Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
AS 21 · New York (JFK) → Seattle (SEA)
Sold by Alaska. Still flying: 55 of the last 56 days (Daily).
Arrives on time68%within 15 minutes, of 358 flights
Cancelled3.9%of scheduled flights
An hour or more late7%of flights that operated
When late, on average51 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 New York).
- Leaves JFK
- 07:00
- Arrives SEA
- 10:16
- Flight time
- 6h 16m
- Days flown, last 8 weeks
- 55 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 JFK
All flights leaving New York (JFK) at 7–8 am, wherever they’re going: 90% left within 15 minutes and 3.4% were cancelled (10,651 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.