Cheap Flights from Ontario, CA to Denver, CO from $37
On Cheapflightsplus.com you will find 10 direct and 209 connecting flights from Ontario to Denver. You can compare airfare deals from 4 airlines and multiple travel sites from $37, book and save on cheap plane tickets and last minute offers. Also check out ONT-DEN flight schedule to find best flight time, convenient departure and arrival airports.
Flight Information
Below we will explain in detail what the flights cost on the destination from Ontario to Denver depends on and how to choose the most interesting flight option for you.
Distance between Ontario and Denver is 1316 miles. Time difference between the cities is 1h. Airplanes depart 00:59 to 21:41 from 2 Ontario airports and arrive 00:59 to 21:41 to 2 Denver airports. Average flight time is 2h 17m.
- The fastest flight 2h 16m
- Average flight time 2h 17m
- The earliest flight 00:59
- The latest flight 21:41
- Distance 818 ml
Best Flights from Ontario to Denver Today
| Price | Departure | Arrival | Flight Duration | Airline | Flight |
|---|---|---|---|---|---|
| from $37 | 00:59 Ontario Ontario Int. | 04:17 Denver Denver International | 2h 18m | Frontier Airlines | F91500 |
| from $49 | 17:21 Ontario Ontario Int. | 20:42 Denver Denver International | 2h 21m | Frontier Airlines | F92908 |
| from $106 | 13:15 Ontario Ontario Int. | 16:31 Denver Denver International | 2h 16m | United Airlines | UA1417 |
| from $69 | 17:15 Ontario Ontario Int. | 22:45 Denver Denver International | 4h 30m layover 1h 12m - Las Vegas | Frontier Airlines | F91358 F94612 |
| from $86 | 06:00 Ontario Ontario Int. | 12:06 Denver Denver International | 5h 6m layover 1h 45m - Las Vegas | Frontier Airlines | F92232 F92016 |
The cheapest months to travel to Denver are october (from 37 $), november (from 37 $), may (from 49 $).
The most expensive months are august (from 91 $), september (from 89 $), july (from 78 $).
What is the lowest airfare Ontario to Denver?
The cheapest plane ticket found by our users is $37. This airfare is for economy class on one-way F91500 flight by Frontier Airlines for October 21, 2025 which leaves Ontario Int. in Ontario at 00:59 am and arrives at Denver Denver International at 04:17.
Flight Schedule Ontario (California) to Denver (Colorado)
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Popular Airlines on the Route
The flight Ontario — Denver is served by 4 regular airlines and 1 low-cost airline. Most of the flights on this route are operated by Alaska Airlines - 68 departures per week at the price of from $ 121 . And the most expensive tickets are offered by Hawaiian Airlines airline - from $ 673.
Direct flights
There are 10 nonstop flights on the route. The fastest direct flight is UA1417 by United Airlines takes 2h 16m and the cheapest is F91500 by Frontier Airlines for $37.
- F9 - Frontier Airlinesfrom $37Find
- UA - United Airlinesfrom $106Find
Connecting Flights
There are 209 flights with layovers on the route. The fastest connecting flight is F91358 by Frontier Airlines takes 4h 30m and the cheapest is F91500 by Frontier Airlines for $69.
- AS - Alaska Airlinesfrom $121Find
- F9 - Frontier Airlinesfrom $69Find
- HA - Hawaiian Airlinesfrom $113Find
- UA - United Airlinesfrom $176Find
Airports
You can fly from Ontario to Denver from 2 airports (Ontario Int., International Heliport).
Ontario airports
- Ontario Int.-ONTfrom $37Find
- International Heliport-JIOFind
Denver airports
- Denver International-DENFind
- Arapahoe Co-APAFind
Airplanes
There are flights to Denver from Ontario by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.
Top Domestic Destinations from Ontario
You may also consider searching for discounted plane tickets to some other popular places from Ontario within United States.
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Top International Destinations from Ontario
Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.
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How to book a plane ticket yourself?
- Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
- Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
- Click «Buy» when you are ready — our system will redirect you to the site that sells the selected flight ticket.
- Fill in all passenger and payment information — passport and contact information, please double check all passengers’ names and make a payment for your itinerary.
- That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.
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