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Cheap flights from Denver to Ontario from C$ 175

DEN — YYZ
10 Oct — 17 Oct1
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

Mon 19/108:10 a.m. -
1 stop11h 45m
Sun 25/101:00 p.m. -
1 stop30h 21m
Deal found 8/9C$ 413
Sat 10/108:55 p.m. -
1 stop19h 05m
Mon 19/101:45 p.m. -
1 stop20h 34m
Deal found 9/9C$ 438
Thu 15/1012:15 p.m. -
1 stop8h 30m
Mon 19/104:45 p.m. -
1 stop26h 36m
Deal found 9/9C$ 449
Fri 23/108:30 a.m. -
1 stop29h 30m
Wed 28/101:10 p.m. -
1 stop30h 12m
Deal found 8/9C$ 456
Mon 19/108:10 a.m. -
1 stop11h 45m
Tue 27/101:40 p.m. -
1 stop10h 08m
Deal found 8/9C$ 461
Mon 19/108:10 a.m. -
1 stop11h 45m
Thu 22/101:30 p.m. -
2 stops32h 47m
Deal found 9/9C$ 470
Thu 15/108:55 p.m. -
1 stop15h 30m
Mon 19/1010:50 a.m. -
1 stop8h 31m
Deal found 9/9C$ 474
Sat 14/1110:39 a.m. -
1 stop29h 31m
Thu 19/119:35 a.m. -
2 stops16h 14m
Deal found 8/9C$ 478
Fri 2/1012:15 p.m. -
1 stop9h 55m
Wed 7/1010:55 p.m. -
2 stops14h 25m
Deal found 10/9C$ 484
Sat 24/101:07 p.m. -
2 stops14h 38m
Sun 1/111:00 p.m. -
1 stop30h 22m
Deal found 9/9C$ 486
Fri 2/1012:15 p.m. -
1 stop8h 30m
Mon 5/104:45 p.m. -
1 stop26h 31m
Deal found 9/9C$ 489
Mon 19/108:10 a.m. -
1 stop11h 45m
Wed 28/106:00 a.m. -
2 stops13h 42m
Deal found 8/9C$ 490

Find flight deals from Denver to Ontario

Round-trip from

C$ 413

One-way from

C$ 196

Popular in

February

Cheapest in

October

Average price

C$ 828

Good round-trip deal

C$ 260 or less

Good one-way deal

C$ 428 or less
19/10-25/10
  • 19/10-25/10
  • 2 total stops
  • 42h 06m total
  • Denver to Ontario
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WestJet
  • WestJet
  • 2/10-31/12
  • 1 total stop
  • 8h 30m total
  • Denver to Ontario
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 64 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Price to beat on a round-trip flight from Denver Intl to Ontario.
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Price to beat on a one-way flight from Denver Intl to Ontario.
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Cheapflights Fare Finder

 
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 Denver Intl - YTZ Toronto Island

DENYTZ

Denver Intl

Sat 31/10

10:39 a.m.-7:15 p.m.

1 stop30h 36m

Toronto Island

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 175

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Wed 21/10

10:40 a.m.-9:55 p.m.

2 stops33h 15m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 231

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Fri 25/9

12:15 p.m.-1:05 a.m.

1 stop10h 50m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 235

DenverToronto

DEN Denver Intl - YTZ Toronto Island

DENYTZ

Denver Intl

Thu 1/10

7:12 p.m.-4:00 p.m.

2 stops18h 48m

Toronto Island

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 235

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Fri 25/9

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

2 stops22h 15m

Ottawa

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 236

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Sat 31/10

10:40 a.m.-6:00 a.m.

3 stops17h 20m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 243

DenverToronto

DEN Denver Intl - YKF Toronto Region of Waterloo Intl

DENYKF

Denver Intl

Fri 25/9

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

1 stop29h 35m

Toronto Region of Waterloo Intl

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 245

DenverToronto

DEN Denver Intl - YKF Toronto Region of Waterloo Intl

DENYKF

Denver Intl

Thu 1/10

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

1 stop29h 35m

Toronto Region of Waterloo Intl

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 261

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Wed 21/10

1:07 p.m.-5:35 a.m.

2 stops14h 28m

Ottawa

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 264

DenverToronto

DEN Denver Intl - YKF Toronto Region of Waterloo Intl

DENYKF

Denver Intl

Sun 4/10

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

1 stop29h 35m

Toronto Region of Waterloo Intl

Wed 31/12

12:00 a.m.-10:00 p.m.

Nonstop0h 00m

C$ 264

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

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

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, November is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 765). Flying from Denver to Region of Ontario in February is currently the most expensive (average of C$ 948). 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?

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

The most flights from DEN to CAON are scheduled on a Monday (10 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (7 on average).

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

Airfare is typical for this route at the moment.
Denver to Region of Ontario flights typically cost between C$ 362 and C$ 934 in October.
The cheapest round-trip price found within the last 5 days was C$ 413 on Multiple Airlines (19 Oct-25 Oct).

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

Booking 63 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

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
11,608 reviews
Check prices

Food

6.3

Overall

7.1

Entertainment

6.8

Crew

7.8

Boarding

7.3

Comfort

7.1

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
11,608 reviews
Air Canada
7.1
Good
11,608 reviews
Check prices

Food

6.3

Overall

7.1

Entertainment

6.8

Crew

7.8

Boarding

7.3

Comfort

7.1

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

  • 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 49m. Your travel time can differ by up to 11h 31m. There are 2585 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$ 202 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Air Canada and United Airlines, with prices starting from C$ 302 and C$ 361, 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 Air Canada (65%), United Airlines (65%) or Brussels Airlines (63%) 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$ 645, our data indicates the cheapest price to be C$ 260. The most popular route (Denver Intl - Toronto Pearson Intl), is priced around C$ 470.

  • 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, November is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 765). Flying from Denver to Region of Ontario in February is currently the most expensive (average of C$ 948). 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

Top airline flying from Denver to Ontario

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 353AverageC$ 933FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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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?

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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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