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Cheap flights from Colorado to Ontario from C$ 119

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
1 Mar — 8 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Colorado to Ontario

Enter your travel dates to find the best prices.

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 30 January 2026.

Tue 3/36:20 p.m.
DEN
-
YYZ
1 stop18h 00m
Multiple Airlines
Fri 6/39:35 a.m.
YYZ
-
DEN
1 stop16h 44m
Multiple Airlines
Deal found 29/1C$ 334
Wed 25/310:30 p.m.
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Tue 7/49:35 a.m.
YYZ
-
DEN
1 stop16h 45m
Multiple Airlines
Deal found 28/1C$ 353
Wed 1/410:30 p.m.
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Mon 6/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 28/1C$ 354
Sun 1/310:34 p.m.
DEN
-
YYZ
1 stop30h 09m
Multiple Airlines
Sun 8/38:00 p.m.
YYZ
-
DEN
1 stop30h 19m
Multiple Airlines
Deal found 30/1C$ 362
Tue 24/212:56 p.m.
DEN
-
YYZ
2 stops15h 17m
Multiple Airlines
Thu 26/28:35 p.m.
YYZ
-
DEN
1 stop13h 52m
Multiple Airlines
Deal found 29/1C$ 364
Tue 31/310:30 p.m.
DEN
-
YYZ
2 stops22h 41m
Multiple Airlines
Mon 6/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 28/1C$ 369
Sat 28/210:34 p.m.
DEN
-
YYZ
1 stop30h 09m
Multiple Airlines
Sat 7/311:15 a.m.
YYZ
-
DEN
2 stops15h 01m
Multiple Airlines
Deal found 29/1C$ 373
Mon 9/37:00 a.m.
DEN
-
YYZ
1 stop15h 14m
Multiple Airlines
Tue 10/31:30 p.m.
YYZ
-
DEN
2 stops16h 26m
Multiple Airlines
Deal found 28/1C$ 379
Mon 4/56:15 a.m.
DEN
-
YTZ
1 stop12h 00m
Multiple Airlines
Wed 13/54:00 p.m.
YTZ
-
DEN
1 stop22h 58m
Multiple Airlines
Deal found 29/1C$ 388
Fri 27/29:41 a.m.
DEN
-
YTZ
1 stop27h 51m
Multiple Airlines
Fri 6/39:15 a.m.
YTZ
-
DEN
1 stop13h 19m
Multiple Airlines
Deal found 29/1C$ 391
Fri 1/56:15 a.m.
DEN
-
YTZ
1 stop12h 00m
Multiple Airlines
Wed 13/58:50 a.m.
YTZ
-
DEN
2 stops15h 08m
Multiple Airlines
Deal found 29/1C$ 430
Wed 25/21:39 p.m.
DEN
-
YTZ
1 stop21h 31m
Multiple Airlines
Wed 4/38:55 a.m.
YTZ
-
DEN
1 stop9h 27m
Multiple Airlines
Deal found 28/1C$ 438

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 30 January 2026.

Round-trip from

C$ 334

One-way from

C$ 119

Popular in

December

Cheapest in

January

Average price

C$ 429

Good round-trip deal

C$ 821 or less
3/3-6/3
  • 3/3-6/3
  • 2 total stops
  • 34h 44m total
  • Colorado to Ontario
Search Deals
10/3
  • 10/3
  • 1 total stop
  • 12h 21m total
  • Colorado to Ontario
Search Deals
High demand for flights, 2% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 15 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

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 629,999 searches. Data last updated 30 January 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 - YYZ

DENYYZ

Denver Intl

Tue 3/3

11:59 p.m.-2:20 p.m.

1 stop12h 21m

Toronto Pearson Intl

Fri 6/3

8:00 p.m.-10:54 p.m.

2 stops28h 54m

C$ 356

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 27/2

9:41 a.m.-3:32 p.m.

1 stop27h 51m

Toronto Island

Fri 6/3

9:15 a.m.-8:34 p.m.

1 stop13h 19m

C$ 391

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Sun 15/3

10:30 p.m.-6:43 a.m.

1 stop30h 13m

Toronto Pearson Intl

Fri 20/3

8:00 p.m.-3:56 a.m.

1 stop9h 56m

C$ 435

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Wed 25/2

1:39 p.m.-1:10 p.m.

1 stop21h 31m

Toronto Island

Wed 4/3

8:55 a.m.-4:22 p.m.

1 stop9h 27m

C$ 438

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 17/2

11:59 p.m.-12:14 a.m.

1 stop22h 15m

Toronto Pearson Intl

Thu 19/2

8:00 p.m.-3:56 a.m.

1 stop9h 56m

C$ 461

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 26/2

6:00 a.m.-5:25 p.m.

2 stops33h 25m

Ottawa

Thu 5/3

4:20 p.m.-8:20 a.m.

1 stop18h 00m

C$ 465

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Tue 2/6

12:15 p.m.-7:50 p.m.

1 stop29h 35m

Toronto Region of Waterloo Intl

Thu 4/6

8:40 p.m.-11:20 a.m.

1 stop16h 40m

C$ 472

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Mon 4/5

12:15 p.m.-5:15 p.m.

1 stop27h 00m

Hamilton

Tue 12/5

6:10 p.m.-11:20 a.m.

1 stop19h 10m

C$ 491

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Mon 27/4

7:05 p.m.-6:20 a.m.

1 stop9h 15m

Toronto Pearson Intl

Fri 1/5

9:45 a.m.-9:42 a.m.

1 stop25h 57m

C$ 504

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Tue 17/2

7:00 p.m.-10:35 a.m.

2 stops13h 35m

Toronto Island

Thu 19/2

9:20 a.m.-6:23 p.m.

1 stop11h 03m

C$ 510

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/1

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 C$ 183). Flying from Colorado to Region of Ontario in January is currently the most expensive (average of C$ 302). 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 30 January 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 30 January 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 30 January 2026.
Read reviews from past customers who have flown United Airlines and Air Canada from Colorado to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,217 reviews
Check prices

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,217 reviews
United Airlines
7.4
Good
9,217 reviews
Check prices

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Air Canada
7.1
Good
10,668 reviews
United Airlines
7.4
Good
9,217 reviews
Check prices

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.6

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

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?

    Airlines like WestJet, Delta, and American Airlines fly from Colorado to Region of Ontario in about 12h 52m. The time it takes to get you to your destination can typically vary by up to 16h 43m. Airlines will cover a distance of 2585 km. This flight may include one or multiple stops.

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

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as C$ 71. Users have also found prices from C$ 224 and C$ 234 on United Airlines and Air Canada, respectively.

  • 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 C$ 183). Flying from Colorado to Region of Ontario in January is currently the most expensive (average of C$ 302). 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

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Top 2 airlines flying from Colorado to Ontario

Discover the top 2 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 629,999 searches. Data last updated 30 January 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 212AverageC$ 497FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 246AverageC$ 540FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Colorado to Ontario?

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Colorado to Ontario flexibly with Cheapflights today.

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