Flights Ontario → Denver
ONT → DEN
Route overview
The flight route from Ontario to Denver has an on-time performance rate of 82%, with flights typically experiencing a mean delay of 8.9 minutes. The destination airport, which opened in 1989, serves over 82 million passengers annually, making it one of the busiest airports in the United States.
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) → Denver (DEN) route is operated by United Airlines, Southwest Airlines. Across 805 flights monitored in recent months, 83% arrived on time (within 15 min of schedule), with an average delay of 8 minutes. The cancellation rate is 1.12%. FlightGuard's average computed risk is 17.1/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At Denver the average ATFM delay is 2.0 minutes (main cause: atfm). Departing from Ontario the average ATFM delay is 2.0 minutes.
Heading to Denver: what to expect in this direction
Flying from Ontario (ONT) to Denver (DEN) heads north-east for about 1,316 km, a flight time of roughly 2h 4m.
Departures from Ontario on this leg cluster in the morning window: about 38% of ONT-DEN flights take off then.
Air-traffic congestion: departing Ontario the average ATFM delay is 2.0 min (airspace/NAS (BTS)); arriving into Denver it is 2.0 min (atfm).
Across 805 tracked ONT-DEN flights, 83% left on time with an average delay of 8 min and a 1.1% 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% |
| Southwest Airlines (WN) | 73% | 6 min | 3.1% |
Airlines operating ONT-DEN
Airports
Frequently asked questions about ONT-DEN
On the Ontario (ONT) -> Denver (DEN) route, on-time performance is 83% with an average delay of 8 minutes, based on 805 tracked flights.
The cancellation rate on Ontario-Denver is 1.12% across 805 monitored flights.
The route is operated by 2 airlines: United Airlines, Southwest Airlines.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at Denver, 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.
