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$105+ 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Colorado to Ontario

Keep the following information in mind while searching for Colorado to Ontario flight deals. Data was last updated September 15, 2025.

Round-trip from

$229
(Kiwi.com)

One-way from

$105
(FlightHub)

Popular in

February

Cheapest in

March

Average price

$478

Good round-trip deal

$504 or less

Good one-way deal

$230 or less
From Colorado to Ontario
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One-way flight from Colorado to Ontario
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High demand for flights, 26% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Colorado to Ontario.
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Price to beat on a one-way flight from Colorado to Ontario.
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Find 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 September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/158:00 amDEN - YYZ
2 stops12h 52mMultiple Airlines
Mon 10/204:00 pmYYZ - DEN
1 stop18h 12mMultiple Airlines
Deal found 9/14$229
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/1312:15 pmDEN - YYZ
1 stop8h 37mMultiple Airlines
Mon 10/204:00 pmYYZ - DEN
1 stop18h 12mMultiple Airlines
Deal found 9/15$231
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/2010:29 pmDEN - YYZ
2 stops22h 23mMultiple Airlines
Fri 10/248:05 pmYYZ - DEN
1 stop9h 54mMultiple Airlines
Deal found 9/15$232
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/1610:55 pmDEN - YYZ
2 stops19h 57mMultiple Airlines
Mon 10/204:00 pmYYZ - DEN
1 stop18h 12mMultiple Airlines
Deal found 9/13$234
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/217:00 amDEN - YYZ
2 stops13h 52mMultiple Airlines
Sun 10/264:00 pmYYZ - DEN
1 stop18h 12mMultiple Airlines
Deal found 9/15$235
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/319:05 amDEN - YYZ
1 stop8h 55mMultiple Airlines
Sun 11/28:00 pmYYZ - DEN
1 stop29h 16mMultiple Airlines
Deal found 9/14$242
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Sat 10/1810:45 amDEN - YYZ
2 stops17h 27mMultiple Airlines
Fri 10/248:05 pmYYZ - DEN
1 stop9h 54mMultiple Airlines
Deal found 9/15$246
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/238:21 pmDEN - YYZ
1 stop22h 46mMultiple Airlines
Sun 10/268:00 pmYYZ - DEN
1 stop23h 07mMultiple Airlines
Deal found 9/14$247
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/1610:55 pmDEN - YYZ
1 stop30h 04mMultiple Airlines
Tue 10/2111:00 amYYZ - DEN
2 stops14h 10mMultiple Airlines
Deal found 9/13$249
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/1410:55 pmDEN - YYZ
1 stop30h 04mMultiple Airlines
Tue 10/212:00 pmYYZ - DEN
2 stops15h 59mMultiple Airlines
Deal found 9/14$252
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/308:28 pmDEN - YOW
1 stop15h 36mUnited Airlines
Thu 10/165:15 amYOW - DEN
1 stop8h 43mUnited Airlines
Deal found 9/15$286
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/88:00 amDEN - YUL
2 stops14h 27mMultiple Airlines
Sat 10/115:30 pmYUL - DEN
1 stop19h 54mMultiple Airlines
Deal found 9/14$293

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 September 15, 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

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 9/30

8:28 pm-2:04 pm

1 stop15h 36m

Ottawa

Thu 10/16

5:15 am-11:58 am

1 stop8h 43m

$286

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Fri 10/3

11:59 pm-2:13 pm

1 stop12h 14m

Ottawa

Tue 10/7

11:55 am-4:29 pm

1 stop6h 34m

$286

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Mon 10/20

8:28 pm-2:04 pm

1 stop15h 36m

Ottawa

Fri 10/24

5:15 am-11:58 am

1 stop8h 43m

$286

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Wed 10/15

11:59 pm-9:11 am

1 stop7h 12m

Ottawa

Wed 10/22

5:15 am-10:04 am

1 stop6h 49m

$286

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Wed 10/15

10:29 pm-12:22 am

2 stops23h 53m

Ottawa

Wed 10/22

4:25 pm-8:15 am

1 stop17h 50m

$297

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 9/30

10:55 pm-9:50 pm

1 stop20h 55m

Toronto Pearson Intl

Fri 10/3

7:45 pm-6:04 pm

1 stop24h 19m

$299

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 9/26

1:12 pm-2:05 pm

2 stops22h 53m

Toronto Pearson Intl

Mon 9/29

4:00 pm-9:33 am

1 stop19h 33m

$323

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 11/13

11:59 pm-3:23 pm

2 stops13h 24m

Ottawa

Sun 11/16

12:05 pm-4:40 pm

1 stop6h 35m

$328

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 10/24

11:15 am-7:49 pm

1 stop6h 34m

Toronto Island

Fri 10/31

12:30 pm-7:55 pm

1 stop9h 25m

$333

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Sat 10/18

12:00 pm-12:27 am

2 stops10h 27m

Montreal Pierre Elliott Trudeau Intl

Sat 10/25

6:45 am-8:15 am

1 stop27h 30m

$333

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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, January is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $243). Flying from Colorado to Region of Ontario in August is currently the most expensive (average of $348). 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 September 15, 2025.

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 September 15, 2025.

The most flights from USCO to CAON are scheduled on a Monday (11 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (10 on average).

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

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 September 15, 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
8.0
Very good
7,954 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,929 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
WestJet
7.2
Good
3,091 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Boarding

8.2

Crew

8.5

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 6h 34m. The distance between Colorado and Region of Ontario is about 1322 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 WestJet, with whom users have recently found tickets for as low as $105. However, be on the lookout for offers from United Airlines and Air Canada, 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, January is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $243). Flying from Colorado to Region of Ontario in August is currently the most expensive (average of $348). 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$143Average$303FlexibilityNo cancel feeOn-time60%
DeltaCheapest$144Average$176FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$180Average$506FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$211Average$666FlexibilityNo cancel feeOn-time67%

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