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Cheap flights from Ontario to Colorado from C$ 216

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 21/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
12 Jul — 19 Jul1
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 12 June 2026.

Fri 21/86:30 p.m.
YUL
-
DEN
1 stop29h 14m
United Airlines
Sun 23/89:40 a.m.
DEN
-
YUL
Nonstop3h 48m
United Airlines
Deal found 10/6C$ 468
Wed 5/88:00 a.m.
YYZ
-
DEN
1 stop29h 20m
WestJet
Tue 11/812:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Deal found 8/6C$ 469
Fri 21/87:15 a.m.
YUL
-
DEN
1 stop30h 05m
WestJet
Tue 25/812:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 8/6C$ 471
Wed 9/98:40 p.m.
YTZ
-
DEN
1 stop18h 20m
Multiple Airlines
Tue 15/95:56 p.m.
DEN
-
YTZ
1 stop18h 29m
Multiple Airlines
Deal found 8/6C$ 482
Thu 20/82:50 p.m.
YYZ
-
DEN
1 stop22h 30m
WestJet
Thu 27/812:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Deal found 8/6C$ 485
Tue 28/712:55 p.m.
YYZ
-
DEN
1 stop10h 46m
Multiple Airlines
Fri 31/710:15 a.m.
DEN
-
YYZ
1 stop8h 35m
Multiple Airlines
Deal found 11/6C$ 497
Mon 24/88:35 p.m.
YYZ
-
DEN
1 stop9h 23m
Multiple Airlines
Tue 25/87:26 p.m.
DEN
-
YYZ
1 stop9h 13m
Multiple Airlines
Deal found 10/6C$ 504
Wed 1/75:20 p.m.
YYZ
-
DEN
2 stops20h 00m
WestJet
Mon 6/712:15 p.m.
DEN
-
YYZ
1 stop8h 30m
WestJet
Deal found 10/6C$ 510
Fri 17/72:25 p.m.
YYZ
-
DEN
2 stops22h 55m
WestJet
Tue 21/712:15 p.m.
DEN
-
YYZ
1 stop8h 30m
WestJet
Deal found 11/6C$ 515
Tue 21/72:25 p.m.
YYZ
-
DEN
2 stops22h 55m
WestJet
Sun 2/812:15 p.m.
DEN
-
YYZ
2 stops25h 05m
WestJet
Deal found 10/6C$ 517
Tue 14/75:20 p.m.
YYZ
-
DEN
2 stops20h 00m
WestJet
Tue 21/712:15 p.m.
DEN
-
YYZ
1 stop8h 30m
WestJet
Deal found 11/6C$ 518
Thu 16/72:50 p.m.
YYZ
-
DEN
1 stop22h 30m
WestJet
Mon 20/712:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Deal found 8/6C$ 520

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 12 June 2026.

Round-trip from

C$ 468

One-way from

C$ 216

Popular in

February

Cheapest in

November

Average price

C$ 697

Good round-trip deal

C$ 657 or less

Good one-way deal

C$ 391 or less
United Airlines
  • United Airlines
  • 21/8-23/8
  • 1 total stop
  • 33h 02m total
  • Ontario to Colorado
Search Deals
21/9
  • 21/9
  • 1 total stop
  • 29h 49m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 35 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).
Search Deals
Average for round-trip flights in June 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 12 June 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

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Wed 15/7

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

1 stop16h 40m

Denver Intl

Sat 18/7

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

1 stop29h 35m

C$ 525

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Mon 24/8

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

1 stop16h 40m

Denver Intl

Thu 27/8

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

1 stop29h 35m

C$ 531

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Fri 31/7

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

1 stop16h 40m

Denver Intl

Sun 2/8

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

1 stop29h 35m

C$ 531

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Tue 14/7

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

1 stop16h 40m

Denver Intl

Sat 18/7

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

1 stop29h 35m

C$ 532

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Mon 24/8

6:10 p.m.-11:20 a.m.

1 stop19h 10m

Denver Intl

Mon 31/8

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

1 stop27h 00m

C$ 549

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Tue 18/8

6:10 p.m.-11:20 a.m.

1 stop19h 10m

Denver Intl

Sun 23/8

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

1 stop27h 00m

C$ 550

WindsorDenver

YQG - DEN

YQGDEN

Windsor

Sat 18/7

4:00 p.m.-11:20 a.m.

1 stop21h 20m

Denver Intl

Fri 24/7

12:15 p.m.-3:10 p.m.

1 stop24h 55m

C$ 553

HamiltonDenver

YHM - DEN

YHMDEN

Hamilton

Mon 24/8

6:10 p.m.-11:20 a.m.

1 stop19h 10m

Denver Intl

Thu 27/8

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

1 stop27h 00m

C$ 557

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Thu 29/10

5:50 p.m.-10:30 p.m.

1 stop6h 40m

Colorado Springs

Mon 2/11

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

2 stops15h 00m

C$ 585

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Thu 6/8

10:00 a.m.-9:38 p.m.

2 stops13h 38m

Colorado Springs

Wed 12/8

6:00 a.m.-5:19 p.m.

1 stop9h 19m

C$ 592

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/6

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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, July is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 180). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 412). 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 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 12 June 2026.

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).

How much does it cost to fly round-trip from Region of 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 54 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 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
9,810 reviews
Check prices

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

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
9,810 reviews
United Airlines
7.4
Good
9,810 reviews
Check prices

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

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
3,357 reviews
United Airlines
7.4
Good
9,810 reviews
Check prices

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

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
11,644 reviews
United Airlines
7.4
Good
9,810 reviews
Check prices

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

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
11,168 reviews
United Airlines
7.4
Good
9,810 reviews
Check prices

Entertainment

7.1

Food

6.6

Boarding

7.7

Crew

8.1

Comfort

7.3

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 6h 29m. WestJet provides one of the quickest options available for as low as C$ 648. 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.

  • 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, July is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 180). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 412). 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 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 308AverageC$ 736FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 370AverageC$ 465FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 400AverageC$ 690FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 777AverageC$ 812FlexibilityNo 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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