HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$111+ 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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
ene. 11 — ene. 181
dom. 1/11
dom. 1/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Colorado to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 diciembre 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/9. 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. 12/3011:59 pmDEN - YYZ
2 stops17h 36mMultiple Airlines
lun. 1/127:55 pmYYZ - DEN
1 stop16h 47mMultiple Airlines
Deal found 12/9$430
This Kiwi.com deal was found by Cheapflights users on 12/9. 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. 12/302:16 pmDEN - YYZ
2 stops27h 19mMultiple Airlines
dom. 1/188:00 pmYYZ - DEN
1 stop9h 56mMultiple Airlines
Deal found 12/9$443
This Air Canada deal was found by Cheapflights users on 12/9. 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. 12/301:25 pmDEN - YYZ
Nonstop3h 10mAir Canada
lun. 1/128:30 amYYZ - DEN
Nonstop3h 53mAir Canada
Deal found 12/9$458
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
sáb. 12/137:33 amDEN - YYZ
1 stop10h 22mMultiple Airlines
lun. 12/155:15 pmYYZ - DEN
2 stops30h 34mMultiple Airlines
Deal found 12/9$476
This Kiwi.com deal was found by Cheapflights users on 12/9. 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. 12/306:00 amDEN - YYZ
1 stop13h 19mMultiple Airlines
lun. 1/510:15 pmYYZ - DEN
2 stops31h 43mMultiple Airlines
Deal found 12/9$492
This Kiwi.com deal was found by Cheapflights users on 12/10. 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. 12/304:36 pmDEN - YTZ
1 stop19h 06mMultiple Airlines
lun. 1/51:30 pmYTZ - DEN
2 stops10h 19mMultiple Airlines
Deal found 12/10$552
This deal was found by Cheapflights users on 12/11. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1911:15 amDEN - YTZ
1 stop6h 40mAir Canada
mar. 12/2310:30 amYTZ - DEN
1 stop11h 40mAir Canada
Deal found 12/11$587
This Air Canada deal was found by Cheapflights users on 12/9. 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. 12/2911:15 amDEN - YUL
Nonstop3h 43mAir Canada
lun. 1/59:00 pmYUL - DEN
1 stop17h 37mAir Canada
Deal found 12/9$599
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
mié. 12/1711:59 pmDEN - YUL
1 stop22h 31mMultiple Airlines
mar. 12/306:45 amYUL - DEN
2 stops28h 11mMultiple Airlines
Deal found 12/9$613
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
mié. 12/1711:00 amDEN - YUL
1 stop11h 30mMultiple Airlines
mié. 12/316:45 amYUL - DEN
2 stops29h 28mMultiple Airlines
Deal found 12/9$629
This Kiwi.com deal was found by Cheapflights users on 12/9. 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. 12/2111:59 pmDEN - YUL
1 stop22h 31mMultiple Airlines
mar. 12/306:45 amYUL - DEN
2 stops28h 11mMultiple Airlines
Deal found 12/9$631
This Air Canada deal was found by Cheapflights users on 12/9. 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. 12/2311:15 amDEN - YUL
Nonstop3h 43mAir Canada
mar. 12/305:25 pmYUL - DEN
Nonstop4h 30mAir Canada
Deal found 12/9$637

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 diciembre 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$255
(Kiwi.com)

One-way from

$111
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$575

Good round-trip deal

$567 or less

Good one-way deal

$280 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
Highest demand for flights based on searches. 0% potential increase in price ($1 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 diciembre 12, 2025.
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 - YYZ

DENYYZ

Denver Intl

dom. 1/11

6:02 pm-6:20 am

1 stop10h 18m

Toronto Pearson Intl

vie. 1/16

12:30 pm-11:22 pm

2 stops12h 52m

$286

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

mar. 1/13

9:50 am-10:10 pm

1 stop10h 20m

Toronto Island

sáb. 1/17

9:25 am-8:38 pm

1 stop13h 13m

$288

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

lun. 1/12

6:00 am-10:10 pm

2 stops14h 10m

Toronto Island

lun. 1/19

8:50 am-4:22 pm

1 stop9h 32m

$315

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

lun. 1/12

12:05 am-4:25 pm

2 stops14h 20m

Toronto Island

lun. 1/19

8:50 am-4:22 pm

1 stop9h 32m

$316

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

jue. 1/8

11:59 pm-4:25 pm

2 stops14h 26m

Toronto Island

mié. 1/14

8:50 am-8:16 pm

1 stop13h 26m

$316

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

sáb. 1/10

11:59 pm-5:13 pm

1 stop15h 14m

Ottawa

sáb. 1/17

9:40 am-8:00 pm

1 stop12h 20m

$319

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

sáb. 1/24

7:00 am-5:15 pm

1 stop8h 15m

Ottawa

dom. 2/1

4:15 pm-12:19 pm

2 stops46h 04m

$339

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

mar. 2/17

11:59 pm-11:58 pm

1 stop21h 59m

Ottawa

mar. 2/24

7:00 am-9:35 pm

2 stops40h 35m

$341

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

jue. 1/8

6:10 am-6:55 pm

1 stop10h 45m

Toronto Island

jue. 1/15

7:45 am-9:26 pm

2 stops15h 41m

$350

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

vie. 2/6

5:09 pm-3:35 pm

1 stop20h 26m

Toronto Pearson Intl

dom. 2/8

4:45 pm-11:35 pm

1 stop32h 50m

$353

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 60 results
1
2
3
...
6

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 $129). Flying from Colorado to Region of Ontario in February is currently the most expensive (average of $232). 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 diciembre 12, 2025.

It’s optimal to fly from Colorado to Region of Ontario in the afternoon. By choosing this option you can save up to 23% on the cost of your flight, compared to a flight in the evening.

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 diciembre 12, 2025.

The most flights from USCO to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Sunday, 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 diciembre 12, 2025.
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
8,008 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
8,008 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
9,095 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
3,194 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
10,514 reviews
Delta
7.9
Good
8,008 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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 3h 46m. The distance between Colorado and Region of Ontario is about 1606 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 United Airlines, with whom users have recently found tickets for as low as $150. However, be on the lookout for offers from Air Canada 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 $129). Flying from Colorado to Region of Ontario in February is currently the most expensive (average of $232). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Colorado to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Pearson Intl flights
LaGuardia to Pearson Intl flights
Newark to Pearson Intl flights
Los Angeles to Vancouver Intl flights
Newark to Toronto Island flights
San Francisco to Vancouver Intl flights
John F Kennedy Intl to Vancouver Intl flights
Newark to Vancouver Intl flights
John F Kennedy Intl to Pierre Elliott Trudeau Intl flights
Newark to Pierre Elliott Trudeau Intl flights
LaGuardia to Pierre Elliott Trudeau Intl flights
Reagan-National to Pearson Intl flights
Denver to Vancouver Intl flights
O'Hare Intl to Vancouver Intl flights
Dulles Intl to Pearson Intl flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
San Diego to Vancouver Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
John F Kennedy Intl to Calgary flights
Hobby to Vancouver Intl flights
Boston to Pearson Intl flights
Los Angeles to Calgary flights
Newark to Calgary flights
Los Angeles to Pearson Intl flights
LaGuardia to Vancouver Intl flights
Dallas/Fort Worth to Vancouver Intl flights
San Francisco to Pearson Intl flights
Atlanta to Vancouver Intl flights
O'Hare Intl to Pearson Intl flights
George Bush Intcntl to Vancouver Intl flights
Hobby to Pearson Intl flights
Dallas/Fort Worth to Pearson Intl flights
Los Angeles to Pierre Elliott Trudeau Intl flights
O'Hare Intl to Calgary flights
Ontario to Vancouver Intl flights
Atlanta to Pearson Intl flights
Dulles Intl to Vancouver Intl flights
Seattle to Pearson Intl flights
O'Hare Intl to Pierre Elliott Trudeau Intl flights
Boston to Vancouver Intl flights
Boston to Pierre Elliott Trudeau Intl flights
Seattle to Calgary flights
Fort Lauderdale to Pierre Elliott Trudeau Intl flights
Boston to Toronto Island flights
George Bush Intcntl to Pearson Intl flights
Dulles Intl to Toronto Island flights
Newark to Québec City flights
Sacramento to Vancouver Intl flights
San Francisco to Abbotsford flights
Sky Harbor Intl to Pearson Intl flights

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 diciembre 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$143Average$303FlexibilityNo cancel feeOn-time60%
DeltaCheapest$144Average$176FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$180Average$513FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$218Average$532FlexibilityNo cancel feeOn-time67%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.