UK FLIGHT DELAY INDEX

derived from CAA punctuality statistics for UK reporting airports

How often are these flights late or cancelled?

Wideroe Flyveselskap A/S

In the twelve months from July 2025 to June 2026, 10.0% of 1,097 movements arriving into the UK were disrupted — more than fifteen minutes late or cancelled at short notice.

Put the other way round, 90.0% of 1,097 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

10.0% of 1,097 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
10.0% of 1,097 movements2.5% of 1,097 movements12.8–66.8 minutes; delayed denominator 83–350no events in 1,097 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?

no events in 1,097 movements passed the three-hour mark.

The ladder shows how many movements crossed each threshold. Cancellations are separate: 2.5% of 1,097 movements.

DelayShare and sampleOne event per movements
More than 15 minutes7.6% of 1,097 movements13.2
More than 30 minutes4.2% of 1,097 movements23.8
More than 60 minutes1.6% of 1,097 movements60.9
More than 120 minutes0.2% of 1,097 movements548.5
More than 180 minutesno events in 1,097 movementsNo observed events; this is not zero risk.
More than 360 minutesno events in 1,097 movementsNo observed events; this is not zero risk.
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?

0.2% of 1,097 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 early13011.9%15–1 early59053.8%0–15 late26724.3%16–30373.4%31–60282.6%61…120161.5%121…18020.2%181…36000.0%>36000.0%D=1,097
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: Aug 2020, 2.7% of 73 movements. Worst month: Dec 2022, 44.4% of 124 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: 23.4%; sample: 942018Feb 2018: 33.0%; sample: 88Mar 2018: 17.2%; sample: 87Apr 2018: 16.7%; sample: 96May 2018: 7.5%; sample: 93Jun 2018: 10.3%; sample: 87Jul 2018: 14.3%; sample: 77Aug 2018: 14.7%; sample: 109Sep 2018: 28.9%; sample: 114Oct 2018: 16.9%; sample: 130Nov 2018: 10.2%; sample: 128Dec 2018: 12.4%; sample: 105Jan 2019: 17.9%; sample: 1232019Feb 2019: 15.4%; sample: 117Mar 2019: 18.9%; sample: 127Apr 2019: 10.3%; sample: 117May 2019: 5.8%; sample: 121Jun 2019: 19.8%; sample: 126Jul 2019: 13.3%; sample: 113Aug 2019: 12.2%; sample: 139Sep 2019: 17.7%; sample: 158Oct 2019: 10.2%; sample: 166Nov 2019: 19.3%; sample: 150Dec 2019: 27.4%; sample: 135Jan 2020: 16.5%; sample: 1392020Feb 2020: 27.6%; sample: 134Mar 2020: 25.9%; sample: 27Apr 2020: 12.9%; sample: 31May 2020: 13.2%; sample: 38Jun 2020: 7.2%; sample: 69Jul 2020: 12.7%; sample: 55Aug 2020: 2.7%; sample: 73Sep 2020: 13.3%; sample: 83Oct 2020: 29.7%; sample: 64Nov 2020: 17.9%; sample: 39Dec 2020: 18.5%; sample: 27Jan 2021: 23.1%; sample: 262021Feb 2021: 8.7%; sample: 23Mar 2021: 7.4%; sample: 27Apr 2021: 8.3%; sample: 24May 2021: 0.0%; sample: 34Jun 2021: 11.5%; sample: 52Jul 2021: 20.4%; sample: 54Aug 2021: 11.6%; sample: 69Sep 2021: 13.8%; sample: 116Oct 2021: 38.3%; sample: 128Nov 2021: 32.6%; sample: 129Dec 2021: 30.5%; sample: 95Jan 2022: 28.6%; sample: 772022Feb 2022: 32.9%; sample: 82Mar 2022: 17.3%; sample: 110Apr 2022: 16.1%; sample: 112May 2022: 15.5%; sample: 129Jun 2022: 27.6%; sample: 123Jul 2022: 22.8%; sample: 92Aug 2022: 16.5%; sample: 121Sep 2022: 16.3%; sample: 141Oct 2022: 26.2%; sample: 141Nov 2022: 17.2%; sample: 134Dec 2022: 44.4%; sample: 124Jan 2023: 28.3%; sample: 1132023Feb 2023: 27.4%; sample: 117Mar 2023: 27.3%; sample: 128Apr 2023: 9.8%; sample: 92May 2023: 8.3%; sample: 109Jun 2023: 9.7%; sample: 103Jul 2023: 11.2%; sample: 89Aug 2023: 17.3%; sample: 104Sep 2023: 11.5%; sample: 113Oct 2023: 15.1%; sample: 119Nov 2023: 12.5%; sample: 104Dec 2023: 30.1%; sample: 93Jan 2024: 22.9%; sample: 962024Feb 2024: 24.0%; sample: 100Mar 2024: 20.8%; sample: 96Apr 2024: 25.7%; sample: 105May 2024: 14.1%; sample: 99Jun 2024: 16.5%; sample: 91Jul 2024: 9.6%; sample: 83Aug 2024: 13.4%; sample: 82Sep 2024: 18.2%; sample: 99Oct 2024: 15.5%; sample: 103Nov 2024: 20.6%; sample: 97Dec 2024: 25.3%; sample: 87Jan 2025: 25.6%; sample: 862025Feb 2025: 4.8%; sample: 84Mar 2025: 11.0%; sample: 100Apr 2025: 14.3%; sample: 91May 2025: 5.0%; sample: 101Jun 2025: 14.9%; sample: 94Jul 2025: 6.7%; sample: 75Aug 2025: 7.8%; sample: 90Sep 2025: 8.6%; sample: 105Oct 2025: 10.3%; sample: 97Nov 2025: 14.7%; sample: 95Dec 2025: 11.7%; sample: 94Jan 2026: 17.8%; sample: 902026Feb 2026: 6.0%; sample: 84Mar 2026: 13.0%; sample: 92Apr 2026: 12.6%; sample: 95May 2026: 6.2%; sample: 97Jun 2026: 3.6%; sample: 83Pandemic regime Jun 2020Summer 2022 breakdown Jul 2022NATS system failure Aug 2023Heathrow fire closure Mar 2025100%0%
Every monthly observation
MonthDisruption on arrivals
Jan 201823.4% of 94 movements
Feb 201833.0% of 88 movements
Mar 201817.2% of 87 movements
Apr 201816.7% of 96 movements
May 20187.5% of 93 movements
Jun 201810.3% of 87 movements
Jul 201814.3% of 77 movements
Aug 201814.7% of 109 movements
Sep 201828.9% of 114 movements
Oct 201816.9% of 130 movements
Nov 201810.2% of 128 movements
Dec 201812.4% of 105 movements
Jan 201917.9% of 123 movements
Feb 201915.4% of 117 movements
Mar 201918.9% of 127 movements
Apr 201910.3% of 117 movements
May 20195.8% of 121 movements
Jun 201919.8% of 126 movements
Jul 201913.3% of 113 movements
Aug 201912.2% of 139 movements
Sep 201917.7% of 158 movements
Oct 201910.2% of 166 movements
Nov 201919.3% of 150 movements
Dec 201927.4% of 135 movements
Jan 202016.5% of 139 movements
Feb 202027.6% of 134 movements
Mar 202025.9% of 27 movements — small sample, not ranked
Apr 202012.9% of 31 movements — small sample, not ranked
May 202013.2% of 38 movements — small sample, not ranked
Jun 20207.2% of 69 movements
Jul 202012.7% of 55 movements
Aug 20202.7% of 73 movements
Sep 202013.3% of 83 movements
Oct 202029.7% of 64 movements
Nov 202017.9% of 39 movements — small sample, not ranked
Dec 202018.5% of 27 movements — small sample, not ranked
Jan 202123.1% of 26 movements — small sample, not ranked
Feb 20218.7% of 23 movements — small sample, not ranked
Mar 20217.4% of 27 movements — small sample, not ranked
Apr 20218.3% of 24 movements — small sample, not ranked
May 2021no events in 34 movements — small sample, not ranked
Jun 202111.5% of 52 movements
Jul 202120.4% of 54 movements
Aug 202111.6% of 69 movements
Sep 202113.8% of 116 movements
Oct 202138.3% of 128 movements
Nov 202132.6% of 129 movements
Dec 202130.5% of 95 movements
Jan 202228.6% of 77 movements
Feb 202232.9% of 82 movements
Mar 202217.3% of 110 movements
Apr 202216.1% of 112 movements
May 202215.5% of 129 movements
Jun 202227.6% of 123 movements
Jul 202222.8% of 92 movements
Aug 202216.5% of 121 movements
Sep 202216.3% of 141 movements
Oct 202226.2% of 141 movements
Nov 202217.2% of 134 movements
Dec 202244.4% of 124 movements
Jan 202328.3% of 113 movements
Feb 202327.4% of 117 movements
Mar 202327.3% of 128 movements
Apr 20239.8% of 92 movements
May 20238.3% of 109 movements
Jun 20239.7% of 103 movements
Jul 202311.2% of 89 movements
Aug 202317.3% of 104 movements
Sep 202311.5% of 113 movements
Oct 202315.1% of 119 movements
Nov 202312.5% of 104 movements
Dec 202330.1% of 93 movements
Jan 202422.9% of 96 movements
Feb 202424.0% of 100 movements
Mar 202420.8% of 96 movements
Apr 202425.7% of 105 movements
May 202414.1% of 99 movements
Jun 202416.5% of 91 movements
Jul 20249.6% of 83 movements
Aug 202413.4% of 82 movements
Sep 202418.2% of 99 movements
Oct 202415.5% of 103 movements
Nov 202420.6% of 97 movements
Dec 202425.3% of 87 movements
Jan 202525.6% of 86 movements
Feb 20254.8% of 84 movements
Mar 202511.0% of 100 movements
Apr 202514.3% of 91 movements
May 20255.0% of 101 movements
Jun 202514.9% of 94 movements
Jul 20256.7% of 75 movements
Aug 20257.8% of 90 movements
Sep 20258.6% of 105 movements
Oct 202510.3% of 97 movements
Nov 202514.7% of 95 movements
Dec 202511.7% of 94 movements
Jan 202617.8% of 90 movements
Feb 20266.0% of 84 movements
Mar 202613.0% of 92 movements
Apr 202612.6% of 95 movements
May 20266.2% of 97 movements
Jun 20263.6% of 83 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 2020Arrivals7.2% of 69 movements18.0% across 1,356 flightsreturned the next month
Pandemic regime · Jun 2020Departures8.7% of 69 movements19.3% across 1,357 flightsreturned the next month
Summer 2022 breakdown · Jul 2022Arrivals22.8% of 92 movements23.8% across 1,224 flightsreturned the next month
Summer 2022 breakdown · Jul 2022Departures47.8% of 92 movements30.7% across 1,226 flightsreturned the next month
NATS system failure · Aug 2023Arrivals17.3% of 104 movements20.2% across 1,412 flightsreturned the next month
NATS system failure · Aug 2023Departures17.3% of 104 movements22.9% across 1,407 flightsreturned the next month
Heathrow fire closure · Mar 2025Arrivals11.0% of 100 movements17.5% across 1,112 flightsreturned the next month
Heathrow fire closure · Mar 2025Departures11.0% of 100 movements16.4% across 1,113 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: Dec, 26.3% across 6 months. Lowest median: May, 7.5% across 7 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 nJanFebMarAprMayJunJulAugSepOctNovDec201917.9% of 123 movements15.4% of 117 movements18.9% of 127 movements10.3% of 117 movements5.8% of 121 movements19.8% of 126 movements13.3% of 113 movements12.2% of 139 movements17.7% of 158 movements10.2% of 166 movements19.3% of 150 movements27.4% of 135 movements202016.5% of 139 movements27.6% of 134 movements25.9% of 27 movements †12.9% of 31 movements †13.2% of 38 movements †7.2% of 69 movements12.7% of 55 movements2.7% of 73 movements13.3% of 83 movements29.7% of 64 movements17.9% of 39 movements †18.5% of 27 movements †202123.1% of 26 movements †8.7% of 23 movements †7.4% of 27 movements †8.3% of 24 movements †no events in 34 movements †11.5% of 52 movements20.4% of 54 movements11.6% of 69 movements13.8% of 116 movements38.3% of 128 movements32.6% of 129 movements30.5% of 95 movements202228.6% of 77 movements32.9% of 82 movements17.3% of 110 movements16.1% of 112 movements15.5% of 129 movements27.6% of 123 movements22.8% of 92 movements16.5% of 121 movements16.3% of 141 movements26.2% of 141 movements17.2% of 134 movements44.4% of 124 movements202328.3% of 113 movements27.4% of 117 movements27.3% of 128 movements9.8% of 92 movements8.3% of 109 movements9.7% of 103 movements11.2% of 89 movements17.3% of 104 movements11.5% of 113 movements15.1% of 119 movements12.5% of 104 movements30.1% of 93 movements202422.9% of 96 movements24.0% of 100 movements20.8% of 96 movements25.7% of 105 movements14.1% of 99 movements16.5% of 91 movements9.6% of 83 movements13.4% of 82 movements18.2% of 99 movements15.5% of 103 movements20.6% of 97 movements25.3% of 87 movements202525.6% of 86 movements4.8% of 84 movements11.0% of 100 movements14.3% of 91 movements5.0% of 101 movements14.9% of 94 movements6.7% of 75 movements7.8% of 90 movements8.6% of 105 movements10.3% of 97 movements14.7% of 95 movements11.7% of 94 movements202617.8% of 90 movements6.0% of 84 movements13.0% of 92 movements12.6% of 95 movements6.2% of 97 movements3.6% of 83 movementsno datano datano datano datano datano data
Month-by-month table: median, observed range and sample
MonthMedianObserved rangeSample
Jan23.4%17.8–28.6%7 months, 679 flights
Feb24.0%4.8–33.0%7 months, 672 flights
Mar17.3%11.0–27.3%7 months, 740 flights
Apr14.3%9.8–25.7%7 months, 708 flights
May7.5%5.0–15.5%7 months, 749 flights
Jun14.9%3.6–27.6%7 months, 707 flights
Jul12.3%6.7–22.8%6 months, 529 flights
Aug14.0%7.8–17.3%6 months, 645 flights
Sep17.0%8.6–28.9%6 months, 730 flights
Oct15.3%10.2–26.2%6 months, 756 flights
Nov16.0%10.2–20.6%6 months, 708 flights
Dec26.3%11.7–44.4%6 months, 638 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: ABZ ↔ STAVANGER, 8.8% of 464 movements. Highest disruption: ABZ ↔ BERGEN, 10.6% of 631 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 optionAbz ↔ Stavanger8.8% of 464 flightsAbz ↔ Bergen10.6% of 631 flights
All route comparisons and sample flags
RouteDisruptionCancellationsSample flag
Aberdeen ↔ Stavanger8.8% of 464 movements3.4% of 464 movementsdescriptive comparison
Aberdeen ↔ Bergen10.6% of 631 movements1.7% of 631 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?

1 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
Aberdeen9.9% of 1,096 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

10.0% of 1,097 movements arrivals were disrupted, against 9.9% of 1,096 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

no events in 1,097 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

Wideroe Flyveselskap A/S appears from Jan 2018 to Jun 2026 with 9,817 arrivals.

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

Archive route pairs: 35.

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?

10.0% of 1,097 movements over July 2025 to June 2026.

How often are they cancelled?

2.5% of 1,097 movements at short notice.

How late is late?

12.8–66.8 minutes; delayed denominator 83–350

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.