About 1 in 9 AS 473 flights from St. Louis arrived 15+ minutes late, diverted or cancelled over the past year (11%); 0.6% were cancelled. The typical flight landed 11 minutes early.
AS 473: STL → SEA
Scheduled to leave St. Louis at 7:00 a.m. local time. Over the past year it arrived on time 89% of the time (321 flights), worse than other AS flights on the route at that hour (93%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 48 | 88% |
| Tuesday | 47 | 87% |
| Wednesday | 46 | 89% |
| Thursday | 46 | 93% |
| Friday | 47 | 89% |
| Saturday | 40 | 88% |
| Sunday | 47 | 91% |
Why it was late
All flights STL → SEA · Connecting off AS 473? Check the risk
Questions
How often is AS 473 from STL to SEA late?
Alaska Airlines 473 from St. Louis, MO to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 11% of 321 scheduled flights between September 2025 and August 2026. 0.6% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Alaska Airlines for today's flight. Method.