Cancellations on 27 Sept

1. 1 BOS Boston 29.7%of 609usually 6.8% 181
2. 2 ORD Chicago 3.0%of 1453usually 2.4% 44
3. 3 LGA New York 6.5%of 538usually 1.4% 35
4. 4 IST Istanbul 3.9%of 811usually 3.7% 32
5. 5 MEL Melbourne 7.0%of 400usually 1.9% 28
6. 6 FCO Rome 2.9%of 549usually 1.3% 16
7. 7 CNF Belo Horizonte 9.4%of 159usually 5.2% 15
8. 8 SFO San Francisco 0.7%of 2029usually 0.5% 15
9. 9 BNE Brisbane 4.9%of 286usually 3.5% 14
10. 10 SYD Sydney 3.6%of 388usually 1.9% 14
11. 11 BOM Mumbai 3.3%of 428usually 1.8% 14
12. 12 DEL New Delhi 0.8%of 1600usually 0.9% 13
13. 13 WLG Wellington 103 departures seen 12
14. 14 OKA Naha 6.1%of 196usually 1.6% 12
15. 15 YYZ Toronto 2.2%of 535usually 1.9% 12
16. 16 CPH Copenhagen 2.8%of 393usually 0.9% 11
17. 17 ATH Athens 2.5%of 448usually 0.4% 11
18. 18 DXB Dubai 2.1%of 513usually 1.4% 11
19. 19 CDG Paris 1.7%of 661usually 0.7% 11
20. 20 AMS Amsterdam 1.6%of 683usually 1.9% 11
21. 21 MXP Milan 3.0%of 329usually 1.1% 10
22. 22 JFK New York 1.7%of 586usually 0.7% 10
23. 23 FUK Fukuoka 3.1%of 255usually 3.0% 8
24. 24 CAN Guangzhou 1.0%of 772usually 0.6% 8
25. 25 BCN Barcelona 0.5%of 1488usually 1.2% 8
26. 26 CUN Cancún 4.1%of 172usually 4.7% 7
27. 27 CGH São Paulo 2.9%of 244usually 3.4% 7
28. 28 YUL Montréal 2.7%of 262usually 1.9% 7
29. 29 HND Tokyo 1.0%of 671usually 3.2% 7
30. 30 HPN White Plains 60 departures seen 6
31. 31 CHC Christchurch 90 departures seen 6
32. 32 NRT Tokyo 1.8%of 332usually 3.4% 6
33. 33 IAD Washington 1.5%of 394usually 1.6% 6
34. 34 KUL Kuala Lumpur 1.5%of 398usually 1.1% 6
35. 35 ZRH Zurich 1.5%of 392usually 0.7% 6
36. 36 MCO Orlando 1.4%of 441usually 0.6% 6
37. 37 PEK Beijing 0.9%of 645usually 1.2% 6
38. 38 FRA Frankfurt am Main 0.8%of 731usually 0.6% 6
39. 39 ADL Adelaide 124 departures seen 5
40. 40 YVR Vancouver 1.5%of 335usually 2.1% 5

Ranked by cancelled departures on each airport's own board that day. Orange marks a cancellation rate at least double what that airport usually runs over the past fortnight.

Sun 27 Sept: 856 cancelled of 51,430 tracked (1.7%) across 205 airports

Each bar is one completed day across every airport board that published cancellations that day. Tap a bar for that day's full ranking. The set of counted airports shifts as boards change behaviour, so read the rate alongside the raw count; a gap means we have no usable record for that day. The outlined bar is the day you are viewing. Showing the most recent 90 days; the full series is in the JSON feed.

Some airport boards remove cancelled flights instead of labelling them, so there is no cancellation figure to read at these airports. The busiest of them:

A handful of other boards label routine schedule padding as cancelled, and do so to 15 to 27% of departures every day. Those airports are left out too.