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Cheap flights from Colorado to Ontario from C$ 147

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
28 Nov — 5 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Colorado to Ontario

Keep the following information in mind while searching for Colorado to Ontario flight deals. Data was last updated 29 October 2025.

Round-trip from

C$ 436

One-way from

C$ 147

Popular in

November

Cheapest in

March

Average price

C$ 745

Good round-trip deal

C$ 679 or less

Good one-way deal

C$ 760 or less
11/11-18/11
  • 11/11-18/11
  • 3 total stops
  • 47h 56m total
  • Colorado to Ontario
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20/1
  • 20/1
  • 2 total stops
  • 39h 30m total
  • Colorado to Ontario
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Highest demand for flights based on searches. 6% potential increase in price (C$ 61 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 16 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Colorado to Ontario.
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Price to beat on a one-way flight from Colorado to Ontario.
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Find flight deals from Colorado to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Colorado to Ontario
Explore the most affordable flight options available from Colorado to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 October 2025.

Tue 11/1112:59 a.m.DEN - YYZ
2 stops35h 41mMultiple Airlines
Tue 18/1112:40 p.m.YYZ - DEN
1 stop12h 15mMultiple Airlines
Deal found 28/10C$ 436
Fri 14/1111:04 a.m.DEN - YYZ
1 stop8h 03mMultiple Airlines
Tue 18/1112:40 p.m.YYZ - DEN
1 stop12h 15mMultiple Airlines
Deal found 28/10C$ 449
Sun 16/1112:16 a.m.DEN - YYZ
2 stops18h 51mMultiple Airlines
Wed 19/114:45 p.m.YYZ - DEN
1 stop26h 02mMultiple Airlines
Deal found 28/10C$ 450
Wed 17/1211:59 p.m.DEN - YYZ
1 stop12h 21mMultiple Airlines
Wed 7/17:45 a.m.YYZ - DEN
2 stops36h 58mMultiple Airlines
Deal found 28/10C$ 451
Wed 24/1210:37 p.m.DEN - YYZ
2 stops22h 34mMultiple Airlines
Sun 4/18:00 p.m.YYZ - DEN
1 stop9h 58mMultiple Airlines
Deal found 29/10C$ 454
Fri 14/1111:04 a.m.DEN - YYZ
1 stop8h 03mMultiple Airlines
Thu 20/118:45 p.m.YYZ - DEN
2 stops22h 02mMultiple Airlines
Deal found 28/10C$ 456
Fri 14/1111:04 a.m.DEN - YYZ
1 stop8h 03mMultiple Airlines
Fri 21/118:45 p.m.YYZ - DEN
2 stops22h 02mMultiple Airlines
Deal found 28/10C$ 457
Wed 17/1211:59 p.m.DEN - YYZ
1 stop12h 21mMultiple Airlines
Sun 4/18:00 p.m.YYZ - DEN
1 stop9h 58mMultiple Airlines
Deal found 28/10C$ 460
Thu 4/1211:59 p.m.DEN - YYZ
1 stop22h 12mMultiple Airlines
Sun 7/127:10 a.m.YYZ - DEN
1 stop17h 54mMultiple Airlines
Deal found 28/10C$ 461
Sun 21/126:34 p.m.DEN - YYZ
1 stop10h 13mMultiple Airlines
Tue 6/11:30 p.m.YYZ - DEN
2 stops16h 28mMultiple Airlines
Deal found 28/10C$ 463
Wed 17/1211:59 p.m.DEN - YYZ
1 stop12h 21mMultiple Airlines
Sat 3/17:55 p.m.YYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 27/10C$ 464
Thu 27/116:22 a.m.DEN - YTZ
1 stop10h 33mMultiple Airlines
Thu 4/128:55 a.m.YTZ - DEN
1 stop9h 20mMultiple Airlines
Deal found 28/10C$ 469

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 October 2025.
Use the filters below to find and compare flights from Colorado to Ontario that are best for you.

Fly from

Colorado

Fly to

Ontario

Route

Depart

Return

Price

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 27/11

6:22 a.m.-6:55 p.m.

1 stop10h 33m

Toronto Island

Thu 4/12

8:55 a.m.-4:15 p.m.

1 stop9h 20m

C$ 469

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Sun 9/11

8:05 a.m.-6:57 p.m.

1 stop8h 52m

Toronto Island

Wed 12/11

9:15 a.m.-2:41 p.m.

2 stops31h 26m

C$ 479

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Mon 17/11

8:02 p.m.-3:35 p.m.

1 stop17h 33m

Toronto Pearson Intl

Wed 19/11

4:45 p.m.-11:59 p.m.

1 stop9h 14m

C$ 495

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 14/11

12:16 a.m.-3:27 p.m.

2 stops13h 11m

Toronto Island

Mon 17/11

9:15 a.m.-11:44 p.m.

2 stops16h 29m

C$ 500

Colorado SpringsOttawa

COS - YOW

COSYOW

Colorado Springs

Tue 7/4

6:00 a.m.-4:15 p.m.

2 stops8h 15m

Ottawa

Wed 8/4

6:52 a.m.-11:18 a.m.

1 stop6h 26m

C$ 520

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 25/11

6:22 a.m.-5:25 p.m.

1 stop9h 03m

Ottawa

Tue 2/12

3:55 p.m.-7:09 p.m.

1 stop29h 14m

C$ 531

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Sun 16/11

4:08 p.m.-3:58 p.m.

2 stops21h 50m

Toronto Island

Sun 23/11

2:30 p.m.-9:00 a.m.

1 stop20h 30m

C$ 537

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 5/12

12:59 a.m.-7:50 p.m.

2 stops16h 51m

Toronto Island

Sun 7/12

9:15 a.m.-2:02 p.m.

1 stop6h 47m

C$ 542

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Sat 6/12

11:41 a.m.-3:35 p.m.

2 stops25h 54m

Toronto Pearson Intl

Wed 10/12

4:45 p.m.-12:01 p.m.

2 stops21h 16m

C$ 551

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Sat 21/3

8:45 p.m.-1:42 p.m.

1 stop14h 57m

Toronto Island

Fri 27/3

9:15 a.m.-8:56 a.m.

1 stop25h 41m

C$ 551

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/10

Showing 1-10 of 60 results
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Best time to book a flight from Colorado to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Colorado with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Colorado to Ontario

What is the cheapest month to book a flight from Colorado to Region of Ontario?

Currently, June is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of C$ 180). Flying from Colorado to Region of Ontario in February is currently the most expensive (average of C$ 324). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CO to ON?

Find hourly flight availability from Colorado to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 October 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Region of Ontario as you normally would.

How much does it cost to fly round-trip from Colorado to Region of Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated 29 October 2025.
Read reviews from past customers who have flown United Airlines and Air Canada from Colorado to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,999 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Reviews

1 / 20
6.0
Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.
United Airlines
7.4
Good
8,999 reviews
United Airlines
7.4
Good
8,999 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Reviews

1 / 20
6.0
Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.
Air Canada
7.1
Good
10,372 reviews
United Airlines
7.4
Good
8,999 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Reviews

1 / 20
6.0
Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Airlines like Alaska Airlines, United Airlines, and American Airlines fly from Colorado to Region of Ontario in about 8h 15m. The time it takes to get you to your destination can typically vary by up to 12h 03m. Airlines will cover a distance of 2486 km. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Colorado to Region of Ontario one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as C$ 203. Users have also found prices from C$ 215 and C$ 313 on United Airlines and Delta, respectively.

  • Can I find deals for flights from Colorado to Ontario that include hotel bookings?

    Yes. In addition to deals on Colorado to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Ontario.

  • Can I find deals for business class flights from Colorado to Ontario?

    Yes. Cheapflights offers flight deals from Colorado to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Colorado to Region of Ontario?

    Currently, June is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of C$ 180). Flying from Colorado to Region of Ontario in February is currently the most expensive (average of C$ 324). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Colorado to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Colorado to Ontario

Discover the top 2 airlines that operate flights from Colorado to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 October 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 246AverageC$ 580FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 290AverageC$ 557FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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How does Cheapflights help users find flights from Colorado to Ontario?

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