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Sion flight delays: the record, day by day

Eurocontrol attributes air-traffic delay to Sion on the days it happens, with the cause. On its 25 worst days since 2019 the airport lost 18,900 minutes of arrival delay, mostly to atc capacity and aerodrome capacity. Days with nothing logged are a strong point for any passenger whose flight was late for another reason.

Was your Sion flight 3 hours late?

The day the flight was due to leave, in local time where it left. For an overnight flight, that is the evening you set off.

Same flight number twice that day? Add the departure code

Free. No account. The airline is not contacted.

Worst days on record

DateDelay minLateCause
15 February 20252,59030ATC capacity
18 February 20241,77029Special event
23 February 20251,43027ATC capacity
22 February 20251,03328ATC capacity
22 February 202099713ATC capacity
14 February 202699014Aerodrome capacity
27 December 202590120Aerodrome capacity
21 February 202680314Aerodrome capacity
17 February 202479615Special event
18 February 202368817Aerodrome capacity
10 February 202468518ATC capacity
26 February 202268218Special event
20 February 202265712ATC capacity
27 February 202264120Special event
23 February 201961517Special event

Most recent days with delay logged

DateDelay minLateCause
22 March 2026572Aerodrome capacity
28 February 2026330ATC capacity
21 February 202680314Aerodrome capacity
14 February 202699014Aerodrome capacity
11 January 20262025ATC staffing
7 January 2026872ATC staffing
6 January 2026451ATC staffing
4 January 20263149ATC capacity
3 January 2026281ATC capacity
28 December 20252335Aerodrome capacity
27 December 202590120Aerodrome capacity
26 December 2025771ATC capacity
21 December 202550ATC capacity
20 December 2025260ATC capacity
9 November 2025160Aerodrome capacity

Data to 30 September 2026. Eurocontrol publishes about a month in arrears.

What usually goes wrong at Sion

ATC capacity54%
Aerodrome capacity24%
Special event19%
ATC equipment2%

Share of logged delay minutes across the worst and most recent days shown above. Weather, ATC staffing, ATC capacity and equipment failures are the causes airlines most often plead as extraordinary; airport capacity and unspecified delay are arguable.

Questions

Is a delay at Sion caused by weather always an extraordinary circumstance?

No. The airline must show that the weather actually affected your flight and that it took all reasonable measures. Eurocontrol logs weather delay at Sion on specific days; if your day is not one of them, the weather defence has nothing behind it. If it is, the airline still has to connect it to your flight.

How do I find out if my Sion flight was delayed 3 hours?

Enter the flight number and date in the checker above. It pulls the recorded arrival time, works out the delay against the schedule, and shows what Eurocontrol and the airport weather logged for Sion that day.

Which airlines' passengers can claim after a Sion delay?

Any airline departing Sion is covered by EU261 regardless of nationality. Arrivals are covered when the airline is a UK or EU carrier.

Source: Eurocontrol Performance Review Unit, airport arrival ATFM delay by cause, daily. See also your rights and the compensation calculator.