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Cheap flights from Ontario to Colorado from C$ 186

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 27/2. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
28 Feb — 7 Mar1
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 January 2026.

Sun 26/48:00 a.m.
YUL
-
DEN
2 stops25h 00m
Multiple Airlines
Wed 6/512:15 p.m.
DEN
-
YUL
1 stop23h 57m
Multiple Airlines
Deal found 27/1C$ 493
Wed 15/412:30 p.m.
YUL
-
DEN
1 stop13h 29m
American Airlines
Fri 17/45:44 p.m.
DEN
-
YUL
1 stop16h 00m
American Airlines
Deal found 28/1C$ 496
Tue 28/46:45 a.m.
YUL
-
DEN
2 stops15h 16m
Multiple Airlines
Wed 6/512:15 p.m.
DEN
-
YUL
1 stop23h 57m
Multiple Airlines
Deal found 27/1C$ 500
Tue 28/48:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Wed 6/512:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 27/1C$ 501
Mon 9/38:30 a.m.
YYZ
-
DEN
Nonstop3h 53m
Air Canada
Wed 11/38:05 a.m.
DEN
-
YYZ
1 stop11h 32m
Air Canada
Deal found 28/1C$ 513
Sat 28/24:45 p.m.
YYZ
-
DEN
1 stop9h 14m
Alaska Airlines
Mon 2/37:52 p.m.
DEN
-
YYZ
1 stop17h 43m
Alaska Airlines
Deal found 28/1C$ 516
Thu 12/31:00 p.m.
YYZ
-
DEN
1 stop8h 55m
Air Canada
Thu 19/35:30 p.m.
DEN
-
YYZ
Nonstop3h 11m
Air Canada
Deal found 27/1C$ 517
Mon 9/27:10 a.m.
YYZ
-
DEN
1 stop27h 10m
Multiple Airlines
Wed 11/210:29 p.m.
DEN
-
YYZ
1 stop30h 14m
Multiple Airlines
Deal found 28/1C$ 519
Thu 26/25:25 p.m.
YUL
-
DEN
Nonstop4h 30m
Air Canada
Tue 3/311:15 a.m.
DEN
-
YUL
Nonstop3h 43m
Air Canada
Deal found 28/1C$ 521
Thu 19/25:25 p.m.
YUL
-
DEN
Nonstop4h 30m
Air Canada
Tue 24/211:15 a.m.
DEN
-
YUL
Nonstop3h 43m
Air Canada
Deal found 27/1C$ 523
Thu 19/210:10 a.m.
YUL
-
DEN
1 stop8h 30m
Air Canada
Wed 25/28:05 a.m.
DEN
-
YUL
1 stop9h 20m
Air Canada
Deal found 27/1C$ 525
Tue 24/212:30 p.m.
YTZ
-
DEN
1 stop9h 25m
Air Canada
Tue 3/311:15 a.m.
DEN
-
YTZ
1 stop6h 40m
Air Canada
Deal found 27/1C$ 525

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 January 2026.

Round-trip from

C$ 493

One-way from

C$ 186

Popular in

March

Cheapest in

November

Average price

C$ 622

Good round-trip deal

C$ 567 or less

Good one-way deal

C$ 328 or less
26/4-6/5
  • 26/4-6/5
  • 3 total stops
  • 48h 57m total
  • Ontario to Colorado
Search Deals
27/2
  • 27/2
  • 1 total stop
  • 9h 56m 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$ 15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 2026.
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

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Tue 24/2

12:30 p.m.-7:55 p.m.

1 stop9h 25m

Denver Intl

Tue 3/3

11:15 a.m.-7:55 p.m.

1 stop6h 40m

C$ 525

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 26/2

2:50 p.m.-4:40 p.m.

Nonstop3h 50m

Denver Intl

Sun 1/3

5:30 p.m.-10:41 p.m.

Nonstop3h 11m

C$ 529

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 1/4

1:00 p.m.-7:55 p.m.

1 stop8h 55m

Denver Intl

Sun 5/4

6:05 p.m.-11:16 p.m.

Nonstop3h 11m

C$ 534

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sat 28/2

4:45 p.m.-11:38 a.m.

2 stops20h 53m

Denver Intl

Mon 2/3

7:52 p.m.-3:35 p.m.

1 stop17h 43m

C$ 544

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 9/2

4:20 p.m.-8:20 a.m.

1 stop18h 00m

Denver Intl

Mon 2/3

6:21 p.m.-12:39 a.m.

2 stops28h 18m

C$ 565

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 17/5

10:55 p.m.-11:20 a.m.

2 stops14h 25m

Denver Intl

Wed 20/5

12:15 p.m.-5:10 a.m.

2 stops14h 55m

C$ 566

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 19/3

1:30 p.m.-11:54 p.m.

2 stops12h 24m

Denver Intl

Tue 24/3

4:38 p.m.-1:10 p.m.

1 stop18h 32m

C$ 566

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 25/2

4:45 p.m.-10:42 a.m.

2 stops19h 57m

Denver Intl

Wed 4/3

11:38 a.m.-3:35 p.m.

2 stops25h 57m

C$ 569

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 15/3

10:15 p.m.-3:56 a.m.

2 stops31h 41m

Denver Intl

Sun 22/3

7:05 p.m.-6:43 a.m.

1 stop9h 38m

C$ 573

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 12/3

7:15 a.m.-3:56 a.m.

2 stops22h 41m

Denver Intl

Fri 20/3

9:10 a.m.-3:35 p.m.

1 stop28h 25m

C$ 577

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/1

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, September is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 296). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 430). 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 January 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 January 2026.

The most flights from CAON to USCO are scheduled on a Monday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 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 January 2026.
Get a feel of what it's like to fly with United Airlines,WestJet, andAir Canada 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
9,215 reviews
Check prices

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

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
9,215 reviews
United Airlines
7.4
Good
9,215 reviews
Check prices

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

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
3,253 reviews
United Airlines
7.4
Good
9,215 reviews
Check prices

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

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
10,667 reviews
United Airlines
7.4
Good
9,215 reviews
Check prices

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

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 9h 25m. Air Canada provides one of the quickest options available for as low as C$ 525. There are 2128 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.

  • 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$ 168), Air Canada (C$ 268), and United Airlines (C$ 302).

  • 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, September is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 296). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 430). 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 629,999 searches. Data last updated 29 January 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 255AverageC$ 435FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 299AverageC$ 725FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 423AverageC$ 641FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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