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Cheap flights from Ontario to Colorado from C$ 205

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
29 May — 5 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Colorado

Enter your travel dates to find the best prices.

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 29 April 2026.

Mon 22/65:45 p.m.
YUL
-
DEN
2 stops19h 35m
WestJet
Wed 1/712:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 25/4C$ 439
Tue 26/56:45 a.m.
YUL
-
DEN
2 stops30h 35m
WestJet
Tue 2/612:15 p.m.
DEN
-
YUL
2 stops34h 10m
WestJet
Deal found 27/4C$ 442
Fri 21/87:15 a.m.
YUL
-
DEN
1 stop30h 05m
WestJet
Sun 23/812:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 27/4C$ 445
Fri 17/78:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Mon 20/712:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 28/4C$ 446
Wed 2/95:30 p.m.
YUL
-
DEN
1 stop19h 50m
WestJet
Mon 7/912:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 29/4C$ 449
Tue 21/78:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Fri 24/712:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 28/4C$ 450
Tue 26/56:45 a.m.
YUL
-
DEN
2 stops30h 35m
WestJet
Thu 28/512:15 p.m.
DEN
-
YUL
2 stops28h 05m
WestJet
Deal found 29/4C$ 457
Sun 19/78:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Sun 26/712:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 25/4C$ 460
Mon 18/51:20 p.m.
YOW
-
DEN
1 stop24h 00m
WestJet
Wed 20/512:15 p.m.
DEN
-
YOW
2 stops22h 15m
WestJet
Deal found 28/4C$ 460
Thu 18/65:45 p.m.
YUL
-
DEN
2 stops19h 35m
WestJet
Thu 25/612:15 p.m.
DEN
-
YUL
1 stop26h 15m
WestJet
Deal found 28/4C$ 461
Sat 23/56:10 p.m.
YHM
-
DEN
1 stop19h 10m
WestJet
Tue 26/512:15 p.m.
DEN
-
YHM
1 stop27h 00m
WestJet
Deal found 27/4C$ 482
Thu 4/65:45 p.m.
YYZ
-
COS
1 stop6h 37m
Delta
Sun 7/66:00 a.m.
COS
-
YYZ
1 stop9h 19m
Delta
Deal found 28/4C$ 497

Find flight deals from Ontario to Colorado

Keep the following information in mind while searching for Ontario to Colorado flight deals. Data was last updated 29 April 2026.

Round-trip from

C$ 420

One-way from

C$ 205

Popular in

February

Cheapest in

November

Average price

C$ 639

Good round-trip deal

C$ 593 or less

Good one-way deal

C$ 350 or less
WestJet
  • WestJet
  • 9/6-16/6
  • 3 total stops
  • 29h 05m total
  • Ontario to Colorado
Search Deals
27/5
  • 27/5
  • 1 total stop
  • 16h 49m 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).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Colorado.
Search Deals
Price to beat on a one-way flight from Ontario to Colorado.
Search Deals

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 29 April 2026.
Use the filters below to find and compare flights from Ontario to Colorado that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 18/5

1:20 p.m.-11:20 a.m.

1 stop24h 00m

Denver Intl

Wed 20/5

12:15 p.m.-12:30 p.m.

2 stops22h 15m

C$ 460

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Tue 9/6

10:45 a.m.-2:40 p.m.

1 stop5h 55m

Colorado Springs

Sat 13/6

12:56 p.m.-9:32 p.m.

1 stop6h 36m

C$ 497

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 18/6

6:55 a.m.-11:20 a.m.

2 stops30h 25m

Denver Intl

Wed 24/6

12:15 p.m.-12:30 p.m.

2 stops22h 15m

C$ 499

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Fri 9/10

7:20 p.m.-11:20 a.m.

2 stops42h 00m

Denver Intl

Mon 12/10

12:15 p.m.-11:45 p.m.

1 stop9h 30m

C$ 509

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Fri 5/6

1:34 p.m.-9:27 p.m.

1 stop9h 53m

Colorado Springs

Tue 9/6

11:10 a.m.-11:02 p.m.

2 stops9h 52m

C$ 524

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 23/9

4:15 p.m.-11:20 a.m.

1 stop21h 05m

Denver Intl

Sun 27/9

12:15 p.m.-12:30 p.m.

2 stops22h 15m

C$ 527

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Sat 22/8

7:00 a.m.-10:59 a.m.

1 stop5h 59m

Colorado Springs

Sat 29/8

6:00 a.m.-3:14 p.m.

1 stop7h 14m

C$ 528

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Fri 21/8

9:00 p.m.-10:59 a.m.

1 stop15h 59m

Colorado Springs

Mon 24/8

12:51 p.m.-9:32 p.m.

1 stop6h 41m

C$ 528

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Thu 28/5

10:00 a.m.-9:27 p.m.

2 stops13h 27m

Colorado Springs

Thu 4/6

6:00 a.m.-5:15 p.m.

1 stop9h 15m

C$ 530

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 8/7

6:55 a.m.-11:20 a.m.

2 stops30h 25m

Denver Intl

Wed 15/7

12:15 p.m.-12:30 p.m.

2 stops22h 15m

C$ 538

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/4

Showing 1-10 of 60 resultsSorted by cheapest first
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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

How far ahead should I book a flight from Region of Ontario to Colorado?

The price you pay for your flight from Region of Ontario to Colorado may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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$ 178). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 404). 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 29 April 2026.

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 29 April 2026.

The most flights from CAON to USCO are scheduled on a Wednesday (7 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (1 on average).

How much does it cost to fly round-trip from Region of Ontario to Colorado?

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 29 April 2026.
Get a feel of what it's like to fly with United Airlines,WestJet, 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.
United Airlines
7.4
Good
9,677 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,677 reviews
United Airlines
7.4
Good
9,677 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
WestJet
7.2
Good
3,328 reviews
United Airlines
7.4
Good
9,677 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
American Airlines
7.1
Good
11,682 reviews
United Airlines
7.4
Good
9,677 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
Air Canada
7.1
Good
10,982 reviews
United Airlines
7.4
Good
9,677 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

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.

  • How long is the flight from Region of Ontario to Colorado?

    A quick flight from Region of Ontario to Colorado can take about 5h 55m. WestJet provides one of the quickest options available for as low as C$ 497. There are 2155 km between Region of Ontario and Colorado. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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$ 178). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 404). 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

Browse thousands of different options on Cheapflights for your next trip

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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 29 April 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 302AverageC$ 711FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 326AverageC$ 447FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 392AverageC$ 669FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 762AverageC$ 796FlexibilityNo cancel feeOn-time71%
Search American 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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