About 1 in 5 AS 737 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (19%); 0.4% were cancelled. The typical flight landed 7 minutes early.
AS 737: SEA → IAD
Scheduled to leave Seattle at 9:13 a.m. local time. Over the past year it arrived on time 81% of the time (237 flights), in line with other AS flights on the route at that hour (82%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 34 | 79% |
| Tuesday | 33 | 82% |
| Wednesday | 34 | 82% |
| Thursday | 34 | 79% |
| Friday | 34 | 82% |
| Saturday | 34 | 79% |
| Sunday | 34 | 85% |
Why it was late
All flights SEA → IAD · Connecting off AS 737? Check the risk
AS 737: IAD → SEA
Scheduled to leave Washington at 6:14 p.m. local time. Over the past year it arrived on time 57% of the time (160 flights), worse than other AS flights on the route at that hour (63%). Last seen in the data Aug 31, 2026.
Usually Alaska Airlines's last flight of the day from Washington to Seattle (100% of days). Alaska Airlines's last IAD–SEA flight was cancelled 2.0% of the time, against 0.6% for its earlier ones. If it's cancelled, the next Alaska Airlines flight is usually around 6:03 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 24 | 58% |
| Tuesday | 20 | 45% |
| Wednesday | 24 | 58% |
| Thursday | 24 | 54% |
| Friday | 24 | 63% |
| Saturday | 20 | 65% |
| Sunday | 24 | 58% |
Why it was late
All flights IAD → SEA · Connecting off AS 737? Check the risk
Questions
How often is AS 737 from SEA to IAD late?
Alaska Airlines 737 from Seattle, WA to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 19% of 237 scheduled flights between September 2025 and August 2026. 0.4% were cancelled.
How often is AS 737 from IAD to SEA late?
Alaska Airlines 737 from Washington, DC to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 43% of 160 scheduled flights between September 2025 and August 2026. 1.3% 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.