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Cheap flights from Denver to Ontario from C$ 157

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
9 Apr — 16 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Denver to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Denver to Ontario
Explore the most affordable flight options available from Denver to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 March 2026.

Tue 21/410:29 p.m.
DEN
-
YYZ
2 stops19h 07m
Multiple Airlines
Tue 28/49:45 a.m.
YYZ
-
DEN
1 stop20h 14m
Multiple Airlines
Deal found 7/3C$ 369
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$ 394
Thu 9/410:30 p.m.
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Mon 13/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 6/3C$ 399
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$ 411
Fri 10/48:15 a.m.
DEN
-
YYZ
2 stops20h 28m
Multiple Airlines
Mon 13/47:55 p.m.
YYZ
-
DEN
1 stop10h 04m
Multiple Airlines
Deal found 5/3C$ 418
Fri 17/46:26 a.m.
DEN
-
YYZ
2 stops22h 17m
Multiple Airlines
Mon 20/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 5/3C$ 422
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$ 425
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$ 429
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$ 430
Fri 17/46:15 a.m.
DEN
-
YTZ
1 stop10h 32m
Multiple Airlines
Mon 20/49:25 a.m.
YTZ
-
DEN
2 stops15h 04m
Multiple Airlines
Deal found 5/3C$ 449
Mon 20/411:59 p.m.
DEN
-
YUL
1 stop22h 31m
Multiple Airlines
Mon 27/48:00 a.m.
YUL
-
DEN
2 stops30h 14m
Multiple Airlines
Deal found 8/3C$ 483
Fri 17/46:15 a.m.
DEN
-
YTZ
1 stop10h 32m
Multiple Airlines
Sun 19/43:45 p.m.
YTZ
-
DEN
1 stop20h 27m
Multiple Airlines
Deal found 8/3C$ 486

Find flight deals from Denver to Ontario

Keep the following information in mind while searching for Denver to Ontario flight deals. Data was last updated 10 March 2026.

Round-trip from

C$ 369

One-way from

C$ 157

Popular in

February

Cheapest in

September

Average price

C$ 768

Good round-trip deal

C$ 242 or less

Good one-way deal

C$ 327 or less
21/4-28/4
  • 21/4-28/4
  • 3 total stops
  • 39h 21m total
  • Denver to Ontario
Search Deals
18/4
  • 18/4
  • 1 total stop
  • 9h 15m total
  • Denver to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 113 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 Denver Intl to Ontario.
Search Deals
Price to beat on a one-way flight from Denver Intl to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver 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 10 March 2026.
Use the filters below to find and compare flights from Denver to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 21/4

11:59 p.m.-5:13 p.m.

1 stop15h 14m

Ottawa

Tue 28/4

6:55 a.m.-3:59 a.m.

2 stops23h 04m

C$ 522

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Wed 13/5

4:36 p.m.-1:00 p.m.

1 stop18h 24m

Toronto Island

Sat 16/5

9:15 a.m.-4:04 p.m.

1 stop8h 49m

C$ 529

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 2/4

6:40 a.m.-7:30 p.m.

1 stop10h 50m

Toronto Island

Thu 9/4

9:25 a.m.-11:04 p.m.

2 stops15h 39m

C$ 560

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 1/5

6:00 a.m.-3:45 p.m.

1 stop31h 45m

Toronto Pearson Intl

Tue 5/5

4:55 p.m.-10:54 a.m.

1 stop19h 59m

C$ 563

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 24/4

8:00 a.m.-3:45 p.m.

1 stop29h 45m

Toronto Pearson Intl

Tue 28/4

4:55 p.m.-5:11 p.m.

1 stop26h 16m

C$ 611

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$ 620

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Wed 5/8

2:47 p.m.-4:00 p.m.

1 stop23h 13m

Toronto Island

Sun 9/8

10:50 a.m.-9:30 p.m.

1 stop12h 40m

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$ 666

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Sun 5/4

9:25 a.m.-11:58 p.m.

1 stop12h 33m

Ottawa

Sun 12/4

4:20 p.m.-3:59 a.m.

2 stops37h 39m

C$ 680

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Sat 6/6

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

1 stop27h 00m

Hamilton

Mon 8/6

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

1 stop19h 10m

C$ 692

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/3

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Denver to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Denver 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 Denver to Ontario

What is the cheapest month to book a flight from Denver to Region of Ontario?

Currently, March is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 212). Flying from Denver to Region of Ontario in April is currently the most expensive (average of C$ 498). 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 DEN to ON?

Find hourly flight availability from Denver 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 10 March 2026.

When flying from Denver to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Denver to Region of Ontario

Explore weekly flight availability from Denver 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 10 March 2026.

The most flights from DEN 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 10 March 2026.
Read through reviews of airlines operating flights from Denver to Ontario, such as United Airlines and Air Canada. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,409 reviews
Check prices

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

Entertainment

7.1

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
9,409 reviews
United Airlines
7.4
Good
9,409 reviews
Check prices

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

Entertainment

7.1

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
9,409 reviews
Check prices

Boarding

7.7

Comfort

7.3

Food

6.6

Overall

7.4

Crew

8.1

Entertainment

7.1

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 Denver to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Denver to Ontario?

    Located just 29.7 km from the city centre, Denver Intl (DEN) is the airport most travellers will use when flying to Ontario from Denver.

  • How long is the flight from Denver to Region of Ontario?

    Alaska Airlines, WestJet, and United Airlines can get you from Denver to Region of Ontario in just under 3h 19m. Your travel time can differ by up to 28h 26m. There are 2111 km between Denver and Region of Ontario. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    C$ 72 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on United Airlines and Air Canada, with prices starting from C$ 225 and C$ 234, respectively.

  • What are the most popular routes from Denver to Region of Ontario?

    The most popular route from Denver to Region of Ontario is Denver Intl - Montreal Pierre Elliott Trudeau Intl. You may also consider Denver Intl - Toronto Pearson Intl or Denver Intl - Toronto Island.

  • What are the most reliable airlines from Denver to Region of Ontario?

    No one likes to see their flight delayed. When booking a flight from Denver to Region of Ontario consider choosing Air Canada (67%), United Airlines (67%) or Austrian Airlines (67%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Denver to Region of Ontario?

    Looking for the cheapest flight from Denver to Region of Ontario? While on average our users pay C$ 538, our data indicates the cheapest price to be C$ 242. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around C$ 592.

  • Can I find deals for flights from Denver to Ontario that include hotel bookings?

    Yes. In addition to deals on Denver to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Ontario.

  • Can I find deals for business class flights from Denver to Ontario?

    Yes. Cheapflights offers flight deals from Denver 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 Denver to Region of Ontario?

    Currently, March is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 212). Flying from Denver to Region of Ontario in April is currently the most expensive (average of C$ 498). 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

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Top 2 airlines flying from Denver to Ontario

Discover the top 2 airlines that operate flights from Denver 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 10 March 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 213AverageC$ 496FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 247AverageC$ 600FlexibilityNo 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 Denver to Ontario?

When you search for this flight from Denver to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Cheapflights simply makes it quick and affordable to book flights from Denver to Ontario by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Denver to Ontario with no change fees?

Yes! Cheapflights helps users easily find flights from Denver to Ontario with no change fees.

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

Yes, Cheapflights offers price alerts on Denver to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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