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Cheap flights from Ontario to Colorado from C$ 307

YYZ — DEN
26 Nov — 3 Dec1
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

Mon 16/111:00 p.m. -
2 stops21h 22m
Wed 18/114:09 p.m. -
3 stops21h 11m
Deal found 23/10C$ 550
Sat 14/119:50 a.m. -
2 stops16h 03m
Mon 23/117:50 p.m. -
1 stop9h 01m
Deal found 23/10C$ 551
Fri 13/114:15 p.m. -
3 stops22h 15m
Sat 14/118:55 p.m. -
1 stop16h 05m
Deal found 25/10C$ 553
Mon 7/128:30 p.m. -
2 stops14h 20m
Fri 11/127:10 a.m. -
2 stops14h 37m
Deal found 23/10C$ 553
Mon 16/114:35 p.m. -
1 stop17h 51m
Tue 24/1111:59 p.m. -
2 stops16h 16m
Deal found 26/10C$ 554
Thu 19/114:35 p.m. -
1 stop18h 01m
Wed 25/119:26 p.m. -
1 stop15h 34m
Deal found 27/10C$ 556
Tue 17/119:50 a.m. -
2 stops16h 03m
Fri 20/119:04 a.m. -
1 stop7h 06m
Deal found 23/10C$ 556
Sat 14/113:15 p.m. -
1 stop11h 11m
Mon 23/1112:21 p.m. -
1 stop9h 38m
Deal found 23/10C$ 557
Mon 7/124:15 p.m. -
2 stops16h 14m
Mon 14/126:59 p.m. -
2 stops18h 01m
Deal found 23/10C$ 558
Mon 16/111:17 p.m. -
1 stop11h 37m
Wed 18/116:50 a.m. -
1 stop8h 51m
Deal found 22/10C$ 558
Mon 16/111:00 p.m. -
2 stops21h 22m
Thu 19/117:30 a.m. -
3 stops20h 15m
Deal found 23/10C$ 560
Tue 8/129:10 a.m. -
3 stops32h 33m
Tue 15/128:16 p.m. -
3 stops23h 43m
Deal found 24/10C$ 561

Find flight deals from Ontario to Colorado

Round-trip from

C$ 550

One-way from

C$ 307

Popular in

October

Cheapest in

April

Average price

C$ 781

Good round-trip deal

C$ 716 or less

Good one-way deal

C$ 428 or less
16/11-18/11
  • 16/11-18/11
  • 5 total stops
  • 42h 33m total
  • Ontario to Colorado
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6/12-31/12
  • 6/12-31/12
  • 2 total stops
  • 17h 07m total
  • Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 33 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
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Average for round-trip flights in October 2026
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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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Cheapflights Fare Finder

 
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

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Sun 6/12

8:40 a.m.-11:47 p.m.

2 stops17h 07m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 307

TorontoDenver

YTZ Toronto Island - DEN Denver Intl

YTZDEN

Toronto Island

Tue 10/11

4:35 p.m.-8:26 a.m.

1 stop17h 51m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 311

TorontoDenver

YTZ Toronto Island - DEN Denver Intl

YTZDEN

Toronto Island

Tue 8/12

12:15 p.m.-6:29 a.m.

3 stops20h 14m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 334

TorontoDenver

YYZ Toronto Pearson Intl - DEN Denver Intl

YYZDEN

Toronto Pearson Intl

Thu 10/12

5:25 p.m.-9:04 a.m.

2 stops17h 39m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 337

TorontoDenver

YYZ Toronto Pearson Intl - DEN Denver Intl

YYZDEN

Toronto Pearson Intl

Fri 11/12

6:15 a.m.-7:55 p.m.

2 stops15h 40m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 337

TorontoDenver

YTZ Toronto Island - DEN Denver Intl

YTZDEN

Toronto Island

Fri 11/12

4:15 p.m.-8:50 a.m.

2 stops18h 35m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 340

TorontoDenver

YYZ Toronto Pearson Intl - DEN Denver Intl

YYZDEN

Toronto Pearson Intl

Mon 9/11

6:00 a.m.-7:53 p.m.

2 stops15h 53m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 345

TorontoDenver

YTZ Toronto Island - DEN Denver Intl

YTZDEN

Toronto Island

Sun 22/11

9:10 a.m.-6:36 a.m.

2 stops23h 26m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 348

TorontoDenver

YYZ Toronto Pearson Intl - DEN Denver Intl

YYZDEN

Toronto Pearson Intl

Thu 19/11

9:35 a.m.-11:44 p.m.

3 stops16h 09m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 358

TorontoDenver

YTZ Toronto Island - DEN Denver Intl

YTZDEN

Toronto Island

Mon 9/11

4:15 p.m.-8:00 p.m.

2 stops29h 45m

Denver Intl

Wed 31/12

12:00 a.m.-2:00 a.m.

Nonstop0h 00m

C$ 363

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/10

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

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$ 665). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 936). 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?

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.

How much does it cost to fly round-trip from Region of Ontario to Colorado?

Airfare is below average for this route at the moment.
Region of Ontario to Colorado flights typically cost between C$ 636 and C$ 832 in November.
The cheapest round-trip price found within the last 5 days was C$ 550 on Multiple Airlines (16 Nov-18 Nov).

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 68 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 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
7.3
Good
10,443 reviews
Check prices

Boarding

7.7

Overall

7.3

Comfort

7.3

Entertainment

7.1

Crew

8.1

Food

6.7

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
United Airlines
7.3
Good
10,443 reviews
United Airlines
7.3
Good
10,443 reviews
Check prices

Boarding

7.7

Overall

7.3

Comfort

7.3

Entertainment

7.1

Crew

8.1

Food

6.7

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
WestJet
7.2
Good
3,444 reviews
United Airlines
7.3
Good
10,443 reviews
Check prices

Boarding

7.7

Overall

7.3

Comfort

7.3

Entertainment

7.1

Crew

8.1

Food

6.7

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
Air Canada
7.1
Good
11,819 reviews
United Airlines
7.3
Good
10,443 reviews
Check prices

Boarding

7.7

Overall

7.3

Comfort

7.3

Entertainment

7.1

Crew

8.1

Food

6.7

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
American Airlines
7.0
Good
12,191 reviews
United Airlines
7.3
Good
10,443 reviews
Check prices

Boarding

7.7

Overall

7.3

Comfort

7.3

Entertainment

7.1

Crew

8.1

Food

6.7

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible

Related info for your journey

  • How long is the flight from Region of Ontario to Colorado?

    A quick flight from Region of Ontario to Colorado can take about 7h 31m. United Airlines provides one of the quickest options available for as low as C$ 659. 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.

  • 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$ 665). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 936). 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

Alternative routes for Ontario to Colorado

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Top 4 airlines flying from Ontario to Colorado

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 403AverageC$ 824FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 410AverageC$ 455FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 517AverageC$ 789FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 781AverageC$ 816FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

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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