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Cheap flights from Denver to Los Angeles from $38

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 Los Angeles departing on 10/7. 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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Cheap round-trip flights

Frontier Logo
10:29 pm - 11:50 pmDEN-ONT
2h 21mnonstop
Frontier Logo
12:59 am - 4:20 amONT-DEN
2h 21mnonstop
$78Frontier
Find Deal
Fri, Oct 10 - Sat, Oct 11
Frontier Logo
7:49 am - 9:09 amDEN-ONT
2h 20mnonstop
Frontier Logo
12:59 am - 4:19 amONT-DEN
2h 20mnonstop
$79Frontier
Find Deal
Fri, Aug 1 - Sat, Aug 2
Frontier Logo
10:29 pm - 11:50 pmDEN-ONT
2h 21mnonstop
Frontier Logo
8:59 pm - 12:26 amONT-DEN
2h 27mnonstop
$81Frontier
Find Deal
Fri, Aug 29 - Fri, Sep 5
Frontier Logo
8:35 am - 9:57 amDEN-ONT
2h 22mnonstop
Frontier Logo
8:59 pm - 12:26 amONT-DEN
2h 27mnonstop
$87Frontier
Find Deal
Mon, Sep 15 - Tue, Sep 16
Frontier Logo
10:29 pm - 11:50 pmDEN-ONT
2h 21mnonstop
Frontier Logo
12:59 am - 4:20 amONT-DEN
2h 21mnonstop
$91Frontier
Find Deal
Thu, Oct 9 - Fri, Oct 10
Frontier Logo
10:29 pm - 11:50 pmDEN-ONT
2h 21mnonstop
Frontier Logo
12:59 am - 4:19 amONT-DEN
2h 20mnonstop
$95Frontier
Find Deal
Tue, Jul 29 - Wed, Jul 30
Frontier Logo
7:49 am - 9:09 amDEN-ONT
2h 20mnonstop
Frontier Logo
5:21 pm - 8:44 pmONT-DEN
2h 23mnonstop
$99Frontier
Find Deal
Thu, Jul 31 - Sat, Aug 2
Frontier Logo
7:49 am - 9:09 amDEN-ONT
2h 20mnonstop
Frontier Logo
5:21 pm - 8:44 pmONT-DEN
2h 23mnonstop
$102Frontier
Find Deal
Wed, Jul 23 - Wed, Jul 30
Frontier Logo
10:29 pm - 11:50 pmDEN-ONT
2h 21mnonstop
Frontier Logo
12:59 am - 4:19 amONT-DEN
2h 20mnonstop
$103Frontier
Find Deal
Fri, Jul 25 - Wed, Jul 30
Frontier Logo
7:49 am - 9:09 amDEN-ONT
2h 20mnonstop
Frontier Logo
12:59 am - 4:19 amONT-DEN
2h 20mnonstop
$104Frontier
Find Deal
Thu, Jul 24 - Sat, Jul 26

Frontier flights from Denver to Ontario

Our best Frontier deals on Denver to Ontario flight tickets
Frontier
Oct 10
DEN10:29 pmDenver Intl
2h 21m
ONT11:50 pmOntario
Oct 11
ONT12:59 amOntario
2h 21m
DEN4:20 amDenver Intl
$78
Find similar
Frontier
Aug 1
DEN7:49 amDenver Intl
2h 20m
ONT9:09 amOntario
Aug 2
ONT12:59 amOntario
2h 20m
DEN4:19 amDenver Intl
$79
Find similar
Frontier
Aug 29
DEN10:29 pmDenver Intl
2h 21m
ONT11:50 pmOntario
Sep 5
ONT8:59 pmOntario
2h 27m
DEN12:26 amDenver Intl
$81
Find similar

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 cheapest month to fly to Ontario?

In general, January 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 $115. If you aren’t able to travel during the month of January, then book flights to Ontario from Denver during August instead. Flights to Ontario in August, while not as cheap as those in January, still average around $118.

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 Saturday when prices can be found for as low as $140. 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 $189.

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

In the evening is the cheapest time of day to fly from Denver to Ontario when you can find flight prices for as low as $150. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $198 on average. Flights to Ontario from Denver at noon 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?

You are more likely to see cheaper flights to Ontario from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $152 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Denver for as low as $113 on momondo.

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.

How have Denver to Ontario flight prices changed over time?

As of July 2025, prices for Denver to Ontario flights are approximately 31% cheaper 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

$38

Fastest flight time

2h 20m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Denver in the past 72 hours is $38. The best round-trip flight deal from Denver to Ontario found on momondo in the last 72 hours is $78.
The fastest flight from Denver to Ontario takes 2h 20m
Direct flights go from Denver to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)
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  • 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 20m.

  • 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 $57Free CancellationRating
5.9
3,271 reviews
Search Frontier flights
SouthwestPriceFrom $119Free CancellationRating
8.0
4,249 reviews
Search Southwest flights
United AirlinesPriceFrom $143Free CancellationRating
7.4
8,846 reviews
Search United Airlines flights

  • Southwest Flights From Denver to Ontario

    The lowest priced Southwest flight from Denver to Ontario from the last 72 hours was $119. Generally, Southwest has 20 flights on this route every week with an average price of $248. Southwest is rated 8.0/10 by our users.

  • United Airlines Flights From Denver to Ontario

    Another popular option for Denver to Ontario flights is United Airlines (7.4/10, 8,846 ratings). United Airlines flies from Denver to Ontario around 21 times per week, with deals starting from $143 round-trip and rising to an average price of around $287.

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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