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Cheap flights from Denver to Ontario from $29

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to Ontario departing on 2/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Denver to Los Angeles

Cheap round-trip flights

These are some of the best round-trip flight deals from Denver to Los Angeles that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from Denver to Los Angeles.

Cheap last minute flights

Planning a quick getaway from Denver to Los Angeles? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Los Angeles, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Denver to Los Angeles

Find recent round-trip train or bus tickets from Denver to Los Angeles.

All round-trip flight deals to Los Angeles

The cheapest plane tickets to Los Angeles found on KAYAK recently.
10:15 pm - 11:47 pmDEN-ONT
2h 32mnonstop
7:45 am - 11:10 amONT-DEN
2h 25mnonstop
$58Frontier
Find Deal
Wed, Jan 22 - Wed, Jan 29
10:14 pm - 11:44 pmDEN-ONT
2h 30mnonstop
7:45 am - 11:03 amONT-DEN
2h 18mnonstop
$61Frontier
Find Deal
Wed, Jan 8 - Tue, Jan 14
11:24 am - 3:29 pmDEN-ONT
5h 05m1 stop
10:00 am - 3:19 pmONT-DEN
4h 19m1 stop
$207American Airlines
Find Deal
Tue, Jan 21 - Tue, Jan 28
6:37 pm - 11:58 pmDEN-ONT
6h 21m1 stop
1:19 pm - 4:46 pmONT-DEN
2h 27mnonstop
Thu, Apr 24 - Sun, Apr 27
8:25 am - 12:26 pmDEN-ONT
5h 01m1 stop
1:21 pm - 7:21 pmONT-DEN
5h 00m1 stop
$216Delta
Find Deal
Thu, Jan 23 - Mon, Jan 27
8:25 am - 12:26 pmDEN-ONT
5h 01m1 stop
5:10 pm - 10:47 pmONT-DEN
4h 37m1 stop
$236Delta
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Thu, Jan 16 - Tue, Jan 21
7:25 pm - 8:51 pmDEN-ONT
2h 26mnonstop
5:05 am - 8:24 amONT-DEN
2h 19mnonstop
$237United Airlines
Find Deal
Mon, Feb 10 - Sat, Feb 15
7:25 pm - 8:51 pmDEN-ONT
2h 26mnonstop
5:10 am - 8:29 amONT-DEN
2h 19mnonstop
$238United Airlines
Find Deal
Sat, Jan 25 - Sun, Jan 26
11:37 am - 3:37 pmDEN-ONT
5h 00m1 stop
6:13 am - 11:40 amONT-DEN
4h 27m1 stop
$247American Airlines
Find Deal
Thu, Feb 13 - Tue, Feb 18
10:50 pm - 7:11 amDEN-ONT
9h 21m1 stop
7:00 am - 10:36 pmONT-DEN
14h 36m2 stops
Fri, Jan 24 - Mon, Jan 27
10:27 pm - 11:59 pmDEN-ONT
2h 32mnonstop
$29Frontier
Find Deal
Tue, Feb 25
10:14 pm - 11:44 pmDEN-ONT
2h 30mnonstop
$32Frontier
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Tue, Jan 7
9:35 am - 11:05 amDEN-ONT
2h 30mnonstop
$99Southwest
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Tue, Jan 14
10:59 am - 4:28 pmDEN-ONT
6h 29m1 stop
$107Delta
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Tue, Jan 14
10:59 am - 4:28 pmDEN-ONT
6h 29m1 stop
$108Delta
Find Deal
Tue, Jan 21
11:17 am - 12:43 pmDEN-ONT
2h 26mnonstop
$109United Airlines
Find Deal
Sat, Jan 25
1:34 pm - 6:04 pmDEN-ONT
5h 30m1 stop
$118United Airlines
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Tue, Feb 11
7:00 am - 3:32 pmDEN-ONT
9h 32m1 stop
$150Alaska Airlines
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Wed, Apr 23
2:05 pm - 8:15 pmDEN-ONT
7h 10m2 stops
$153Southwest
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Sat, Jan 25
7:00 am - 5:04 pmDEN-ONT
11h 04m2 stops
$156Alaska Airlines
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Tue, Jan 28
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
12:59 am - 4:22 amONT-DEN
2h 23mnonstop
$111Frontier
Find Deal
Sun, Dec 29 - Tue, Dec 31
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
12:59 am - 4:22 amONT-DEN
2h 23mnonstop
$126Frontier
Find Deal
Sun, Dec 29 - Sat, Jan 4
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
4:51 pm - 8:09 pmONT-DEN
2h 18mnonstop
$131Frontier
Find Deal
Sun, Dec 29 - Mon, Jan 6
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
12:59 am - 4:22 amONT-DEN
2h 23mnonstop
$137Frontier
Find Deal
Sun, Dec 29 - Sat, Jan 4
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
12:59 am - 4:22 amONT-DEN
2h 23mnonstop
$152Frontier
Find Deal
Sat, Dec 28 - Sat, Jan 4
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
12:59 am - 4:22 amONT-DEN
2h 23mnonstop
$153Frontier
Find Deal
Sun, Dec 29 - Mon, Dec 30
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
4:51 pm - 8:09 pmONT-DEN
2h 18mnonstop
$158Frontier
Find Deal
Sun, Dec 29 - Mon, Jan 6
10:29 pm - 11:59 pmDEN-ONT
2h 30mnonstop
12:59 am - 4:22 amONT-DEN
2h 23mnonstop
$164Frontier
Find Deal
Fri, Dec 27 - Sat, Jan 4
7:23 pm - 1:16 pmDEN-ONT
18h 53m2 stops
6:50 pm - 8:41 amONT-DEN
12h 51m2 stops
$682United Airlines
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Thu, Dec 26 - Mon, Dec 30
4:00 pm - 5:26 pmDEN-ONT
2h 26mnonstop
6:30 pm - 9:49 pmONT-DEN
2h 19mnonstop
$683United Airlines
Find Deal
Thu, Dec 26 - Wed, Jan 1
10:15 pm - 11:47 pmDEN-ONT
2h 32mnonstop
7:45 am - 11:10 amONT-DEN
2h 25mnonstop
$58Frontier
Find Deal
Wed, Jan 22 - Wed, Jan 29
10:14 pm - 11:44 pmDEN-ONT
2h 30mnonstop
7:45 am - 11:03 amONT-DEN
2h 18mnonstop
$61Frontier
Find Deal
Wed, Jan 8 - Tue, Jan 14
10:15 pm - 11:47 pmDEN-ONT
2h 32mnonstop
6:34 pm - 9:55 pmONT-DEN
2h 21mnonstop
$68Frontier
Find Deal
Sat, Feb 1 - Fri, Feb 7
10:15 pm - 11:47 pmDEN-ONT
2h 32mnonstop
8:11 pm - 11:33 pmONT-DEN
2h 22mnonstop
$69Frontier
Find Deal
Sat, Jan 25 - Sun, Jan 26
10:15 pm - 11:47 pmDEN-ONT
2h 32mnonstop
6:45 am - 10:04 amONT-DEN
2h 19mnonstop
$70Frontier
Find Deal
Sat, Jan 18 - Sat, Jan 25
11:17 am - 12:43 pmDEN-ONT
2h 26mnonstop
1:45 pm - 5:04 pmONT-DEN
2h 19mnonstop
$157United Airlines
Find Deal
Sat, Feb 8 - Wed, Feb 12
7:25 pm - 8:52 pmDEN-ONT
2h 27mnonstop
1:44 pm - 5:03 pmONT-DEN
2h 19mnonstop
$217United Airlines
Find Deal
Sat, Feb 15 - Sat, Feb 22
7:25 pm - 8:51 pmDEN-ONT
2h 26mnonstop
5:05 am - 8:24 amONT-DEN
2h 19mnonstop
$237United Airlines
Find Deal
Mon, Feb 10 - Sat, Feb 15
7:45 pm - 9:10 pmDEN-ONT
2h 25mnonstop
4:40 pm - 7:55 pmONT-DEN
2h 15mnonstop
$398Southwest
Find Deal
Thu, Mar 13 - Tue, Mar 18
10:45 pm - 12:10 amDEN-ONT
2h 25mnonstop
11:25 am - 2:35 pmONT-DEN
2h 10mnonstop
$418Southwest
Find Deal
Fri, Mar 21 - Wed, Mar 26

Frontier flights from Denver to Ontario

Our best Frontier deals on Denver to Ontario flight tickets
Frontier
Jan 22
DEN10:15 pmDenver Intl
2h 32m
ONT11:47 pmOntario
Jan 29
ONT7:45 amOntario
2h 25m
DEN11:10 amDenver Intl
Frontier
Dec 31
DEN10:29 pmDenver Intl
2h 30m
ONT11:59 pmOntario
Jan 14
ONT7:45 amOntario
2h 18m
DEN11:03 amDenver Intl
Frontier
Jan 8
DEN10:14 pmDenver Intl
2h 30m
ONT11:44 pmOntario
Jan 14
ONT7:45 amOntario
2h 18m
DEN11:03 amDenver Intl

United Airlines flights from Denver to Ontario

Our best United Airlines deals on Denver to Ontario flight tickets
United Airlines
Feb 10
DEN7:25 pmDenver Intl
2h 26m
ONT8:51 pmOntario
Feb 15
ONT5:05 amOntario
2h 19m
DEN8:24 amDenver Intl
United Airlines
Jan 25
DEN7:25 pmDenver Intl
2h 26m
ONT8:51 pmOntario
Jan 26
ONT5:10 amOntario
2h 19m
DEN8:29 amDenver Intl
United Airlines
Jan 25
DEN7:25 pmDenver Intl
2h 26m
ONT8:51 pmOntario
Jan 26
ONT1:45 pmOntario
2h 19m
DEN5:04 pmDenver Intl

See travel insights to Los Angeles from

How to get the cheapest flight ticket from Denver to Ontario

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 typical price of a round-trip flight between Denver and Ontario?

What is the cheapest month to fly to Ontario?

In general, April is the cheapest month to fly from Denver to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $104. If you aren’t able to travel during the month of April, then book flights to Ontario from Denver during August instead. Flights to Ontario in August, while not as cheap as those in April, still average around $112.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $119. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Denver to Ontario for around $170.

What is the cheapest time of day to depart on your flight to Ontario?

In the morning is the cheapest time of day to fly from Denver to Ontario when you can find flight prices for as low as $134. Flying to Ontario in the morning is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $178 on average. Flights to Ontario from Denver in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Denver Intl to Ontario flight route?

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

How far in advance should I book a flight to Ontario?

Most flyers found that booking tickets 52 days in advance of their planned departure date is the best time to get cheap flights to Ontario. During this timeframe, flight prices are around $142. However, in the past 72 hours, people saw flights from Denver for as low as $61.

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

There are 4 cabin classes available to choose from on Denver Intl to Ontario 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 Denver to Ontario flights?

You could potentially save up to 82% on your flight if you consider stops on a Denver to Ontario flight.

How have Denver to Ontario flight prices changed over time?

As of December 2024, prices for Denver to Ontario flights are approximately 2% more expensive when compared to flights at the same time last year.

When to book flights from Denver to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Denver to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

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

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

Best Price Found

$29

Fastest flight time

2h 21m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Denver in the past 72 hours is $29. The best round-trip flight deal from Denver to Ontario found on momondo in the last 72 hours is $58.
The fastest flight from Denver to Ontario takes 2h 21m
Direct flights go from Denver to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)

  • How far is Denver Intl to Ontario by plane?

    Denver Intl and Ontario are 800.5 mi apart from one another. In terms of flight time, this usually takes a little over 2h 21m.

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

    Prices for flights from Denver Intl Airport to Ontario Airport refresh daily.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Ontario Airport.

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

    The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Denver to Ontario?

  • What is the most popular airline from Denver to Ontario?


Best airlines flying from Denver to Ontario

Compare and see reviews for airlines that fly from Denver to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $47Free CancellationRating
6.1
3,468 reviews
Search Frontier flights
United AirlinesPriceFrom $139Free CancellationRating
7.4
9,009 reviews
Search United Airlines flights
SouthwestPriceFrom $178Free CancellationRating
8.1
4,765 reviews
Search Southwest flights
  • Southwest Flights From Denver to Ontario

    The lowest priced Southwest flight from Denver to Ontario from the last 72 hours was $178. Generally, Southwest has 26 flights on this route every week with an average price of $273. Southwest is rated 8.1/10 by our users.

  • United Airlines Flights From Denver to Ontario

    Another popular option for Denver to Ontario flights is United Airlines (7.4/10, 9,009 ratings). United Airlines flies from Denver to Ontario around 11 times per week, with deals starting from $139 round-trip and rising to an average price of around $313.


Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Denver.

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

Yes. momondo enables you to select and highlight flights to Ontario from Denver with this policy.

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

Once all potential Denver to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to Ontario from Denver. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.


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