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Cheap flights from Denver to Ontario from C$ 155

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 17/11. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Denver to Ontario

Keep the following information in mind while searching for Denver to Ontario flight deals. Data was last updated 11 September 2025.

Round-trip from

C$ 317

One-way from

C$ 155

Popular in

November

Cheapest in

March

Average price

C$ 633

Good round-trip deal

C$ 277 or less

Good one-way deal

C$ 299 or less
28/9-29/9
  • 28/9-29/9
  • 3 total stops
  • 24h 37m total
  • Denver to Ontario
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17/11
  • 17/11
  • 2 total stops
  • 11h 39m total
  • Denver to Ontario
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Highest demand for flights based on searches. 5% potential increase in price (C$ 51 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 15 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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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Find flight deals from Denver to Ontario

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 11 September 2025.

Sun 28/912:15 p.m.DEN - YYZ
1 stop8h 37mMultiple Airlines
Mon 29/92:00 p.m.YYZ - DEN
2 stops16h 00mMultiple Airlines
Deal found 9/9C$ 317
Wed 8/108:00 a.m.DEN - YYZ
2 stops12h 52mMultiple Airlines
Tue 14/107:15 a.m.YYZ - DEN
1 stop18h 01mMultiple Airlines
Deal found 9/9C$ 319
Thu 2/108:59 p.m.DEN - YYZ
1 stop22h 08mMultiple Airlines
Sun 5/108:00 p.m.YYZ - DEN
1 stop14h 09mMultiple Airlines
Deal found 9/9C$ 320
Fri 3/1012:15 p.m.DEN - YYZ
1 stop10h 07mMultiple Airlines
Sun 5/108:00 p.m.YYZ - DEN
1 stop14h 09mMultiple Airlines
Deal found 9/9C$ 321
Mon 29/912:15 p.m.DEN - YYZ
1 stop8h 37mMultiple Airlines
Wed 1/103:00 p.m.YYZ - DEN
2 stops15h 00mMultiple Airlines
Deal found 9/9C$ 324
Fri 3/1012:15 p.m.DEN - YYZ
1 stop10h 07mWestJet
Sat 4/1010:25 p.m.YYZ - DEN
1 stop14h 59mWestJet
Deal found 9/9C$ 327
Thu 2/108:59 p.m.DEN - YYZ
1 stop22h 08mMultiple Airlines
Tue 7/1011:00 a.m.YYZ - DEN
2 stops14h 10mMultiple Airlines
Deal found 9/9C$ 328
Sun 28/912:15 p.m.DEN - YYZ
1 stop8h 37mMultiple Airlines
Tue 30/99:30 a.m.YYZ - DEN
1 stop20h 30mMultiple Airlines
Deal found 9/9C$ 330
Tue 4/1112:10 p.m.DEN - YYZ
1 stop8h 50mMultiple Airlines
Fri 7/119:45 a.m.YYZ - DEN
1 stop16h 08mMultiple Airlines
Deal found 9/9C$ 334
Mon 13/1012:15 p.m.DEN - YYZ
1 stop16h 37mMultiple Airlines
Wed 15/102:00 p.m.YYZ - DEN
2 stops15h 59mMultiple Airlines
Deal found 9/9C$ 337
Tue 4/1112:10 p.m.DEN - YYZ
1 stop8h 50mMultiple Airlines
Mon 10/119:35 a.m.YYZ - DEN
1 stop16h 18mMultiple Airlines
Deal found 9/9C$ 338
Sat 8/118:41 p.m.DEN - YTZ
1 stop15h 01mMultiple Airlines
Mon 10/119:15 a.m.YTZ - DEN
1 stop7h 01mMultiple Airlines
Deal found 9/9C$ 405

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 11 September 2025.
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 - YYZ

DENYYZ

Denver Intl

Mon 29/9

12:15 p.m.-10:52 p.m.

1 stop8h 37m

Toronto Pearson Intl

Wed 1/10

3:00 p.m.-4:00 a.m.

2 stops15h 00m

C$ 324

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 17/10

8:21 p.m.-9:07 p.m.

1 stop22h 46m

Toronto Pearson Intl

Tue 21/10

9:30 a.m.-11:10 p.m.

1 stop15h 40m

C$ 358

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 30/10

12:16 a.m.-2:05 p.m.

1 stop11h 49m

Toronto Pearson Intl

Sun 2/11

4:00 p.m.-5:44 p.m.

1 stop27h 44m

C$ 380

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Wed 22/10

12:36 a.m.-10:40 p.m.

1 stop20h 04m

Toronto Pearson Intl

Mon 27/10

6:30 a.m.-3:59 a.m.

2 stops23h 29m

C$ 399

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Tue 21/10

8:22 p.m.-12:17 p.m.

1 stop13h 55m

Toronto Island

Thu 23/10

3:35 p.m.-8:08 p.m.

1 stop6h 33m

C$ 413

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 3/10

12:15 p.m.-10:52 p.m.

1 stop8h 37m

Toronto Pearson Intl

Sun 5/10

9:00 a.m.-11:24 a.m.

2 stops28h 24m

C$ 420

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 17/10

8:58 p.m.-12:17 p.m.

1 stop13h 19m

Toronto Island

Tue 21/10

1:35 p.m.-8:30 p.m.

1 stop8h 55m

C$ 430

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 16/10

9:12 p.m.-8:02 p.m.

1 stop20h 50m

Toronto Island

Tue 21/10

1:35 p.m.-8:30 p.m.

1 stop8h 55m

C$ 430

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 30/9

7:05 p.m.-8:23 a.m.

1 stop11h 18m

Ottawa

Thu 16/10

5:15 a.m.-10:04 a.m.

1 stop6h 49m

C$ 432

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Fri 24/10

8:40 a.m.-5:15 a.m.

2 stops18h 35m

Toronto Region of Waterloo Intl

Fri 31/10

7:05 a.m.-12:37 p.m.

2 stops31h 32m

C$ 432

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

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, January is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of C$ 168). Flying from Denver to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 11 September 2025.

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 11 September 2025.

The most flights from DEN to CAON are scheduled on a Monday (11 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (10 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 11 September 2025.
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
10,000 reviews
Check prices

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Crew

7.8

Overall

7.1

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.
Air Canada
7.1
Good
10,000 reviews
Air Canada
7.1
Good
10,000 reviews
Check prices

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Crew

7.8

Overall

7.1

Reviews

1 / 20
10.0
Excellent

janet,Sep 2025

YOW - YYZ

Really appreciated the leg room despite purchasing an economy ticket. Appreciated the extra complimentary wine. Nice touch. Was given immediate support without asking at check in, at the machine!! Ottawa's boarding was very organized with distinct rows in waiting room. Allowed for the main hall to not be blocked by people waiting to board.

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, Air Canada, and Delta can get you from Denver to Region of Ontario in just under 8h 37m. Your travel time can differ by up to 2h 41m. 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$ 172 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$ 184 and C$ 234, 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 (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$ 413, our data indicates the cheapest price to be C$ 231. The most popular route (Denver Intl - Toronto Pearson Intl), is priced around C$ 337.

  • 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$ 168). Flying from Denver to Region of Ontario in July is currently the most expensive (average of C$ 258). 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.
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Denver to Pearson Intl flights
Denver to Calgary flights
Denver to Pierre Elliott Trudeau Intl flights
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Colorado Springs to Vancouver Intl flights
Colorado Springs to Pearson Intl flights
Denver to Québec City flights
Denver to Kelowna flights
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Denver to Ottawa flights
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Denver to Hamilton flights
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Denver to St. John's flights
Colorado Springs to Ottawa flights
Denver to Yellowknife flights
Colorado Springs to St. John's flights
Denver to Whitehorse flights
Denver to Cranbrook flights

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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 171AverageC$ 754FlexibilityNo 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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