Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
AS 305 · Miami (MIA) → Seattle (SEA)
Sold by Alaska. Still flying: 56 of the last 56 days (Daily).
Arrives on time69%within 15 minutes, of 257 flights
Cancelled1.2%of scheduled flights
An hour or more late7%of flights that operated
When late, on average50 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 Miami).
- Leaves MIA
- 18:20
- Arrives SEA
- 22:00
- Flight time
- 6h 40m
- Days flown, last 8 weeks
- 56 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 MIA
All flights leaving Miami (MIA) at 6–7 pm, wherever they’re going: 66% left within 15 minutes and 2.5% were cancelled (6,510 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.