What is the cheapest airline that flies from Colorado to Ontario?

United Airlines, WestJet, and Sun Country Air are the most popular carriers operating from Colorado to Ontario

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

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

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

13 flights are operational daily from Colorado to Region of Ontario as of September 2025. The most popular departure time for this route is 11:00AM, with 81% of flights per day taking off at noon.

How long is the flight from Colorado to Region of Ontario?

Average flight duration from Colorado to Region of Ontario depends on which airport you fly into and out of. Flying from Denver to Toronto Pearson Intl Airport is 3h 10m on average, while flying from Colorado Springs to Toronto Pearson Intl Airport is 5h 08m on average. Toronto Pearson Intl Airport is the most popular airport in Region of Ontario.

What airlines fly to Region of Ontario?

Air Canada, United Airlines and WestJet are the top three most popular airlines that fly to Region of Ontario from Colorado according to our data. Air Canada is the first choice among our users, with 63% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 4 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Colorado to Ontario?

Prices for flights from Colorado to Ontario are updated daily.

How many operators does momondo search for flights from Colorado to Ontario?

As of September 2025, there are 5 operators available to choose from for flights from Colorado to Ontario.

How old do you have to be to fly from Colorado to Ontario?

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 layovers. It is recommended that you verify with the airline you are booking with for travel from Colorado to Ontario.

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

The travel and health documents you'll need for your trip to Ontario 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 license and a passport that is valid for six months after your intended arrival at Ontario. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$138 Cheap Flights from Colorado to Ontario in 2025/26

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Find the cheapest flights from Colorado to Ontario

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

6:00 am - 9:50 pmDEN-YYZ

13h 50m1 stop

12:00 pm - 3:59 amYYZ-DEN

17h 59m2 stops

$286Multiple Airlines

Find Deal

Thu, Oct 16 - Wed, Oct 22

6:00 am - 9:50 pmDEN-YYZ

13h 50m1 stop

9:45 am - 3:59 amYYZ-DEN

20h 14m1 stop

$290Multiple Airlines

Find Deal

Thu, Oct 16 - Wed, Oct 22

6:00 am - 4:43 pmDEN-YOW

8h 43m1 stop

5:15 am - 11:58 amYOW-DEN

8h 43m1 stop

$327United Airlines

Find Deal

Wed, Oct 22 - Sat, Oct 25

7:48 am - 9:35 pmDEN-YOW

11h 47m1 stop

5:25 pm - 10:00 pmYOW-DEN

6h 35m1 stop

$330United Airlines

Find Deal

Sat, Oct 4 - Sat, Oct 11

11:15 am - 5:00 pmDEN-YUL

3h 45mnonstop

5:25 pm - 7:55 pmYUL-DEN

4h 30mnonstop

$445Air Canada

Find Deal

Sun, Oct 19 - Mon, Oct 27

1:25 pm - 9:40 pmDEN-YUL

6h 15m1 stop

5:25 pm - 7:55 pmYUL-DEN

4h 30mnonstop

$451Air Canada

Find Deal

Sun, Oct 19 - Mon, Oct 27

8:09 am - 4:40 pmCOS-YYZ

6h 31m1 stop

11:52 am - 8:30 pmYYZ-COS

10h 38m1 stop

$494Delta

Find Deal

Sat, Oct 11 - Tue, Oct 14

12:55 am - 12:02 pmDEN-YUL

9h 07m1 stop

6:00 am - 10:11 amYUL-DEN

6h 11m1 stop

$497Delta

Find Deal

Fri, Oct 17 - Wed, Oct 22

12:15 pm - 12:40 amDEN-YHM

10h 25m1 stop

6:00 am - 10:25 pmYHM-DEN

18h 25m2 stops

$730WestJet

Find Deal

Mon, Oct 13 - Fri, Oct 17

6:15 am - 5:28 amDEN-YKF

21h 13m2 stops

6:20 am - 6:55 pmYKF-DEN

14h 35m2 stops

$880WestJet

Find Deal

Fri, Nov 7 - Mon, Nov 10

Delta flights from Colorado to Region of Ontario

Our best Delta deals on Colorado to Region of Ontario flight tickets

Delta

Oct 11

COS8:09 amColorado Springs

6h 31m

1 stop

YYZ4:40 pmToronto Pearson Intl

Oct 14

YYZ11:52 amToronto Pearson Intl

10h 38m

1 stop

COS8:30 pmColorado Springs

$494

Find similar

Delta

Oct 17

DEN12:55 amDenver Intl

9h 07m

1 stop

YUL12:02 pmMontreal Pierre Elliott Trudeau Intl

Oct 22

YUL6:00 amMontreal Pierre Elliott Trudeau Intl

6h 11m

1 stop

DEN10:11 amDenver Intl

$497

Find similar

Delta

Oct 17

DEN11:40 amDenver Intl

9h 41m

1 stop

YUL11:21 pmMontreal Pierre Elliott Trudeau Intl

Oct 29

YUL7:30 pmMontreal Pierre Elliott Trudeau Intl

16h 22m

1 stop

DEN9:52 amDenver Intl

$498

Find similar

United Airlines flights from Colorado to Region of Ontario

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

United Airlines

Oct 22

DEN6:00 amDenver Intl

8h 43m

1 stop

YOW4:43 pmOttawa

Oct 25

YOW5:15 amOttawa

8h 43m

1 stop

DEN11:58 amDenver Intl

$327

Find similar

United Airlines

Oct 4

DEN7:48 amDenver Intl

11h 47m

1 stop

YOW9:35 pmOttawa

Oct 11

YOW5:25 pmOttawa

6h 35m

1 stop

DEN10:00 pmDenver Intl

$330

Find similar

United Airlines

Oct 7

DEN5:55 pmDenver Intl

14h 03m

1 stop

YOW9:58 amOttawa

Oct 14

YOW5:50 pmOttawa

7h 25m

1 stop

DEN11:15 pmDenver Intl

$331

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 10/16

6:00 am-9:50 pm

1 stop13h 50m

Toronto Pearson Intl

Wed 10/22

12:00 pm-3:59 am

2 stops17h 59m

$286

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 10/16

6:00 am-9:50 pm

1 stop13h 50m

Toronto Pearson Intl

Wed 10/22

9:45 am-3:59 am

1 stop20h 14m

$290

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Wed 10/22

6:00 am-4:43 pm

1 stop8h 43m

Ottawa

Sat 10/25

5:15 am-11:58 am

1 stop8h 43m

$327

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Sat 10/4

7:48 am-9:35 pm

1 stop11h 47m

Ottawa

Sat 10/11

5:25 pm-10:00 pm

1 stop6h 35m

$330

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Sun 10/19

11:15 am-5:00 pm

Nonstop3h 45m

Montreal Pierre Elliott Trudeau Intl

Mon 10/27

5:25 pm-7:55 pm

Nonstop4h 30m

$445

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Sun 10/19

1:25 pm-9:40 pm

1 stop6h 15m

Montreal Pierre Elliott Trudeau Intl

Mon 10/27

5:25 pm-7:55 pm

Nonstop4h 30m

$451

Colorado SpringsToronto

COS - YYZ

COSYYZ

Colorado Springs

Sat 10/11

8:09 am-4:40 pm

1 stop6h 31m

Toronto Pearson Intl

Tue 10/14

11:52 am-8:30 pm

1 stop10h 38m

$494

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Fri 10/17

12:55 am-12:02 pm

1 stop9h 07m

Montreal Pierre Elliott Trudeau Intl

Wed 10/22

6:00 am-10:11 am

1 stop6h 11m

$497

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Mon 10/13

12:15 pm-12:40 am

1 stop10h 25m

Hamilton

Fri 10/17

6:00 am-10:25 pm

2 stops18h 25m

$730

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Fri 11/7

6:15 am-5:28 am

2 stops21h 13m

Toronto Region of Waterloo Intl

Mon 11/10

6:20 am-6:55 pm

2 stops14h 35m

$880

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 Colorado to Region of 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 cheapest month to fly to Region of Ontario?

The month of March is, on average, the cheapest month to fly to Region of Ontario from Colorado, with most prices found around $253. If you aren’t able to travel during the month of March, then book flights to Region of Ontario from Colorado during January instead. Flights to Region of Ontario in January, while not as cheap as those in March, still average around $317.

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

According to our data, Thursday is the cheapest day to fly to Region of Ontario from Colorado. The lowest ticket price found for a Thursday departure recently was $684. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Colorado to Region of Ontario on a Sunday will generally be more expensive and average around $798. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

According to our data, the cheapest time of day to fly to Region of Ontario is in the evening. momondo users have found flights departing from Colorado to Region of Ontario in the evening for as low as $588. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $721.

What is the cheapest Colorado to Ontario flight route?

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

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

You are more likely to see cheaper flights to Region of Ontario from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around $480 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from Colorado for as low as $326 on momondo.

What cabin class options are available on Colorado to Ontario flights?

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

You could potentially save up to 11% on your flight if you consider stops on a Colorado to Region of Ontario flight.

Cheap Colorado to Region of Ontario flight deals and tips

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

Best Price Found	$252
Fastest flight time	3h 05m
Direct flights	Every day
Airports in Region of Ontario	2 airports

The best one-way flight to Region of Ontario from Colorado in the past 72 hours is $252. The best round-trip flight deal from Colorado to Region of Ontario found on momondo in the last 72 hours is $479.

The fastest flight from Colorado to Region of Ontario takes 3h 05m

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

There are 2 airports near Region of Ontario: Montreal Pierre Elliott Trudeau Intl (YUL), Toronto Pearson Intl (YYZ)

Search flight deals

When did momondo last update prices for flights from Colorado to Ontario?
Prices for flights from Colorado to Ontario are updated daily.
How many operators does momondo search for flights from Colorado to Ontario?
As of September 2025, there are 5 operators available to choose from for flights from Colorado to Ontario.
How old do you have to be to fly from Colorado to Ontario?
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 layovers. It is recommended that you verify with the airline you are booking with for travel from Colorado to Ontario.
What documentation or ID do you need to fly to Ontario?
The travel and health documents you'll need for your trip to Ontario 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 license and a passport that is valid for six months after your intended arrival at Ontario. 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 Colorado to Region of Ontario?
Based on momondo bookings for flights between Colorado and Region of Ontario, the leading plane model is Airbus A220-300, making up 31.38% of the total bookings. Other popular models include Airbus A319 with 27.14%, Airbus A320-100/200 with 23.35%, and Boeing 787-9 Dreamliner with 3.61%.

Best airlines flying from Colorado to Region of Ontario

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

Airline	Rating	Free Cancellation	Price
WestJet	PriceFrom $143	Free Cancellation	Rating 7.2 3,105 reviews	Search WestJet flights
Delta	PriceFrom $144	Free Cancellation	Rating 7.9 7,971 reviews	Search Delta flights
United Airlines	PriceFrom $180	Free Cancellation	Rating 7.4 8,922 reviews	Search United Airlines flights
Air Canada	PriceFrom $219	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Colorado to Ontario for you.

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

Flights from Colorado to Ontario with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Colorado to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to Ontario from Colorado. 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 Region of Ontario 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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Find better results for your trip to Ontario

Popular cities in Ontario

Flights to Torontofrom $98

Flights to Vancouverfrom $85

Flights to Montrealfrom $190

Flights to Calgaryfrom $156

Flights to Ottawafrom $202

Flights to Halifaxfrom $184

Flights to Winnipegfrom $182

Flights to Québec Cityfrom $189

Flights to Saskatoonfrom $145

Flights to Kelownafrom $160

Flights to St. John'sfrom $298

Flights to Reginafrom $210

Cheap flights from Colorado to Ontario from $138

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Colorado to Ontario 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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Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

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Delta flights from Colorado to Region of Ontario

Our best Delta deals on Colorado to Region of Ontario flight tickets

United Airlines flights from Colorado to Region of Ontario

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

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How to get the cheapest flight ticket from Colorado to Region of 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 Region of Ontario?

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

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

What is the cheapest Colorado to Ontario flight route?

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

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

What cabin class options are available on Colorado to Ontario flights?

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

You could potentially save up to 11% on your flight if you consider stops on a Colorado to Region of Ontario flight.

What is the cheapest airline that flies from Colorado to Ontario?

United Airlines, WestJet, and Sun Country Air are the most popular carriers operating from Colorado to Ontario

What airlines fly to Region of Ontario?

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

13 flights are operational daily from Colorado to Region of Ontario as of September 2025. The most popular departure time for this route is 11:00AM, with 81% of flights per day taking off at noon.

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

As of September 2025, 95 flights take off from Colorado and land in Region of Ontario 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 is the flight from Colorado to Region of Ontario?

Cheap Colorado to Region of Ontario flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Region of Ontario

When did momondo last update prices for flights from Colorado to Ontario?

How many operators does momondo search for flights from Colorado to Ontario?

How old do you have to be to fly from Colorado to Ontario?

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

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

Best airlines flying from Colorado to Region of Ontario

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

Why use momondo?

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

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

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

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

An easier way to manage your Region of Ontario 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 Ontario

Popular cities in Ontario

Popular flights according to clicks in the last 7 days on momondo