Flights Ontario → San Francisco
ONT → SFO
How long is the flight from Ontario to San Francisco?
The flight from Ontario (ONT) to San Francisco (SFO) takes 59 min on average. That is the median time recorded across 2 scheduled flights on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
Route overview
The flight route from Ontario to San Francisco has an on-time performance rate of 80%, with flights typically experiencing a mean delay of 9.5 minutes. Over the course of a year, this route sees approximately 306 flights, serving one of the busiest airports in terms of annual passenger traffic at nearly 50 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) → San Francisco (SFO) route is operated by United Airlines. Across 798 flights monitored in recent months, 67% arrived on time (within 15 min of schedule), with an average delay of 18 minutes. The cancellation rate is 0.63%. FlightGuard's average computed risk is 27.8/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At San Francisco the average ATFM delay is 5.5 minutes (main cause: atfm). Departing from Ontario the average ATFM delay is 5.5 minutes.
Heading to San Francisco: what to expect in this direction
Flying from Ontario (ONT) to San Francisco (SFO) heads north-west for about 585 km, a flight time of roughly 59m.
Departures from Ontario on this leg cluster in the morning window: about 47% of ONT-SFO flights take off then.
Air-traffic congestion: departing Ontario the average ATFM delay is 5.5 min (atfm); arriving into San Francisco it is 5.5 min (atfm).
Across 798 tracked ONT-SFO flights, 67% left on time with an average delay of 18 min and a 0.6% cancellation rate.
Route facts
Flights on this route
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Airline punctuality on this route
| Airline | On-time | Average delay | Cancellations |
|---|---|---|---|
| United Airlines (UA) | 83% | 5 min | 1.3% |
Airlines operating ONT-SFO
Airports
Frequently asked questions about ONT-SFO
The flight from Ontario (ONT) to San Francisco (SFO) takes 59 min on average. That is the median time recorded across 2 scheduled flights on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
On the Ontario (ONT) -> San Francisco (SFO) route, on-time performance is 67% with an average delay of 18 minutes, based on 798 tracked flights.
The cancellation rate on Ontario-San Francisco is 0.63% across 798 monitored flights.
The route is operated by 1 airline: United Airlines.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at San Francisco, 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.
