Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
AS 306 · Boston (BOS) → Seattle (SEA)
Sold by Alaska. Still flying: 4 of the last 56 days.
Arrives on time60%within 15 minutes, of 116 flights
Cancelled1.7%of scheduled flights
An hour or more late8%of flights that operated
When late, on average48 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Seattle is 3 h behind Boston).
- Leaves BOS
- 19:11
- Arrives SEA
- 22:27
- Flight time
- 6h 16m
- Days flown, last 8 weeks
- 4 of 56
Each square is a day, Sat Jun 6 to Fri Jul 31, two weeks per row (each column is the same weekday); filled = flew.
How late it arrives
Share of flights that operated arriving more than this late.
Horizontal: minutes late at arrival (0 to 3 hours). Vertical: share of flights later than that.
Its hour at BOS
All flights leaving Boston (BOS) at 7–8 pm, wherever they’re going: 58% left within 15 minutes and 4.3% were cancelled (7,875 flights in the year). Other Alaska flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.