Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Denver to Ontario from C$ 172

DEN — YYZ
25 Nov — 2 Dec1
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

Tue 8/1210:18 a.m. -
2 stops34h 37m
Sat 12/1211:30 a.m. -
1 stop14h 38m
Deal found 22/10C$ 462
Sat 12/122:26 p.m. -
1 stop29h 25m
Tue 15/121:40 p.m. -
1 stop8h 20m
Deal found 24/10C$ 468
Tue 1/127:30 a.m. -
2 stops37h 25m
Fri 4/121:40 p.m. -
1 stop8h 37m
Deal found 23/10C$ 472
Wed 25/1110:50 p.m. -
1 stop30h 01m
Tue 1/121:40 p.m. -
1 stop8h 45m
Deal found 25/10C$ 476
Thu 3/127:46 a.m. -
1 stop11h 56m
Mon 7/129:35 a.m. -
2 stops32h 08m
Deal found 22/10C$ 479
Tue 8/1210:18 a.m. -
2 stops10h 26m
Fri 11/121:40 p.m. -
1 stop8h 20m
Deal found 22/10C$ 480
Tue 8/1210:18 a.m. -
2 stops10h 26m
Sun 13/121:40 p.m. -
1 stop8h 20m
Deal found 22/10C$ 482
Wed 16/127:25 a.m. -
1 stop10h 14m
Tue 12/110:40 a.m. -
2 stops23h 23m
Deal found 25/10C$ 487
Wed 9/127:25 a.m. -
1 stop10h 14m
Wed 16/129:05 a.m. -
2 stops16h 42m
Deal found 25/10C$ 496
Wed 23/127:39 a.m. -
1 stop31h 15m
Tue 12/110:40 a.m. -
2 stops23h 23m
Deal found 24/10C$ 507
Wed 25/1111:59 p.m. -
1 stop14h 46m
Wed 2/128:30 a.m. -
2 stops17h 19m
Deal found 25/10C$ 598
Wed 9/129:00 a.m. -
2 stops27h 32m
Wed 16/128:00 a.m. -
1 stop9h 40m
Deal found 25/10C$ 599

Find flight deals from Denver to Ontario

Round-trip from

C$ 433

One-way from

C$ 172

Popular in

August

Cheapest in

February

Average price

C$ 839

Good one-way deal

C$ 397 or less
13/1-19/1
  • 13/1-19/1
  • 3 total stops
  • 28h 07m total
  • Denver to Ontario
Search Deals
12/1-31/12
  • 12/1-31/12
  • 2 total stops
  • 29h 06m total
  • Denver to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2026
Search Deals
Price to beat on a one-way flight from Denver Intl to Ontario.
Search Deals

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 - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Mon 25/1

9:15 p.m.-5:40 p.m.

2 stops42h 25m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 207

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Tue 1/12

10:18 a.m.-10:55 p.m.

2 stops34h 37m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 210

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Wed 6/1

8:10 p.m.-10:42 p.m.

2 stops24h 32m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 221

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Thu 26/11

9:21 a.m.-6:51 a.m.

2 stops19h 30m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 223

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Tue 24/11

8:11 a.m.-11:59 p.m.

1 stop13h 48m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 265

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Thu 24/12

10:05 p.m.-6:52 a.m.

2 stops30h 47m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 279

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Tue 24/11

7:50 p.m.-9:51 p.m.

1 stop24h 01m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 280

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Tue 24/11

8:33 p.m.-1:30 p.m.

2 stops14h 57m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 319

DenverOttawa

DEN Denver Intl - YOW Ottawa

DENYOW

Denver Intl

Sun 20/12

9:23 p.m.-5:56 p.m.

3 stops42h 33m

Ottawa

Wed 31/12

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

Nonstop0h 00m

C$ 364

DenverToronto

DEN Denver Intl - YYZ Toronto Pearson Intl

DENYYZ

Denver Intl

Tue 24/11

8:15 a.m.-11:40 p.m.

2 stops13h 25m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 377

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/10

Showing 1-10 of 28 resultsSorted by cheapest first
1
2
3

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, January is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 829). Flying from Denver to Region of Ontario in February is currently the most expensive (average of C$ 961). 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.

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

Airfare is below average for this route at the moment.
Denver to Region of Ontario flights typically cost between C$ 679 and C$ 1,071 in January.
The cheapest round-trip price found within the last 5 days was C$ 433 on Multiple Airlines (13 Jan-19 Jan).

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

Booking 20 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
11,815 reviews
Check prices

Boarding

7.3

Comfort

7.1

Overall

7.1

Crew

7.8

Entertainment

6.8

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
11,815 reviews
Air Canada
7.1
Good
11,815 reviews
Check prices

Boarding

7.3

Comfort

7.1

Overall

7.1

Crew

7.8

Entertainment

6.8

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

  • 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?

    United Airlines can get you from Denver to Region of Ontario in just under 3h 12m. Your travel time will be generally consistent. There are 2111 km between Denver and Region of Ontario. Most flights are nonstop.

  • 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 (76%), Air Canada (75%) or Austrian Airlines (74%) 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$ 416, our data indicates the cheapest price to be C$ 397. The most popular route (Denver Intl - Toronto Pearson Intl), is priced around C$ 433.

  • 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, January is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 829). Flying from Denver to Region of Ontario in February is currently the most expensive (average of C$ 961). 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$ 362AverageC$ 946FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.