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Cheap flights from Denver to Ontario from C$ 165

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
3 Aug — 10 Aug1
1 adult

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 29 July 2025.

Round-trip from

C$ 361

One-way from

C$ 165

Popular in

November

Cheapest in

March

Average price

C$ 716

Good round-trip deal

C$ 543 or less

Good one-way deal

C$ 248 or less
26/9-30/9
  • 26/9-30/9
  • 3 total stops
  • 28h 07m total
  • Denver to Ontario
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9/9
  • 9/9
  • 2 total stops
  • 26h 25m total
  • Denver to Ontario
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Highest demand for flights based on searches. 7% potential increase in price (C$ 71 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
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Average for round-trip flights in July 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 29 July 2025.

Fri 26/912:15 p.m.DEN - YYZ
1 stop10h 07mMultiple Airlines
Tue 30/912:00 p.m.YYZ - DEN
2 stops18h 00mMultiple Airlines
Deal found 27/7C$ 361
Thu 11/912:15 p.m.DEN - YYZ
1 stop8h 37mWestJet
Mon 15/910:25 p.m.YYZ - DEN
1 stop14h 59mWestJet
Deal found 27/7C$ 377
Fri 12/912:28 p.m.DEN - YTZ
1 stop5h 34mMultiple Airlines
Mon 15/97:50 a.m.YTZ - DEN
1 stop12h 36mMultiple Airlines
Deal found 27/7C$ 392
Wed 3/912:15 p.m.DEN - YUL
1 stop24h 00mMultiple Airlines
Tue 9/91:10 p.m.YUL - DEN
2 stops22h 03mMultiple Airlines
Deal found 27/7C$ 414
Tue 9/911:25 a.m.DEN - YYZ
Nonstop3h 10mAir Canada
Fri 12/911:15 a.m.YYZ - DEN
1 stop10h 08mAir Canada
Deal found 27/7C$ 427
Mon 18/89:40 a.m.DEN - YTZ
1 stop8h 06mAir Canada
Sun 24/812:25 p.m.YTZ - DEN
1 stop7h 55mAir Canada
Deal found 28/7C$ 436
Wed 3/912:15 p.m.DEN - YUL
1 stop10h 26mWestJet
Sun 7/97:00 a.m.YUL - DEN
1 stop13h 48mWestJet
Deal found 27/7C$ 458
Tue 9/912:15 p.m.DEN - YHM
1 stop10h 25mMultiple Airlines
Sat 13/97:15 p.m.YHM - DEN
1 stop18h 09mMultiple Airlines
Deal found 27/7C$ 468
Sun 17/89:40 a.m.DEN - YUL
Nonstop3h 46mAir Canada
Sat 23/88:05 a.m.YUL - DEN
Nonstop4h 16mAir Canada
Deal found 27/7C$ 477
Thu 4/912:15 p.m.DEN - YKF
1 stop10h 30mMultiple Airlines
Sun 7/96:00 a.m.YKF - DEN
1 stop14h 48mMultiple Airlines
Deal found 29/7C$ 488
Sat 30/812:15 p.m.DEN - YOW
1 stop10h 26mWestJet
Wed 3/97:15 p.m.YOW - DEN
1 stop18h 09mWestJet
Deal found 26/7C$ 491
Wed 10/97:45 a.m.DEN - YXU
1 stop5h 32mAir Canada
Wed 17/93:50 p.m.YXU - DEN
1 stop6h 04mAir Canada
Deal found 27/7C$ 503

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 29 July 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

Fri 26/9

12:15 p.m.-12:22 a.m.

1 stop10h 07m

Toronto Pearson Intl

Tue 30/9

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

2 stops18h 00m

C$ 361

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 11/9

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

1 stop8h 37m

Toronto Pearson Intl

Mon 15/9

10:25 p.m.-11:24 a.m.

1 stop14h 59m

C$ 377

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 12/9

12:28 p.m.-8:02 p.m.

1 stop5h 34m

Toronto Island

Mon 15/9

7:50 a.m.-6:26 p.m.

1 stop12h 36m

C$ 392

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Wed 3/9

12:15 p.m.-2:15 p.m.

1 stop24h 00m

Montreal Pierre Elliott Trudeau Intl

Tue 9/9

1:10 p.m.-9:13 a.m.

2 stops22h 03m

C$ 414

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 9/9

11:25 a.m.-4:35 p.m.

Nonstop3h 10m

Toronto Pearson Intl

Fri 12/9

11:15 a.m.-7:23 p.m.

1 stop10h 08m

C$ 427

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Mon 18/8

9:40 a.m.-7:46 p.m.

1 stop8h 06m

Toronto Island

Sun 24/8

12:25 p.m.-6:20 p.m.

1 stop7h 55m

C$ 436

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Wed 3/9

12:15 p.m.-12:41 a.m.

1 stop10h 26m

Montreal Pierre Elliott Trudeau Intl

Sun 7/9

7:00 a.m.-6:48 p.m.

1 stop13h 48m

C$ 458

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Tue 9/9

12:15 p.m.-12:40 a.m.

1 stop10h 25m

Hamilton

Sat 13/9

7:15 p.m.-11:24 a.m.

1 stop18h 09m

C$ 468

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Sun 17/8

9:40 a.m.-3:26 p.m.

Nonstop3h 46m

Montreal Pierre Elliott Trudeau Intl

Sat 23/8

8:05 a.m.-10:21 a.m.

Nonstop4h 16m

C$ 477

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Thu 4/9

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

1 stop10h 30m

Toronto Region of Waterloo Intl

Sun 7/9

6:00 a.m.-6:48 p.m.

1 stop14h 48m

C$ 488

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Showing 1-10 of 47 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$ 167). 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 29 July 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 29 July 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 (7 on average).

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 29 July 2025.
Read through reviews of airlines operating flights from Denver to Ontario, such as Alaska Airlines,Delta, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,977 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,899 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
WestJet
7.2
Good
2,973 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight 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.

  • What are the cheapest airlines to fly from Denver to Region of Ontario one-way?

    C$ 180 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 Delta, with prices starting from C$ 224 and C$ 241, 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 (72%), Air Canada (68%) or United Airlines (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$ 456, our data indicates the cheapest price to be C$ 192. The most popular route (Denver Intl - Toronto Pearson Intl), is priced around C$ 361.

  • 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$ 167). 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
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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 29 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 169AverageC$ 792FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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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