Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Ontario to Colorado from C$ 204

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 26/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

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 30 October 2025.

Round-trip from

C$ 458

One-way from

C$ 204

Popular in

December

Cheapest in

November

Average price

C$ 663

Good round-trip deal

C$ 627 or less

Good one-way deal

C$ 384 or less
American Airlines
  • American Airlines
  • 20/1-26/1
  • 2 total stops
  • 41h 35m total
  • Ontario to Colorado
Search Deals
26/1
  • 26/1
  • 1 total stop
  • 17h 54m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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

Find 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 30 October 2025.

Mon 15/123:55 p.m.YOW - DEN
1 stop11h 28mMultiple Airlines
Wed 24/1210:37 p.m.DEN - YOW
2 stops47h 21mMultiple Airlines
Deal found 28/10C$ 471
Tue 9/125:10 p.m.YUL - DEN
1 stop27h 59mMultiple Airlines
Mon 15/1211:59 p.m.DEN - YUL
2 stops17h 45mMultiple Airlines
Deal found 28/10C$ 480
Fri 12/127:55 p.m.YYZ - DEN
1 stop10h 03mMultiple Airlines
Wed 7/14:25 p.m.DEN - YYZ
1 stop13h 30mMultiple Airlines
Deal found 28/10C$ 483
Tue 2/127:45 p.m.YYZ - DEN
1 stop25h 24mMultiple Airlines
Thu 4/1211:59 p.m.DEN - YYZ
1 stop18h 01mMultiple Airlines
Deal found 30/10C$ 486
Tue 9/124:45 p.m.YYZ - DEN
1 stop27h 18mAlaska Airlines
Tue 6/18:22 p.m.DEN - YYZ
1 stop17h 13mAlaska Airlines
Deal found 28/10C$ 489
Sun 14/128:00 p.m.YYZ - DEN
1 stop9h 58mMultiple Airlines
Tue 6/111:59 p.m.DEN - YYZ
1 stop9h 47mMultiple Airlines
Deal found 28/10C$ 490
Thu 20/1112:30 p.m.YTZ - DEN
1 stop9h 25mAir Canada
Wed 26/1111:15 a.m.DEN - YTZ
1 stop8h 20mAir Canada
Deal found 28/10C$ 492
Mon 17/117:55 p.m.YYZ - DEN
1 stop10h 04mMultiple Airlines
Mon 24/119:44 a.m.DEN - YYZ
2 stops19h 14mMultiple Airlines
Deal found 28/10C$ 492
Thu 20/115:25 p.m.YUL - DEN
Nonstop4h 30mAir Canada
Wed 26/1111:15 a.m.DEN - YUL
Nonstop3h 43mAir Canada
Deal found 29/10C$ 493
Thu 11/127:55 p.m.YYZ - DEN
1 stop10h 03mMultiple Airlines
Tue 6/111:59 p.m.DEN - YYZ
1 stop9h 47mMultiple Airlines
Deal found 28/10C$ 493
Tue 25/1112:40 p.m.YYZ - DEN
1 stop17h 18mMultiple Airlines
Tue 2/1210:50 a.m.DEN - YYZ
2 stops35h 21mMultiple Airlines
Deal found 27/10C$ 494
Mon 8/124:45 p.m.YYZ - DEN
1 stop9h 14mAlaska Airlines
Tue 6/16:02 a.m.DEN - YYZ
1 stop31h 33mAlaska Airlines
Deal found 28/10C$ 500

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 30 October 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

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 20/11

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

1 stop9h 25m

Denver Intl

Wed 26/11

11:15 a.m.-9:35 p.m.

1 stop8h 20m

C$ 492

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 30/1

9:15 a.m.-9:50 p.m.

1 stop14h 35m

Denver Intl

Wed 4/2

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

2 stops13h 10m

C$ 497

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Wed 12/11

9:15 a.m.-7:59 p.m.

1 stop12h 44m

Denver Intl

Thu 13/11

12:59 a.m.-6:55 p.m.

2 stops15h 56m

C$ 501

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 14/11

9:15 a.m.-2:16 p.m.

1 stop7h 01m

Denver Intl

Mon 17/11

8:05 a.m.-6:57 p.m.

1 stop8h 52m

C$ 501

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Mon 15/12

9:25 a.m.-1:23 a.m.

1 stop17h 58m

Denver Intl

Wed 24/12

4:25 p.m.-5:25 p.m.

1 stop23h 00m

C$ 553

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Wed 4/2

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

1 stop9h 25m

Denver Intl

Wed 11/2

11:15 a.m.-9:35 p.m.

1 stop8h 20m

C$ 556

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Thu 20/11

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

1 stop9h 25m

Denver Intl

Thu 27/11

11:15 a.m.-9:35 p.m.

1 stop8h 20m

C$ 556

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Tue 18/11

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

1 stop9h 25m

Denver Intl

Tue 25/11

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

1 stop6h 40m

C$ 556

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Tue 21/4

2:50 p.m.-9:58 p.m.

2 stops9h 08m

Colorado Springs

Thu 23/4

7:00 a.m.-10:16 p.m.

2 stops13h 16m

C$ 557

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 1/2

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

2 stops20h 53m

Denver Intl

Sun 8/2

7:00 a.m.-3:35 p.m.

1 stop30h 35m

C$ 560

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/10

Showing 1-10 of 60 results
1
2
3
...
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, November is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 279). Flying from Region of Ontario to Colorado in May 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 30 October 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 24% on flights from Region of Ontario to Colorado by exploring options for tickets in the evening.

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 30 October 2025.
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
8,998 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
8,998 reviews
United Airlines
7.4
Good
8,998 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
WestJet
7.2
Good
3,152 reviews
United Airlines
7.4
Good
8,998 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Air Canada
7.1
Good
10,381 reviews
United Airlines
7.4
Good
8,998 reviews
Check prices

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

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 7h 21m. Air Canada provides one of the quickest options available for as low as C$ 575. 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.

  • 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 United Airlines (C$ 257), American Airlines (C$ 321), and Delta (C$ 323).

  • 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, November is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 279). Flying from Region of Ontario to Colorado in May 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to John F Kennedy Intl flights
Pearson Intl to Newark flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Toronto Island to Newark flights
Pearson Intl to Fort Lauderdale flights
Pearson Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Pearson Intl to Miami flights
Pearson Intl to Los Angeles flights
Pierre Elliott Trudeau Intl to Miami flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pearson Intl to Dallas/Fort Worth flights
Pearson Intl to Orlando flights
Vancouver Intl to Los Angeles flights
Pearson Intl to Las Vegas flights
Vancouver Intl to Newark flights
Pierre Elliott Trudeau Intl to Newark flights
Pearson Intl to San Francisco flights
Pearson Intl to Hobby flights
Toronto Island to Fort Lauderdale flights
Vancouver Intl to John F Kennedy Intl flights
Pearson Intl to Tampa flights
Toronto Island to Orlando flights
Vancouver Intl to Honolulu flights
Pearson Intl to George Bush Intcntl flights
Pearson Intl to O'Hare Intl flights
Vancouver Intl to Las Vegas flights
Pearson Intl to Reagan-National flights
Pierre Elliott Trudeau Intl to Orlando flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Pearson Intl to Sky Harbor Intl flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Toronto Island to Miami flights
Vancouver Intl to San Francisco flights
Vancouver Intl to Miami flights
Calgary to Las Vegas flights
Pearson Intl to Fort Myers flights
Vancouver Intl to LaGuardia flights
Pearson Intl to Seattle flights
Pearson Intl to Boston flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Pearson Intl to Atlanta flights
Pearson Intl to Dulles Intl flights
Vancouver Intl to Fort Lauderdale flights
Vancouver Intl to Palm Springs flights
Pearson Intl to Nashville flights
Vancouver Intl to San Diego flights
Vancouver Intl to Sky Harbor Intl flights
Hamilton to Fort Lauderdale flights
Calgary to Newark flights

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 30 October 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 262AverageC$ 459FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 308AverageC$ 694FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 398AverageC$ 680FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.