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Ontario

$96+ Cheap flights from Colorado to Ontario

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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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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 June 12, 2025.

Round-trip from

$248
(Kiwi.com)

One-way from

$96
(Trip.com)

Popular in

November

Cheapest in

March

Average price

$490

Good round-trip deal

$517 or less

Good one-way deal

$203 or less
From Colorado to Ontario
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One-way flight from Colorado to Ontario
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Highest demand for flights based on searches. 4% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 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 June 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/112:15 pmDEN - YYZ
2 stops10h 16mWestJet
Sun 9/710:00 amYYZ - DEN
1 stop10h 48mWestJet
Deal found 6/11$248
This FlightHub deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/1512:15 pmDEN - YUL
1 stop10h 28mWestJet
Tue 7/225:30 pmYUL - DEN
1 stop19h 57mWestJet
Deal found 6/12$276
This Trip.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2112:15 pmDEN - YOW
1 stop10h 26mWestJet
Mon 8/257:15 pmYOW - DEN
1 stop18h 12mWestJet
Deal found 6/10$280
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/112:15 pmDEN - YYZ
2 stops10h 18mMultiple Airlines
Thu 7/39:45 amYYZ - DEN
1 stop15h 23mMultiple Airlines
Deal found 6/10$285
This Trip.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2212:15 pmDEN - YKF
1 stop10h 31mWestJet
Tue 7/297:45 pmYKF - DEN
1 stop17h 42mWestJet
Deal found 6/10$293
This Trip.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/267:50 amDEN - YOW
1 stop11h 45mUnited Airlines
Sat 8/27:29 pmYOW - DEN
1 stop7h 01mUnited Airlines
Deal found 6/11$300
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/1512:15 pmDEN - YUL
1 stop10h 28mMultiple Airlines
Tue 7/223:10 pmYUL - DEN
2 stops14h 50mMultiple Airlines
Deal found 6/10$310
This Mytrip deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/312:15 pmDEN - YKF
1 stop15h 00mMultiple Airlines
Sun 9/76:00 amYKF - DEN
1 stop14h 48mMultiple Airlines
Deal found 6/11$342
This Flightnetwork deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/265:40 pmDEN - YUL
Nonstop3h 46mAir Canada
Wed 7/23:30 pmYUL - DEN
1 stop6h 30mAir Canada
Deal found 6/11$346
This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/237:05 pmDEN - YOW
1 stop11h 14mAir Canada
Sun 7/276:00 amYOW - DEN
1 stop6h 21mAir Canada
Deal found 6/11$353
This SmartFares deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/212:15 pmDEN - YHM
1 stop10h 25mWestJet
Sun 9/76:00 amYHM - DEN
1 stop14h 48mWestJet
Deal found 6/11$355
This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2812:15 pmDEN - YOW
1 stop10h 26mMultiple Airlines
Wed 7/303:45 pmYOW - DEN
2 stops14h 15mMultiple Airlines
Deal found 6/11$371

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 2,558,603 searches. Data last updated June 12, 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 9/1

12:15 pm-12:31 am

2 stops10h 16m

Toronto Pearson Intl

Sun 9/7

10:00 am-6:48 pm

1 stop10h 48m

$248

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 7/15

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 7/22

5:30 pm-11:27 am

1 stop19h 57m

$276

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 8/21

12:15 pm-12:41 am

1 stop10h 26m

Ottawa

Mon 8/25

7:15 pm-11:27 am

1 stop18h 12m

$280

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 7/1

12:15 pm-12:33 am

2 stops10h 18m

Toronto Pearson Intl

Thu 7/3

9:45 am-11:08 pm

1 stop15h 23m

$285

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Tue 7/22

12:15 pm-12:46 am

1 stop10h 31m

Toronto Region of Waterloo Intl

Tue 7/29

7:45 pm-11:27 am

1 stop17h 42m

$293

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Sat 7/26

7:50 am-9:35 pm

1 stop11h 45m

Ottawa

Sat 8/2

7:29 pm-12:30 am

1 stop7h 01m

$300

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 7/15

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 7/22

3:10 pm-4:00 am

2 stops14h 50m

$310

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Wed 9/3

12:15 pm-5:15 am

1 stop15h 00m

Toronto Region of Waterloo Intl

Sun 9/7

6:00 am-6:48 pm

1 stop14h 48m

$342

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Thu 6/26

5:40 pm-11:26 pm

Nonstop3h 46m

Montreal Pierre Elliott Trudeau Intl

Wed 7/2

3:30 pm-8:00 pm

1 stop6h 30m

$346

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Wed 7/23

7:05 pm-8:19 am

1 stop11h 14m

Ottawa

Sun 7/27

6:00 am-10:21 am

1 stop6h 21m

$353

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 56 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 $243). Flying from Colorado to Region of Ontario in July is currently the most expensive (average of $353). 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 June 12, 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 June 12, 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 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 June 12, 2025.
Read through reviews of airlines operating flights from Colorado to Ontario, such as Alaska Airlines, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

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

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

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?

    The cheapest airline one-way is WestJet, with whom users have recently found tickets for as low as $96. However, be on the lookout for offers from United Airlines and Air Canada, as they are both options that can get you from Colorado to Region of Ontario for a low price.

  • 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 $243). Flying from Colorado to Region of Ontario in July is currently the most expensive (average of $353). 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 4 airlines flying from Colorado to Ontario

Discover the top 4 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 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$131Average$586FlexibilityNo cancel feeOn-time67%
WestJetCheapest$143Average$316FlexibilityNo cancel feeOn-time60%
DeltaCheapest$144Average$172FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$277Average$527FlexibilityNo cancel feeOn-time69%

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