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$112+ 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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$279
(Kiwi.com)

One-way from

$112
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$507

Good round-trip deal

$317 or less

Good one-way deal

$233 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 ($8 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This Kiwi.com deal was found by Cheapflights users on 2/20. 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 4/12:50 pmYOW - DEN
2 stops15h 06mMultiple Airlines
Tue 4/1510:44 pmDEN - YOW
1 stop16h 01mMultiple Airlines
Deal found 2/20$279
This Air Canada deal was found by Cheapflights users on 2/20. 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 5/216:00 amYOW - DEN
1 stop6h 27mAir Canada
Mon 6/27:48 pmDEN - YOW
1 stop10h 35mAir Canada
Deal found 2/20$285
This Air Canada deal was found by Cheapflights users on 2/19. 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.
Thu 4/31:15 pmYUL - COS
2 stops9h 28mAir Canada
Tue 4/88:03 amCOS - YUL
2 stops8h 18mAir Canada
Deal found 2/19$288
This Kiwi.com deal was found by Cheapflights users on 2/20. 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 3/208:00 pmYYZ - DEN
1 stop9h 56mMultiple Airlines
Thu 3/277:39 pmDEN - YYZ
1 stop8h 16mMultiple Airlines
Deal found 2/20$291
This United Airlines deal was found by Cheapflights users on 2/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/38:05 amYUL - COS
1 stop11h 48mUnited Airlines
Tue 4/86:39 pmCOS - YUL
2 stops12h 29mUnited Airlines
Deal found 2/19$313
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/198:45 amYYZ - COS
1 stop11h 09mUnited Airlines
Sat 5/315:30 amCOS - YYZ
1 stop5h 26mUnited Airlines
Deal found 2/20$325
This Kiwi.com deal was found by Cheapflights users on 2/19. 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.
Fri 3/143:50 pmYTZ - DEN
1 stop18h 42mMultiple Airlines
Sat 3/2910:44 pmDEN - YTZ
2 stops18h 09mMultiple Airlines
Deal found 2/19$329
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/15:15 amYOW - DEN
1 stop8h 54mUnited Airlines
Wed 4/91:25 pmDEN - YOW
1 stop6h 10mUnited Airlines
Deal found 2/20$329
This United deal was found by Cheapflights users on 2/19. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/112:20 pmYYZ - COS
2 stops8h 18mMultiple Airlines
Thu 4/106:00 amCOS - YYZ
2 stops14h 36mMultiple Airlines
Deal found 2/19$333
This Air Canada deal was found by Cheapflights users on 2/20. 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.
Fri 3/212:45 pmYYZ - COS
1 stop9h 15mAir Canada
Sun 3/237:30 amCOS - YYZ
2 stops12h 10mAir Canada
Deal found 2/20$346
This Air Canada deal was found by Cheapflights users on 2/20. 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.
Sat 4/2612:15 pmYYZ - DEN
1 stop7h 44mAir Canada
Sat 5/1011:25 amDEN - YYZ
Nonstop3h 10mAir Canada
Deal found 2/20$370
This Delta deal was found by Cheapflights users on 2/19. 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.
Sun 4/610:20 amYYZ - COS
2 stops12h 31mDelta
Sun 4/138:15 amCOS - YYZ
2 stops12h 43mDelta
Deal found 2/19$377

Find flights from Ontario to Colorado within your budget

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 February 20, 2025.

Fly from

Ontario

Fly to

Colorado

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 4/1

2:50 pm-3:56 am

2 stops15h 06m

Denver Intl

Tue 4/15

10:44 pm-4:45 pm

1 stop16h 01m

$279

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 5/21

6:00 am-10:27 am

1 stop6h 27m

Denver Intl

Mon 6/2

7:48 pm-8:23 am

1 stop10h 35m

$285

MontrealColorado Springs

YUL - COS

YULCOS

Montreal Pierre Elliott Trudeau Intl

Thu 4/3

1:15 pm-8:43 pm

2 stops9h 28m

Colorado Springs

Tue 4/8

8:03 am-6:21 pm

2 stops8h 18m

$288

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 3/20

8:00 pm-3:56 am

1 stop9h 56m

Denver Intl

Thu 3/27

7:39 pm-5:55 am

1 stop8h 16m

$291

MontrealColorado Springs

YUL - COS

YULCOS

Montreal Pierre Elliott Trudeau Intl

Thu 4/3

8:05 am-5:53 pm

1 stop11h 48m

Colorado Springs

Tue 4/8

6:39 pm-9:08 am

2 stops12h 29m

$313

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Mon 5/19

8:45 am-5:54 pm

1 stop11h 09m

Colorado Springs

Sat 5/31

5:30 am-12:56 pm

1 stop5h 26m

$325

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 3/14

3:50 pm-8:32 am

1 stop18h 42m

Denver Intl

Sat 3/29

10:44 pm-6:53 pm

2 stops18h 09m

$329

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 4/1

5:15 am-12:09 pm

1 stop8h 54m

Denver Intl

Wed 4/9

1:25 pm-9:35 pm

1 stop6h 10m

$329

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Tue 4/1

12:20 pm-6:38 pm

2 stops8h 18m

Colorado Springs

Thu 4/10

6:00 am-10:36 pm

2 stops14h 36m

$333

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Fri 3/21

2:45 pm-10:00 pm

1 stop9h 15m

Colorado Springs

Sun 3/23

7:30 am-9:40 pm

2 stops12h 10m

$346

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 60 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.

Travel insights for flights from Ontario to Colorado

Get recent, data-driven insights about flights from Ontario to Colorado including ideal travel times, pricing trends, and more.

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 February 20, 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 February 20, 2025.

The most flights from CAON to USCO are scheduled on a Monday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 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 February 20, 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
9,692 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

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
9,692 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

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
8,220 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

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
1,771 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

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
8,766 reviews
Alaska Airlines
8.0
Very good
9,692 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

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
9,692 reviews

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

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 Air Canada, with whom users have recently found tickets for as low as $173. However, be on the lookout for offers from United Airlines 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
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Top 2 airlines flying from Ontario to Colorado

Discover the top 2 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$234Average$427FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$254Average$499FlexibilityNo cancel feeOn-time67%
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