Cancellations on 1 Aug

1. 1 YYC Calgary 17.4%of 265usually 2.3% 46
2. 2 YYZ Toronto 6.5%of 540usually 3.6% 35
3. 3 MIA Miami 4.8%of 662usually 1.9% 32
4. 4 IST Istanbul 2.7%of 807usually 3.7% 22
5. 5 SFO San Francisco 1.1%of 1920usually 1.5% 22
6. 6 BOS Boston 3.6%of 577usually 0.6% 21
7. 7 YUL Montréal 6.3%of 286usually 4.8% 18
8. 8 JED Jeddah 4.2%of 425usually 5.1% 18
9. 9 DEL New Delhi 1.1%of 1611usually 0.7% 18
10. 10 MSP Minneapolis 1.9%of 880usually 1.3% 17
11. 11 YVR Vancouver 4.5%of 359usually 1.7% 16
12. 12 BOM Mumbai 3.2%of 466usually 2.2% 15
13. 13 JFK New York 2.3%of 645usually 3.1% 15
14. 14 BCN Barcelona 1.0%of 1472usually 0.4% 14
15. 15 FRA Frankfurt am Main 1.7%of 726usually 1.2% 12
16. 16 DCA Washington 2.8%of 359usually 0.4% 10
17. 17 DXB Dubai 1.9%of 516usually 1.5% 10
18. 18 BOG Bogota 1.5%of 655usually 1.2% 10
19. 19 SEA Seattle 1.5%of 656usually 0.8% 10
20. 20 AEP Buenos Aires 4.7%of 192usually 3.3% 9
21. 21 AGP Málaga 2.3%of 391usually 0.7% 9
22. 22 AMS Amsterdam 1.5%of 620usually 1.5% 9
23. 23 YEG Edmonton 51 departures seen 8
24. 24 IAD Washington 2.0%of 391usually 0.6% 8
25. 25 SVO Moscow 1.8%of 436usually 1.4% 8
26. 26 PEK Beijing 1.1%of 698usually 2.0% 8
27. 27 PMI Palma de Mallorca 1.1%of 719usually 0.5% 8
28. 28 EWR New York 1.4%of 505usually 4.5% 7
29. 29 MCO Orlando 1.3%of 523usually 2.3% 7
30. 30 CAN Guangzhou 0.9%of 812usually 4.3% 7
31. 31 SVQ Seville 114 departures seen 5
32. 32 GDL Guadalajara 2.7%of 182usually 1.7% 5
33. 33 DUS Düsseldorf 2.2%of 224usually 0.6% 5
34. 34 CUN Cancún 2.0%of 248usually 1.5% 5
35. 35 MXP Milan 1.6%of 307usually 1.1% 5
36. 36 ATH Athens 1.2%of 411usually 0.8% 5
37. 37 MUC Munich 1.1%of 451usually 0.5% 5
38. 38 HND Tokyo 0.8%of 664usually 1.1% 5
39. 39 LHR London 0.8%of 649usually 1.0% 5
40. 40 LAX Los Angeles 0.7%of 743usually 1.3% 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.

Sat 1 Aug: 647 cancelled of 49,980 tracked (1.3%) across 170 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.