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$88+ Cheap flights from Colorado to Ontario

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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Colorado to Ontario

Cheapest flights from Colorado to Ontario
Explore the most affordable flight options available from Colorado to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 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.
Wed 4/110:30 pm
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Mon 4/68:00 pm
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 1/27$260
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.
Wed 3/2510:30 pm
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Tue 4/79:35 am
YYZ
-
DEN
1 stop16h 45m
Multiple Airlines
Deal found 1/28$261
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.
Mon 3/910:01 am
DEN
-
YYZ
1 stop18h 19m
Multiple Airlines
Wed 3/117:15 am
YYZ
-
DEN
1 stop17h 54m
Multiple Airlines
Deal found 1/27$264
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.
Tue 3/3110:30 pm
DEN
-
YYZ
2 stops19h 06m
Multiple Airlines
Mon 4/68:00 pm
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 1/27$270
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.
Tue 3/3110:30 pm
DEN
-
YYZ
2 stops22h 41m
Multiple Airlines
Tue 4/79:35 am
YYZ
-
DEN
1 stop16h 45m
Multiple Airlines
Deal found 1/28$273
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.
Mon 3/97:00 am
DEN
-
YYZ
1 stop15h 14m
Multiple Airlines
Tue 3/101:30 pm
YYZ
-
DEN
2 stops16h 26m
Multiple Airlines
Deal found 1/28$280
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Thu 4/166:15 am
DEN
-
YTZ
1 stop10h 42m
Multiple Airlines
Sun 4/192:30 pm
YTZ
-
DEN
1 stop24h 28m
Multiple Airlines
Deal found 1/26$281
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.
Wed 3/2510:30 pm
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Wed 4/810:00 am
YYZ
-
DEN
1 stop16h 31m
Multiple Airlines
Deal found 1/28$281
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.
Mon 3/307:05 pm
DEN
-
YYZ
1 stop9h 38m
Multiple Airlines
Mon 4/68:00 pm
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 1/27$283
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.
Wed 4/17:43 pm
DEN
-
YYZ
2 stops25h 37m
Multiple Airlines
Wed 4/810:00 am
YYZ
-
DEN
1 stop16h 31m
Multiple Airlines
Deal found 1/28$285
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.
Thu 2/197:35 pm
DEN
-
YTZ
1 stop16h 12m
Multiple Airlines
Wed 2/258:50 am
YTZ
-
DEN
1 stop9h 32m
Multiple Airlines
Deal found 1/27$305
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.
Wed 2/251:39 pm
DEN
-
YTZ
1 stop21h 31m
Multiple Airlines
Wed 3/48:55 am
YTZ
-
DEN
1 stop9h 27m
Multiple Airlines
Deal found 1/28$324

Find flight deals from Colorado to Ontario

Keep the following information in mind while searching for Colorado to Ontario flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$260
(Kiwi.com)

One-way from

$88
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$317

Good round-trip deal

$545 or less

Good one-way deal

$403 or less
Provider with most accurate pricing for Denver Intl-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Toronto (YTO) flights.
Search Deals
From Colorado to Ontario
Search Deals
One-way flight from Colorado to Ontario
Search Deals
High demand for flights, 1% potential price rise
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 Colorado to Ontario.
Search Deals
Price to beat on a one-way flight from Colorado to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Ontario 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 January 29, 2026.
Use the filters below to find and compare flights from Colorado to Ontario that are best for you.

Fly from

Colorado

Fly to

Ontario

Route

Depart

Return

Price

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 4/16

6:15 am-6:57 pm

1 stop10h 42m

Toronto Island

Sun 4/19

2:30 pm-12:58 pm

1 stop24h 28m

$281

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 2/26

9:30 am-6:43 am

2 stops19h 13m

Toronto Pearson Intl

Thu 3/5

8:35 pm-3:56 am

1 stop9h 21m

$303

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 2/19

7:35 pm-1:47 pm

1 stop16h 12m

Toronto Island

Wed 2/25

8:50 am-4:22 pm

1 stop9h 32m

$305

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Wed 2/25

1:39 pm-1:10 pm

1 stop21h 31m

Toronto Island

Wed 3/4

8:55 am-4:22 pm

1 stop9h 27m

$324

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 2/26

1:18 pm-6:43 am

1 stop15h 25m

Toronto Pearson Intl

Mon 3/2

3:40 pm-1:09 pm

2 stops23h 29m

$328

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 4/30

6:00 am-8:00 pm

1 stop12h 00m

Toronto Pearson Intl

Tue 5/5

9:45 am-12:19 am

1 stop16h 34m

$331

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 2/26

6:00 am-5:25 pm

2 stops33h 25m

Ottawa

Thu 3/5

4:20 pm-8:20 am

1 stop18h 00m

$344

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Wed 5/6

12:15 pm-12:10 am

1 stop9h 55m

Toronto Pearson Intl

Thu 5/7

3:50 pm-11:20 am

1 stop21h 30m

$358

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 4/30

6:00 am-8:00 pm

1 stop12h 00m

Toronto Pearson Intl

Wed 5/6

9:40 am-7:49 pm

1 stop12h 09m

$359

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 3/10

12:34 pm-3:35 pm

1 stop25h 01m

Toronto Pearson Intl

Mon 3/16

4:45 pm-12:14 pm

1 stop21h 29m

$394

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 60 results
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Best time to book a flight from Colorado to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Colorado 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 Colorado to Ontario

What is the cheapest month to book a flight from Colorado to Region of Ontario?

Currently, June is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $135). Flying from Colorado to Region of Ontario in January is currently the most expensive (average of $223). 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 CO to ON?

Find hourly flight availability from Colorado to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 29, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Region of Ontario as you normally would.

Weekly flight availability from Colorado to Region of Ontario

Explore weekly flight availability from Colorado to Ontario. 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 January 29, 2026.

The most flights from USCO to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated January 29, 2026.
See what other customers who have flown with Delta, United Airlines, and WestJet from Colorado to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,127 reviews

Overall

7.9

Entertainment

7.8

Food

7.2

Crew

8.5

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,127 reviews
Delta
7.9
Good
8,127 reviews

Overall

7.9

Entertainment

7.8

Food

7.2

Crew

8.5

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,215 reviews
Delta
7.9
Good
8,127 reviews

Overall

7.9

Entertainment

7.8

Food

7.2

Crew

8.5

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
WestJet
7.2
Good
3,253 reviews
Delta
7.9
Good
8,127 reviews

Overall

7.9

Entertainment

7.8

Food

7.2

Crew

8.5

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,667 reviews
Delta
7.9
Good
8,127 reviews

Overall

7.9

Entertainment

7.8

Food

7.2

Crew

8.5

Boarding

8.1

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Ontario. 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 Colorado to Region of Ontario?

    Departing from Colorado to Region of Ontario will take you 9h 55m. The distance between Colorado and Region of Ontario is about 1312 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as $124. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Colorado to Region of Ontario for a low price.

  • Can I find deals for flights from Colorado to Ontario that include hotel bookings?

    Yes. In addition to deals on Colorado to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Ontario.

  • Can I find deals for business class flights from Colorado to Ontario?

    Yes. Cheapflights offers flight deals from Colorado to Ontario 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 Colorado to Region of Ontario?

    Currently, June is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $135). Flying from Colorado to Region of Ontario in January is currently the most expensive (average of $223). 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 Colorado to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Colorado to Ontario

Discover the top 4 airlines that operate flights from Colorado to Ontario. 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$130Average$303FlexibilityNo cancel feeOn-time60%
DeltaCheapest$144Average$172FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$177Average$512FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$198Average$519FlexibilityNo cancel feeOn-time67%

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