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Cheap flights from Ontario to Colorado from C$ 234

YYZ — DEN
12 Oct — 19 Oct1
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

Sat 17/104:15 p.m. -
1 stop21h 05m
Thu 22/1010:44 p.m. -
2 stops28h 51m
Deal found 9/9C$ 471
Wed 7/108:00 p.m. -
1 stop17h 20m
Sun 11/1012:15 p.m. -
1 stop9h 30m
Deal found 7/9C$ 472
Wed 7/108:15 p.m. -
1 stop17h 05m
Wed 14/1010:44 p.m. -
2 stops28h 51m
Deal found 9/9C$ 475
Sat 17/104:15 p.m. -
1 stop21h 05m
Sat 24/101:07 p.m. -
2 stops14h 28m
Deal found 9/9C$ 489
Sat 17/104:15 p.m. -
1 stop21h 05m
Mon 26/1010:44 p.m. -
2 stops24h 16m
Deal found 9/9C$ 496
Fri 2/101:20 p.m. -
2 stops30h 55m
Mon 5/1012:15 p.m. -
1 stop15h 20m
Deal found 8/9C$ 515
Sat 17/108:00 p.m. -
1 stop17h 20m
Tue 20/101:07 p.m. -
2 stops15h 58m
Deal found 10/9C$ 520
Sat 17/108:00 p.m. -
1 stop17h 20m
Thu 22/101:07 p.m. -
2 stops15h 58m
Deal found 10/9C$ 522
Fri 2/101:20 p.m. -
2 stops22h 12m
Sun 4/1012:15 p.m. -
1 stop15h 20m
Deal found 8/9C$ 524
Sat 10/108:00 p.m. -
1 stop17h 20m
Sat 17/1010:44 p.m. -
2 stops19h 46m
Deal found 9/9C$ 525
Wed 7/108:00 p.m. -
1 stop17h 20m
Wed 14/101:07 p.m. -
2 stops15h 58m
Deal found 9/9C$ 526
Sat 17/104:15 p.m. -
1 stop21h 05m
Fri 23/101:07 p.m. -
2 stops14h 28m
Deal found 9/9C$ 529

Find flight deals from Ontario to Colorado

Round-trip from

C$ 471

One-way from

C$ 234

Popular in

October

Cheapest in

November

Average price

C$ 672

Good round-trip deal

C$ 642 or less

Good one-way deal

C$ 342 or less
17/10-22/10
  • 17/10-22/10
  • 3 total stops
  • 49h 56m total
  • Ontario to Colorado
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28/9-31/12
  • 28/9-31/12
  • 1 total stop
  • 26h 31m total
  • Ontario to Colorado
Search Deals
High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 0% potential price decrease (C$ 10 potential savings vs. average RT price).
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Average for round-trip flights in September 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

Thu 22/10

1:20 p.m.-8:17 p.m.

2 stops32h 57m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 269

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 22/9

6:55 a.m.-5:21 p.m.

2 stops12h 26m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 321

MontrealDenver

YUL Montreal Pierre Elliott Trudeau Intl - DEN Denver Intl

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sat 17/10

6:45 a.m.-11:20 a.m.

2 stops30h 35m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 328

TorontoDenver

YTZ Toronto Island - DEN Denver Intl

YTZDEN

Toronto Island

Mon 30/11

10:35 a.m.-8:59 p.m.

2 stops36h 24m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 331

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Fri 25/9

6:55 a.m.-7:05 p.m.

2 stops14h 10m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 331

MontrealDenver

YUL Montreal Pierre Elliott Trudeau Intl - DEN Denver Intl

YULDEN

Montreal Pierre Elliott Trudeau Intl

Fri 9/10

7:20 p.m.-11:20 a.m.

2 stops42h 00m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 335

TorontoColorado Springs

YYZ Toronto Pearson Intl - COS Colorado Springs

YYZCOS

Toronto Pearson Intl

Wed 23/9

6:00 a.m.-7:56 p.m.

2 stops15h 56m

Colorado Springs

Wed 31/12

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

Nonstop0h 00m

C$ 342

MontrealDenver

YUL Montreal Pierre Elliott Trudeau Intl - DEN Denver Intl

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sun 4/10

8:00 p.m.-9:43 a.m.

2 stops39h 43m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 346

OttawaDenver

YOW Ottawa - DEN Denver Intl

YOWDEN

Ottawa

Tue 22/9

6:25 p.m.-11:20 a.m.

2 stops42h 55m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 346

MontrealDenver

YUL Montreal Pierre Elliott Trudeau Intl - DEN Denver Intl

YULDEN

Montreal Pierre Elliott Trudeau Intl

Sun 18/10

7:20 p.m.-11:43 p.m.

3 stops30h 23m

Denver Intl

Wed 31/12

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

Nonstop0h 00m

C$ 346

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

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, October is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 654). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 924). 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.

Weekly flight availability from Region of Ontario to Colorado

The most flights from CAON to USCO are scheduled on a Wednesday (9 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (7 on average).

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$ 604 and C$ 801 in September.
The cheapest round-trip price found within the last 5 days was C$ 565 on Multiple Airlines (29 Sep-2 Oct).

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, 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
10,207 reviews
Check prices

Overall

7.4

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Food

6.7

Crew

8.1

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
7.4
Good
10,207 reviews
United Airlines
7.4
Good
10,207 reviews
Check prices

Overall

7.4

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Food

6.7

Crew

8.1

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
3,445 reviews
United Airlines
7.4
Good
10,207 reviews
Check prices

Overall

7.4

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Food

6.7

Crew

8.1

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
7.1
Good
12,051 reviews
United Airlines
7.4
Good
10,207 reviews
Check prices

Overall

7.4

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Food

6.7

Crew

8.1

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
11,619 reviews
United Airlines
7.4
Good
10,207 reviews
Check prices

Overall

7.4

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Food

6.7

Crew

8.1

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 6h 58m. Delta provides one of the quickest options available for as low as C$ 604. 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, October is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of C$ 654). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of C$ 924). 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

Toronto Island to Newark flights
Pearson Intl to Newark flights
Pearson Intl to John F Kennedy Intl flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Vancouver Intl to Los Angeles flights
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Pearson Intl to Seattle flights
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Calgary to Las Vegas flights
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Vancouver Intl to Honolulu flights
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Top 4 airlines flying from Ontario to Colorado

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 376AverageC$ 788FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 405AverageC$ 450FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 439AverageC$ 746FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 771AverageC$ 806FlexibilityNo 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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