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Cheap flights from Colorado to Ontario from C$ 181

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 14/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
5 Aug — 12 Aug1
1 adult

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 31 July 2025.

Round-trip from

C$ 393

One-way from

C$ 181

Popular in

November

Cheapest in

March

Average price

C$ 720

Good round-trip deal

C$ 546 or less

Good one-way deal

C$ 249 or less
WestJet
  • WestJet
  • 3/9-7/9
  • 2 total stops
  • 20h 55m total
  • Colorado to Ontario
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14/9
  • 14/9
  • 1 total stop
  • 23h 55m total
  • Colorado to Ontario
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Highest demand for flights based on searches. 7% potential increase in price (C$ 71 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
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Average for round-trip flights in July 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 31 July 2025.

Wed 3/912:15 p.m.DEN - YYZ
1 stop10h 07mWestJet
Sun 7/910:00 a.m.YYZ - DEN
1 stop10h 48mWestJet
Deal found 30/7C$ 393
Thu 4/912:15 p.m.DEN - YYZ
1 stop16h 25mMultiple Airlines
Sun 7/99:40 p.m.YYZ - DEN
1 stop15h 44mMultiple Airlines
Deal found 29/7C$ 404
Sat 13/95:50 p.m.DEN - YTZ
1 stop16h 27mMultiple Airlines
Tue 16/93:35 p.m.YTZ - DEN
1 stop19h 38mMultiple Airlines
Deal found 29/7C$ 417
Mon 18/89:40 a.m.DEN - YTZ
1 stop8h 06mAir Canada
Sun 24/812:25 p.m.YTZ - DEN
1 stop7h 55mAir Canada
Deal found 28/7C$ 439
Thu 4/912:15 p.m.DEN - YHM
1 stop10h 25mWestJet
Sun 7/96:00 a.m.YHM - DEN
1 stop14h 48mWestJet
Deal found 30/7C$ 457
Mon 18/87:45 a.m.DEN - YYZ
Nonstop3h 13mAir Canada
Sun 24/86:20 p.m.YYZ - DEN
Nonstop3h 40mAir Canada
Deal found 28/7C$ 457
Fri 5/912:15 p.m.DEN - YKF
1 stop15h 00mMultiple Airlines
Sun 7/96:00 a.m.YKF - DEN
1 stop14h 48mMultiple Airlines
Deal found 30/7C$ 463
Wed 3/912:15 p.m.DEN - YUL
1 stop23h 55mMultiple Airlines
Fri 5/96:45 a.m.YUL - DEN
2 stops16h 27mMultiple Airlines
Deal found 29/7C$ 472
Thu 25/912:15 p.m.DEN - YHM
1 stop10h 25mMultiple Airlines
Sat 27/96:55 p.m.YHM - DEN
1 stop18h 29mMultiple Airlines
Deal found 29/7C$ 473
Tue 26/812:15 p.m.DEN - YUL
1 stop10h 28mWestJet
Tue 2/97:00 a.m.YUL - DEN
1 stop30h 24mWestJet
Deal found 29/7C$ 483
Mon 25/812:15 p.m.DEN - YOW
1 stop10h 26mWestJet
Thu 28/87:15 p.m.YOW - DEN
1 stop18h 12mWestJet
Deal found 30/7C$ 505
Tue 19/86:27 a.m.COS - YUL
1 stop6h 27mAmerican Airlines
Fri 22/83:44 p.m.YUL - COS
1 stop20h 18mAmerican Airlines
Deal found 29/7C$ 508

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 31 July 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

Wed 3/9

12:15 p.m.-12:22 a.m.

1 stop10h 07m

Toronto Pearson Intl

Sun 7/9

10:00 a.m.-6:48 p.m.

1 stop10h 48m

C$ 393

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 4/9

12:15 p.m.-6:40 a.m.

1 stop16h 25m

Toronto Pearson Intl

Sun 7/9

9:40 p.m.-11:24 a.m.

1 stop15h 44m

C$ 404

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Sat 13/9

5:50 p.m.-12:17 p.m.

1 stop16h 27m

Toronto Island

Tue 16/9

3:35 p.m.-9:13 a.m.

1 stop19h 38m

C$ 417

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Mon 18/8

9:40 a.m.-7:46 p.m.

1 stop8h 06m

Toronto Island

Sun 24/8

12:25 p.m.-6:20 p.m.

1 stop7h 55m

C$ 439

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Thu 4/9

12:15 p.m.-12:40 a.m.

1 stop10h 25m

Hamilton

Sun 7/9

6:00 a.m.-6:48 p.m.

1 stop14h 48m

C$ 457

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Mon 18/8

7:45 a.m.-12:58 p.m.

Nonstop3h 13m

Toronto Pearson Intl

Sun 24/8

6:20 p.m.-8:00 p.m.

Nonstop3h 40m

C$ 457

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Fri 5/9

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

1 stop15h 00m

Toronto Region of Waterloo Intl

Sun 7/9

6:00 a.m.-6:48 p.m.

1 stop14h 48m

C$ 463

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Wed 3/9

12:15 p.m.-2:10 p.m.

1 stop23h 55m

Montreal Pierre Elliott Trudeau Intl

Fri 5/9

6:45 a.m.-9:12 p.m.

2 stops16h 27m

C$ 472

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Thu 25/9

12:15 p.m.-12:40 a.m.

1 stop10h 25m

Hamilton

Sat 27/9

6:55 p.m.-11:24 a.m.

1 stop18h 29m

C$ 473

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 26/8

12:15 p.m.-12:43 a.m.

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 2/9

7:00 a.m.-11:24 a.m.

1 stop30h 24m

C$ 483

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/7

Showing 1-10 of 57 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$ 167). 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 31 July 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 31 July 2025.

The most flights from USCO to CAON are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (9 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 31 July 2025.
Read reviews from past customers who have flown Alaska Airlines,Delta, andUnited Airlines from Colorado to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,902 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
WestJet
7.2
Good
2,977 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.

  • 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$ 183. Users have also found prices from C$ 218 and C$ 230 on Air Canada 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$ 167). 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 31 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 170AverageC$ 797FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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

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Not ready to book yet? You can track prices for flights from Colorado to Ontario on Cheapflights with our Price Alert feature and get notified when better prices are available.

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