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$83+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$230
(Kiwi.com)

One-way from

$83
(Trip.com)

Popular in

November

Cheapest in

March

Average price

$370

Good round-trip deal

$549 or less

Good one-way deal

$307 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. 6% potential increase in price ($35 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 May 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 May 1, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/30. 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 6/67:40 pmDEN - YYZ
1 stop8h 32mWestJet
Sun 6/811:00 amYYZ - DEN
1 stop9h 52mWestJet
Deal found 4/30$239
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/912:15 pmDEN - YUL
1 stop10h 28mWestJet
Wed 7/235:30 pmYUL - DEN
1 stop19h 57mWestJet
Deal found 4/29$268
This oojo deal was found by Cheapflights users on 4/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1712:15 pmDEN - YKF
1 stop10h 31mWestJet
Fri 5/236:00 amYKF - DEN
1 stop14h 52mWestJet
Deal found 4/29$285
This oojo deal was found by Cheapflights users on 4/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1712:15 pmDEN - YHM
1 stop10h 26mWestJet
Fri 5/236:00 amYHM - DEN
1 stop14h 52mWestJet
Deal found 4/29$303
This Justfly.com deal was found by Cheapflights users on 4/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3112:15 pmDEN - YXU
1 stop14h 59mWestJet
Sat 6/78:00 pmYXU - DEN
1 stop17h 27mWestJet
Deal found 4/30$304
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 6/2712:15 pmDEN - YYZ
1 stop8h 39mMultiple Airlines
Tue 7/112:00 pmYYZ - DEN
2 stops18h 01mMultiple Airlines
Deal found 4/30$316
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 7/28:21 pmDEN - YTZ
1 stop13h 59mMultiple Airlines
Sat 7/57:55 amYTZ - DEN
1 stop10h 38mMultiple Airlines
Deal found 4/30$318
This Booking.com deal was found by Cheapflights users on 4/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/185:55 pmDEN - YYZ
1 stop15h 43mSun Country Air
Sun 9/217:30 amYYZ - DEN
1 stop10h 13mSun Country Air
Deal found 4/29$339
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/158:25 amDEN - YUL
2 stops14h 12mMultiple Airlines
Tue 8/195:30 pmYUL - DEN
1 stop19h 57mMultiple Airlines
Deal found 4/29$349
This Sun Country Air deal was found by Cheapflights users on 4/29. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/116:07 pmDEN - YUL
1 stop16h 23mSun Country Air
Sun 6/158:15 amYUL - DEN
1 stop27h 04mSun Country Air
Deal found 4/29$364
This Justfly.com deal was found by Cheapflights users on 4/29. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2312:15 pmDEN - YOW
1 stop10h 26mWestJet
Thu 7/317:15 pmYOW - DEN
1 stop25h 37mWestJet
Deal found 4/29$371
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2510:29 pmDEN - YHM
2 stops24h 12mMultiple Airlines
Fri 5/306:00 amYHM - DEN
1 stop14h 52mMultiple Airlines
Deal found 4/29$392

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 May 1, 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 6/6

7:40 pm-6:12 am

1 stop8h 32m

Toronto Pearson Intl

Sun 6/8

11:00 am-6:52 pm

1 stop9h 52m

$239

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Wed 7/9

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Wed 7/23

5:30 pm-11:27 am

1 stop19h 57m

$268

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Sat 5/17

12:15 pm-12:46 am

1 stop10h 31m

Toronto Region of Waterloo Intl

Fri 5/23

6:00 am-6:52 pm

1 stop14h 52m

$285

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

Sat 5/17

12:15 pm-12:41 am

1 stop10h 26m

Hamilton

Fri 5/23

6:00 am-6:52 pm

1 stop14h 52m

$303

DenverLondon

DEN - YXU

DENYXU

Denver Intl

Sat 5/31

12:15 pm-5:14 am

1 stop14h 59m

London

Sat 6/7

8:00 pm-11:27 am

1 stop17h 27m

$304

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 6/27

12:15 pm-10:54 pm

1 stop8h 39m

Toronto Pearson Intl

Tue 7/1

12:00 pm-4:01 am

2 stops18h 01m

$316

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Wed 7/2

8:21 pm-12:20 pm

1 stop13h 59m

Toronto Island

Sat 7/5

7:55 am-4:33 pm

1 stop10h 38m

$318

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 9/18

5:55 pm-11:38 am

1 stop15h 43m

Toronto Pearson Intl

Sun 9/21

7:30 am-3:43 pm

1 stop10h 13m

$339

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Wed 6/11

6:07 pm-12:30 pm

1 stop16h 23m

Montreal Pierre Elliott Trudeau Intl

Sun 6/15

8:15 am-9:19 am

1 stop27h 04m

$364

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Wed 6/25

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Wed 7/2

1:10 pm-1:21 am

1 stop14h 11m

$369

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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 $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 May 1, 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 May 1, 2025.

The most flights from DEN to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (4 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 May 1, 2025.
To help decide which airline to fly from Denver to Ontario, see what other customers have to say about Alaska Airlines, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Entertainment

7.1

Crew

8.5

Boarding

8.2

Food

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Entertainment

7.1

Crew

8.5

Boarding

8.2

Food

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,934 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Entertainment

7.1

Crew

8.5

Boarding

8.2

Food

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Entertainment

7.1

Crew

8.5

Boarding

8.2

Food

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Entertainment

7.1

Crew

8.5

Boarding

8.2

Food

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
WestJet
7.2
Good
2,826 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Entertainment

7.1

Crew

8.5

Boarding

8.2

Food

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

    $83 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Sun Country Air and Air Canada, with prices starting from $159 and $213, 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 (76%), Air Canada (68%) and United Airlines (68%).

  • 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 $967, our data indicates the cheapest price to be $120. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around $321.

  • 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.

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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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Aspen to Vancouver Intl flights
Hayden to Calgary flights
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Aspen to Ottawa flights
Colorado Springs to Winnipeg flights
Colorado Springs to Ottawa flights
Grand Junction to Edmonton flights
Durango to Calgary flights

Top 3 airlines flying from Denver to Ontario

Discover the top 3 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$217Average$702FlexibilityNo cancel feeOn-time67%
WestJetCheapest$265Average$394FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$289Average$548FlexibilityNo cancel feeOn-time69%

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