Cancellations on 4 Aug

1. 1 DEN Denver 4.3%of 1017usually 1.2% 44
2. 2 BOS Boston 5.6%of 609usually 2.1% 34
3. 3 IST Istanbul 3.7%of 787usually 3.5% 29
4. 4 JFK New York 4.0%of 646usually 4.1% 26
5. 5 BCN Barcelona 1.6%of 1489usually 0.3% 24
6. 6 PEK Beijing 2.7%of 702usually 2.1% 19
7. 7 DCA Washington 3.7%of 457usually 1.7% 17
8. 8 FRA Frankfurt am Main 2.2%of 695usually 1.4% 15
9. 9 DEL New Delhi 0.9%of 1549usually 0.7% 14
10. 10 BOM Mumbai 2.7%of 443usually 2.4% 12
11. 11 IAD Washington 2.7%of 402usually 0.9% 11
12. 12 LHR London 1.6%of 668usually 1.1% 11
13. 13 BNE Brisbane 3.7%of 273usually 2.9% 10
14. 14 YUL Montréal 3.1%of 288usually 4.4% 9
15. 15 DOH Doha 2.6%of 306usually 0.6% 8
16. 16 EWR New York 1.5%of 535usually 4.5% 8
17. 17 AMS Amsterdam 1.3%of 636usually 1.5% 8
18. 18 HND Tokyo 1.2%of 667usually 1.0% 8
19. 19 ATL Atlanta 0.7%of 1107usually 0.5% 8
20. 20 WAW Warsaw 2.4%of 295usually 1.0% 7
21. 21 LIM Lima 2.3%of 302usually 1.7% 7
22. 22 BNA Nashville 2.1%of 339usually 0.7% 7
23. 23 YVR Vancouver 1.9%of 371usually 2.9% 7
24. 24 YYZ Toronto 1.3%of 541usually 4.1% 7
25. 25 IAH Houston 1.1%of 615usually 0.9% 7
26. 26 PHX Phoenix 1.0%of 732usually 0.8% 7
27. 27 CPT Cape Town 3.7%of 164usually 0.4% 6
28. 28 CVG Cincinnati / Covington 3.4%of 178usually 1.4% 6
29. 29 AEP Buenos Aires 3.3%of 183usually 3.0% 6
30. 30 TPE Taipei 1.7%of 356usually 2.0% 6
31. 31 BOG Bogota 1.0%of 620usually 1.2% 6
32. 32 SEA Seattle 0.9%of 658usually 0.9% 6
33. 33 FLL Fort Lauderdale 1.8%of 275usually 1.2% 5
34. 34 ZRH Zurich 1.3%of 384usually 0.9% 5
35. 35 LGA New York 0.9%of 532usually 7.5% 5
36. 36 EZE Buenos Aires 101 departures seen 4
37. 37 GVA Geneva 123 departures seen 4
38. 38 LIN Milan 139 departures seen 4
39. 39 VLC Valencia 2.4%of 167usually 0.6% 4
40. 40 TPA Tampa 1.7%of 229usually 0.7% 4

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.

Tue 4 Aug: 613 cancelled of 55,840 tracked (1.1%) across 213 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.

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.