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Cheap flights from Ontario to Colorado from C$ 220

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
6 Aug — 13 Aug1
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 1 August 2025.

Round-trip from

C$ 404

One-way from

C$ 245

Popular in

February

Cheapest in

August

Average price

C$ 577

Good round-trip deal

C$ 667 or less

Good one-way deal

C$ 347 or less
WestJet
  • WestJet
  • 6/9-16/9
  • 2 total stops
  • 28h 34m total
  • Ontario to Colorado
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Air Canada
  • Air Canada
  • 3/9
  • Nonstop
  • 4h 13m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 54 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease (C$ 9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 1 August 2025.

Sat 6/97:15 p.m.YOW - DEN
1 stop18h 09mWestJet
Tue 16/912:15 p.m.DEN - YOW
1 stop10h 25mWestJet
Deal found 31/7C$ 404
Sun 23/115:25 p.m.YUL - DEN
Nonstop4h 30mAir Canada
Wed 26/118:45 a.m.DEN - YUL
1 stop10h 15mAir Canada
Deal found 29/7C$ 423
Thu 28/86:45 a.m.YUL - DEN
2 stops30h 42mWestJet
Sun 31/812:15 p.m.DEN - YUL
1 stop10h 28mWestJet
Deal found 31/7C$ 429
Wed 20/89:25 a.m.YOW - DEN
1 stop12h 05mAir Canada
Tue 26/87:45 a.m.DEN - YOW
1 stop7h 20mAir Canada
Deal found 29/7C$ 435
Sun 21/910:25 p.m.YYZ - DEN
1 stop14h 59mWestJet
Tue 23/912:15 p.m.DEN - YYZ
1 stop8h 37mWestJet
Deal found 30/7C$ 436
Sat 27/96:00 a.m.YHM - DEN
1 stop31h 24mMultiple Airlines
Sun 5/1012:15 p.m.DEN - YHM
1 stop31h 04mMultiple Airlines
Deal found 30/7C$ 437
Tue 26/86:20 p.m.YYZ - DEN
Nonstop3h 40mAir Canada
Fri 29/87:45 a.m.DEN - YYZ
Nonstop3h 13mAir Canada
Deal found 30/7C$ 443
Fri 5/97:50 a.m.YTZ - DEN
1 stop12h 36mMultiple Airlines
Mon 8/912:28 p.m.DEN - YTZ
1 stop5h 34mMultiple Airlines
Deal found 29/7C$ 447
Sat 20/96:30 a.m.YYZ - DEN
1 stop5h 04mDelta
Thu 25/912:45 a.m.DEN - YYZ
1 stop8h 35mDelta
Deal found 29/7C$ 448
Tue 23/98:00 a.m.YYZ - DEN
2 stops14h 27mMultiple Airlines
Sun 28/912:15 p.m.DEN - YYZ
1 stop10h 07mMultiple Airlines
Deal found 30/7C$ 450
Thu 21/812:25 p.m.YTZ - DEN
1 stop7h 55mAir Canada
Thu 28/85:40 p.m.DEN - YTZ
1 stop12h 26mAir Canada
Deal found 30/7C$ 461
Mon 25/86:33 a.m.YOW - DEN
1 stop15h 39mUnited Airlines
Sun 31/87:48 a.m.DEN - YOW
1 stop11h 47mUnited Airlines
Deal found 30/7C$ 462

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 1 August 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 6/9

7:15 p.m.-11:24 a.m.

1 stop18h 09m

Denver Intl

Tue 16/9

12:15 p.m.-12:40 a.m.

1 stop10h 25m

C$ 404

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sun 23/11

5:25 p.m.-7:55 p.m.

Nonstop4h 30m

Denver Intl

Wed 26/11

8:45 a.m.-9:00 p.m.

1 stop10h 15m

C$ 423

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Thu 28/8

6:45 a.m.-11:27 a.m.

2 stops30h 42m

Denver Intl

Sun 31/8

12:15 p.m.-12:43 a.m.

1 stop10h 28m

C$ 429

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 20/8

9:25 a.m.-7:30 p.m.

1 stop12h 05m

Denver Intl

Tue 26/8

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

1 stop7h 20m

C$ 435

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 21/9

10:25 p.m.-11:24 a.m.

1 stop14h 59m

Denver Intl

Tue 23/9

12:15 p.m.-10:52 p.m.

1 stop8h 37m

C$ 436

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Sat 27/9

6:00 a.m.-11:24 a.m.

1 stop31h 24m

Denver Intl

Sun 5/10

12:15 p.m.-9:19 p.m.

1 stop31h 04m

C$ 437

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 26/8

6:20 p.m.-8:00 p.m.

Nonstop3h 40m

Denver Intl

Fri 29/8

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

Nonstop3h 13m

C$ 443

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 5/9

7:50 a.m.-6:26 p.m.

1 stop12h 36m

Denver Intl

Mon 8/9

12:28 p.m.-8:02 p.m.

1 stop5h 34m

C$ 447

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 20/9

6:30 a.m.-9:34 a.m.

1 stop5h 04m

Denver Intl

Thu 25/9

12:45 a.m.-11:20 a.m.

1 stop8h 35m

C$ 448

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 23/9

8:00 a.m.-8:27 p.m.

2 stops14h 27m

Denver Intl

Sun 28/9

12:15 p.m.-12:22 a.m.

1 stop10h 07m

C$ 450

Flights are sorted by cheapest round-trip flights first.

Deals found on 31/7

Showing 1-10 of 54 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 1 August 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 1 August 2025.

The most flights from CAON to USCO are scheduled on a Monday (10 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (9 on average).

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 1 August 2025.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican Airlines from Ontario to Colorado by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,900 reviews
Delta
8.0
Very good
7,981 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
WestJet
7.2
Good
2,978 reviews
Delta
8.0
Very good
7,981 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air Canada
7.1
Good
9,851 reviews
Delta
8.0
Very good
7,981 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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 Air Canada (C$ 245), WestJet (C$ 252), and American Airlines (C$ 256).

  • 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 1 August 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 211AverageC$ 341FlexibilityNo cancel feeOn-time62%
Search Frontier flights
WestJetCheapestC$ 244AverageC$ 423FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 339AverageC$ 685FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 340AverageC$ 768FlexibilityNo 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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