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Cheap flights from Ontario to Colorado from C$ 193

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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
11 Jan — 18 Jan1
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 December 2025.

Wed 24/122:50 p.m.YYZ - DEN
Nonstop3h 50mAir Canada
Sun 25/11:25 p.m.DEN - YYZ
Nonstop3h 10mAir Canada
Deal found 10/12C$ 627
Wed 31/125:25 p.m.YUL - DEN
Nonstop4h 30mAir Canada
Tue 6/18:05 a.m.DEN - YUL
1 stop10h 50mAir Canada
Deal found 11/12C$ 699
Wed 31/126:45 a.m.YUL - DEN
2 stops28h 11mMultiple Airlines
Tue 6/111:59 p.m.DEN - YUL
1 stop22h 31mMultiple Airlines
Deal found 11/12C$ 705
Wed 31/125:25 p.m.YUL - DEN
Nonstop4h 30mAir Canada
Wed 7/11:25 p.m.DEN - YUL
1 stop7h 57mAir Canada
Deal found 11/12C$ 709
Wed 31/128:50 a.m.YUL - DEN
2 stops9h 50mAir Canada
Thu 1/18:05 a.m.DEN - YUL
1 stop9h 20mAir Canada
Deal found 11/12C$ 723
Wed 24/1210:00 a.m.YYZ - DEN
2 stops15h 33mMultiple Airlines
Sun 25/17:10 a.m.DEN - YYZ
1 stop21h 37mMultiple Airlines
Deal found 10/12C$ 741
Thu 25/128:30 a.m.YYZ - DEN
Nonstop3h 53mAir Canada
Sat 27/128:45 a.m.DEN - YYZ
1 stop10h 14mAir Canada
Deal found 11/12C$ 756
Wed 24/126:10 a.m.YYZ - DEN
1 stop17h 55mUnited Airlines
Fri 2/17:45 a.m.DEN - YYZ
1 stop14h 14mUnited Airlines
Deal found 9/12C$ 763
Wed 31/127:08 a.m.YUL - DEN
1 stop17h 23mAmerican Airlines
Thu 1/16:21 a.m.DEN - YUL
1 stop6h 53mAmerican Airlines
Deal found 10/12C$ 775
Wed 31/125:25 p.m.YUL - DEN
Nonstop4h 30mAir Canada
Fri 2/16:00 a.m.DEN - YUL
1 stop7h 57mAir Canada
Deal found 11/12C$ 785
Thu 11/124:15 p.m.YOW - DEN
2 stops42h 05mMultiple Airlines
Wed 7/14:25 p.m.DEN - YOW
1 stop23h 00mMultiple Airlines
Deal found 11/12C$ 797
Sun 14/128:20 p.m.YYZ - DEN
2 stops19h 26mMultiple Airlines
Mon 15/125:35 p.m.DEN - YYZ
1 stop10h 45mMultiple Airlines
Deal found 9/12C$ 804

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 December 2025.

Round-trip from

C$ 418

One-way from

C$ 193

Popular in

December

Cheapest in

November

Average price

C$ 707

Good round-trip deal

C$ 638 or less

Good one-way deal

C$ 339 or less
United Airlines
  • United Airlines
  • 14/4-21/4
  • 4 total stops
  • 21h 54m total
  • Ontario to Colorado
Search Deals
9/2
  • 9/2
  • 1 total stop
  • 10h 01m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 3 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 December 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

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 December 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

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Tue 14/4

6:52 a.m.-2:20 p.m.

2 stops9h 28m

Colorado Springs

Tue 21/4

7:30 a.m.-9:56 p.m.

2 stops12h 26m

C$ 418

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Tue 7/4

10:35 a.m.-8:46 p.m.

2 stops12h 11m

Colorado Springs

Tue 14/4

10:30 a.m.-9:56 p.m.

2 stops9h 26m

C$ 418

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Wed 15/4

10:35 a.m.-8:46 p.m.

2 stops12h 11m

Colorado Springs

Mon 20/4

1:32 p.m.-9:11 a.m.

2 stops17h 39m

C$ 419

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 7/1

9:15 a.m.-1:23 a.m.

2 stops18h 08m

Denver Intl

Wed 14/1

4:27 p.m.-5:25 p.m.

1 stop22h 58m

C$ 422

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Wed 8/4

10:35 a.m.-8:46 p.m.

2 stops12h 11m

Colorado Springs

Sat 11/4

7:00 a.m.-7:34 p.m.

2 stops10h 34m

C$ 501

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Wed 1/4

5:00 a.m.-2:20 p.m.

2 stops11h 20m

Colorado Springs

Tue 7/4

10:30 a.m.-9:56 p.m.

2 stops9h 26m

C$ 501

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Wed 15/4

6:00 a.m.-2:20 p.m.

2 stops10h 20m

Colorado Springs

Tue 21/4

1:32 p.m.-11:54 p.m.

2 stops8h 22m

C$ 502

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Thu 8/1

5:25 p.m.-7:55 p.m.

Nonstop4h 30m

Denver Intl

Wed 14/1

8:05 a.m.-7:25 p.m.

1 stop9h 20m

C$ 512

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Fri 9/1

5:25 p.m.-7:55 p.m.

Nonstop4h 30m

Denver Intl

Mon 12/1

11:15 a.m.-4:58 p.m.

Nonstop3h 43m

C$ 514

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sun 11/1

5:25 p.m.-7:55 p.m.

Nonstop4h 30m

Denver Intl

Sun 18/1

8:05 a.m.-8:55 p.m.

1 stop10h 50m

C$ 521

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

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, December is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 298). Flying from Region of Ontario to Colorado in May is currently the most expensive (average of C$ 407). 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 December 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 26% on flights from Region of Ontario to Colorado by exploring options for tickets in the evening.

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 December 2025.

The most flights from CAON to USCO are scheduled on a Monday (7 on average). You will have fewer flight options on Sunday, 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 12 December 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
9,095 reviews
Check prices

Boarding

7.7

Food

6.6

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

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
9,095 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Boarding

7.7

Food

6.6

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

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
3,195 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Boarding

7.7

Food

6.6

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

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
10,516 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Boarding

7.7

Food

6.6

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

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 9h 28m. United Airlines provides one of the quickest options available for as low as C$ 418. There are 2486 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$ 171), Air Canada (C$ 244), and United Airlines (C$ 303).

  • 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, December is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 298). Flying from Region of Ontario to Colorado in May is currently the most expensive (average of C$ 407). 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 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 259AverageC$ 448FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 304AverageC$ 684FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 369AverageC$ 638FlexibilityNo 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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