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Ontario

$88+ 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 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Cheap 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 December 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/3011:05 amDEN - YYZ
1 stop10h 50mMultiple Airlines
Sun 1/118:00 pmYYZ - DEN
1 stop9h 58mMultiple Airlines
Deal found 12/20$478
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/3011:05 amDEN - YYZ
1 stop10h 50mMultiple Airlines
Sat 1/107:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 12/20$483
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/318:45 pmDEN - YYZ
2 stops12h 34mMultiple Airlines
Sat 1/107:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 12/20$500
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/3011:05 amDEN - YYZ
1 stop10h 50mMultiple Airlines
Fri 1/97:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 12/20$519
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/318:45 pmDEN - YTZ
1 stop20h 12mMultiple Airlines
Sun 1/118:50 amYTZ - DEN
1 stop9h 25mMultiple Airlines
Deal found 12/20$521
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/3110:29 pmDEN - YYZ
1 stop19h 23mMultiple Airlines
Sun 1/117:15 amYYZ - DEN
1 stop10h 18mMultiple Airlines
Deal found 12/20$528
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/318:45 pmDEN - YTZ
1 stop20h 12mMultiple Airlines
Sat 1/1012:30 pmYTZ - DEN
1 stop9h 55mMultiple Airlines
Deal found 12/20$532
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/318:45 pmDEN - YYZ
2 stops12h 34mMultiple Airlines
Fri 1/97:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 12/20$535
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/3011:05 amDEN - YYZ
1 stop10h 50mMultiple Airlines
Thu 1/87:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 12/20$541
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/3011:05 amDEN - YYZ
1 stop10h 50mMultiple Airlines
Wed 1/79:35 amYYZ - DEN
1 stop11h 02mMultiple Airlines
Deal found 12/20$544
This Kiwi.com deal was found by Cheapflights users on 12/20. 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.
Mon 12/294:25 pmDEN - YYZ
1 stop13h 30mMultiple Airlines
Sat 1/107:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 12/20$555
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/264:25 pmDEN - YTZ
1 stop16h 10mMultiple Airlines
Thu 1/88:50 amYTZ - DEN
1 stop9h 25mMultiple Airlines
Deal found 12/20$556

Find flight deals from Denver to Ontario

Keep the following information in mind while searching for Denver to Ontario flight deals. Data was last updated December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$228
(Kiwi.com)

One-way from

$88
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$588

Good round-trip deal

$551 or less

Good one-way deal

$308 or less
Provider with most accurate pricing for Denver Intl-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Toronto (YTO) flights.
Search Deals
From Denver Intl to Ontario
Search Deals
One-way flight from Denver Intl to Ontario
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($2 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Denver Intl to Ontario.
Search Deals
Price to beat on a one-way flight from Denver Intl to Ontario.
Search Deals

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 December 23, 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

Wed 1/21

9:44 pm-9:11 pm

2 stops21h 27m

Toronto Pearson Intl

Wed 1/28

9:35 am-7:19 pm

1 stop11h 44m

$247

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 2/24

9:31 pm-9:22 pm

1 stop21h 51m

Toronto Pearson Intl

Fri 2/27

7:55 pm-3:56 am

1 stop10h 01m

$291

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Tue 2/17

7:48 am-1:10 pm

1 stop27h 22m

Toronto Island

Thu 2/19

9:20 am-6:23 pm

1 stop11h 03m

$300

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Wed 1/21

11:37 am-1:09 pm

1 stop23h 32m

Toronto Island

Wed 1/28

8:50 am-4:22 pm

1 stop9h 32m

$313

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Tue 1/13

4:38 pm-1:09 pm

1 stop18h 31m

Toronto Island

Sun 1/18

8:50 am-10:22 am

1 stop27h 32m

$317

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 2/17

7:00 am-3:35 pm

1 stop30h 35m

Toronto Pearson Intl

Thu 2/19

4:45 pm-11:59 pm

1 stop9h 14m

$328

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Wed 1/28

7:30 am-12:25 am

2 stops14h 55m

Ottawa

Sat 1/31

9:40 am-6:59 pm

1 stop11h 19m

$328

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 1/8

4:38 pm-1:09 pm

1 stop18h 31m

Toronto Island

Wed 1/14

3:00 pm-1:37 am

1 stop12h 37m

$337

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 1/30

11:49 am-3:35 pm

2 stops25h 46m

Toronto Pearson Intl

Wed 2/4

4:45 pm-10:53 am

2 stops20h 08m

$352

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 1/20

6:32 pm-5:13 pm

1 stop20h 41m

Ottawa

Fri 1/23

9:30 am-5:36 pm

1 stop10h 06m

$361

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/23

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, June is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of $129). Flying from Denver to Region of Ontario in February is currently the most expensive (average of $232). 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 December 23, 2025.

When flying from Denver to Region of Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 34% versus a flight in the evening.

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 December 23, 2025.

The most flights from DEN to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Monday, 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 December 23, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and WestJet from Denver to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,015 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,106 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
WestJet
7.2
Good
3,216 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,551 reviews
Delta
7.9
Good
8,015 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.1

Crew

8.5

Food

7.3

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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.

  • How long is the flight from Denver to Region of Ontario?

    Airlines like Alaska Airlines, Air Canada, and American Airlines fly from Denver to Region of Ontario in about 3h 43m. The time it takes to get you to your destination can typically vary by up to 26h 52m. The distance between Denver and Region of Ontario is about 1606 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    $150 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Air Canada and Delta, with prices starting from $167 and $218, 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 (86%), Air Canada (78%) and United Airlines (77%).

  • 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 $621, our data indicates the cheapest price to be $194. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around $345.

  • 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, June is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of $129). Flying from Denver to Region of Ontario in February is currently the most expensive (average of $232). 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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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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$143Average$303FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$218Average$532FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$289Average$513FlexibilityNo cancel feeOn-time69%

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