Flights Ontario → Seattle
ONT → SEA
Route overview
The flight route from Ontario to Seattle features a high on-time performance rate of 91%, with an average delay of just 2 minutes. The route sees approximately 512 flights annually, operated primarily by Boeing 737 and Boeing 737-400 aircraft, serving the busy destination airport which handles over 52 million passengers per year.
Your rights on this US flight (DOT)
US flights have no statutory cash compensation for delays. Under the US DOT rules, if your flight is cancelled or significantly changed and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Amenities for controllable delays depend on each airline's contract of carriage.
US flight refund rules & checker →General information, not legal advice.
The Ontario (ONT) → Seattle (SEA) route is operated by American Airlines, Alaska Airlines. Across 655 flights monitored in recent months, 91% arrived on time (within 15 min of schedule), with an average delay of 2 minutes. The cancellation rate is 3.21%. FlightGuard's average computed risk is 17.6/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At Seattle the average ATFM delay is 2.0 minutes (main cause: atfm). Departing from Ontario the average ATFM delay is 2.0 minutes.
Heading to Seattle: what to expect in this direction
Flying from Ontario (ONT) to Seattle (SEA) heads north for about 1,540 km, a flight time of roughly 2h 21m.
Departures from Ontario on this leg cluster in the overnight window: about 59% of ONT-SEA flights take off then.
Air-traffic congestion: departing Ontario the average ATFM delay is 2.0 min (airspace/NAS (BTS)); arriving into Seattle it is 2.0 min (atfm).
Across 655 tracked ONT-SEA flights, 91% left on time with an average delay of 2 min and a 3.2% cancellation rate.
Route facts
Flights on this route
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Airline punctuality on this route
| Airline | On-time | Average delay | Cancellations |
|---|---|---|---|
| American Airlines (AA) | 74% | 16 min | 3.0% |
| Alaska Airlines (AS) | 67% | 10 min | 11.9% |
Airlines operating ONT-SEA
Airports
Frequently asked questions about ONT-SEA
On the Ontario (ONT) -> Seattle (SEA) route, on-time performance is 91% with an average delay of 2 minutes, based on 655 tracked flights.
The cancellation rate on Ontario-Seattle is 3.21% across 655 monitored flights.
The route is operated by 2 airlines: American Airlines, Alaska Airlines.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at Seattle, ATC delays, strikes, NOTAMs, fuel, airline punctuality and recent trends.
US flights have no statutory cash compensation for delays. Under US DOT rules, if the airline cancels or significantly changes your flight and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Meals or hotels for controllable delays depend on each airline's contract of carriage.
