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Cheap flights from Denver to Ontario from C$ 179

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 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
22 Aug — 29 Aug1
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 23 July 2026.

Tue 11/812:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Sat 15/88:00 a.m.
YYZ
-
DEN
1 stop29h 20m
WestJet
Deal found 22/7C$ 509
Mon 17/88:01 a.m.
DEN
-
YYZ
1 stop11h 54m
Multiple Airlines
Thu 20/86:00 a.m.
YYZ
-
DEN
2 stops15h 46m
Multiple Airlines
Deal found 22/7C$ 510
Tue 29/93:10 p.m.
DEN
-
YYZ
1 stop28h 45m
Multiple Airlines
Wed 7/106:00 a.m.
YYZ
-
DEN
2 stops14h 35m
Multiple Airlines
Deal found 22/7C$ 512
Thu 10/912:15 p.m.
DEN
-
YYZ
1 stop8h 30m
Multiple Airlines
Tue 15/96:00 a.m.
YYZ
-
DEN
2 stops17h 30m
Multiple Airlines
Deal found 23/7C$ 519
Tue 1/912:15 p.m.
DEN
-
YYZ
1 stop8h 30m
Multiple Airlines
Tue 8/98:35 p.m.
YYZ
-
DEN
1 stop9h 17m
Multiple Airlines
Deal found 22/7C$ 520
Wed 2/912:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Wed 9/98:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Deal found 19/7C$ 524
Thu 3/96:45 a.m.
DEN
-
YYZ
1 stop10h 34m
Multiple Airlines
Mon 7/94:45 p.m.
YYZ
-
DEN
1 stop24h 16m
Multiple Airlines
Deal found 22/7C$ 524
Wed 12/812:15 p.m.
DEN
-
YYZ
1 stop9h 55m
WestJet
Wed 19/82:25 p.m.
YYZ
-
DEN
2 stops22h 55m
WestJet
Deal found 22/7C$ 528
Mon 17/812:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Sat 22/88:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Deal found 19/7C$ 531
Tue 4/87:56 a.m.
DEN
-
YTZ
1 stop6h 04m
Multiple Airlines
Tue 11/810:50 a.m.
YTZ
-
DEN
1 stop29h 41m
Multiple Airlines
Deal found 18/7C$ 533
Wed 26/812:15 p.m.
DEN
-
YUL
1 stop9h 30m
WestJet
Thu 27/88:00 p.m.
YUL
-
DEN
1 stop17h 20m
WestJet
Deal found 18/7C$ 533
Fri 25/912:15 p.m.
DEN
-
YYZ
2 stops14h 55m
WestJet
Sun 27/95:20 p.m.
YYZ
-
DEN
2 stops20h 00m
WestJet
Deal found 22/7C$ 533

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 23 July 2026.

Round-trip from

C$ 509

One-way from

C$ 179

Popular in

February

Cheapest in

October

Average price

C$ 875

Good one-way deal

C$ 297 or less
WestJet
  • WestJet
  • 11/8-15/8
  • 2 total stops
  • 39h 15m total
  • Denver to Ontario
Search Deals
26/8
  • 26/8
  • 1 total stop
  • 11h 24m total
  • Denver to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (C$ 116 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 23 July 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

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 14/8

10:29 p.m.-12:55 p.m.

2 stops12h 26m

Toronto Island

Mon 17/8

10:50 a.m.-3:01 p.m.

1 stop30h 11m

C$ 571

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Tue 4/8

7:56 a.m.-4:00 p.m.

1 stop6h 04m

Toronto Island

Sat 8/8

1:40 p.m.-10:05 p.m.

2 stops34h 25m

C$ 590

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 18/9

6:55 a.m.-4:00 p.m.

1 stop7h 05m

Toronto Island

Wed 23/9

10:50 a.m.-9:49 p.m.

1 stop12h 59m

C$ 592

DenverLondon

DEN - YXU

DENYXU

Denver Intl

Thu 13/8

12:15 p.m.-5:20 a.m.

1 stop15h 05m

London

Mon 17/8

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

1 stop19h 25m

C$ 598

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Wed 21/10

6:25 a.m.-6:00 p.m.

1 stop9h 35m

Toronto Island

Sat 24/10

10:50 a.m.-9:49 p.m.

1 stop12h 59m

C$ 606

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Sat 5/9

12:15 p.m.-5:35 a.m.

1 stop15h 20m

Ottawa

Sun 13/9

2:00 p.m.-11:20 a.m.

2 stops23h 20m

C$ 609

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Thu 27/8

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

1 stop29h 35m

Toronto Region of Waterloo Intl

Mon 31/8

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

1 stop16h 40m

C$ 662

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 5/11

6:55 a.m.-6:15 p.m.

1 stop9h 20m

Toronto Island

Mon 9/11

10:10 a.m.-9:41 p.m.

2 stops13h 31m

C$ 662

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Wed 19/8

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

1 stop29h 35m

Toronto Region of Waterloo Intl

Wed 26/8

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

1 stop16h 40m

C$ 682

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Fri 25/9

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

2 stops22h 15m

Ottawa

Sat 3/10

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

2 stops19h 05m

C$ 698

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/7

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, October is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 706). Flying from Denver to Region of Ontario in February is currently the most expensive (average of C$ 967). 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 23 July 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 23 July 2026.

The most flights from DEN to CAON are scheduled on a Monday (10 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Denver to Region of Ontario?

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

Booking 66 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.

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 23 July 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
11,371 reviews
Check prices

Entertainment

6.8

Overall

7.1

Boarding

7.3

Comfort

7.1

Crew

7.8

Food

6.3

Reviews

1 / 20
2.0
Mediocre

Shawna,Sep 2025

DCA - YYZ

Business class cabin was *freezing*. Landing was so hard it injured my back - no apology or explanation given
Air Canada
7.1
Good
11,371 reviews
Air Canada
7.1
Good
11,371 reviews
Check prices

Entertainment

6.8

Overall

7.1

Boarding

7.3

Comfort

7.1

Crew

7.8

Food

6.3

Reviews

1 / 20
2.0
Mediocre

Shawna,Sep 2025

DCA - YYZ

Business class cabin was *freezing*. Landing was so hard it injured my back - no apology or explanation given

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 United Airlines can get you from Denver to Region of Ontario in just under 3h 12m. Your travel time can differ by up to 11h 53m. 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$ 206 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$ 234 and C$ 243, 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 United Airlines (74%), Brussels Airlines (71%) or Air Canada (68%) 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$ 440, our data indicates the cheapest price to be C$ 297. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around C$ 660.

  • 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, October is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 706). Flying from Denver to Region of Ontario in February is currently the most expensive (average of C$ 967). 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 23 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 293AverageC$ 862FlexibilityNo 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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