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Cheap flights from Colorado to Ontario from C$ 143

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 29/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
14 Jan — 21 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap 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 15 December 2025.

Tue 23/129:26 p.m.DEN - YYZ
2 stops14h 54mMultiple Airlines
Wed 7/13:15 p.m.YYZ - DEN
1 stop12h 08mMultiple Airlines
Deal found 13/12C$ 633
Wed 24/125:51 p.m.DEN - YYZ
2 stops25h 28mMultiple Airlines
Wed 7/16:20 p.m.YYZ - DEN
1 stop9h 03mMultiple Airlines
Deal found 13/12C$ 653
Wed 31/128:45 p.m.DEN - YUL
2 stops24h 00mMultiple Airlines
Mon 5/15:10 p.m.YUL - DEN
1 stop10h 13mMultiple Airlines
Deal found 13/12C$ 669
Mon 22/126:00 a.m.DEN - YOW
2 stops16h 25mMultiple Airlines
Wed 7/19:30 a.m.YOW - DEN
1 stop10h 03mMultiple Airlines
Deal found 13/12C$ 676
Tue 23/129:26 p.m.DEN - YOW
2 stops17h 47mMultiple Airlines
Wed 7/19:30 a.m.YOW - DEN
1 stop10h 03mMultiple Airlines
Deal found 13/12C$ 688
Wed 24/122:42 p.m.DEN - YOW
2 stops24h 28mMultiple Airlines
Wed 7/19:30 a.m.YOW - DEN
1 stop10h 03mMultiple Airlines
Deal found 13/12C$ 691
Tue 30/1211:05 a.m.DEN - YUL
1 stop11h 35mMultiple Airlines
Wed 7/18:55 a.m.YUL - DEN
2 stops18h 28mMultiple Airlines
Deal found 13/12C$ 695
Mon 22/1211:59 p.m.DEN - YYZ
1 stop9h 44mMultiple Airlines
Wed 7/112:30 p.m.YYZ - DEN
2 stops17h 28mMultiple Airlines
Deal found 13/12C$ 695
Tue 30/1211:05 a.m.DEN - YUL
1 stop11h 35mMultiple Airlines
Mon 5/15:10 p.m.YUL - DEN
1 stop24h 23mMultiple Airlines
Deal found 13/12C$ 698
Tue 23/129:26 p.m.DEN - YYZ
2 stops14h 54mMultiple Airlines
Mon 5/13:15 p.m.YYZ - DEN
1 stop12h 08mMultiple Airlines
Deal found 13/12C$ 719
Tue 23/129:26 p.m.DEN - YYZ
2 stops14h 54mMultiple Airlines
Tue 6/18:20 p.m.YYZ - DEN
1 stop15h 30mMultiple Airlines
Deal found 13/12C$ 720
Wed 24/1210:33 a.m.DEN - YYZ
2 stops25h 47mMultiple Airlines
Thu 1/19:35 a.m.YYZ - DEN
1 stop20h 23mMultiple Airlines
Deal found 15/12C$ 726

Find flight deals from Colorado to Ontario

Keep the following information in mind while searching for Colorado to Ontario flight deals. Data was last updated 15 December 2025.

Round-trip from

C$ 322

One-way from

C$ 143

Popular in

December

Cheapest in

March

Average price

C$ 810

Good round-trip deal

C$ 246 or less
22/1-2/2
  • 22/1-2/2
  • 3 total stops
  • 42h 15m total
  • Colorado to Ontario
Search Deals
29/1
  • 29/1
  • 2 total stops
  • 15h 20m total
  • Colorado to Ontario
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 8 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Colorado to Ontario.
Search Deals

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 15 December 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 - YYZ

DENYYZ

Denver Intl

Thu 22/1

10:29 p.m.-7:42 p.m.

1 stop19h 13m

Toronto Pearson Intl

Mon 2/2

1:30 p.m.-10:32 a.m.

2 stops23h 02m

C$ 322

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 29/1

7:10 a.m.-6:47 a.m.

1 stop21h 37m

Toronto Pearson Intl

Thu 5/2

1:30 p.m.-9:01 a.m.

2 stops21h 31m

C$ 369

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 23/1

6:37 p.m.-6:47 a.m.

1 stop10h 10m

Toronto Pearson Intl

Sun 1/2

8:00 p.m.-11:20 a.m.

2 stops17h 20m

C$ 414

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 27/1

10:40 a.m.-5:13 p.m.

1 stop28h 33m

Ottawa

Tue 3/2

7:00 a.m.-12:03 p.m.

2 stops31h 03m

C$ 416

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 15/1

9:50 a.m.-5:25 p.m.

1 stop29h 35m

Ottawa

Wed 21/1

7:00 a.m.-4:22 p.m.

2 stops11h 22m

C$ 467

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 15/1

9:50 a.m.-10:40 p.m.

1 stop10h 50m

Toronto Pearson Intl

Sun 18/1

7:15 a.m.-8:47 p.m.

2 stops15h 32m

C$ 508

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 6/2

5:09 p.m.-3:35 p.m.

1 stop20h 26m

Toronto Pearson Intl

Sun 8/2

4:45 p.m.-11:35 p.m.

1 stop32h 50m

C$ 514

Colorado SpringsOttawa

COS - YOW

COSYOW

Colorado Springs

Sat 10/1

5:50 a.m.-6:52 p.m.

2 stops11h 02m

Ottawa

Tue 13/1

9:45 a.m.-10:06 p.m.

2 stops14h 21m

C$ 520

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 29/1

6:00 a.m.-12:25 a.m.

2 stops16h 25m

Ottawa

Thu 5/2

4:20 p.m.-8:30 a.m.

1 stop18h 10m

C$ 523

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 15/1

9:50 a.m.-10:10 p.m.

1 stop10h 20m

Toronto Island

Sun 18/1

8:50 a.m.-4:22 p.m.

1 stop9h 32m

C$ 538

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/12

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$ 178). Flying from Colorado to Region of Ontario in February is currently the most expensive (average of C$ 319). 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 15 December 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.

Weekly flight availability from Colorado to Region of Ontario

Explore weekly flight availability from Colorado to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 15 December 2025.

The most flights from USCO to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).

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 15 December 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
9,092 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

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
9,092 reviews
United Airlines
7.4
Good
9,092 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

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
10,525 reviews
United Airlines
7.4
Good
9,092 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

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 Air Canada fly from Colorado to Region of Ontario in about 8h 20m. The time it takes to get you to your destination can typically vary by up to 12h 06m. Airlines will cover a distance of 2128 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 WestJet. According to our data, you can fly for as low as C$ 73. Users have also found prices from C$ 228 and C$ 238 on United Airlines and Air Canada, 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$ 178). Flying from Colorado to Region of Ontario in February is currently the most expensive (average of C$ 319). 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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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 15 December 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 243AverageC$ 571FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 286AverageC$ 549FlexibilityNo 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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