Flights San Francisco → Ontario
SFO → ONT
Route overview
The flight route from San Francisco to Ontario has a high on-time performance rate of 86%, with an average delay of only 5.8 minutes. Over the course of a year, this route sees 307 flights serving the busy Ontario International Airport, which handles nearly 5.74 million passengers annually.
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 San Francisco (SFO) → Ontario (ONT) route is operated by United Airlines. Across 406 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 0.25%. FlightGuard's average computed risk is 20.5/100 (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 San Francisco the average ATFM delay is 2.0 minutes.
Heading to Ontario: what to expect in this direction
Flying from San Francisco (SFO) to Ontario (ONT) heads south-east for about 585 km, a flight time of roughly 1h 9m.
Departures from San Francisco on this leg cluster in the overnight window: about 42% of SFO-ONT flights take off then.
Air-traffic congestion: departing San Francisco the average ATFM delay is 2.0 min (atfm); arriving into Ontario it is 2.0 min (airspace/NAS (BTS)).
Across 406 tracked SFO-ONT flights, 85% left on time with an average delay of 6 min and a 0.3% 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) | 74% | 10 min | 6.9% |
Airlines operating SFO-ONT
Airports
Frequently asked questions about SFO-ONT
On the San Francisco (SFO) -> Ontario (ONT) route, on-time performance is 85% with an average delay of 6 minutes, based on 406 tracked flights.
The cancellation rate on San Francisco-Ontario is 0.25% across 406 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 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.
