About 1 in 6 AS 4 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (16%); 0.3% were cancelled. The typical flight landed 18 minutes early.
AS 4: SEA → DCA
Scheduled to leave Seattle at 8:00 a.m. local time. Over the past year it arrived on time 84% of the time (364 flights), in line with other AS flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 77% |
| Tuesday | 52 | 83% |
| Wednesday | 52 | 96% |
| Thursday | 52 | 79% |
| Friday | 52 | 83% |
| Saturday | 51 | 92% |
| Sunday | 52 | 79% |
Why it was late
Questions
How often is AS 4 from SEA to DCA late?
Alaska Airlines 4 from Seattle, WA to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 16% of 364 scheduled flights between September 2025 and August 2026. 0.3% 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.