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

Air Canada, United Airlines, and WestJet 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 December 2025, 72 flights take off from Region of Ontario and land in Denver each week. The most common flight departure day for this route is Sun, with 17% of weekly flights taking off on this day.

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 10 per day as of December 2025. The most frequent departure time is 2:00PM, with 68% of daily flights leaving in the afternoon.

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 8h 09m on average. On the other hand, flying from Toronto to Denver takes 8h 31m 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.

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 December 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.

$132 Cheap Flights from Ontario to Denver in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Ontario to Denver

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:00 am - 10:13 am

YOW

DEN

29h 13m2 stops

11:59 pm - 5:13 pm

DEN

YOW

15h 14m1 stop

$298Multiple Airlines

Tue, Feb 3 - Tue, Feb 10

4:20 pm - 10:00 am

YOW

DEN

19h 40m1 stop

11:59 pm - 5:13 pm

DEN

YOW

15h 14m1 stop

$309Multiple Airlines

Tue, Feb 3 - Tue, Feb 10

9:40 am - 2:25 pm

YOW

DEN

30h 45m1 stop

9:12 pm - 5:25 pm

DEN

YOW

18h 13m2 stops

$323Multiple Airlines

Mon, Jan 12 - Fri, Jan 16

9:40 am - 12:19 pm

YOW

DEN

52h 39m2 stops

6:32 pm - 5:13 pm

DEN

YOW

20h 41m1 stop

$328Multiple Airlines

Mon, Jan 19 - Mon, Jan 26

5:25 pm - 7:55 pm

YUL

DEN

4h 30mnonstop

11:15 am - 4:58 pm

DEN

YUL

3h 43mnonstop

$373Air Canada

Tue, Jan 13 - Tue, Jan 20

4:45 pm - 11:58 pm

YYZ

DEN

33h 13m2 stops

11:49 am - 3:35 pm

DEN

YYZ

25h 46m2 stops

$374Alaska Airlines

Thu, Feb 5 - Tue, Feb 10

4:45 pm - 10:53 am

YYZ

DEN

20h 08m2 stops

7:00 am - 3:35 pm

DEN

YYZ

30h 35m1 stop

$375Alaska Airlines

Mon, Jan 12 - Sun, Jan 18

5:25 pm - 7:55 pm

YUL

DEN

4h 30mnonstop

8:05 am - 7:25 pm

DEN

YUL

9h 20m1 stop

$378Air Canada

Tue, Jan 13 - Tue, Jan 20

7:04 pm - 11:16 pm

YYZ

DEN

6h 12m1 stop

7:00 am - 9:29 pm

DEN

YYZ

12h 29m1 stop

$385American Airlines

Wed, Feb 11 - Sat, Feb 14

5:40 am - 8:44 pm

YOW

DEN

17h 04m2 stops

10:34 am - 12:39 am

DEN

YOW

12h 05m2 stops

$571Delta

Mon, Feb 2 - Wed, Feb 4

Air Canada flights from Region of Ontario to Denver

Our best Air Canada deals on Region of Ontario to Denver flight tickets

Air Canada

Jan 13

YUL5:25 pmMontreal Pierre Elliott Trudeau Intl

4h 30m

DEN7:55 pmDenver Intl

Jan 20

DEN11:15 amDenver Intl

3h 43m

YUL4:58 pmMontreal Pierre Elliott Trudeau Intl

$373

Find similar

Air Canada

Jan 13

YUL5:25 pmMontreal Pierre Elliott Trudeau Intl

4h 30m

DEN7:55 pmDenver Intl

Jan 20

DEN8:05 amDenver Intl

9h 20m

1 stop

YUL7:25 pmMontreal Pierre Elliott Trudeau Intl

$378

Find similar

Air Canada

Feb 1

YUL7:30 amMontreal Pierre Elliott Trudeau Intl

12h 14m

1 stop

DEN5:44 pmDenver Intl

Feb 10

DEN8:05 amDenver Intl

9h 20m

1 stop

YUL7:25 pmMontreal Pierre Elliott Trudeau Intl

$383

Find similar

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 28

YYZ4:10 pmToronto Pearson Intl

4h 00m

DEN6:10 pmDenver Intl

Mar 3

DEN9:51 amDenver Intl

3h 11m

YYZ3:02 pmToronto Pearson Intl

$408

Find similar

United Airlines

Jan 12

YYZ4:10 pmToronto Pearson Intl

4h 00m

DEN6:10 pmDenver Intl

Jan 18

DEN3:15 pmDenver Intl

6h 44m

1 stop

YYZ11:59 pmToronto Pearson Intl

$418

Find similar

United Airlines

Feb 25

YYZ4:10 pmToronto Pearson Intl

4h 00m

DEN6:10 pmDenver Intl

Mar 1

DEN6:00 amDenver Intl

6h 01m

1 stop

YYZ2:01 pmToronto Pearson Intl

$421

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 2/3

7:00 am-10:13 am

2 stops29h 13m

Denver Intl

Tue 2/10

11:59 pm-5:13 pm

1 stop15h 14m

$298

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 2/3

4:20 pm-10:00 am

1 stop19h 40m

Denver Intl

Tue 2/10

11:59 pm-5:13 pm

1 stop15h 14m

$309

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 1/12

9:40 am-2:25 pm

1 stop30h 45m

Denver Intl

Fri 1/16

9:12 pm-5:25 pm

2 stops18h 13m

$323

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 1/19

9:40 am-12:19 pm

2 stops52h 39m

Denver Intl

Mon 1/26

6:32 pm-5:13 pm

1 stop20h 41m

$328

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Tue 1/13

5:25 pm-7:55 pm

Nonstop4h 30m

Denver Intl

Tue 1/20

11:15 am-4:58 pm

Nonstop3h 43m

$373

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 2/5

4:45 pm-11:58 pm

2 stops33h 13m

Denver Intl

Tue 2/10

11:49 am-3:35 pm

2 stops25h 46m

$374

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Mon 1/12

4:45 pm-10:53 am

2 stops20h 08m

Denver Intl

Sun 1/18

7:00 am-3:35 pm

1 stop30h 35m

$375

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Tue 1/13

5:25 pm-7:55 pm

Nonstop4h 30m

Denver Intl

Tue 1/20

8:05 am-7:25 pm

1 stop9h 20m

$378

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 2/11

7:04 pm-11:16 pm

1 stop6h 12m

Denver Intl

Sat 2/14

7:00 am-9:29 pm

1 stop12h 29m

$385

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 2/2

5:40 am-8:44 pm

2 stops17h 04m

Denver Intl

Wed 2/4

10:34 am-12:39 am

2 stops12h 05m

$571

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 $394, 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 August to fly from Region of Ontario, when ticket prices are also cheap, with an average price of $418.

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 $437. 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 $601.

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 $452. Flights in the morning are often more expensive with an average ticket price of $515.

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 $448 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 $408 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 22% 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	$282
Fastest flight time	3h 46m
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 $282. The best round-trip flight deal from Region of Ontario to Denver found on momondo in the last 72 hours is $472.

The fastest flight from Region of Ontario to Denver takes 3h 46m

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

There is 1 airport in Denver. From Region of Ontario there are direct flights to 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 December 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 A220-300, making up 27.45% of the total bookings. Other popular models include Embraer 195 E2 with 23.36%, Airbus A319 with 12.34%, and Boeing 737 MAX 8 with 8.54%.

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
United Airlines	PriceFrom $251	Free Cancellation	Rating 7.4 9,106 reviews		Search United Airlines flights
Air Canada	PriceFrom $267	Free Cancellation	Rating 7.1 10,551 reviews		Search Air Canada flights

Breckenridge

Estes Park

Black Hawk

Aurora

Fort Collins

Keystone

Cripple Creek

Manitou Springs

Longmont

Boulder

Greeley

Lakewood

Thornton

Westminster

Winter Park

Copper Mountain

Frisco

Silverthorne

Centennial

Grand Lake

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Wed 1/21

Wed 1/28

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Cheap flights from Ontario to Denver from $132

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 3/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Ontario to Denver

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Air Canada flights from Region of Ontario to Denver

Our best Air Canada deals on Region of Ontario to Denver flight tickets

United Airlines flights from Region of Ontario to Denver

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

momondo Fare Finder

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

See travel insights to Denver from

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

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 $437. 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 $601.

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 $452. Flights in the morning are often more expensive with an average ticket price of $515.

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 22% 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?

Air Canada, United Airlines, and WestJet 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 10 per day as of December 2025. The most frequent departure time is 2:00PM, with 68% of daily flights leaving in the afternoon.

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

As of December 2025, 72 flights take off from Region of Ontario and land in Denver each week. The most common flight departure day for this route is Sun, with 17% 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