Direct flights from Ontario to Denver
All flights from ONT to DEN non-stop. There are direct flights from Ontario International Airport (ONT), California, USA to Denver International (DEN), Colorado, USA with Southwest Airlines, Frontier Airlines and United Airlines. 53 weekly departures are currently scheduled on this route. Departure times range from 05:00 to 21:28 depending on the schedule period. The flight distance is 822 miles (1323 km). Flight time ranges from 2 hours and 10 minutes to 2 hours and 26 minutes.
Ontario
, USA
Airlines with non-stop routes:
Southwest Airlines
Frontier Airlines
United Airlines
Flight schedule from Ontario to Denver with Southwest Airlines
This is a weekly direct flight schedule for Southwest Airlines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.
Flight
The timetable & schedule information was updated at 2026-08-17
Flight schedule from Ontario to Denver with Frontier Airlines
This is a weekly direct flight schedule for Frontier Airlines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.
Flight
The timetable & schedule information was updated at 2026-08-17
Flight schedule from Ontario to Denver with United Airlines
This is a weekly direct flight schedule for United Airlines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.
Flight
The timetable & schedule information was updated at 2026-08-17
Ontario to Denver scheduled departures
Select a date to see every published non-stop departure between ONT and DEN.
ONT - DEN route facts
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Distance822 miles (1323 km)
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Flight time2 hours and 10 minutes to 2 hours and 26 minutes
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Airlines Southwest Frontier United
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Airline alliancesLow-cost carrier Star Alliance
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CabinsEconomy Business First
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Hub airportsUnited Airlines: DEN
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Departure terminalsSouthwest Airlines: Terminal 4United Airlines: Terminal 2
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AircraftSouthwest Airlines: Boeing 737MAX 8 Passenger, Boeing 737-800 (winglets) Passenger/BBJ2 and Boeing 737-700 Passenger (Scimitar Winglets)Frontier Airlines: Airbus A320neo, Airbus A320, Airbus A321neo and Airbus A321United Airlines: Boeing 737-800 Passenger, Airbus A319, Boeing 737MAX 9 Passenger, Boeing 737-900 Passenger and Airbus A320
Route FAQ
Nearby airports that offer flights to Denver (DEN)
From (AUS)
110 flights per week
From (IND)
47 flights per week
From (XWA)
26 flights per week
From (MEX)
21 flights per week
From (DIK)
12 flights per week
