Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Colorado to Ontario from C$ 158

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 18/4. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
12 Apr — 19 Apr1
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 13 March 2026.

Tue 7/47:05 p.m.
DEN
-
YYZ
2 stops22h 31m
Multiple Airlines
Mon 13/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 8/3C$ 395
Wed 1/42:30 p.m.
DEN
-
YYZ
2 stops13h 43m
Multiple Airlines
Mon 13/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 8/3C$ 412
Thu 2/46:30 a.m.
DEN
-
YYZ
2 stops22h 13m
Multiple Airlines
Mon 13/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 8/3C$ 426
Tue 7/47:05 p.m.
DEN
-
YYZ
2 stops22h 31m
Multiple Airlines
Thu 16/48:00 p.m.
YYZ
-
DEN
1 stop28h 59m
Multiple Airlines
Deal found 8/3C$ 430
Mon 13/49:00 p.m.
DEN
-
YYZ
2 stops24h 20m
Multiple Airlines
Mon 20/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 9/3C$ 431
Wed 1/410:30 p.m.
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Mon 6/47:55 p.m.
YYZ
-
DEN
1 stop10h 04m
Multiple Airlines
Deal found 7/3C$ 441
Fri 24/46:00 a.m.
DEN
-
YYZ
2 stops15h 30m
Multiple Airlines
Tue 28/49:45 a.m.
YYZ
-
DEN
1 stop20h 14m
Multiple Airlines
Deal found 9/3C$ 442
Wed 1/410:30 p.m.
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Thu 16/47:45 a.m.
YYZ
-
DEN
2 stops14h 15m
Multiple Airlines
Deal found 8/3C$ 444
Thu 16/411:59 p.m.
DEN
-
YYZ
1 stop12h 21m
Multiple Airlines
Mon 20/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 7/3C$ 448
Wed 1/42:30 p.m.
DEN
-
YYZ
2 stops13h 43m
Multiple Airlines
Fri 10/47:55 p.m.
YYZ
-
DEN
1 stop10h 04m
Multiple Airlines
Deal found 8/3C$ 450
Thu 9/45:30 a.m.
DEN
-
YUL
1 stop7h 14m
American Airlines
Thu 16/47:29 a.m.
YUL
-
DEN
1 stop16h 57m
American Airlines
Deal found 12/3C$ 458
Sun 10/56:13 a.m.
DEN
-
YUL
1 stop6h 31m
American Airlines
Sat 16/57:45 a.m.
YUL
-
DEN
2 stops11h 54m
American Airlines
Deal found 13/3C$ 471

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 13 March 2026.

Round-trip from

C$ 395

One-way from

C$ 158

Popular in

February

Cheapest in

September

Average price

C$ 770

Good round-trip deal

C$ 243 or less

Good one-way deal

C$ 328 or less
7/4-13/4
  • 7/4-13/4
  • 3 total stops
  • 32h 30m total
  • Colorado to Ontario
Search Deals
18/4
  • 18/4
  • 1 total stop
  • 9h 15m total
  • Colorado to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 114 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 629,999 searches. Data last updated 13 March 2026.
Use the filters below to find and compare flights from Colorado to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Colorado SpringsOttawa

COS - YOW

COSYOW

Colorado Springs

Mon 6/4

5:13 p.m.-1:59 p.m.

2 stops18h 46m

Ottawa

Sat 11/4

6:25 a.m.-10:57 a.m.

1 stop6h 32m

C$ 547
Quickest round-trip

Colorado SpringsOttawa

COS - YOW

COSYOW

Colorado Springs

Wed 29/4

6:00 a.m.-1:59 p.m.

1 stop5h 59m

Ottawa

Sat 2/5

6:25 a.m.-10:47 a.m.

1 stop6h 22m

C$ 563

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 15/5

7:15 a.m.-5:45 a.m.

2 stops20h 30m

Toronto Pearson Intl

Mon 18/5

9:30 a.m.-3:49 p.m.

1 stop8h 19m

C$ 597

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 17/4

6:15 a.m.-6:47 p.m.

1 stop10h 32m

Toronto Island

Sun 19/4

8:40 a.m.-11:19 p.m.

2 stops16h 39m

C$ 622

Colorado SpringsToronto

COS - YYZ

COSYYZ

Colorado Springs

Thu 23/4

1:14 p.m.-11:59 p.m.

1 stop8h 45m

Toronto Pearson Intl

Thu 30/4

7:45 a.m.-12:17 p.m.

1 stop6h 32m

C$ 661

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Wed 8/4

11:59 p.m.-11:58 p.m.

1 stop21h 59m

Ottawa

Wed 15/4

7:00 a.m.-10:29 p.m.

2 stops17h 29m

C$ 661

Colorado SpringsToronto

COS - YYZ

COSYYZ

Colorado Springs

Wed 15/4

1:33 p.m.-9:32 p.m.

1 stop5h 59m

Toronto Pearson Intl

Mon 20/4

4:18 p.m.-9:57 p.m.

1 stop7h 39m

C$ 661

Colorado SpringsToronto

COS - YYZ

COSYYZ

Colorado Springs

Wed 22/4

1:33 p.m.-9:32 p.m.

1 stop5h 59m

Toronto Pearson Intl

Sat 25/4

3:53 p.m.-9:31 p.m.

1 stop7h 38m

C$ 661

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Mon 13/4

3:05 p.m.-11:40 a.m.

2 stops18h 35m

Toronto Island

Mon 20/4

9:25 a.m.-8:11 p.m.

1 stop12h 46m

C$ 668

Colorado SpringsOttawa

COS - YOW

COSYOW

Colorado Springs

Wed 29/4

1:33 p.m.-1:36 a.m.

2 stops10h 03m

Ottawa

Sat 2/5

7:00 a.m.-2:24 p.m.

2 stops9h 24m

C$ 687

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/3

Showing 1-10 of 60 resultsSorted by cheapest first
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, March is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of C$ 212). Flying from Colorado to Region of Ontario in April is currently the most expensive (average of C$ 499). 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 13 March 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 13 March 2026.

The most flights from USCO to CAON are scheduled on a Monday (8 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 13 March 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
9,418 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

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
9,418 reviews
United Airlines
7.4
Good
9,418 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

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
10,800 reviews
United Airlines
7.4
Good
9,418 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

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 United Airlines, Delta, and Air Canada fly from Colorado to Region of Ontario in about 8h 12m. The time it takes to get you to your destination can typically vary by up to 10h 34m. Airlines will cover a distance of 2128 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$ 72. Users have also found prices from C$ 226 and C$ 235 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, March is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of C$ 212). Flying from Colorado to Region of Ontario in April is currently the most expensive (average of C$ 499). 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.
Los Angeles to Vancouver Intl flights
Newark to Toronto Island flights
John F Kennedy Intl to Vancouver Intl flights
San Francisco to Vancouver Intl flights
Newark to Pearson Intl flights
Newark to Pierre Elliott Trudeau Intl flights
LaGuardia to Pearson Intl flights
Newark to Vancouver Intl flights
John F Kennedy Intl to Pearson Intl flights
LaGuardia to Pierre Elliott Trudeau Intl flights
John F Kennedy Intl to Pierre Elliott Trudeau Intl flights
O'Hare Intl to Vancouver Intl flights
Newark to Calgary flights
Los Angeles to Pearson Intl flights
John F Kennedy Intl to Calgary flights
Dulles Intl to Vancouver Intl flights
O'Hare Intl to Pearson Intl flights
Dulles Intl to Pearson Intl flights
Hobby to Vancouver Intl flights
San Francisco to Pearson Intl flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
Reagan-National to Pearson Intl flights
O'Hare Intl to Calgary flights
Dallas/Fort Worth to Pearson Intl flights
George Bush Intcntl to Vancouver Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
Los Angeles to Calgary flights
Denver to Vancouver Intl flights
San Francisco to Calgary flights
Boston to Pierre Elliott Trudeau Intl flights
Los Angeles to Pierre Elliott Trudeau Intl flights
LaGuardia to Vancouver Intl flights
Boston to Pearson Intl flights
O'Hare Intl to Pierre Elliott Trudeau Intl flights
Boston to Vancouver Intl flights
Boston to Toronto Island flights
Minneapolis to Vancouver Intl flights
Dallas/Fort Worth to Vancouver Intl flights
San Diego to Vancouver Intl flights
Atlanta to Vancouver Intl flights
Seattle to Pearson Intl flights
Hobby to Calgary flights
San Francisco to Pierre Elliott Trudeau Intl flights
Boston to Calgary flights
Dulles Intl to Calgary flights
Ontario to Vancouver Intl flights
Sacramento to Vancouver Intl flights
Dallas/Fort Worth to Pierre Elliott Trudeau Intl flights
LaGuardia to Calgary flights
Dulles Intl to Toronto Island flights

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 13 March 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 213AverageC$ 498FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 248AverageC$ 602FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from Colorado today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Colorado to Ontario?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Colorado to Ontario.

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.

Can Cheapflights notify me if prices for flights from Colorado to Ontario become cheaper?

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.

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.