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Cheap flights from Colorado to Ontario from C$ 155

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 17/11. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 11 September 2025.

Round-trip from

C$ 317

One-way from

C$ 155

Popular in

November

Cheapest in

March

Average price

C$ 633

Good round-trip deal

C$ 277 or less

Good one-way deal

C$ 299 or less
28/9-29/9
  • 28/9-29/9
  • 3 total stops
  • 24h 37m total
  • Colorado to Ontario
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17/11
  • 17/11
  • 2 total stops
  • 11h 39m total
  • Colorado to Ontario
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Highest demand for flights based on searches. 5% potential increase in price (C$ 51 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 15 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 11 September 2025.

Sun 28/912:15 p.m.DEN - YYZ
1 stop8h 37mMultiple Airlines
Mon 29/92:00 p.m.YYZ - DEN
2 stops16h 00mMultiple Airlines
Deal found 9/9C$ 317
Wed 8/108:00 a.m.DEN - YYZ
2 stops12h 52mMultiple Airlines
Tue 14/107:15 a.m.YYZ - DEN
1 stop18h 01mMultiple Airlines
Deal found 9/9C$ 319
Thu 2/108:59 p.m.DEN - YYZ
1 stop22h 08mMultiple Airlines
Sun 5/108:00 p.m.YYZ - DEN
1 stop14h 09mMultiple Airlines
Deal found 9/9C$ 320
Fri 3/1012:15 p.m.DEN - YYZ
1 stop10h 07mMultiple Airlines
Sun 5/108:00 p.m.YYZ - DEN
1 stop14h 09mMultiple Airlines
Deal found 9/9C$ 321
Mon 29/912:15 p.m.DEN - YYZ
1 stop8h 37mMultiple Airlines
Wed 1/103:00 p.m.YYZ - DEN
2 stops15h 00mMultiple Airlines
Deal found 9/9C$ 324
Fri 3/1012:15 p.m.DEN - YYZ
1 stop10h 07mWestJet
Sat 4/1010:25 p.m.YYZ - DEN
1 stop14h 59mWestJet
Deal found 9/9C$ 327
Thu 2/108:59 p.m.DEN - YYZ
1 stop22h 08mMultiple Airlines
Tue 7/1011:00 a.m.YYZ - DEN
2 stops14h 10mMultiple Airlines
Deal found 9/9C$ 328
Sun 28/912:15 p.m.DEN - YYZ
1 stop8h 37mMultiple Airlines
Tue 30/99:30 a.m.YYZ - DEN
1 stop20h 30mMultiple Airlines
Deal found 9/9C$ 330
Tue 4/1112:10 p.m.DEN - YYZ
1 stop8h 50mMultiple Airlines
Fri 7/119:45 a.m.YYZ - DEN
1 stop16h 08mMultiple Airlines
Deal found 9/9C$ 334
Mon 13/1012:15 p.m.DEN - YYZ
1 stop16h 37mMultiple Airlines
Wed 15/102:00 p.m.YYZ - DEN
2 stops15h 59mMultiple Airlines
Deal found 9/9C$ 337
Tue 4/1112:10 p.m.DEN - YYZ
1 stop8h 50mMultiple Airlines
Mon 10/119:35 a.m.YYZ - DEN
1 stop16h 18mMultiple Airlines
Deal found 9/9C$ 338
Sat 8/118:41 p.m.DEN - YTZ
1 stop15h 01mMultiple Airlines
Mon 10/119:15 a.m.YTZ - DEN
1 stop7h 01mMultiple Airlines
Deal found 9/9C$ 405

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 11 September 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

Mon 29/9

12:15 p.m.-10:52 p.m.

1 stop8h 37m

Toronto Pearson Intl

Wed 1/10

3:00 p.m.-4:00 a.m.

2 stops15h 00m

C$ 324

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 17/10

8:21 p.m.-9:07 p.m.

1 stop22h 46m

Toronto Pearson Intl

Tue 21/10

9:30 a.m.-11:10 p.m.

1 stop15h 40m

C$ 358

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 30/10

12:16 a.m.-2:05 p.m.

1 stop11h 49m

Toronto Pearson Intl

Sun 2/11

4:00 p.m.-5:44 p.m.

1 stop27h 44m

C$ 380

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Wed 22/10

12:36 a.m.-10:40 p.m.

1 stop20h 04m

Toronto Pearson Intl

Mon 27/10

6:30 a.m.-3:59 a.m.

2 stops23h 29m

C$ 399

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Tue 21/10

8:22 p.m.-12:17 p.m.

1 stop13h 55m

Toronto Island

Thu 23/10

3:35 p.m.-8:08 p.m.

1 stop6h 33m

C$ 413

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 3/10

12:15 p.m.-10:52 p.m.

1 stop8h 37m

Toronto Pearson Intl

Sun 5/10

9:00 a.m.-11:24 a.m.

2 stops28h 24m

C$ 420

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 17/10

8:58 p.m.-12:17 p.m.

1 stop13h 19m

Toronto Island

Tue 21/10

1:35 p.m.-8:30 p.m.

1 stop8h 55m

C$ 430

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 16/10

9:12 p.m.-8:02 p.m.

1 stop20h 50m

Toronto Island

Tue 21/10

1:35 p.m.-8:30 p.m.

1 stop8h 55m

C$ 430

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 30/9

7:05 p.m.-8:23 a.m.

1 stop11h 18m

Ottawa

Thu 16/10

5:15 a.m.-10:04 a.m.

1 stop6h 49m

C$ 432

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Fri 24/10

8:40 a.m.-5:15 a.m.

2 stops18h 35m

Toronto Region of Waterloo Intl

Fri 31/10

7:05 a.m.-12:37 p.m.

2 stops31h 32m

C$ 432

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

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 C$ 168). Flying from Colorado to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 11 September 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 11 September 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 11 September 2025.
Read reviews from past customers who have flown 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.
Air Canada
7.1
Good
10,000 reviews
Check prices

Entertainment

6.8

Food

6.3

Overall

7.1

Comfort

7.1

Crew

7.8

Boarding

7.3

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.
Air Canada
7.1
Good
10,000 reviews
Air Canada
7.1
Good
10,000 reviews
Check prices

Entertainment

6.8

Food

6.3

Overall

7.1

Comfort

7.1

Crew

7.8

Boarding

7.3

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.

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, Air Canada, and American Airlines fly from Colorado to Region of Ontario in about 8h 37m. The time it takes to get you to your destination can typically vary by up to 12h 17m. Airlines will cover a distance of 2111 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$ 172. Users have also found prices from C$ 184 and C$ 212 on United Airlines and Delta, 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, January is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of C$ 168). Flying from Colorado to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 airline flying from Colorado to Ontario

Discover the top airline 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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 171AverageC$ 754FlexibilityNo 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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Can Cheapflights find flights from Colorado to Ontario with no change fees?

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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