OntarioSeattleDirect FlightsONT–SEA
Ontario (Ontario International Airport) to Seattle (Seattle-Tacoma International Airport).
Flight time from ONT to SEA is estimated at about 2h 34m, based on the 957-mile great-circle distance. Our current captured departure sample includes 8-9/day across 4 captured airlines, with Alaska Airlines appearing most often in that sample. Captured departure times run from 00:16 to 23:36 local time.
Plan this routeAt a glance
| Est. flight time | Distance | Captured freq. | Type |
|---|---|---|---|
| ~2h 34m Estimated from great-circle distance — no tracked flights yet. | 957 mi | 8-9/day From the current provider sample; confirm live timetables before booking. | Domestic |
Airlines on this route
Captured airlines for ONT to SEA
Our current provider sample includes 8-9/day from ONT to SEA across 4 captured airlines. Captured departure terminal data is available for 2.
- First departure
- 00:16
- Last departure
- 23:36
- Cadence
- ~every 2 hours
- Captured departures/day
- 19
| Airline | Captured daily freq. | Aircraft | Departures (local) |
|---|---|---|---|
| Alaska Airlines | 4-5/day | Boeing 737, Airbus A330 · Terminal 2 · Seat map | 06:00 |
Aircraft on this route
Flying the other way?
SEA to ONT flights — 8-9/day on 4 airlines →Methodology: airline, aircraft, terminal, and departure-time details come from the rolling scheduled-departures window for ONT to SEA, last seen June 15, 2026. Frequency uses 60 scheduled departures across 7 observed days; flight time is estimated from great-circle distance until this route has enough tracked flights for an observed average. Provider coverage can miss operators on some routes, so confirm live timetables before booking.
Route FAQ
How long is the flight from ONT to SEA?
The ONT to SEA flight time is estimated at about 2h 34m from great-circle distance until enough tracked flights are available.
How far is ONT from SEA?
ONT to SEA is about 957 miles by air.
Which airlines fly from ONT to SEA?
Our current provider sample for ONT to SEA includes Alaska Airlines, Delta Air Lines, Frontier Airlines, ATI. Confirm live timetables before booking.
What aircraft fly from ONT to SEA?
Aircraft captured in our current provider sample for ONT to SEA include Airbus A320 family, Boeing 737, Airbus A330, Boeing 767, Embraer E-Jet.