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Cheap flights from Ontario to Denver from $34

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Denver departing on 5/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags
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Mon 4/22
Mon 4/29

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Easily compare round-trip flights from Ontario to Denver

Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Ontario to Denver by changing tabs
Frontier
May 6
ONT12:59 amOntario
2h 24m
DEN4:23 amDenver Intl
May 8
DEN10:35 pmDenver Intl
2h 24m
ONT11:59 pmOntario
Frontier
May 19
ONT12:59 amOntario
2h 21m
DEN4:20 amDenver Intl
May 22
DEN12:10 pmDenver Intl
2h 24m
ONT1:34 pmOntario
Frontier
May 7
ONT12:59 amOntario
2h 24m
DEN4:23 amDenver Intl
May 8
DEN10:35 pmDenver Intl
2h 24m
ONT11:59 pmOntario
Frontier
May 8
ONT7:26 amOntario
2h 20m
DEN10:46 amDenver Intl
May 15
DEN5:01 amDenver Intl
2h 25m
ONT6:26 amOntario
Frontier
May 14
ONT12:59 amOntario
2h 24m
DEN4:23 amDenver Intl
May 17
DEN10:37 pmDenver Intl
2h 22m
ONT11:59 pmOntario
Frontier
Apr 29
ONT12:59 amOntario
2h 24m
DEN4:23 amDenver Intl
May 4
DEN5:01 amDenver Intl
2h 25m
ONT6:26 amOntario

Find the cheapest one-way flights from Ontario to Denver

If you're looking for one-way flights from Ontario to Denver, view some of our deals below provided by Frontier and United Airlines
Frontier
May 17
ONT8:56 pmOntario
2h 28m
DEN12:24 amDenver Intl
Frontier
May 19
ONT12:59 amOntario
2h 21m
DEN4:20 amDenver Intl
Multiple Airlines
Apr 28
ONT8:53 pmOntario
34h 51m
2 stops
DEN8:44 amDenver Intl

Search last-minute flights to Denver from Ontario

Find and compare round-trip flight prices for your last-minute flight from Ontario to Denver
Frontier
Apr 26
ONT12:55 amOntario
2h 24m
DEN4:19 amDenver Intl
May 1
DEN10:35 pmDenver Intl
2h 24m
ONT11:59 pmOntario
Frontier
Apr 26
ONT12:55 amOntario
2h 24m
DEN4:19 amDenver Intl
Apr 30
DEN5:01 amDenver Intl
2h 25m
ONT6:26 amOntario
Frontier
Apr 22
ONT12:59 amOntario
2h 24m
DEN4:23 amDenver Intl
Apr 30
DEN5:01 amDenver Intl
2h 25m
ONT6:26 amOntario
Frontier
Apr 26
ONT12:55 amOntario
2h 24m
DEN4:19 amDenver Intl
Apr 30
DEN7:29 amDenver Intl
6h 32m
1 stop
ONT1:01 pmOntario
Frontier
Apr 26
ONT12:55 amOntario
2h 24m
DEN4:19 amDenver Intl
Apr 30
DEN5:37 pmDenver Intl
5h 20m
1 stop
ONT9:57 pmOntario
Delta
Apr 27
ONT5:45 amOntario
5h 14m
1 stop
DEN11:59 amDenver Intl
Apr 27
DEN6:15 pmDenver Intl
4h 22m
1 stop
ONT9:37 pmOntario

Best airlines flying from Ontario to Denver

Compare and see reviews for airlines that fly from Ontario to Denver with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $51Free CancellationRating
6.3
4,175 reviews
Search Frontier flights
United AirlinesPriceFrom $117Free CancellationRating
7.4
11,346 reviews
Search United Airlines flights
DeltaPriceFrom $162Free CancellationRating
8.0
11,136 reviews
Search Delta flights
American AirlinesPriceFrom $208Free CancellationRating
7.3
14,973 reviews
Search American Airlines flights
  • United Airlines Flights From Ontario to Denver

    United Airlines flies from Ontario to Denver around 14 times per week, with 11,346 momondo users rating the airline 7.4/10. The cheapest United Airlines deal from Ontario to Denver in the last 72 hours was $117 (round-trip), much lower than the average airfare cost of $302 for United Airlines flights on this route.

  • Frontier Flights From Ontario to Denver

    Another popular option for Ontario to Denver flights is Frontier (6.3/10, 4,175 ratings). Frontier flies from Ontario to Denver around 11 times per week, with deals starting from $51 round-trip and rising to an average price of around $139.


Frontier flights from Ontario to Denver

Our best Frontier deals on Ontario to Denver flight tickets
Frontier
May 6
ONT12:59 amOntario
2h 24m
DEN4:23 amDenver Intl
May 8
DEN10:35 pmDenver Intl
2h 24m
ONT11:59 pmOntario
Frontier
May 19
ONT12:59 amOntario
2h 21m
DEN4:20 amDenver Intl
May 22
DEN12:10 pmDenver Intl
2h 24m
ONT1:34 pmOntario
Frontier
May 7
ONT12:59 amOntario
2h 24m
DEN4:23 amDenver Intl
May 8
DEN10:35 pmDenver Intl
2h 24m
ONT11:59 pmOntario

Delta flights from Ontario to Denver

Our best Delta deals on Ontario to Denver flight tickets
Delta
May 21
ONT1:20 pmOntario
4h 56m
1 stop
DEN7:16 pmDenver Intl
May 29
DEN8:45 amDenver Intl
4h 28m
1 stop
ONT12:13 pmOntario
Delta
Apr 27
ONT5:45 amOntario
5h 14m
1 stop
DEN11:59 amDenver Intl
Apr 27
DEN6:15 pmDenver Intl
4h 22m
1 stop
ONT9:37 pmOntario
Delta
Apr 26
ONT5:19 pmOntario
4h 51m
1 stop
DEN11:10 pmDenver Intl
Apr 27
DEN6:15 pmDenver Intl
4h 22m
1 stop
ONT9:37 pmOntario

How to get the cheapest flight ticket from Ontario to Denver

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly from Ontario to Denver?

February. The cheapest time of year to fly to Denver from Ontario is February. Most expensive is June

What is the cheapest day to depart Ontario for Denver?

Tuesday. The cheapest day of the week is typically Tuesday. The most expensive is typically Monday

When is the cheapest time to fly from Ontario to Denver?

In the evening. Ontario to Denver flights are approximately 33% more expensive at noon than in the evening

What is the cheapest airline that flies to Denver from Ontario?

Frontier. American Airlines, Delta, and Frontier are the most popular carriers operating from Ontario to Denver

What is the cheapest Ontario to Denver flight route?

Ontario - Denver Intl. Fly from Ontario to Denver Intl for the best Ontario - Denver flight prices

How far in advance should you book Ontario to Denver flights?

51 days before. The cheapest time to buy a flight from Ontario to Denver is approximately 51 days to departure

How many flights depart from Ontario to Denver on average per day?

The number of flights available between Ontario and Denver is 9 per day as of April 2024. The most frequent departure time is 4:00AM, with 52% of daily flights leaving in the morning.

How many flights depart from Ontario to Denver on average per week?

As of April 2024, 64 flights take off from Ontario and land in Denver each week. The most common flight departure day for this route is Sunday, with 16% of weekly flights taking off on this day.

What cabin class options are available on Ontario to Denver flights?

There are 3 cabin classes available to choose from on Ontario to Denver flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Denver flights?

No. A direct flight is the cheapest option for a flight between Ontario to Denver.

Cheap Ontario to Denver (ONT to DEN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Denver

Best Price Found

$34

Fastest flight time

2h 17m

Direct flights

Every day

Airports in Denver

1 airport
The best one-way flight to Denver from Ontario in the past 72 hours is $34. The best round-trip flight deal from Ontario to Denver found on momondo in the last 72 hours is $48.
The fastest flight from Ontario to Denver takes 2h 17m
Direct flights go from Ontario to Denver every day.
There is 1 airport near Denver: Denver Intl (DEN)

  • How far is Ontario to Denver Intl by plane?

    The straight-line distance from Ontario to Denver Intl is 800.5 mi. A reasonable flight in good conditions will take 2h 20m.

  • When did momondo last update prices for flights from Ontario Airport to Denver Intl Airport?

    Prices for flights from Ontario Airport to Denver Intl Airport were last updated today.

  • How many operators does momondo search for flights from Ontario Airport to Denver Intl Airport?

  • How old do you have to be to fly from Ontario Airport to Denver Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Denver Intl Airport.

  • What documentation or ID do you need to fly to Denver Intl Airport?

    The travel and health documents required for your trip to Denver Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Denver Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.


Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Denver?

Finding the right flight to Denver from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Denver quick and easy, saving you time and money.

Can I find flights from Ontario to Denver with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to Denver flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to Denver?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Denver.

I’m not ready to book a flight from Ontario to Denver right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Denver, momondo offers a useful price alert feature which will track prices for flights to Denver from Ontario and alert you when they change.


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Mon 4/22
Mon 4/29
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