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Cheap flights from Ontario to Colorado from C$ 190

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
15 Oct — 22 Oct1
1 adult
1 adult, Economy

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 15 September 2025.

Round-trip from

C$ 364

One-way from

C$ 190

Popular in

September

Cheapest in

November

Average price

C$ 750

Good round-trip deal

C$ 577 or less

Good one-way deal

C$ 406 or less
United Airlines
  • United Airlines
  • 19/2-24/2
  • 2 total stops
  • 15h 38m total
  • Ontario to Colorado
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6/10
  • 6/10
  • 1 total stop
  • 9h 38m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 8 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to Colorado.
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Price to beat on a one-way flight from Ontario to Colorado.
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Find flight deals from Ontario to Colorado

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 15 September 2025.

Thu 20/1111:10 a.m.YOW - DEN
1 stop14h 05mUnited Airlines
Mon 24/1111:59 p.m.DEN - YOW
1 stop12h 28mUnited Airlines
Deal found 14/9C$ 376
Tue 2/125:15 a.m.YOW - DEN
1 stop7h 08mUnited Airlines
Mon 8/124:10 p.m.DEN - YOW
1 stop16h 16mUnited Airlines
Deal found 14/9C$ 378
Sat 27/95:30 p.m.YUL - DEN
1 stop19h 54mMultiple Airlines
Sat 11/108:00 a.m.DEN - YUL
2 stops14h 41mMultiple Airlines
Deal found 13/9C$ 392
Sat 27/97:00 a.m.YUL - DEN
1 stop30h 24mWestJet
Mon 29/912:15 p.m.DEN - YUL
2 stops34h 12mWestJet
Deal found 13/9C$ 403
Sat 27/95:30 p.m.YUL - DEN
1 stop19h 54mMultiple Airlines
Wed 8/108:00 a.m.DEN - YUL
2 stops14h 27mMultiple Airlines
Deal found 13/9C$ 406
Sat 4/106:45 a.m.YUL - DEN
1 stop18h 28mMultiple Airlines
Wed 22/1010:29 p.m.DEN - YUL
2 stops24h 12mMultiple Airlines
Deal found 13/9C$ 426
Sat 4/106:45 a.m.YUL - DEN
1 stop18h 28mMultiple Airlines
Wed 15/108:21 p.m.DEN - YUL
2 stops26h 06mMultiple Airlines
Deal found 13/9C$ 428
Tue 14/107:15 a.m.YYZ - DEN
1 stop18h 01mMultiple Airlines
Sat 18/1012:00 p.m.DEN - YYZ
1 stop7h 07mMultiple Airlines
Deal found 14/9C$ 428
Sat 18/101:35 p.m.YYZ - DEN
2 stops19h 46mMultiple Airlines
Sat 25/1012:00 p.m.DEN - YYZ
1 stop7h 07mMultiple Airlines
Deal found 15/9C$ 429
Sat 4/106:45 a.m.YUL - DEN
1 stop18h 28mMultiple Airlines
Sat 25/108:00 a.m.DEN - YUL
2 stops14h 41mMultiple Airlines
Deal found 13/9C$ 430
Thu 30/107:30 a.m.YUL - DEN
1 stop12h 14mAir Canada
Thu 6/118:45 a.m.DEN - YUL
1 stop10h 15mAir Canada
Deal found 14/9C$ 432
Thu 16/109:00 a.m.YYZ - DEN
1 stop10h 18mAir Canada
Fri 17/108:40 a.m.DEN - YYZ
1 stop9h 50mAir Canada
Deal found 13/9C$ 432

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 15 September 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

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 19/2

12:05 p.m.-5:46 p.m.

1 stop7h 41m

Denver Intl

Tue 24/2

6:00 a.m.-4:30 p.m.

1 stop8h 30m

C$ 364

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 13/3

10:35 a.m.-5:35 p.m.

1 stop9h 00m

Denver Intl

Tue 17/3

6:15 a.m.-4:50 p.m.

1 stop8h 35m

C$ 376

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 3/3

11:10 a.m.-3:57 p.m.

1 stop6h 47m

Denver Intl

Wed 4/3

7:50 a.m.-4:30 p.m.

1 stop6h 40m

C$ 376

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Thu 20/11

9:45 a.m.-4:31 p.m.

1 stop8h 46m

Denver Intl

Mon 24/11

8:30 p.m.-10:26 a.m.

1 stop11h 56m

C$ 376

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 29/10

11:10 a.m.-4:30 p.m.

1 stop7h 20m

Denver Intl

Wed 5/11

12:45 p.m.-9:56 p.m.

1 stop7h 11m

C$ 376

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 2/12

5:15 a.m.-10:23 a.m.

1 stop7h 08m

Denver Intl

Mon 8/12

4:10 p.m.-10:26 a.m.

1 stop16h 16m

C$ 378

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Thu 30/10

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

Nonstop4h 30m

Denver Intl

Thu 6/11

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

Nonstop3h 43m

C$ 426

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Tue 14/10

12:00 p.m.-12:44 p.m.

2 stops26h 44m

Denver Intl

Mon 20/10

8:58 p.m.-12:17 p.m.

1 stop13h 19m

C$ 433

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Sat 11/10

9:10 a.m.-1:08 a.m.

2 stops17h 58m

Denver Intl

Fri 17/10

9:19 p.m.-12:17 p.m.

1 stop12h 58m

C$ 435

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Sat 11/10

3:00 p.m.-1:08 a.m.

1 stop12h 08m

Denver Intl

Sat 18/10

8:22 p.m.-12:17 p.m.

1 stop13h 55m

C$ 440

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/9

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, August is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 320). Flying from Region of Ontario to Colorado in December is currently the most expensive (average of C$ 484). 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 15 September 2025.

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 15 September 2025.

The most flights from CAON to USCO are scheduled on a Monday (11 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (10 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 15 September 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
8,929 reviews
Check prices

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.
United Airlines
7.4
Good
8,929 reviews
United Airlines
7.4
Good
8,929 reviews
Check prices

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.
WestJet
7.2
Good
3,091 reviews
United Airlines
7.4
Good
8,929 reviews
Check prices

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.
Air Canada
7.1
Good
10,000 reviews
United Airlines
7.4
Good
8,929 reviews
Check prices

Entertainment

7.1

Crew

8.1

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.

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 4h 30m. United Airlines provides one of the quickest options available for as low as C$ 426. 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$ 224), Air Canada (C$ 228), and American Airlines (C$ 266).

  • 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, August is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 320). Flying from Region of Ontario to Colorado in December is currently the most expensive (average of C$ 484). 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 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 260AverageC$ 457FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 305AverageC$ 754FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 336AverageC$ 659FlexibilityNo 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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