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Cheap flights from Colorado to Ontario from C$ 127

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 13/8. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
17 Jun — 24 Jun1
1 adult

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 12 June 2025.

Round-trip from

C$ 339

One-way from

C$ 127

Popular in

November

Cheapest in

March

Average price

C$ 670

Good round-trip deal

C$ 598 or less

Good one-way deal

C$ 334 or less
WestJet
  • WestJet
  • 1/9-7/9
  • 3 total stops
  • 21h 04m total
  • Colorado to Ontario
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WestJet
  • WestJet
  • 13/8
  • 1 total stop
  • 10h 28m total
  • Colorado to Ontario
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 45 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
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Average for round-trip flights in June 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

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 12 June 2025.

Mon 1/912:15 p.m.DEN - YYZ
2 stops10h 16mWestJet
Sun 7/910:00 a.m.YYZ - DEN
1 stop10h 48mWestJet
Deal found 11/6C$ 339
Tue 15/712:15 p.m.DEN - YUL
1 stop10h 28mWestJet
Tue 22/75:30 p.m.YUL - DEN
1 stop19h 57mWestJet
Deal found 12/6C$ 377
Thu 21/812:15 p.m.DEN - YOW
1 stop10h 26mWestJet
Mon 25/87:15 p.m.YOW - DEN
1 stop18h 12mWestJet
Deal found 10/6C$ 383
Tue 1/712:15 p.m.DEN - YYZ
2 stops10h 18mMultiple Airlines
Thu 3/79:45 a.m.YYZ - DEN
1 stop15h 23mMultiple Airlines
Deal found 10/6C$ 390
Tue 22/712:15 p.m.DEN - YKF
1 stop10h 31mWestJet
Tue 29/77:45 p.m.YKF - DEN
1 stop17h 42mWestJet
Deal found 10/6C$ 401
Sat 26/77:50 a.m.DEN - YOW
1 stop11h 45mUnited Airlines
Sat 2/87:29 p.m.YOW - DEN
1 stop7h 01mUnited Airlines
Deal found 11/6C$ 410
Mon 28/77:05 p.m.DEN - YOW
1 stop11h 14mAir Canada
Wed 30/75:15 a.m.YOW - DEN
1 stop7h 05mAir Canada
Deal found 12/6C$ 412
Tue 15/712:15 p.m.DEN - YUL
1 stop10h 28mMultiple Airlines
Tue 22/73:10 p.m.YUL - DEN
2 stops14h 50mMultiple Airlines
Deal found 10/6C$ 424
Mon 28/712:15 p.m.DEN - YOW
1 stop10h 26mMultiple Airlines
Wed 30/75:45 a.m.YOW - DEN
2 stops15h 34mMultiple Airlines
Deal found 12/6C$ 457
Wed 3/912:15 p.m.DEN - YKF
1 stop15h 00mMultiple Airlines
Sun 7/96:00 a.m.YKF - DEN
1 stop14h 48mMultiple Airlines
Deal found 11/6C$ 468
Thu 26/65:40 p.m.DEN - YUL
Nonstop3h 46mAir Canada
Wed 2/73:30 p.m.YUL - DEN
1 stop6h 30mAir Canada
Deal found 11/6C$ 473
Tue 2/912:15 p.m.DEN - YHM
1 stop10h 25mWestJet
Sun 7/96:00 a.m.YHM - DEN
1 stop14h 48mWestJet
Deal found 11/6C$ 485

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 12 June 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

Mon 1/9

12:15 p.m.-12:31 a.m.

2 stops10h 16m

Toronto Pearson Intl

Sun 7/9

10:00 a.m.-6:48 p.m.

1 stop10h 48m

C$ 339

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 15/7

12:15 p.m.-12:43 a.m.

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 22/7

5:30 p.m.-11:27 a.m.

1 stop19h 57m

C$ 377

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 21/8

12:15 p.m.-12:41 a.m.

1 stop10h 26m

Ottawa

Mon 25/8

7:15 p.m.-11:27 a.m.

1 stop18h 12m

C$ 383

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 1/7

12:15 p.m.-12:33 a.m.

2 stops10h 18m

Toronto Pearson Intl

Thu 3/7

9:45 a.m.-11:08 p.m.

1 stop15h 23m

C$ 390

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Tue 22/7

12:15 p.m.-12:46 a.m.

1 stop10h 31m

Toronto Region of Waterloo Intl

Tue 29/7

7:45 p.m.-11:27 a.m.

1 stop17h 42m

C$ 401

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Sat 26/7

7:50 a.m.-9:35 p.m.

1 stop11h 45m

Ottawa

Sat 2/8

7:29 p.m.-12:30 a.m.

1 stop7h 01m

C$ 410

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Mon 28/7

7:05 p.m.-8:19 a.m.

1 stop11h 14m

Ottawa

Wed 30/7

5:15 a.m.-10:20 a.m.

1 stop7h 05m

C$ 412

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 15/7

12:15 p.m.-12:43 a.m.

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 22/7

3:10 p.m.-4:00 a.m.

2 stops14h 50m

C$ 424

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Mon 28/7

12:15 p.m.-12:41 a.m.

1 stop10h 26m

Ottawa

Wed 30/7

5:45 a.m.-7:19 p.m.

2 stops15h 34m

C$ 457

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Wed 3/9

12:15 p.m.-5:15 a.m.

1 stop15h 00m

Toronto Region of Waterloo Intl

Sun 7/9

6:00 a.m.-6:48 p.m.

1 stop14h 48m

C$ 468

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/6

Showing 1-10 of 59 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, January is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of C$ 167). Flying from Colorado to Region of Ontario in July is currently the most expensive (average of C$ 255). 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 12 June 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 12 June 2025.

The most flights from USCO to CAON are scheduled on a Monday (11 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (8 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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 12 June 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta and United Airlines from Colorado to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
WestJet
7.2
Good
2,868 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.

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.

  • 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$ 127. Users have also found prices from C$ 168 and C$ 175 on Air Canada and United Airlines, 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, January is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of C$ 167). Flying from Colorado to Region of Ontario in July is currently the most expensive (average of C$ 255). 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 airline flying from Colorado to Ontario

Discover the top airline 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 12 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 213AverageC$ 811FlexibilityNo 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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