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Cheap flights from Denver to Ontario from C$ 137

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 28/2. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
26 Feb — 5 Mar1
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 27 January 2026.

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 27/1C$ 356
Mon 9/310:01 a.m.
DEN
-
YYZ
1 stop18h 19m
Multiple Airlines
Wed 11/37:15 a.m.
YYZ
-
DEN
1 stop17h 54m
Multiple Airlines
Deal found 27/1C$ 361
Tue 31/310:30 p.m.
DEN
-
YYZ
2 stops19h 06m
Multiple Airlines
Mon 6/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 27/1C$ 370
Sun 22/210:34 p.m.
DEN
-
YYZ
1 stop30h 09m
Multiple Airlines
Fri 27/28:00 p.m.
YYZ
-
DEN
1 stop9h 56m
Multiple Airlines
Deal found 26/1C$ 375
Thu 16/46:15 a.m.
DEN
-
YTZ
1 stop10h 42m
Multiple Airlines
Sun 19/42:30 p.m.
YTZ
-
DEN
1 stop24h 28m
Multiple Airlines
Deal found 26/1C$ 385
Mon 30/37:05 p.m.
DEN
-
YYZ
1 stop9h 38m
Multiple Airlines
Mon 6/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 27/1C$ 388
Fri 27/26:21 p.m.
DEN
-
YYZ
1 stop10h 22m
Multiple Airlines
Thu 5/38:35 p.m.
YYZ
-
DEN
1 stop9h 21m
Multiple Airlines
Deal found 27/1C$ 389
Tue 31/310:30 p.m.
DEN
-
YYZ
2 stops19h 06m
Multiple Airlines
Sun 5/48:00 p.m.
YYZ
-
DEN
1 stop15h 05m
Multiple Airlines
Deal found 27/1C$ 396
Sun 29/37:05 p.m.
DEN
-
YYZ
1 stop9h 38m
Multiple Airlines
Mon 6/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 27/1C$ 400
Sat 28/38:00 a.m.
DEN
-
YYZ
2 stops14h 14m
Multiple Airlines
Mon 6/48:00 p.m.
YYZ
-
DEN
1 stop9h 59m
Multiple Airlines
Deal found 27/1C$ 403
Sun 29/37:05 p.m.
DEN
-
YYZ
1 stop9h 15m
Multiple Airlines
Tue 31/39:35 a.m.
YYZ
-
DEN
1 stop16h 44m
Multiple Airlines
Deal found 25/1C$ 404
Sun 3/56:15 a.m.
DEN
-
YTZ
1 stop12h 00m
Multiple Airlines
Wed 6/54:00 p.m.
YTZ
-
DEN
1 stop22h 58m
Multiple Airlines
Deal found 26/1C$ 416

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 27 January 2026.

Round-trip from

C$ 356

One-way from

C$ 137

Popular in

December

Cheapest in

January

Average price

C$ 434

Good round-trip deal

C$ 831 or less
1/4-6/4
  • 1/4-6/4
  • 2 total stops
  • 40h 12m total
  • Denver to Ontario
Search Deals
28/2
  • 28/2
  • 1 total stop
  • 30h 09m total
  • Denver to Ontario
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 14 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 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 27 January 2026.
Use the filters below to find and compare flights from Denver to Ontario that are best for you.

Fly from

Denver

Fly to

Ontario

Route

Depart

Return

Price

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 16/4

6:15 a.m.-6:57 p.m.

1 stop10h 42m

Toronto Island

Sun 19/4

2:30 p.m.-12:58 p.m.

1 stop24h 28m

C$ 385

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Sun 3/5

6:15 a.m.-8:15 p.m.

1 stop12h 00m

Toronto Island

Wed 6/5

4:00 p.m.-12:58 p.m.

1 stop22h 58m

C$ 416

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Wed 27/5

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

1 stop9h 55m

Toronto Pearson Intl

Mon 1/6

10:25 p.m.-11:20 a.m.

1 stop14h 55m

C$ 418

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Mon 16/3

7:05 p.m.-6:43 a.m.

1 stop9h 38m

Toronto Pearson Intl

Tue 17/3

2:20 p.m.-11:13 p.m.

1 stop10h 53m

C$ 442

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 7/5

6:15 a.m.-8:15 p.m.

1 stop12h 00m

Toronto Island

Mon 11/5

4:00 p.m.-12:09 p.m.

2 stops22h 09m

C$ 453

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 7/5

6:15 a.m.-8:15 p.m.

1 stop12h 00m

Toronto Island

Sun 10/5

4:00 p.m.-12:58 p.m.

1 stop22h 58m

C$ 455

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 13/2

10:30 p.m.-7:47 p.m.

1 stop19h 17m

Toronto Pearson Intl

Sun 22/2

7:55 p.m.-2:51 p.m.

2 stops20h 56m

C$ 529

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 10/3

12:34 p.m.-3:35 p.m.

1 stop25h 01m

Toronto Pearson Intl

Mon 16/3

4:45 p.m.-12:14 p.m.

1 stop21h 29m

C$ 539

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Sat 14/3

5:30 p.m.-10:41 p.m.

Nonstop3h 11m

Toronto Pearson Intl

Sat 21/3

8:30 a.m.-10:23 a.m.

Nonstop3h 53m

C$ 544

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Sat 28/2

7:00 a.m.-3:35 p.m.

1 stop30h 35m

Toronto Pearson Intl

Wed 4/3

4:45 p.m.-11:59 p.m.

1 stop33h 14m

C$ 555

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

Showing 1-10 of 60 results
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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, June is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 185). Flying from Denver to Region of Ontario in January is currently the most expensive (average of C$ 305). 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 27 January 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 27 January 2026.

The most flights from DEN 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 (3 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 27 January 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
9,205 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

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
9,205 reviews
United Airlines
7.4
Good
9,205 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

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
10,660 reviews
United Airlines
7.4
Good
9,205 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Boarding

7.7

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?

    WestJet, Alaska Airlines, and Air Canada can get you from Denver to Region of Ontario in just under 3h 11m. Your travel time can differ by up to 21h 50m. 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$ 227 and C$ 237, 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 - Toronto Pearson Intl. You may also consider Denver Intl - Montreal Pierre Elliott Trudeau 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 Austrian Airlines (65%), Air Canada (62%) or United Airlines (62%) 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$ 926, our data indicates the cheapest price to be C$ 294. The most popular route (Denver Intl - Toronto Pearson Intl), is priced around C$ 389.

  • 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, June is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 185). Flying from Denver to Region of Ontario in January is currently the most expensive (average of C$ 305). 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 Denver to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Vancouver Intl flights
Denver to Calgary flights
Denver to Pearson Intl flights
Denver to Pierre Elliott Trudeau Intl flights
Denver to Kelowna flights
Denver to Toronto Island flights
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Denver to Halifax flights
Denver to Edmonton flights
Denver to Ottawa flights
Colorado Springs to Pearson Intl flights
Denver to Winnipeg flights
Denver to Victoria flights
Denver to Abbotsford flights
Colorado Springs to Vancouver Intl flights
Colorado Springs to Calgary flights
Vail to Vancouver Intl flights
Colorado Springs to Pierre Elliott Trudeau Intl flights
Denver to Hamilton flights
Denver to Yellowknife flights
Denver to Saskatoon flights
Denver to Charlottetown flights
Denver to St. John's flights
Aspen to Vancouver Intl flights
Denver to Terrace flights
Denver to Whitehorse flights
Grand Junction to Edmonton flights
Denver to Cranbrook flights
Colorado Springs to St. John's flights
Colorado Springs to Victoria flights
Colorado Springs to Ottawa flights
Montrose to Edmonton flights

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 27 January 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 215AverageC$ 504FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 249AverageC$ 547FlexibilityNo 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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