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Colorado

$143+ Cheap flights from Ontario to Colorado

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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
Apr 5 — Apr 121
Sat 4/5
Sat 4/12
1 adult, Economy
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Cheap flight deals from Ontario to Colorado

Keep the following information in mind while searching for Ontario to Colorado flight deals. Data was last updated March 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$220
(Mytrip)

One-way from

$143
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$485

Good round-trip deal

$342 or less

Good one-way deal

$224 or less
Provider with most accurate pricing for Toronto (YTO)-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Toronto (YTO)-Denver Intl flights.
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From Ontario to Colorado
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One-way flight from Ontario to Colorado
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Highest demand for flights based on searches. 1% potential increase in price ($6 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Ontario to Colorado.
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Price to beat on a one-way flight from Ontario to Colorado.
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Find flight deals from Ontario to Colorado

Cheapest flights from Ontario to Colorado
Explore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 31, 2025.

This Mytrip deal was found by Cheapflights users on 3/30. 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.
Thu 5/225:55 amYOW - DEN
2 stops14h 57mWestJet
Thu 5/297:40 pmDEN - YOW
1 stop9h 05mWestJet
Deal found 3/30$220
This American Airlines deal was found by Cheapflights users on 3/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/75:20 pmYYZ - COS
1 stop8h 25mAmerican Airlines
Sat 5/106:00 amCOS - YYZ
1 stop14h 47mAmerican Airlines
Deal found 3/30$287
This FlightHub deal was found by Cheapflights users on 3/30. 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.
Thu 7/176:00 amYHM - DEN
1 stop14h 52mWestJet
Sun 7/207:40 pmDEN - YHM
1 stop27h 01mWestJet
Deal found 3/30$289
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/77:55 amYYZ - COS
2 stops15h 05mDelta
Sat 5/108:00 amCOS - YYZ
2 stops13h 14mDelta
Deal found 3/30$291
This Kiwi.com deal was found by Cheapflights users on 3/29. 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.
Sun 5/116:40 pmYOW - DEN
1 stop18h 47mMultiple Airlines
Thu 5/227:40 pmDEN - YOW
1 stop9h 05mMultiple Airlines
Deal found 3/29$318
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
Thu 5/2211:00 amYYZ - DEN
1 stop9h 52mMultiple Airlines
Mon 5/268:24 pmDEN - YYZ
1 stop18h 56mMultiple Airlines
Deal found 3/30$351
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Thu 9/118:00 pmYYZ - DEN
1 stop17h 24mWestJet
Mon 9/1512:15 pmDEN - YYZ
1 stop8h 37mWestJet
Deal found 3/31$352
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
Thu 5/83:35 pmYTZ - DEN
1 stop8h 21mMultiple Airlines
Sat 5/1010:52 pmDEN - YTZ
2 stops21h 30mMultiple Airlines
Deal found 3/30$356
This Mytrip deal was found by Cheapflights users on 3/30. 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.
Mon 4/289:25 amYKF - DEN
2 stops28h 02mMultiple Airlines
Mon 5/512:15 pmDEN - YKF
1 stop15h 00mMultiple Airlines
Deal found 3/30$361
This FlightHub deal was found by Cheapflights users on 3/30. 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.
Wed 8/66:45 amYUL - DEN
2 stops30h 42mWestJet
Sat 8/912:15 pmDEN - YUL
2 stops34h 22mWestJet
Deal found 3/30$394
This American Airlines deal was found by Cheapflights users on 3/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/243:40 pmYUL - DEN
1 stop18h 31mAmerican Airlines
Sat 7/57:01 amDEN - YUL
1 stop13h 43mAmerican Airlines
Deal found 3/30$403
This Air Canada deal was found by Cheapflights users on 3/30. 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 5/78:05 amYUL - DEN
Nonstop4h 22mAir Canada
Wed 5/145:40 pmDEN - YUL
Nonstop3h 46mAir Canada
Deal found 3/30$404

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Colorado 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 March 31, 2025.
Use the filters below to find and compare flights from Ontario to Colorado that are best for you.

Fly from

Ontario

Fly to

Colorado

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 5/22

5:55 am-6:52 pm

2 stops14h 57m

Denver Intl

Thu 5/29

7:40 pm-6:45 am

1 stop9h 05m

$220

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Wed 5/7

5:20 pm-11:45 pm

1 stop8h 25m

Colorado Springs

Sat 5/10

6:00 am-10:47 pm

1 stop14h 47m

$287

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Thu 7/17

6:00 am-6:52 pm

1 stop14h 52m

Denver Intl

Sun 7/20

7:40 pm-12:41 am

1 stop27h 01m

$289

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Wed 5/7

1:25 pm-9:00 pm

1 stop9h 35m

Colorado Springs

Sat 5/10

8:00 am-11:14 pm

2 stops13h 14m

$291

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sun 5/11

6:40 pm-11:27 am

1 stop18h 47m

Denver Intl

Thu 5/22

7:40 pm-6:45 am

1 stop9h 05m

$318

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 5/22

11:00 am-6:52 pm

1 stop9h 52m

Denver Intl

Mon 5/26

8:24 pm-5:20 pm

1 stop18h 56m

$351

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 9/11

8:00 pm-11:24 am

1 stop17h 24m

Denver Intl

Mon 9/15

12:15 pm-10:52 pm

1 stop8h 37m

$352

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 5/1

3:35 pm-9:56 pm

1 stop8h 21m

Denver Intl

Mon 5/5

3:42 pm-12:22 pm

1 stop18h 40m

$356

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 5/22

6:00 am-6:52 pm

1 stop14h 52m

Denver Intl

Thu 5/29

12:15 pm-5:15 am

1 stop15h 00m

$360

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Wed 8/6

6:45 am-11:27 am

2 stops30h 42m

Denver Intl

Sat 8/9

12:15 pm-12:37 am

2 stops34h 22m

$394

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 57 results
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Best time to book a flight from Ontario to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from Ontario 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 Ontario to Colorado

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

Currently, October is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of $197). Flying from Region of Ontario to Colorado in March is currently the most expensive (average of $278). 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 ON to CO?

Find hourly flight availability from Ontario to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 31, 2025.

When flying from Region of Ontario to Colorado, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Region of Ontario to Colorado

Explore weekly flight availability from Ontario to Colorado. 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 March 31, 2025.

The most flights from CAON to USCO are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Colorado by month

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

In terms of precipitation, rainfall in Colorado ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Colorado when rainfall is around 0.5 in.

Temperature in Colorado by month

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

If weather is an important factor for your trip to Colorado, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Colorado

Get insights into the airlines that provide service to Colorado. 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 Colorado. Reviews last updated March 31, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and Aeromexico from Ontario to Colorado. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Aeromexico
7.5
Good
1,700 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,614 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Related info for your journey

Find useful and relevant information for your journey from Ontario to Colorado. 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 Region of Ontario to Colorado one-way?

    The cheapest airline one-way is WestJet, with whom users have recently found tickets for as low as $158. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from Region of Ontario to Colorado for a low price.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Colorado 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 Region of Ontario to Colorado?

    Currently, October is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of $197). Flying from Region of Ontario to Colorado in March is currently the most expensive (average of $278). 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 Ontario to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to Newark flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
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Top 3 airlines flying from Ontario to Colorado

Discover the top 3 airlines that operate flights from Ontario to Colorado. 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 March 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$234Average$468FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$254Average$558FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$429Average$517FlexibilityNo cancel feeOn-time71%
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