ Milan-Malpensa37.9% of 214 flightsLgw ↔ Rome-Fiumicino42.4% of 224 flights
All route comparisons and sample flags
RouteDisruptionCancellationsSample flag
LTN ↔ BUCHAREST-BANEASA8.3% of 109 movementsno events in 109 movementsdescriptive comparison
BHX ↔ SUCEAVA9.1% of 77 movements1.3% of 77 movementsdescriptive comparison
Luton ↔ Iasi9.4% of 650 movementsno events in 650 movementsdescriptive comparison
BHX ↔ SIBIU9.4% of 53 movementsno events in 53 movementsdescriptive comparison
GLA ↔ ROME-FIUMICINO10.8% of 93 movements1.1% of 93 movementsdescriptive comparison
LPL ↔ IASI10.9% of 147 movementsno events in 147 movementsdescriptive comparison
Luton ↔ Suceava11.2% of 276 movements0.7% of 276 movementsdescriptive comparison
LTN ↔ VIENNA12.1% of 141 movements1.4% of 141 movementsdescriptive comparison
LTN ↔ TIMISOARA13.8% of 349 movementsno events in 349 movementsdescriptive comparison
LTN ↔ CRAIOVA14.4% of 436 movements0.5% of 436 movementsdescriptive comparison
Luton ↔ Cluj Napoca14.8% of 610 movements0.2% of 610 movementsdescriptive comparison
LBA ↔ BUCHAREST-OTOPENI16.0% of 156 movements0.6% of 156 movementsdescriptive comparison
LPL ↔ BUCHAREST-OTOPENI16.8% of 143 movementsno events in 143 movementsdescriptive comparison
GLA ↔ MILAN-MALPENSA17.3% of 110 movementsno events in 110 movementsdescriptive comparison
LBA ↔ CLUJ-NAPOCA19.0% of 105 movements1.0% of 105 movementsdescriptive comparison
Birmingham ↔ Bucharest (Otopeni)19.6% of 276 movementsno events in 276 movementsdescriptive comparison
LTN ↔ SIBIU20.0% of 290 movements0.7% of 290 movementsdescriptive comparison
BHX ↔ CRAIOVA21.0% of 143 movements0.7% of 143 movementsdescriptive comparison
Luton ↔ Bucharest (Otopeni)23.9% of 1,397 movements0.2% of 1,397 movementsdescriptive comparison
LTN ↔ VENICE25.4% of 209 movementsno events in 209 movementsdescriptive comparison
Luton ↔ Rome (Fiumicino)27.7% of 512 movements0.6% of 512 movementsdescriptive comparison
Luton ↔ Milan (Malpensa)27.8% of 388 movements0.8% of 388 movementsdescriptive comparison
BHX ↔ ROME-FIUMICINO31.2% of 160 movementsno events in 160 movementsdescriptive comparison
LGW ↔ VIENNA34.2% of 234 movements0.4% of 234 movementsdescriptive comparison
Gatwick ↔ Milan (Malpensa)37.9% of 214 movements0.5% of 214 movementsdescriptive comparison
Gatwick ↔ Rome (Fiumicino)42.4% of 224 movementsno events in 224 movementsdescriptive comparison
LTN ↔ TIRGU-MURES7.5% of 40 movements — small sample, not rankedno events in 40 movements — small sample, not rankedsmall sample; not ranked
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?

6 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
Birmingham20.6% of 709 movementsdescriptive comparison
Glasgow14.3% of 203 movementsdescriptive comparison
Leeds Bradford17.9% of 263 movementsdescriptive comparison
Gatwick38.1% of 672 movementsdescriptive comparison
Liverpool (John Lennon)13.8% of 290 movementsdescriptive comparison
Luton18.8% of 5,408 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

20.4% of 7,549 movements arrivals were disrupted, against 32.1% of 7,563 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

0.6% of 7,549 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

Wizz Air Malta appears from Jun 2023 to Jun 2026 with 21,996 arrivals.

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

Archive route pairs: 55.

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?

20.4% of 7,549 movements over July 2025 to June 2026.

How often are they cancelled?

0.3% of 7,549 movements at short notice.

How late is late?

28.8–66.5 minutes; delayed denominator 1,512–3,238

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.