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Cheap flights from Denver to Ontario from C$ 157

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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
2 Apr — 9 Apr1
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 28 March 2025.

Round-trip from

C$ 349

One-way from

C$ 157

Popular in

August

Cheapest in

March

Average price

C$ 417

Good round-trip deal

C$ 837 or less

Good one-way deal

C$ 355 or less
WestJet
  • WestJet
  • 11/7-17/7
  • 2 total stops
  • 19h 24m total
  • Denver to Ontario
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WestJet
  • WestJet
  • 10/7
  • 1 total stop
  • 8h 32m total
  • Denver to Ontario
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Highest demand for flights based on searches. 8% potential increase in price (C$ 92 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 22 potential savings vs. average RT price).
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Average for round-trip flights in March 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 28 March 2025.

Mon 28/712:15 p.m.DEN - YYZ
1 stop8h 39mWestJet
Thu 7/810:00 a.m.YYZ - DEN
1 stop10h 52mWestJet
Deal found 27/3C$ 349
Tue 3/612:15 p.m.DEN - YUL
1 stop10h 28mWestJet
Thu 26/66:45 a.m.YUL - DEN
2 stops14h 07mWestJet
Deal found 27/3C$ 383
Thu 24/712:15 p.m.DEN - YOW
1 stop10h 26mWestJet
Sun 10/86:00 a.m.YOW - DEN
1 stop14h 52mWestJet
Deal found 27/3C$ 384
Sat 23/812:15 p.m.DEN - YKF
1 stop10h 31mWestJet
Tue 26/87:45 p.m.YKF - DEN
1 stop17h 42mWestJet
Deal found 27/3C$ 390
Wed 14/512:15 p.m.DEN - YYZ
1 stop8h 39mMultiple Airlines
Sat 17/51:30 p.m.YYZ - DEN
2 stops22h 22mMultiple Airlines
Deal found 27/3C$ 402
Sun 11/512:15 p.m.DEN - YUL
1 stop10h 28mMultiple Airlines
Sun 18/57:00 a.m.YUL - DEN
2 stops28h 57mMultiple Airlines
Deal found 26/3C$ 436
Thu 22/57:40 p.m.DEN - YHM
1 stop27h 01mWestJet
Sun 25/56:00 a.m.YHM - DEN
1 stop14h 52mWestJet
Deal found 26/3C$ 457
Thu 22/57:40 p.m.DEN - YKF
2 stops31h 50mMultiple Airlines
Sun 25/56:00 a.m.YKF - DEN
1 stop14h 52mMultiple Airlines
Deal found 26/3C$ 459
Sun 8/67:40 p.m.DEN - YHM
1 stop27h 01mMultiple Airlines
Thu 12/67:15 p.m.YHM - DEN
1 stop25h 37mMultiple Airlines
Deal found 27/3C$ 477
Thu 25/910:11 a.m.DEN - YUL
1 stop24h 27mSun Country Air
Sun 28/99:45 a.m.YUL - DEN
1 stop7h 49mSun Country Air
Deal found 27/3C$ 490
Thu 22/57:40 p.m.DEN - YTZ
2 stops18h 47mMultiple Airlines
Sun 25/53:35 p.m.YTZ - DEN
2 stops21h 52mMultiple Airlines
Deal found 26/3C$ 500
Thu 15/512:15 p.m.DEN - YOW
3 stops30h 48mMultiple Airlines
Mon 19/56:10 a.m.YOW - DEN
2 stops31h 17mMultiple Airlines
Deal found 27/3C$ 526

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 28 March 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 11/7

7:40 p.m.-6:12 a.m.

1 stop8h 32m

Toronto Pearson Intl

Thu 17/7

10:00 a.m.-6:52 p.m.

1 stop10h 52m

C$ 349

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 3/6

12:15 p.m.-12:43 a.m.

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Thu 26/6

6:45 a.m.-6:52 p.m.

2 stops14h 07m

C$ 383

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 24/7

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

1 stop10h 26m

Ottawa

Sun 10/8

6:00 a.m.-6:52 p.m.

1 stop14h 52m

C$ 384

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Sat 23/8

12:15 p.m.-12:46 a.m.

1 stop10h 31m

Toronto Region of Waterloo Intl

Tue 26/8

7:45 p.m.-11:27 a.m.

1 stop17h 42m

C$ 390

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Wed 14/5

12:15 p.m.-10:54 p.m.

1 stop8h 39m

Toronto Pearson Intl

Sat 17/5

1:30 p.m.-9:52 a.m.

2 stops22h 22m

C$ 402

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 13/5

12:15 p.m.-12:43 a.m.

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Fri 16/5

7:00 a.m.-9:57 a.m.

2 stops28h 57m

C$ 422

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Thu 22/5

7:40 p.m.-12:41 a.m.

1 stop27h 01m

Hamilton

Sun 25/5

6:00 a.m.-6:52 p.m.

1 stop14h 52m

C$ 457

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Thu 22/5

7:40 p.m.-5:30 a.m.

2 stops31h 50m

Toronto Region of Waterloo Intl

Sun 25/5

6:00 a.m.-6:52 p.m.

1 stop14h 52m

C$ 459

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Sun 8/6

7:40 p.m.-12:41 a.m.

1 stop27h 01m

Hamilton

Thu 12/6

7:15 p.m.-6:52 p.m.

1 stop25h 37m

C$ 477

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 22/5

7:40 p.m.-4:27 p.m.

2 stops18h 47m

Toronto Island

Sun 25/5

3:35 p.m.-11:27 a.m.

2 stops21h 52m

C$ 500

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/3

Showing 1-10 of 46 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 28 March 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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 28 March 2025.
Read through reviews of airlines operating flights from Denver to Ontario, such as Alaska Airlines, Delta and United 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
9,798 reviews
Check prices

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,798 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,896 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,603 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
WestJet
7.2
Good
2,788 reviews
Alaska Airlines
8.0
Very good
9,798 reviews
Check prices

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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$ 157 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Delta and Air Canada, with prices starting from C$ 296 and C$ 320, 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 Austrian Airlines (81%), Air Canada (65%) or United Airlines (65%) 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$ 821, our data indicates the cheapest price to be C$ 166. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around C$ 422.

  • 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.
Denver to Vancouver Intl flights
Denver to Pierre Elliott Trudeau Intl flights
Denver to Calgary flights
Denver to Pearson Intl flights
Denver to Abbotsford flights
Denver to Edmonton flights
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Denver to Québec City flights
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Montrose to Edmonton flights
Denver to Terrace flights
Denver to Cranbrook flights
Colorado Springs to St. John's flights
Colorado Springs to Victoria flights
Colorado Springs to Ottawa flights
Aspen to Vancouver Intl 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 28 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 223AverageC$ 847FlexibilityNo 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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