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Cheap flights from Denver to Ontario from C$ 146

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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
28 May — 4 Jun1
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 28 April 2026.

Mon 11/512:15 p.m.
DEN
-
YYZ
1 stop8h 30m
WestJet
Sun 17/510:25 p.m.
YYZ
-
DEN
1 stop14h 55m
WestJet
Deal found 23/4C$ 352
Tue 12/52:40 p.m.
DEN
-
YYZ
1 stop29h 15m
Multiple Airlines
Sat 23/55:20 p.m.
YYZ
-
DEN
2 stops20h 00m
Multiple Airlines
Deal found 23/4C$ 356
Tue 12/52:40 p.m.
DEN
-
YYZ
1 stop29h 15m
Multiple Airlines
Sun 17/510:25 p.m.
YYZ
-
DEN
1 stop14h 55m
Multiple Airlines
Deal found 23/4C$ 361
Mon 11/512:15 p.m.
DEN
-
YYZ
1 stop8h 30m
Multiple Airlines
Tue 19/57:00 a.m.
YYZ
-
DEN
2 stops19h 09m
Multiple Airlines
Deal found 27/4C$ 364
Wed 13/512:15 p.m.
DEN
-
YYZ
1 stop8h 30m
Multiple Airlines
Wed 20/56:15 a.m.
YYZ
-
DEN
2 stops19h 54m
Multiple Airlines
Deal found 23/4C$ 365
Fri 15/512:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Tue 19/510:25 p.m.
YYZ
-
DEN
1 stop14h 55m
WestJet
Deal found 27/4C$ 378
Mon 11/512:15 p.m.
DEN
-
YYZ
1 stop8h 30m
WestJet
Tue 19/510:25 p.m.
YYZ
-
DEN
1 stop14h 55m
WestJet
Deal found 27/4C$ 384
Tue 9/612:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Sun 14/66:30 p.m.
YYZ
-
DEN
1 stop18h 50m
WestJet
Deal found 23/4C$ 389
Sat 6/612:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Tue 9/610:25 p.m.
YYZ
-
DEN
1 stop14h 55m
WestJet
Deal found 27/4C$ 390
Fri 19/612:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Sun 21/610:25 p.m.
YYZ
-
DEN
1 stop14h 55m
WestJet
Deal found 26/4C$ 397
Sun 17/512:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Thu 21/58:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Deal found 26/4C$ 409
Sun 17/512:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Fri 22/57:15 a.m.
YUL
-
DEN
1 stop30h 05m
WestJet
Deal found 26/4C$ 428

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 28 April 2026.

Round-trip from

C$ 352

One-way from

C$ 146

Popular in

February

Cheapest in

September

Average price

C$ 818

Good round-trip deal

C$ 353 or less

Good one-way deal

C$ 380 or less
WestJet
  • WestJet
  • 11/5-18/5
  • 2 total stops
  • 23h 25m total
  • Denver to Ontario
Search Deals
WestJet
  • WestJet
  • 2/6
  • 1 total stop
  • 9h 55m total
  • Denver to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 92 potential increase over avg. RT price).
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 April 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 28 April 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

DenverLondon

DEN - YXU

DENYXU

Denver Intl

Fri 31/7

12:15 p.m.-4:45 p.m.

1 stop26h 30m

London

Sun 9/8

5:55 p.m.-11:20 a.m.

1 stop19h 25m

C$ 476

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Sun 17/5

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

1 stop27h 00m

Hamilton

Tue 26/5

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

1 stop19h 10m

C$ 536

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Mon 11/5

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

1 stop27h 00m

Hamilton

Sat 16/5

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

1 stop19h 10m

C$ 573

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Fri 15/5

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

1 stop27h 00m

Hamilton

Fri 22/5

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

1 stop19h 10m

C$ 577

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Fri 19/6

12:15 p.m.-12:30 p.m.

2 stops22h 15m

Ottawa

Sun 21/6

1:20 p.m.-11:20 a.m.

1 stop24h 00m

C$ 588

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Fri 19/6

12:15 p.m.-12:30 p.m.

2 stops22h 15m

Ottawa

Tue 23/6

6:15 p.m.-11:20 a.m.

2 stops19h 05m

C$ 594

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Thu 4/6

12:15 p.m.-7:50 p.m.

1 stop29h 35m

Toronto Region of Waterloo Intl

Sun 7/6

8:40 p.m.-11:20 a.m.

1 stop16h 40m

C$ 598

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Thu 25/6

12:15 p.m.-7:50 p.m.

1 stop29h 35m

Toronto Region of Waterloo Intl

Tue 30/6

8:40 p.m.-11:20 a.m.

1 stop16h 40m

C$ 613

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Thu 25/6

12:15 p.m.-7:50 p.m.

1 stop29h 35m

Toronto Region of Waterloo Intl

Mon 29/6

8:40 p.m.-11:20 a.m.

1 stop16h 40m

C$ 616

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Sat 25/7

12:15 p.m.-10:45 p.m.

1 stop8h 30m

Toronto Pearson Intl

Fri 31/7

12:55 p.m.-9:44 p.m.

1 stop10h 49m

C$ 627

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/4

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

How far ahead should I book a flight from Denver to Region of Ontario?

Booking 42 days in advance of your planned departure date is, on average, the best time to get cheap flights from Denver to Region of Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, May is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 147). Flying from Denver to Region of Ontario in April is currently the most expensive (average of C$ 322). 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 28 April 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 28 April 2026.

The most flights from DEN to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (2 on average).

How much does it cost to fly round-trip from Denver 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 28 April 2026.
Read through reviews of airlines operating flights from Denver to Ontario, such as Air Canada. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,975 reviews
Check prices

Crew

7.8

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Overall

7.1

Reviews

1 / 20
8.0
Excellent

John,Apr 2026

YVR - YOW

Crew was very attentive and meals were good. My wife required a wheel chair due to an accident on vacation. The service in Toronto was poor and Ottawa no better. Southeast Asia could teach them lots. Flight originated in Manila on ANA which was cancelled due to a mechanical issue. We were put up overnight in the Savoy Hotel with dinner and breakfast. The airline staff and hotel staff were fantastic.
Air Canada
7.1
Good
10,975 reviews
Air Canada
7.1
Good
10,975 reviews
Check prices

Crew

7.8

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Overall

7.1

Reviews

1 / 20
8.0
Excellent

John,Apr 2026

YVR - YOW

Crew was very attentive and meals were good. My wife required a wheel chair due to an accident on vacation. The service in Toronto was poor and Ottawa no better. Southeast Asia could teach them lots. Flight originated in Manila on ANA which was cancelled due to a mechanical issue. We were put up overnight in the Savoy Hotel with dinner and breakfast. The airline staff and hotel staff were fantastic.

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, Delta, and Air Canada can get you from Denver to Region of Ontario in just under 3h 13m. Your travel time can differ by up to 23h 17m. 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 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 United Airlines (75%), Air Canada (75%) or Austrian Airlines (61%) 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$ 891, our data indicates the cheapest price to be C$ 254. The most popular route (Denver Intl - Toronto Pearson Intl), is priced around C$ 406.

  • 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, May is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 147). Flying from Denver to Region of Ontario in April is currently the most expensive (average of C$ 322). 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 airline flying from Denver to Ontario

Discover the top airline 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 28 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 283AverageC$ 634FlexibilityNo 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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