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

As of September 2026, there are 55 flights per week flying from Denver to Ontario. The most common day of the week flights depart is Mon, with 22% of flights taking off on this day.

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

As of September 2026, 7 flights take off from Denver and land in Ontario each day. The most common flight departure time for this route is 9:00, with 46% of daily flights taking off in the evening.

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

United Airlines, Southwest, and Delta are the most popular carriers operating from Denver Intl to Ontario

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 are refreshed on a daily basis.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Denver Intl Airport to Ontario Airport.

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

The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

R1 282 Cheap Flights from Denver to Ontario in 2026/27

Find the cheapest flights from Denver to Los Angeles

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One-way

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13:15 - 14:40DEN Denver Intl-ONT Ontario

2h 25mdirect

13:55 - 17:05ONT Ontario-DEN Denver Intl

2h 10mdirect

R2 547Southwest

Wed, Nov 4 - Wed, Nov 11

5:45 - 8:45DEN Denver Intl-ONT Ontario

4h 00m1 stop Las Vegas Harry Reid Intl

8:55 - 12:05ONT Ontario-DEN Denver Intl

2h 10mdirect

R2 710Southwest

Sat, Oct 17 - Sat, Oct 24

14:45 - 20:45DEN Denver Intl-ONT Ontario

7h 00m2 stops Portland Oakland

13:50 - 17:10ONT Ontario-DEN Denver Intl

2h 20mdirect

R2 726Southwest

Thu, Jan 7 - Thu, Jan 14

5:55 - 10:45DEN Denver Intl-ONT Ontario

5h 50m1 stop Las Vegas Harry Reid Intl

16:15 - 21:00ONT Ontario-DEN Denver Intl

3h 45m1 stop Phoenix Sky Harbor Intl

R2 791Southwest

Wed, Oct 21 - Mon, Oct 26

14:55 - 21:20DEN Denver Intl-ONT Ontario

7h 25m2 stops Portland Oakland

16:15 - 21:00ONT Ontario-DEN Denver Intl

3h 45m1 stop Phoenix Sky Harbor Intl

R2 807Southwest

Wed, Oct 28 - Thu, Oct 29

14:55 - 20:02DEN Denver Intl-ONT Ontario

6h 07m1 stop Portland

7:10 - 14:07ONT Ontario-DEN Denver Intl

5h 57m1 stop Portland

R2 872Alaska Airlines

Thu, Jan 7 - Mon, Jan 11

5:45 - 11:10DEN Denver Intl-ONT Ontario

6h 25m2 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl

16:15 - 21:00ONT Ontario-DEN Denver Intl

3h 45m1 stop Phoenix Sky Harbor Intl

R2 888Southwest

Sat, Oct 24 - Mon, Oct 26

7:55 - 13:45DEN Denver Intl-ONT Ontario

6h 50m2 stops Phoenix Sky Harbor Intl San Jose

6:20 - 13:20ONT Ontario-DEN Denver Intl

6h 00m1 stop San Jose

R2 953Southwest

Sat, Oct 24 - Tue, Oct 27

5:45 - 11:10DEN Denver Intl-ONT Ontario

6h 25m2 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl

6:10 - 13:15ONT Ontario-DEN Denver Intl

6h 05m2 stops Phoenix Sky Harbor Intl Salt Lake City

R3 034Southwest

Sat, Oct 24 - Tue, Oct 27

10:45 - 16:23DEN Denver Intl-ONT Ontario

6h 38m1 stop Salt Lake City

17:03 - 23:04ONT Ontario-DEN Denver Intl

5h 01m1 stop Salt Lake City

R3 196Delta

Sat, Oct 24 - Mon, Oct 26

Cheap last-minute flights

Enter your travel dates to find the best prices.

11:26 - 12:46DEN Denver Intl-ONT Ontario

2h 20mdirect

5:00 - 8:21ONT Ontario-DEN Denver Intl

2h 21mdirect

R10 855United Airlines

Sat, Sep 26 - Tue, Sep 29

11:26 - 12:46DEN Denver Intl-ONT Ontario

2h 20mdirect

16:03 - 23:29ONT Ontario-DEN Denver Intl

6h 26m1 stop San Francisco

R10 920United Airlines

Tue, Sep 29 - Tue, Sep 29

6:00 - 10:23DEN Denver Intl-ONT Ontario

5h 23m1 stop San Francisco

8:03 - 14:24ONT Ontario-DEN Denver Intl

5h 21m1 stop San Francisco

R11 180United Airlines

Mon, Sep 28 - Tue, Sep 29

16:10 - 21:30DEN Denver Intl-ONT Ontario

6h 20m2 stops San Diego San Jose

6:40 - 12:40ONT Ontario-DEN Denver Intl

5h 00m1 stop Phoenix Sky Harbor Intl

R11 261Southwest

Mon, Sep 28 - Tue, Sep 29

16:10 - 21:30DEN Denver Intl-ONT Ontario

6h 20m2 stops San Diego San Jose

14:10 - 21:25ONT Ontario-DEN Denver Intl

6h 15m2 stops Las Vegas Harry Reid Intl Los Angeles

R11 342Southwest

Mon, Sep 28 - Tue, Sep 29

13:00 - 22:40DEN Denver Intl-ONT Ontario

10h 40m2 stops Salt Lake City Seattle/Tacoma Intl

13:04 - 19:40ONT Ontario-DEN Denver Intl

5h 36m1 stop Salt Lake City

R12 640Delta

Tue, Sep 29 - Thu, Oct 1

13:00 - 22:40DEN Denver Intl-ONT Ontario

10h 40m2 stops Salt Lake City Seattle/Tacoma Intl

6:00 - 17:02ONT Ontario-DEN Denver Intl

10h 02m2 stops Seattle/Tacoma Intl Salt Lake City

R12 802Delta

Tue, Sep 29 - Thu, Oct 1

20:06 - 15:47DEN Denver Intl-ONT Ontario

20h 41m2 stops San Diego Santa Rosa Sonoma County

11:55 - 10:16ONT Ontario-DEN Denver Intl

21h 21m2 stops Seattle/Tacoma Intl San Diego

R13 078Alaska Airlines

Sat, Sep 26 - Wed, Nov 25

13:00 - 22:40DEN Denver Intl-ONT Ontario

10h 40m2 stops Salt Lake City Seattle/Tacoma Intl

6:00 - 17:02ONT Ontario-DEN Denver Intl

10h 02m2 stops Seattle/Tacoma Intl Salt Lake City

R13 484Delta

Fri, Sep 25 - Wed, Sep 30

11:25 - 17:51DEN Denver Intl-ONT Ontario

7h 26m2 stops San Diego Carlsbad-Palomar San Francisco

16:03 - 22:09ONT Ontario-DEN Denver Intl

5h 06m1 stop San Francisco

R15 074United Airlines

Fri, Sep 25 - Fri, Oct 2

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Delta flights from Denver to Ontario

Our best Delta deals on Denver to Ontario flight tickets

Delta

Oct 24

DEN10:45Denver Intl

6h 38m

1 stop

ONT16:23Ontario

Oct 26

ONT17:03Ontario

5h 01m

1 stop

DEN23:04Denver Intl

R3 196

Delta

Oct 24

DEN10:45Denver Intl

6h 38m

1 stop

ONT16:23Ontario

Oct 26

ONT17:03Ontario

5h 01m

1 stop

DEN23:04Denver Intl

R3 213

Delta

Oct 24

DEN10:45Denver Intl

6h 38m

1 stop

ONT16:23Ontario

Oct 26

ONT17:03Ontario

5h 01m

1 stop

DEN23:04Denver Intl

R3 748

United Airlines flights from Denver to Ontario

Our best United Airlines deals on Denver to Ontario flight tickets

United Airlines

Oct 16

DEN19:35Denver Intl

2h 23m

ONT20:58Ontario

Oct 19

ONT5:00Ontario

2h 21m

DEN8:21Denver Intl

R3 326

United Airlines

Dec 22

DEN6:00Denver Intl

6h 58m

1 stop

ONT11:58Ontario

Dec 30

ONT13:05Ontario

6h 57m

1 stop

DEN21:02Denver Intl

R3 846

United Airlines

Oct 24

DEN19:35Denver Intl

2h 23m

ONT20:58Ontario

Oct 29

ONT5:00Ontario

2h 17m

DEN8:17Denver Intl

R4 170

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Wed 4/11

13:15-14:40

Nonstop2h 25m

Ontario

Wed 11/11

13:55-17:05

Nonstop2h 10m

R2 547

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Sat 17/10

5:45-8:45

1 stop4h 00m

Ontario

Sat 24/10

8:55-12:05

Nonstop2h 10m

R2 710

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Thu 7/1

14:45-20:45

2 stops7h 00m

Ontario

Thu 14/1

13:50-17:10

Nonstop2h 20m

R2 726

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Wed 21/10

5:55-10:45

1 stop5h 50m

Ontario

Mon 26/10

16:15-21:00

1 stop3h 45m

R2 791

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Wed 28/10

14:55-21:20

2 stops7h 25m

Ontario

Thu 29/10

16:15-21:00

1 stop3h 45m

R2 807

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Thu 7/1

14:55-20:02

1 stop6h 07m

Ontario

Mon 11/1

7:10-14:07

1 stop5h 57m

R2 872

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Sat 24/10

5:45-11:10

2 stops6h 25m

Ontario

Mon 26/10

16:15-21:00

1 stop3h 45m

R2 888

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Sat 24/10

7:55-13:45

2 stops6h 50m

Ontario

Tue 27/10

6:20-13:20

1 stop6h 00m

R2 953

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Sat 24/10

5:45-11:10

2 stops6h 25m

Ontario

Tue 27/10

6:10-13:15

2 stops6h 05m

R3 034

DenverOntario

DEN Denver Intl - ONT Ontario

DENONT

Denver Intl

Sat 24/10

10:45-16:23

1 stop6h 38m

Ontario

Mon 26/10

17:03-23:04

1 stop5h 01m

R3 196

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

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

Prices are currently typical for flights on this route.

Typical prices usually range from R2 093 to R4 559.
The lowest price recently found on this route was R2 547.

What is the cheapest month to fly to Ontario?

In general, May 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 R2 856. The month of April is another great option to travel to Ontario, with average flight prices from Denver averaging around R3 034.

How far in advance should I book a flight from Denver 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 R3 697 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Denver for as low as R2 742 on momondo.

How have Denver to Ontario flight prices changed over time?

As of September 2026, prices for Denver to Ontario flights are approximately 22% 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 return 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	R1 282
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from Denver in the past 72 hours is R1 282. The best return flight deal from Denver to Ontario found on momondo in the last 72 hours is R2 547.

Direct flights go from Denver to Ontario every day.

There is 1 airport in Ontario. From Denver there are direct flights to Ontario (ONT).

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Frequently asked questions about flying from Denver to Ontario

How far is Denver Intl to Ontario by plane?
Ontario is 1288,3 km away from Denver Intl.
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 are refreshed on a daily basis.
How old do you have to be to fly from Denver Intl Airport to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Denver Intl Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Denver to Ontario?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Denver to Ontario is Airbus A320neo (18,30% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (13,64%), Boeing 737-800 (9,67%), and Boeing 737 MAX 9 (9,60%).

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

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?

Of course. momondo tracks the price of Denver to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.