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

WestJet, Air Canada, and American Airlines are the most popular carriers operating from Ontario to Denver Intl

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

As of September 2025, 95 flights take off from Region of Ontario and land in Denver each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.

How long does it take to fly to Denver?

Flight times vary depending on what airport in Region of Ontario you fly out of and what airport in Denver you fly into. For example, flying from Ottawa to Denver takes 7h 08m on average. On the other hand, flying from Toronto to Denver takes 9h 03m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

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

The number of flights available between Region of Ontario and Denver is 13 per day as of September 2025. The most frequent departure time is 6:00PM, with 48% of daily flights leaving at noon.

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

Prices for flights from Ontario to Denver Intl Airport are refreshed on a daily basis.

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

The number of operators available for flights from Ontario to Denver Intl Airport is 2 as of September 2025.

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

$137 Cheap Flights from Ontario to Denver in 2025/26

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Find the cheapest flights from Ontario to Denver

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

5:15 am - 10:23 amYOW-DEN

7h 08m1 stop

6:00 am - 4:30 pmDEN-YOW

8h 30m1 stop

$263United Airlines

Find Deal

Thu, Feb 19 - Tue, Feb 24

6:20 am - 3:57 pmYOW-DEN

11h 37m1 stop

6:00 am - 4:30 pmDEN-YOW

8h 30m1 stop

$272United Airlines

Find Deal

Tue, Mar 3 - Wed, Mar 4

5:30 pm - 11:24 amYUL-DEN

19h 54m1 stop

8:00 am - 12:41 amDEN-YUL

14h 41m2 stops

$283

Find Deal

Sat, Sep 27 - Sat, Oct 11

7:00 am - 11:24 amYUL-DEN

30h 24m1 stop

12:15 pm - 12:27 amDEN-YUL

34h 12m2 stops

$291WestJet

Find Deal

Sat, Sep 27 - Mon, Sep 29

5:30 pm - 11:24 amYUL-DEN

19h 54m1 stop

8:00 am - 12:27 amDEN-YUL

14h 27m2 stops

$293

Find Deal

Sat, Sep 27 - Wed, Oct 8

6:45 am - 11:24 amYUL-DEN

30h 39m2 stops

12:15 pm - 12:27 amDEN-YUL

34h 12m2 stops

$303WestJet

Find Deal

Sat, Sep 27 - Mon, Sep 29

8:30 am - 10:23 amYYZ-DEN

3h 53mnonstop

8:45 am - 7:39 pmDEN-YYZ

8h 54m1 stop

$310Air Canada

Find Deal

Wed, Oct 29 - Wed, Nov 5

7:30 am - 5:44 pmYUL-DEN

12h 14m1 stop

8:45 am - 9:00 pmDEN-YUL

10h 15m1 stop

$312Air Canada

Find Deal

Thu, Oct 30 - Thu, Nov 6

7:55 am - 4:47 pmYYZ-DEN

10h 52m1 stop

12:50 am - 10:42 amDEN-YYZ

7h 52m1 stop

$327Delta

Find Deal

Wed, Oct 8 - Mon, Oct 13

1:20 pm - 8:15 pmYYZ-DEN

8h 55m1 stop

12:55 am - 8:55 amDEN-YYZ

6h 00m1 stop

$329Delta

Find Deal

Sat, Oct 11 - Fri, Oct 17

United Airlines flights from Region of Ontario to Denver

Our best United Airlines deals on Region of Ontario to Denver flight tickets

United Airlines

Feb 19

YOW5:15 amOttawa

7h 08m

1 stop

DEN10:23 amDenver Intl

Feb 24

DEN6:00 amDenver Intl

8h 30m

1 stop

YOW4:30 pmOttawa

$263

Find similar

United Airlines

Mar 3

YOW6:20 amOttawa

11h 37m

1 stop

DEN3:57 pmDenver Intl

Mar 4

DEN6:00 amDenver Intl

8h 30m

1 stop

YOW4:30 pmOttawa

$272

Find similar

United Airlines

Dec 2

YOW5:15 amOttawa

7h 08m

1 stop

DEN10:23 amDenver Intl

Dec 8

DEN4:10 pmDenver Intl

16h 16m

1 stop

YOW10:26 amOttawa

$273

Find similar

WestJet flights from Region of Ontario to Denver

Our best WestJet deals on Region of Ontario to Denver flight tickets

WestJet

Sep 27

YUL7:00 amMontreal Pierre Elliott Trudeau Intl

30h 24m

1 stop

DEN11:24 amDenver Intl

Sep 29

DEN12:15 pmDenver Intl

34h 12m

2 stops

YUL12:27 amMontreal Pierre Elliott Trudeau Intl

$291

Find similar

WestJet

Sep 27

YUL6:45 amMontreal Pierre Elliott Trudeau Intl

30h 39m

2 stops

DEN11:24 amDenver Intl

Sep 29

DEN12:15 pmDenver Intl

34h 12m

2 stops

YUL12:27 amMontreal Pierre Elliott Trudeau Intl

$303

Find similar

WestJet

Sep 27

YUL5:30 pmMontreal Pierre Elliott Trudeau Intl

19h 54m

1 stop

DEN11:24 amDenver Intl

Oct 6

DEN12:15 pmDenver Intl

34h 12m

2 stops

YUL12:27 amMontreal Pierre Elliott Trudeau Intl

$309

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 2/19

5:15 am-10:23 am

1 stop7h 08m

Denver Intl

Tue 2/24

6:00 am-4:30 pm

1 stop8h 30m

$263

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 3/3

6:20 am-3:57 pm

1 stop11h 37m

Denver Intl

Wed 3/4

6:00 am-4:30 pm

1 stop8h 30m

$272

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sat 9/27

5:30 pm-11:24 am

1 stop19h 54m

Denver Intl

Sat 10/11

8:00 am-12:41 am

2 stops14h 41m

$283

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sat 9/27

7:00 am-11:24 am

1 stop30h 24m

Denver Intl

Mon 9/29

12:15 pm-12:27 am

2 stops34h 12m

$291

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sat 9/27

5:30 pm-11:24 am

1 stop19h 54m

Denver Intl

Wed 10/8

8:00 am-12:27 am

2 stops14h 27m

$293

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sat 9/27

6:45 am-11:24 am

2 stops30h 39m

Denver Intl

Mon 9/29

12:15 pm-12:27 am

2 stops34h 12m

$303

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 10/29

8:30 am-10:23 am

Nonstop3h 53m

Denver Intl

Wed 11/5

8:45 am-7:39 pm

1 stop8h 54m

$310

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Thu 10/30

7:30 am-5:44 pm

1 stop12h 14m

Denver Intl

Thu 11/6

8:45 am-9:00 pm

1 stop10h 15m

$312

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 10/8

7:55 am-4:47 pm

1 stop10h 52m

Denver Intl

Mon 10/13

12:50 am-10:42 am

1 stop7h 52m

$327

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 10/11

1:20 pm-8:15 pm

1 stop8h 55m

Denver Intl

Fri 10/17

12:55 am-8:55 am

1 stop6h 00m

$329

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Region of 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

Prices

Airlines

Other information

What is the cheapest month to fly to Denver?

The cheapest month to fly to Denver from Region of Ontario is in November. Flight prices, which tend to average around $421, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in November, then you should wait until October to fly from Region of Ontario, when ticket prices are also cheap, with an average price of $423.

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

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $429. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $576.

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

The cheapest time of day to fly to Denver is at noon when flights can be purchased for as low as $416. Flights in the morning are often more expensive with an average ticket price of $514.

What is the cheapest Ontario to Denver Intl flight route?

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

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

You are more likely to see cheaper flights to Denver from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $460 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Region of Ontario for as low as $402 on momondo.

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

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

You could potentially save up to 21% on your flight if you consider stops on a Region of Ontario to Denver flight.

Cheap Region of Ontario to Denver flight deals and tips

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

Best Price Found	$245
Fastest flight time	3h 34m
Direct flights	Every day
Airports in Denver	1 airport

The best one-way flight to Denver from Region of Ontario in the past 72 hours is $245. The best round-trip flight deal from Region of Ontario to Denver found on momondo in the last 72 hours is $361.

The fastest flight from Region of Ontario to Denver takes 3h 34m

Direct flights go from Region of Ontario to Denver every day.

There is 1 airport near Denver: Denver Intl (DEN)

Search flight deals

When did momondo last update prices for flights from Ontario to Denver Intl Airport?
Prices for flights from Ontario to Denver Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario to Denver Intl Airport?
The number of operators available for flights from Ontario to Denver Intl Airport is 2 as of September 2025.
How old do you have to be to fly from Ontario to Denver Intl 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 Ontario 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.
What is the most popular plane model from Region of Ontario to Denver?
Based on momondo bookings for flights between Region of Ontario and Denver, the leading plane model is Airbus A319, making up 23.17% of the total bookings. Other popular models include Embraer 195 E2 with 20.47%, Airbus A220-300 with 9.90%, and Airbus A350-900 with 9.27%.

Best airlines flying from Region of Ontario to Denver

Compare and see reviews for airlines that fly from Region of Ontario to Denver with momondo

Airline	Rating	Free Cancellation	Price
Air Canada	PriceFrom $254	Free Cancellation	Rating 7.1 10,000 reviews		Search Air Canada flights
United Airlines	PriceFrom $384	Free Cancellation	Rating 7.4 8,931 reviews		Search United Airlines flights

Estes Park

Breckenridge

Black Hawk

Aurora

Fort Collins

Keystone

Cripple Creek

Boulder

Manitou Springs

Longmont

Lakewood

Greeley

Thornton

Westminster

Winter Park

Copper Mountain

Frisco

Grand Lake

Silverthorne

Central City

Why use momondo?

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

It is quick and easy to find Ontario to Denver flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Denver that suits you.

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

Yes. All flights to Denver from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Denver from Ontario.

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

Yes momondo offers price alerts on flights to Denver from Ontario. 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.

An easier way to manage your Denver trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from Ontario to Denver from $137

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 10/6. 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 Ontario to Denver

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United Airlines flights from Region of Ontario to Denver

Our best United Airlines deals on Region of Ontario to Denver flight tickets

WestJet flights from Region of Ontario to Denver

Our best WestJet deals on Region of Ontario to Denver flight tickets

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Use the filters below to find and compare flights from Ontario to Denver that are best for you.

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How to get the cheapest flight ticket from Region of 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 to Denver?

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

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $429. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $576.

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

The cheapest time of day to fly to Denver is at noon when flights can be purchased for as low as $416. Flights in the morning are often more expensive with an average ticket price of $514.

What is the cheapest Ontario to Denver Intl flight route?

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

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

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

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

You could potentially save up to 21% on your flight if you consider stops on a Region of Ontario to Denver flight.

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

WestJet, Air Canada, and American Airlines are the most popular carriers operating from Ontario to Denver Intl

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

The number of flights available between Region of Ontario and Denver is 13 per day as of September 2025. The most frequent departure time is 6:00PM, with 48% of daily flights leaving at noon.

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

As of September 2025, 95 flights take off from Region of Ontario and land in Denver each week. The most common flight departure day for this route is Mon, with 15% of weekly flights taking off on this day.

How long does it take to fly to Denver?

Cheap Region of Ontario to Denver flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Denver

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

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

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

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

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

Best airlines flying from Region of Ontario to Denver

Compare and see reviews for airlines that fly from Region of Ontario to Denver with momondo

Traveling to a place near Denver?

Why use momondo?

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

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

How can momondo help me find flights 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?

An easier way to manage your Denver trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Colorado