Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
AS 489 · Seattle (SEA) → Ontario (ONT)
Sold by Alaska. Still flying: 48 of the last 56 days (Daily).
Arrives on time71%within 15 minutes, of 197 flights
Cancelled0.5%of scheduled flights
An hour or more late6%of flights that operated
When late, on average43 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport.
- Leaves SEA
- 20:33
- Arrives ONT
- 23:11
- Flight time
- 2h 38m
- Days flown, last 8 weeks
- 48 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 SEA
All flights leaving Seattle (SEA) at 8–9 pm, wherever they’re going: 74% left within 15 minutes and 0.8% were cancelled (6,401 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.