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Ontario

$98+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Jan 7 — Jan 141
Wed 1/7
Wed 1/14
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 8, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/5. 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 12/139:34 amDEN - YYZ
1 stop11h 01mMultiple Airlines
Sat 1/107:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 12/5$355
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:15 amDEN - YTZ
1 stop6h 40mAir Canada
Fri 12/1212:30 pmYTZ - DEN
1 stop9h 25mAir Canada
Deal found 12/7$410
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:15 amDEN - YTZ
1 stop6h 40mAir Canada
Sun 12/1412:30 pmYTZ - DEN
1 stop9h 25mAir Canada
Deal found 12/7$411
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1111:15 amDEN - YTZ
1 stop6h 40mAir Canada
Fri 12/1212:30 pmYTZ - DEN
1 stop9h 25mAir Canada
Deal found 12/7$412
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:15 amDEN - YTZ
1 stop6h 40mAir Canada
Sun 12/1412:30 pmYTZ - DEN
1 stop9h 25mAir Canada
Deal found 12/7$413
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:15 amDEN - YTZ
1 stop6h 40mAir Canada
Thu 12/1112:30 pmYTZ - DEN
1 stop9h 25mAir Canada
Deal found 12/7$416
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1211:15 amDEN - YTZ
1 stop6h 40mAir Canada
Tue 12/1610:30 amYTZ - DEN
1 stop11h 25mAir Canada
Deal found 12/7$427
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:15 amDEN - YTZ
1 stop6h 40mAir Canada
Tue 12/1610:30 amYTZ - DEN
1 stop11h 25mAir Canada
Deal found 12/7$428
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:15 amDEN - YTZ
1 stop8h 20mAir Canada
Wed 12/1012:30 pmYTZ - DEN
1 stop9h 25mAir Canada
Deal found 12/7$430
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/911:15 amDEN - YTZ
1 stop8h 20mAir Canada
Fri 12/1212:30 pmYTZ - DEN
1 stop9h 25mAir Canada
Deal found 12/7$431
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/911:15 amDEN - YTZ
1 stop8h 20mAir Canada
Tue 12/1610:30 amYTZ - DEN
1 stop11h 25mAir Canada
Deal found 12/7$433
This deal was found by Cheapflights users on 12/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/811:15 amDEN - YTZ
1 stop8h 20mAir Canada
Tue 12/1610:30 amYTZ - DEN
1 stop11h 25mAir Canada
Deal found 12/7$434

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 8, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$312
(Kiwi.com)

One-way from

$100
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$575

Good round-trip deal

$567 or less

Good one-way deal

$280 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 ($1 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 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 8, 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

Thu 1/8

9:10 am-3:35 pm

1 stop28h 25m

Toronto Pearson Intl

Wed 1/14

6:20 pm-1:37 am

1 stop9h 17m

$339

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 1/8

6:10 am-6:55 pm

1 stop10h 45m

Toronto Island

Wed 1/14

3:00 pm-1:37 am

1 stop12h 37m

$353

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Mon 1/12

1:42 pm-5:25 pm

2 stops25h 43m

Ottawa

Mon 1/19

3:55 pm-1:37 am

1 stop11h 42m

$366

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Mon 1/5

7:35 am-8:00 pm

1 stop10h 25m

Toronto Island

Mon 1/12

8:50 am-10:22 am

1 stop27h 32m

$376

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Mon 1/19

11:59 pm-5:13 pm

1 stop15h 14m

Ottawa

Fri 1/30

7:15 pm-12:19 pm

2 stops19h 04m

$382

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Mon 1/12

1:34 pm-3:35 pm

1 stop24h 01m

Toronto Pearson Intl

Sun 1/18

4:45 pm-12:38 pm

1 stop21h 53m

$393

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 2/6

5:09 pm-3:35 pm

1 stop20h 26m

Toronto Pearson Intl

Sun 2/8

4:45 pm-12:38 pm

1 stop21h 53m

$393

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 1/16

7:00 am-3:35 pm

1 stop30h 35m

Toronto Pearson Intl

Sun 1/18

4:45 pm-12:38 pm

1 stop21h 53m

$393

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 1/6

6:48 pm-3:35 pm

2 stops18h 47m

Toronto Pearson Intl

Tue 1/13

4:45 pm-11:58 pm

2 stops33h 13m

$397

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Fri 1/16

11:59 pm-5:13 pm

1 stop15h 14m

Ottawa

Mon 1/19

7:00 am-4:22 pm

2 stops11h 22m

$399

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

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 8, 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 8, 2025.

The most flights from DEN to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (5 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 8, 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
8,011 reviews

Boarding

8.1

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

7.9

Comfort

7.9

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
8,011 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

7.9

Comfort

7.9

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
9,078 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

7.9

Comfort

7.9

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
3,193 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

7.9

Comfort

7.9

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
10,512 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

7.9

Comfort

7.9

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, American Airlines, and United Airlines fly from Denver to Region of Ontario in about 13h 21m. The time it takes to get you to your destination can typically vary by up to 10h 40m. The distance between Denver and Region of Ontario is about 1233 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 (87%), United Airlines (81%) and Air Canada (81%).

  • 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 $673, our data indicates the cheapest price to be $225. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around $381.

  • 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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Denver to Cranbrook flights
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Grand Junction to Thunder Bay flights
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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 8, 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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