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Colorado

$152+ 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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$259
(SmartFares)

One-way from

$152
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$440

Good round-trip deal

$397 or less

Good one-way deal

$197 or less
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. 4% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 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 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 junio 12, 2025.

This SmartFares 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/237:15 pmYOW - DEN
1 stop18h 12mWestJet
lun. 7/2812:15 pmDEN - YOW
1 stop10h 26mWestJet
Deal found 6/10$259
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 7/55:50 pmYOW - DEN
1 stop7h 39mUnited Airlines
sáb. 7/1211:54 pmDEN - YOW
1 stop7h 17mUnited Airlines
Deal found 6/10$267
This oojo deal was found by Cheapflights users on 6/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/87:00 pmYYZ - DEN
2 stops18h 27mWestJet
lun. 8/1112:15 pmDEN - YYZ
1 stop8h 39mWestJet
Deal found 6/9$274
This Kissandfly.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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/82:48 pmYOW - DEN
1 stop8h 29mLufthansa
mar. 7/155:59 pmDEN - YOW
2 stops13h 12mLufthansa
Deal found 6/10$287
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/110:00 amYYZ - DEN
2 stops15h 21mMultiple Airlines
dom. 8/312:15 pmDEN - YYZ
1 stop10h 09mMultiple Airlines
Deal found 6/12$303
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/47:45 pmYKF - DEN
1 stop17h 39mWestJet
lun. 9/812:15 pmDEN - YKF
1 stop28h 40mWestJet
Deal found 6/10$305
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/246:00 amYOW - DEN
1 stop6h 21mAir Canada
jue. 8/287:45 amDEN - YOW
1 stop7h 20mAir Canada
Deal found 6/10$309
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.
mié. 6/188:40 amYYZ - DEN
Nonstop3h 40mAir Canada
sáb. 6/217:45 amDEN - YYZ
Nonstop3h 13mAir Canada
Deal found 6/11$313
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/266:49 amYYZ - COS
1 stop17h 33mAmerican Airlines
mié. 7/25:00 amCOS - YYZ
1 stop15h 50mAmerican Airlines
Deal found 6/12$336
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 6/249:00 pmYYZ - COS
1 stop16h 08mUnited Airlines
mar. 7/13:35 pmCOS - YYZ
1 stop5h 13mUnited Airlines
Deal found 6/10$337
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 6/131:25 pmYYZ - DEN
1 stop10h 53mAmerican Airlines
mar. 6/177:00 amDEN - YYZ
1 stop5h 55mAmerican Airlines
Deal found 6/10$338
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 6/132:27 pmYYZ - DEN
1 stop8h 08mDelta
mar. 6/1712:55 amDEN - YYZ
1 stop6h 26mDelta
Deal found 6/10$339

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 junio 12, 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

mié. 7/23

7:15 pm-11:27 am

1 stop18h 12m

Denver Intl

lun. 7/28

12:15 pm-12:41 am

1 stop10h 26m

$259

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

sáb. 7/5

5:50 pm-11:29 pm

1 stop7h 39m

Denver Intl

sáb. 7/12

11:54 pm-9:11 am

1 stop7h 17m

$267

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

vie. 8/8

7:00 pm-11:27 am

2 stops18h 27m

Denver Intl

lun. 8/11

12:15 pm-10:54 pm

1 stop8h 39m

$274

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

mar. 7/8

2:48 pm-9:17 pm

1 stop8h 29m

Denver Intl

mar. 7/15

5:59 pm-9:11 am

2 stops13h 12m

$287

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

vie. 8/1

10:00 am-11:21 pm

2 stops15h 21m

Denver Intl

dom. 8/3

12:15 pm-12:24 am

1 stop10h 09m

$303

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

jue. 9/4

7:45 pm-11:24 am

1 stop17h 39m

Denver Intl

lun. 9/8

12:15 pm-6:55 pm

1 stop28h 40m

$305

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

dom. 8/24

6:00 am-10:21 am

1 stop6h 21m

Denver Intl

jue. 8/28

7:45 am-5:05 pm

1 stop7h 20m

$309

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

mié. 6/18

8:40 am-10:20 am

Nonstop3h 40m

Denver Intl

sáb. 6/21

7:45 am-12:58 pm

Nonstop3h 13m

$313

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

jue. 6/26

6:49 am-10:22 pm

1 stop17h 33m

Colorado Springs

mié. 7/2

5:00 am-10:50 pm

1 stop15h 50m

$336

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

mar. 6/24

9:00 pm-11:08 am

1 stop16h 08m

Colorado Springs

mar. 7/1

3:35 pm-10:48 pm

1 stop5h 13m

$337

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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.

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 junio 12, 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 junio 12, 2025.

The most flights from CAON to USCO are scheduled on a Monday (10 on average). You will have fewer flight options on Friday, 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 junio 12, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and United Airlines 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
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
WestJet
7.2
Good
2,868 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 $152. However, be on the lookout for offers from United Airlines and Air Canada, 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.
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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$229Average$377FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$234Average$479FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$249Average$478FlexibilityNo cancel feeOn-time67%

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