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$110+ Cheap flights from Denver (DEN) to Ontario

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 6/13. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Apr 5 — Apr 121
Sat 4/5
Sat 4/12
1 adult, Economy
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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 March 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$244
(Trip.com)

One-way from

$110
(Kiwi.com)

Popular in

November

Cheapest in

May

Average price

$292

Good round-trip deal

$631 or less

Good one-way deal

$323 or less
Provider with most accurate pricing for Denver Intl-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Toronto (YTO) flights.
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From Denver Intl to Ontario
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One-way flight from Denver Intl to Ontario
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Highest demand for flights based on searches. 13% potential increase in price ($76 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 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 March 31, 2025.

This Trip.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/297:40 pmDEN - YYZ
1 stop8h 32mWestJet
Sun 8/3110:00 amYYZ - DEN
1 stop10h 52mWestJet
Deal found 3/30$244
This Mytrip deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1712:15 pmDEN - YUL
1 stop10h 28mWestJet
Thu 5/226:45 amYUL - DEN
2 stops14h 07mWestJet
Deal found 3/29$268
This Kiwi.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/212:15 pmDEN - YYZ
1 stop8h 39mMultiple Airlines
Tue 5/61:30 pmYYZ - DEN
2 stops22h 27mMultiple Airlines
Deal found 3/30$269
This Trip.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/812:15 pmDEN - YOW
1 stop10h 26mWestJet
Sun 5/186:10 amYOW - DEN
2 stops31h 17mWestJet
Deal found 3/30$271
This Trip.com deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/112:15 pmDEN - YKF
1 stop10h 31mWestJet
Fri 8/156:00 amYKF - DEN
1 stop14h 52mWestJet
Deal found 3/31$273
This Mytrip deal was found by Cheapflights users on 3/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1612:15 pmDEN - YKF
1 stop15h 00mMultiple Airlines
Fri 5/236:00 amYKF - DEN
1 stop14h 52mMultiple Airlines
Deal found 3/31$284
This Trip.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1012:15 pmDEN - YHM
1 stop10h 26mWestJet
Sun 7/136:00 amYHM - DEN
1 stop14h 52mWestJet
Deal found 3/30$301
This Kiwi.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/812:15 pmDEN - YOW
1 stop10h 26mMultiple Airlines
Tue 5/133:35 pmYOW - DEN
2 stops20h 22mMultiple Airlines
Deal found 3/30$302
This Kiwi.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2910:52 pmDEN - YTZ
2 stops18h 01mMultiple Airlines
Mon 5/57:55 amYTZ - DEN
1 stop13h 28mMultiple Airlines
Deal found 3/30$304
This Kiwi.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1712:15 pmDEN - YUL
1 stop10h 28mMultiple Airlines
Mon 5/196:45 amYUL - DEN
2 stops29h 12mMultiple Airlines
Deal found 3/30$311
This oojo deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1312:15 pmDEN - YXU
1 stop14h 59mWestJet
Tue 8/198:00 pmYXU - DEN
1 stop17h 27mWestJet
Deal found 3/30$316
This Kiwi.com deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1412:15 pmDEN - YHM
1 stop10h 26mMultiple Airlines
Wed 5/216:00 amYHM - DEN
2 stops24h 00mMultiple Airlines
Deal found 3/30$345

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 2,558,603 searches. Data last updated March 31, 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 8/29

7:40 pm-6:12 am

1 stop8h 32m

Toronto Pearson Intl

Sun 8/31

10:00 am-6:52 pm

1 stop10h 52m

$244

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Sat 5/17

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Thu 5/22

6:45 am-6:52 pm

2 stops14h 07m

$268

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 5/2

12:15 pm-10:54 pm

1 stop8h 39m

Toronto Pearson Intl

Tue 5/6

1:30 pm-9:57 am

2 stops22h 27m

$269

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 5/8

12:15 pm-12:41 am

1 stop10h 26m

Ottawa

Sun 5/18

6:10 am-11:27 am

2 stops31h 17m

$271

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Sun 6/1

12:15 pm-12:46 am

1 stop10h 31m

Toronto Region of Waterloo Intl

Fri 8/15

6:00 am-6:52 pm

1 stop14h 52m

$273

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Fri 5/16

12:15 pm-5:15 am

1 stop15h 00m

Toronto Region of Waterloo Intl

Fri 5/23

6:00 am-6:52 pm

1 stop14h 52m

$284

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Thu 7/10

12:15 pm-12:41 am

1 stop10h 26m

Hamilton

Sun 7/13

6:00 am-6:52 pm

1 stop14h 52m

$301

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Thu 5/8

12:15 pm-12:41 am

1 stop10h 26m

Ottawa

Sat 5/17

6:00 am-9:52 am

2 stops29h 52m

$302

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Tue 4/29

10:52 pm-6:53 pm

2 stops18h 01m

Toronto Island

Mon 5/5

7:55 am-7:23 pm

1 stop13h 28m

$304

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Sat 5/17

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Mon 5/19

6:45 am-9:57 am

2 stops29h 12m

$311

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 50 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 $243). Flying from Denver to Region of Ontario in July is currently the most expensive (average of $359). 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 March 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Denver to Region of Ontario as you normally would.

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 March 31, 2025.

The most flights from DEN to CAON are scheduled on a Tuesday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (9 on average).

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 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 March 31, 2025.
To help decide which airline to fly from Denver to Ontario, see what other customers have to say about Alaska Airlines, Delta and Aeromexico. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,811 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
9,811 reviews
Alaska Airlines
8.0
Very good
9,811 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
7,899 reviews
Alaska Airlines
8.0
Very good
9,811 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
Aeromexico
7.5
Good
1,700 reviews
Alaska Airlines
8.0
Very good
9,811 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
8,614 reviews
Alaska Airlines
8.0
Very good
9,811 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
9,811 reviews

Crew

8.5

Comfort

7.9

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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?

    If you book a flight to Ontario from Denver, you will be flying from Denver Intl, which is the city’s only airport. Denver Intl (DEN) is located 18.5 mi from the center of Denver.

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

    $110 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 $199 and $207, 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?

    The top 3 most reliable airlines when flying from Denver to Region of Ontario are Austrian Airlines (81%), Air Canada (65%) and United Airlines (65%).

  • 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 $2,023, our data indicates the cheapest price to be $184. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around $301.

  • 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 $243). Flying from Denver to Region of Ontario in July is currently the most expensive (average of $359). 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 Pearson Intl flights
Denver to Calgary flights
Denver to Abbotsford flights
Denver to Edmonton flights
Denver to Toronto Island flights
Denver to Victoria flights
Denver to Winnipeg flights
Denver to Region of Waterloo Intl flights
Denver to Québec City flights
Denver to Ottawa flights
Denver to Halifax flights
Denver to Hamilton flights
Colorado Springs to Vancouver Intl flights
Denver to Saskatoon flights
Denver to Kelowna flights
Denver to St. John's flights
Denver to Charlottetown flights
Colorado Springs to Pierre Elliott Trudeau Intl flights
Grand Junction to Vancouver Intl flights
Denver to Regina flights
Colorado Springs to Calgary flights
Montrose to Vancouver Intl flights
Denver to Yellowknife flights
Denver to Sydney flights
Denver to London flights
Denver to Fredericton flights
Durango to Calgary flights
Denver to Moncton flights
Colorado Springs to Edmonton flights
Hayden to Calgary flights
Colorado Springs to Pearson Intl flights
Grand Junction to Thunder Bay flights
Durango to Pearson Intl flights
Denver to Whitehorse flights
Denver to Terrace flights
Grand Junction to Calgary flights
Colorado Springs to Québec City flights
Aspen to Halifax flights
Vail to Pearson Intl flights
Grand Junction to Edmonton flights
Montrose to Calgary flights
Vail to Vancouver Intl flights
Denver to Smithers flights
Denver to Cranbrook flights
Denver to Kingston flights
Denver to Campbell River flights

Top 2 airlines flying from Denver to Ontario

Discover the top 2 airlines 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 2,558,603 searches. Data last updated March 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$221Average$528FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$289Average$544FlexibilityNo cancel feeOn-time69%
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