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Cheap flights from Ontario to Colorado from C$ 210

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 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
12 Apr — 19 Apr1
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 13 March 2026.

Fri 10/412:30 p.m.
YUL
-
DEN
1 stop13h 29m
American Airlines
Mon 13/45:30 a.m.
DEN
-
YUL
1 stop7h 14m
American Airlines
Deal found 11/3C$ 399
Fri 1/53:45 p.m.
YUL
-
DEN
1 stop10h 00m
American Airlines
Thu 7/55:30 a.m.
DEN
-
YUL
1 stop7h 14m
American Airlines
Deal found 12/3C$ 405
Tue 31/33:45 p.m.
YUL
-
DEN
1 stop8h 52m
American Airlines
Wed 15/46:30 p.m.
DEN
-
YUL
1 stop18h 14m
American Airlines
Deal found 11/3C$ 416
Thu 9/47:29 a.m.
YUL
-
DEN
1 stop15h 02m
American Airlines
Sun 12/45:30 a.m.
DEN
-
YUL
1 stop7h 14m
American Airlines
Deal found 11/3C$ 418
Mon 6/47:30 a.m.
YUL
-
DEN
1 stop16h 06m
American Airlines
Mon 13/45:44 p.m.
DEN
-
YUL
1 stop16h 00m
American Airlines
Deal found 13/3C$ 469
Sat 21/37:12 a.m.
YUL
-
DEN
1 stop13h 46m
American Airlines
Mon 23/311:59 p.m.
DEN
-
YUL
1 stop20h 45m
American Airlines
Deal found 12/3C$ 479
Sat 2/51:03 p.m.
YUL
-
DEN
2 stops12h 56m
American Airlines
Thu 7/55:30 a.m.
DEN
-
YUL
1 stop7h 14m
American Airlines
Deal found 12/3C$ 488
Fri 20/312:59 p.m.
YUL
-
DEN
1 stop10h 37m
American Airlines
Tue 24/39:30 a.m.
DEN
-
YUL
1 stop11h 14m
American Airlines
Deal found 11/3C$ 491
Wed 22/410:00 a.m.
YYZ
-
DEN
1 stop11h 49m
Multiple Airlines
Tue 28/411:59 p.m.
DEN
-
YYZ
2 stops20h 11m
Multiple Airlines
Deal found 10/3C$ 507
Sat 19/92:48 p.m.
YOW
-
COS
2 stops11h 01m
United Airlines
Sat 26/95:13 p.m.
COS
-
YOW
2 stops18h 32m
United Airlines
Deal found 9/3C$ 510
Wed 22/49:25 a.m.
YTZ
-
DEN
2 stops15h 04m
Multiple Airlines
Tue 28/44:36 p.m.
DEN
-
YTZ
1 stop18h 34m
Multiple Airlines
Deal found 10/3C$ 512
Thu 7/51:30 p.m.
YYZ
-
DEN
2 stops32h 41m
Multiple Airlines
Thu 14/59:00 p.m.
DEN
-
YYZ
1 stop12h 47m
Multiple Airlines
Deal found 10/3C$ 514

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 13 March 2026.

Round-trip from

C$ 399

One-way from

C$ 210

Popular in

February

Cheapest in

November

Average price

C$ 646

Good round-trip deal

C$ 568 or less

Good one-way deal

C$ 333 or less
American Airlines
  • American Airlines
  • 10/4-13/4
  • 2 total stops
  • 20h 43m total
  • Ontario to Colorado
Search Deals
21/4
  • 21/4
  • 3 total stops
  • 16h 39m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 13 March 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

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Fri 1/5

3:45 p.m.-11:45 p.m.

1 stop10h 00m

Denver Intl

Thu 7/5

5:30 a.m.-2:44 p.m.

1 stop7h 14m

C$ 405

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Sat 11/4

6:25 a.m.-2:30 p.m.

2 stops10h 05m

Colorado Springs

Wed 15/4

1:33 p.m.-1:36 a.m.

2 stops10h 03m

C$ 535

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Tue 14/4

12:16 p.m.-8:20 p.m.

2 stops10h 04m

Colorado Springs

Sat 18/4

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

1 stop9h 00m

C$ 543

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Tue 14/4

2:45 p.m.-9:57 p.m.

2 stops9h 12m

Colorado Springs

Sat 18/4

7:00 a.m.-4:56 p.m.

2 stops7h 56m

C$ 543

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Sat 11/4

6:25 a.m.-10:57 a.m.

1 stop6h 32m

Colorado Springs

Wed 15/4

11:42 a.m.-9:35 p.m.

1 stop7h 53m

C$ 555

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Wed 15/4

6:10 a.m.-2:36 p.m.

2 stops10h 26m

Colorado Springs

Mon 20/4

1:33 p.m.-9:32 p.m.

1 stop5h 59m

C$ 561

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Sat 25/4

7:55 a.m.-8:20 p.m.

2 stops14h 25m

Colorado Springs

Sat 2/5

7:59 a.m.-11:59 p.m.

2 stops14h 00m

C$ 562

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Wed 6/5

12:16 p.m.-8:20 p.m.

2 stops10h 04m

Colorado Springs

Mon 11/5

1:55 p.m.-11:58 p.m.

1 stop8h 03m

C$ 562

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Mon 20/4

6:00 a.m.-7:42 p.m.

1 stop15h 42m

Denver Intl

Tue 21/4

11:55 p.m.-5:39 p.m.

1 stop15h 44m

C$ 577

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Mon 1/6

8:40 p.m.-11:20 a.m.

1 stop16h 40m

Denver Intl

Wed 10/6

12:15 p.m.-7:50 p.m.

1 stop29h 35m

C$ 592

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/3

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

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$ 297). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 522). 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 13 March 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 13 March 2026.

The most flights from CAON to USCO are scheduled on a Monday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 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 13 March 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
9,418 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

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
9,418 reviews
United Airlines
7.4
Good
9,418 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

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
3,292 reviews
United Airlines
7.4
Good
9,418 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

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
11,448 reviews
United Airlines
7.4
Good
9,418 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

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
10,800 reviews
United Airlines
7.4
Good
9,418 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

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 10h. American Airlines provides one of the quickest options available for as low as C$ 405. There are 2585 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$ 169), Air Canada (C$ 269), and United Airlines (C$ 299).

  • 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$ 297). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 522). 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 13 March 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 253AverageC$ 435FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 300AverageC$ 694FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 380AverageC$ 671FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 763AverageC$ 791FlexibilityNo 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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