Flights Seattle → Ontario
SEA → ONT
Route overview
The flight route from Seattle to Ontario operates with a high level of punctuality, with 87% of flights arriving on time. Over the course of a year, an average of 512 flights are conducted using Boeing 737 and Boeing 737-400 aircraft, experiencing a mean delay of just 3.8 minutes.
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 Seattle (SEA) → Ontario (ONT) route is operated by American Airlines, Alaska Airlines. Across 655 flights monitored in recent months, 85% arrived on time (within 15 min of schedule), with an average delay of 6 minutes. The cancellation rate is 2.75%. FlightGuard's average computed risk is 20.7/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At Ontario the average ATFM delay is 2.0 minutes (main cause: airspace/NAS (BTS)). Departing from Seattle the average ATFM delay is 2.0 minutes.
Heading to Ontario: what to expect in this direction
Flying from Seattle (SEA) to Ontario (ONT) heads south for about 1,540 km, a flight time of roughly 2h 21m.
Departures from Seattle on this leg cluster in the overnight window: about 47% of SEA-ONT flights take off then.
Air-traffic congestion: departing Seattle the average ATFM delay is 2.0 min (atfm); arriving into Ontario it is 2.0 min (airspace/NAS (BTS)).
Across 655 tracked SEA-ONT flights, 85% left on time with an average delay of 6 min and a 2.8% 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 SEA-ONT
Airports
Frequently asked questions about SEA-ONT
On the Seattle (SEA) -> Ontario (ONT) route, on-time performance is 85% with an average delay of 6 minutes, based on 655 tracked flights.
The cancellation rate on Seattle-Ontario is 2.75% 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 Ontario, 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.
