Flights Denver → Ontario
DEN → ONT
Route overview
The flight route from Denver to Ontario has a 76% on-time performance rate, with an average delay of 13.9 minutes per flight. Over the past year, this route has seen 576 total flights departing from Denver International Airport, which opened in 1989, heading towards Ontario International Airport, serving over 5.7 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 Denver (DEN) → Ontario (ONT) route is operated by United Airlines, Southwest Airlines. Across 805 flights monitored in recent months, 74% arrived on time (within 15 min of schedule), with an average delay of 16 minutes. The cancellation rate is 0.37%. FlightGuard's average computed risk is 23.1/100 (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 Denver the average ATFM delay is 2.0 minutes.
Heading to Ontario: what to expect in this direction
Flying from Denver (DEN) to Ontario (ONT) heads south-west for about 1,316 km, a flight time of roughly 2h 4m.
Departures from Denver on this leg cluster in the midday window: about 48% of DEN-ONT flights take off then.
Air-traffic congestion: departing Denver the average ATFM delay is 2.0 min (atfm); arriving into Ontario it is 2.0 min (airspace/NAS (BTS)).
Across 805 tracked DEN-ONT flights, 74% left on time with an average delay of 16 min and a 0.4% 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 DEN-ONT
Airports
Frequently asked questions about DEN-ONT
On the Denver (DEN) -> Ontario (ONT) route, on-time performance is 74% with an average delay of 16 minutes, based on 805 tracked flights.
The cancellation rate on Denver-Ontario is 0.37% 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 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.
