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Cheap flights from Ontario to Colorado from C$ 208

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 16/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
17 Jun — 24 Jun1
1 adult

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 12 June 2025.

Round-trip from

C$ 350

One-way from

C$ 208

Popular in

December

Cheapest in

September

Average price

C$ 602

Good round-trip deal

C$ 559 or less

Good one-way deal

C$ 281 or less
WestJet
  • WestJet
  • 9/8-11/8
  • 2 total stops
  • 28h 38m total
  • Ontario to Colorado
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WestJet
  • WestJet
  • 16/8
  • 1 total stop
  • 19h 57m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 12 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 12 June 2025.

Sat 9/87:15 p.m.YOW - DEN
1 stop18h 12mWestJet
Mon 11/812:15 p.m.DEN - YOW
1 stop10h 26mWestJet
Deal found 12/6C$ 350
Sat 5/75:50 p.m.YOW - DEN
1 stop7h 39mUnited Airlines
Sat 12/711:54 p.m.DEN - YOW
1 stop7h 17mUnited Airlines
Deal found 10/6C$ 365
Fri 8/87:00 p.m.YYZ - DEN
2 stops18h 27mWestJet
Mon 11/812:15 p.m.DEN - YYZ
1 stop8h 39mWestJet
Deal found 9/6C$ 375
Tue 8/72:48 p.m.YOW - DEN
1 stop8h 29mLufthansa
Tue 15/75:59 p.m.DEN - YOW
2 stops13h 12mLufthansa
Deal found 10/6C$ 392
Fri 1/810:00 a.m.YYZ - DEN
2 stops15h 21mMultiple Airlines
Sun 3/812:15 p.m.DEN - YYZ
1 stop10h 09mMultiple Airlines
Deal found 12/6C$ 414
Thu 4/97:45 p.m.YKF - DEN
1 stop17h 39mWestJet
Mon 8/912:15 p.m.DEN - YKF
1 stop28h 40mWestJet
Deal found 10/6C$ 417
Sun 24/86:00 a.m.YOW - DEN
1 stop6h 21mAir Canada
Thu 28/87:45 a.m.DEN - YOW
1 stop7h 20mAir Canada
Deal found 10/6C$ 422
Wed 18/68:40 a.m.YYZ - DEN
Nonstop3h 40mAir Canada
Sat 21/67:45 a.m.DEN - YYZ
Nonstop3h 13mAir Canada
Deal found 11/6C$ 428
Thu 26/66:49 a.m.YYZ - COS
1 stop17h 33mAmerican Airlines
Wed 2/75:00 a.m.COS - YYZ
1 stop15h 50mAmerican Airlines
Deal found 12/6C$ 459
Tue 24/69:00 p.m.YYZ - COS
1 stop16h 08mUnited Airlines
Tue 1/712:55 p.m.COS - YYZ
2 stops9h 03mUnited Airlines
Deal found 10/6C$ 461
Fri 13/61:25 p.m.YYZ - DEN
1 stop10h 53mAmerican Airlines
Tue 17/67:00 a.m.DEN - YYZ
1 stop5h 55mAmerican Airlines
Deal found 10/6C$ 462
Fri 13/62:27 p.m.YYZ - DEN
1 stop8h 08mDelta
Tue 17/612:55 a.m.DEN - YYZ
1 stop6h 26mDelta
Deal found 10/6C$ 463

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 629,999 searches. Data last updated 12 June 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

Sat 9/8

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

1 stop18h 12m

Denver Intl

Mon 11/8

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

1 stop10h 26m

C$ 350

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sat 5/7

5:50 p.m.-11:29 p.m.

1 stop7h 39m

Denver Intl

Sat 12/7

11:54 p.m.-9:11 a.m.

1 stop7h 17m

C$ 365

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 8/8

7:00 p.m.-11:27 a.m.

2 stops18h 27m

Denver Intl

Mon 11/8

12:15 p.m.-10:54 p.m.

1 stop8h 39m

C$ 375

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 8/7

2:48 p.m.-9:17 p.m.

1 stop8h 29m

Denver Intl

Tue 15/7

5:59 p.m.-9:11 a.m.

2 stops13h 12m

C$ 392

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Fri 1/8

10:00 a.m.-11:21 p.m.

2 stops15h 21m

Denver Intl

Sun 3/8

12:15 p.m.-12:24 a.m.

1 stop10h 09m

C$ 414

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 4/9

7:45 p.m.-11:24 a.m.

1 stop17h 39m

Denver Intl

Mon 8/9

12:15 p.m.-6:55 p.m.

1 stop28h 40m

C$ 417

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Sun 24/8

6:00 a.m.-10:21 a.m.

1 stop6h 21m

Denver Intl

Thu 28/8

7:45 a.m.-5:05 p.m.

1 stop7h 20m

C$ 422

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 16/7

8:40 a.m.-10:20 a.m.

Nonstop3h 40m

Denver Intl

Tue 22/7

7:45 a.m.-12:58 p.m.

Nonstop3h 13m

C$ 438

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Thu 26/6

6:49 a.m.-10:22 p.m.

1 stop17h 33m

Colorado Springs

Wed 2/7

5:00 a.m.-10:50 p.m.

1 stop15h 50m

C$ 459

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Tue 24/6

9:00 p.m.-11:08 a.m.

1 stop16h 08m

Colorado Springs

Tue 1/7

12:55 p.m.-11:58 p.m.

2 stops9h 03m

C$ 461

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 59 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, August is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 320). Flying from Region of Ontario to Colorado in December is currently the most expensive (average of C$ 484). 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 12 June 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 12 June 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 13.0 - 58.0 mm per month. May is typically the wettest month, when rainfall can reach 58.0 mm. January is typically the driest time to visit Colorado when rainfall is around 13.0 mm.

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 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).

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 12 June 2025.
See what other customers who have flown with Alaska Airlines, Delta and Brussels Airlines from Ontario to Colorado have to say. 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
Check prices

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

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
Check prices

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

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
Check prices

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Brussels Airlines
7.4
Good
355 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

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
Check prices

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

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
Check prices

Overall

8.0

Entertainment

7.1

Food

7.1

Boarding

8.1

Comfort

7.8

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 airlines for a one-way flight from Region of Ontario to Colorado are WestJet (C$ 208), United Airlines (C$ 220), and Air Canada (C$ 223).

  • 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, August is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 320). Flying from Region of Ontario to Colorado in December is currently the most expensive (average of C$ 484). 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 4 airlines flying from Ontario to Colorado

Discover the top 4 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 629,999 searches. Data last updated 12 June 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 209AverageC$ 337FlexibilityNo cancel feeOn-time62%
Search Frontier flights
WestJetCheapestC$ 239AverageC$ 382FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 319AverageC$ 671FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 336AverageC$ 763FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Colorado?

Cheapflights makes it easy to find Ontario to Colorado flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Colorado?

Cheapflights helps you find that perfect flight to Colorado from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ontario to Colorado with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to Colorado, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Ontario to Colorado become cheaper?

Yes! Start tracking prices for Ontario to Colorado flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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