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$137+ Cheap flights from Ontario to Colorado

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 2/27. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
feb. 28 — mar. 71
sáb. 2/28
sáb. 3/7
1 adult, Economy
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Cheap 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 enero 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/268:00 am
YUL
-
DEN
2 stops25h 00m
Multiple Airlines
mié. 5/612:15 pm
DEN
-
YUL
1 stop23h 57m
Multiple Airlines
Deal found 1/27$363
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/1512:30 pm
YUL
-
DEN
1 stop13h 29m
American Airlines
vie. 4/175:44 pm
DEN
-
YUL
1 stop16h 00m
American Airlines
Deal found 1/28$365
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/286:45 am
YUL
-
DEN
2 stops15h 16m
Multiple Airlines
mié. 5/612:15 pm
DEN
-
YUL
1 stop23h 57m
Multiple Airlines
Deal found 1/27$368
This FlightHub deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/288:00 pm
YUL
-
DEN
1 stop17h 20m
WestJet
mié. 5/612:15 pm
DEN
-
YUL
1 stop9h 30m
WestJet
Deal found 1/27$369
This Air Canada deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/98:30 am
YYZ
-
DEN
Nonstop3h 53m
Air Canada
mié. 3/118:05 am
DEN
-
YYZ
1 stop11h 32m
Air Canada
Deal found 1/28$378
This Alaska Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 2/284:45 pm
YYZ
-
DEN
1 stop9h 14m
Alaska Airlines
lun. 3/27:52 pm
DEN
-
YYZ
1 stop17h 43m
Alaska Airlines
Deal found 1/28$380
This Air Canada deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/121:00 pm
YYZ
-
DEN
1 stop8h 55m
Air Canada
jue. 3/195:30 pm
DEN
-
YYZ
Nonstop3h 11m
Air Canada
Deal found 1/27$381
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 2/97:10 am
YYZ
-
DEN
1 stop27h 10m
Multiple Airlines
mié. 2/1110:29 pm
DEN
-
YYZ
1 stop30h 14m
Multiple Airlines
Deal found 1/28$382
This Air Canada deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/265:25 pm
YUL
-
DEN
Nonstop4h 30m
Air Canada
mar. 3/311:15 am
DEN
-
YUL
Nonstop3h 43m
Air Canada
Deal found 1/28$384
This Air Canada deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/195:25 pm
YUL
-
DEN
Nonstop4h 30m
Air Canada
mar. 2/2411:15 am
DEN
-
YUL
Nonstop3h 43m
Air Canada
Deal found 1/27$385
This Mytrip deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/1910:10 am
YUL
-
DEN
1 stop8h 30m
Air Canada
mié. 2/258:05 am
DEN
-
YUL
1 stop9h 20m
Air Canada
Deal found 1/27$387
This Air Canada deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/2412:30 pm
YTZ
-
DEN
1 stop9h 25m
Air Canada
mar. 3/311:15 am
DEN
-
YTZ
1 stop6h 40m
Air Canada
Deal found 1/27$387

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 enero 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$363
(Kiwi.com)

One-way from

$137
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$458

Good round-trip deal

$445 or less

Good one-way deal

$263 or less
Provider with most accurate pricing for Toronto (YTO)-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-Denver Intl flights.
Search Deals
From Ontario to Colorado
Search Deals
One-way flight from Ontario to Colorado
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 2,558,603 searches. Data last updated enero 29, 2026.
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

mar. 2/24

12:30 pm-7:55 pm

1 stop9h 25m

Denver Intl

mar. 3/3

11:15 am-7:55 pm

1 stop6h 40m

$387

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

jue. 3/19

8:30 am-10:23 am

Nonstop3h 53m

Denver Intl

mar. 3/24

8:05 am-9:37 pm

1 stop11h 32m

$389

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

jue. 2/26

2:50 pm-4:40 pm

Nonstop3h 50m

Denver Intl

dom. 3/1

5:30 pm-10:41 pm

Nonstop3h 11m

$390

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

mié. 4/1

1:00 pm-7:55 pm

1 stop8h 55m

Denver Intl

dom. 4/5

6:05 pm-11:16 pm

Nonstop3h 11m

$393

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

sáb. 2/28

4:45 pm-11:38 am

2 stops20h 53m

Denver Intl

lun. 3/2

7:52 pm-3:35 pm

1 stop17h 43m

$401

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

vie. 4/10

10:10 am-4:35 pm

1 stop8h 25m

Denver Intl

lun. 4/13

8:45 am-9:03 pm

1 stop10h 18m

$403

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

lun. 2/9

4:20 pm-8:20 am

1 stop18h 00m

Denver Intl

lun. 3/2

6:21 pm-12:39 am

2 stops28h 18m

$416

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

jue. 3/19

1:30 pm-11:54 pm

2 stops12h 24m

Denver Intl

mar. 3/24

4:38 pm-1:10 pm

1 stop18h 32m

$417

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

mié. 2/25

4:45 pm-10:42 am

2 stops19h 57m

Denver Intl

mié. 3/4

11:38 am-3:35 pm

2 stops25h 57m

$419

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

dom. 3/15

10:15 pm-3:56 am

2 stops31h 41m

Denver Intl

dom. 3/22

7:05 pm-6:43 am

1 stop9h 38m

$422

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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, September is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of $218). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of $317). 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 enero 29, 2026.

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 enero 29, 2026.

The most flights from CAON to USCO are scheduled on a Monday (7 on average). You will have fewer flight options on Saturday, 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 enero 29, 2026.
Peruse reviews from past customers who have flown with United Airlines, WestJet, and Air Canada from Ontario to Colorado to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,215 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,215 reviews
United Airlines
7.4
Good
9,215 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
WestJet
7.2
Good
3,253 reviews
United Airlines
7.4
Good
9,215 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
Air Canada
7.1
Good
10,667 reviews
United Airlines
7.4
Good
9,215 reviews

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

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?

    For as low as $387, Air Canada can have you in Colorado from Region of Ontario in 9h 25m. Region of Ontario and Colorado are separated by a distance of 1322 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Region of Ontario to Colorado one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $160. However, be on the lookout for offers from Air Canada and Delta, as they are both options that can get you from Region of Ontario to Colorado for a low price.

  • 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 $218). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of $317). 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 2 airlines flying from Ontario to Colorado

Discover the top 2 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 2,558,603 searches. Data last updated enero 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$218Average$535FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$267Average$537FlexibilityNo cancel feeOn-time67%

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