Cancellations on 20 Sept

1. 1 BOS Boston 5.2%of 618usually 2.3% 32
2. 2 IST Istanbul 2.7%of 811usually 3.3% 22
3. 3 ORD Chicago 1.2%of 1481usually 2.1% 18
4. 4 SYD Sydney 4.4%of 366usually 1.4% 16
5. 5 AMS Amsterdam 2.1%of 681usually 2.0% 14
6. 6 BNE Brisbane 3.5%of 283usually 3.7% 10
7. 7 YVR Vancouver 2.9%of 341usually 1.1% 10
8. 8 HND Tokyo 1.5%of 677usually 1.1% 10
9. 9 CAN Guangzhou 1.3%of 796usually 1.0% 10
10. 10 SFO San Francisco 0.5%of 1986usually 0.4% 10
11. 11 PEK Beijing 1.4%of 655usually 1.0% 9
12. 12 DEL New Delhi 0.6%of 1577usually 0.9% 9
13. 13 MAN Manchester 3.3%of 246usually 3.2% 8
14. 14 LIM Lima 2.8%of 290usually 2.3% 8
15. 15 MEL Melbourne 2.4%of 340usually 1.0% 8
16. 16 IAD Washington 2.0%of 407usually 1.9% 8
17. 17 SEA Seattle 1.2%of 666usually 0.8% 8
18. 18 YUL Montréal 2.6%of 272usually 1.9% 7
19. 19 EWR New York 1.3%of 528usually 0.6% 7
20. 20 FCO Rome 1.3%of 536usually 1.6% 7
21. 21 YYZ Toronto 1.3%of 531usually 1.7% 7
22. 22 MDZ Mendoza 30 departures seen 6
23. 23 LIN Milan 138 departures seen 6
24. 24 CNF Belo Horizonte 3.9%of 155usually 2.8% 6
25. 25 CUN Cancún 3.5%of 171usually 5.3% 6
26. 26 EBB Entebbe 61 departures seen 5
27. 27 FLL Fort Lauderdale 1.7%of 292usually 1.8% 5
28. 28 CPH Copenhagen 1.3%of 395usually 1.1% 5
29. 29 DCA Washington 1.1%of 452usually 1.1% 5
30. 30 DXB Dubai 1.0%of 511usually 1.1% 5
31. 31 IAH Houston 0.8%of 603usually 0.5% 5
32. 32 LHR London 0.8%of 660usually 4.9% 5
33. 33 LAX Los Angeles 0.7%of 757usually 0.9% 5
34. 34 BCN Barcelona 0.3%of 1500usually 2.2% 5
35. 35 AKL Auckland 1.9%of 209usually 0.6% 4
36. 36 CGH São Paulo 1.6%of 244usually 2.9% 4
37. 37 FUK Fukuoka 1.6%of 255usually 2.2% 4
38. 38 CDG Paris 0.6%of 663usually 0.9% 4
39. 39 MSP Minneapolis 0.6%of 654usually 0.3% 4
40. 40 NGS Nagasaki 38 departures seen 3

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 20 Sept: 464 cancelled of 52,973 tracked (0.9%) across 219 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.