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$101+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
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 January 21, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/20. 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 3/26:00 am
DEN
-
YYZ
2 stops30h 20m
Multiple Airlines
Wed 3/47:15 am
YYZ
-
DEN
1 stop17h 44m
Multiple Airlines
Deal found 1/20$252
This Kiwi.com deal was found by Cheapflights users on 1/21. 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 3/3112:59 am
DEN
-
YYZ
1 stop18h 20m
Multiple Airlines
Tue 4/71:30 pm
YYZ
-
DEN
2 stops16h 29m
Multiple Airlines
Deal found 1/21$258
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 3/211:59 pm
DEN
-
YYZ
1 stop12h 21m
Multiple Airlines
Thu 3/57:15 am
YYZ
-
DEN
2 stops22h 41m
Multiple Airlines
Deal found 1/20$262
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Sun 3/11:18 pm
DEN
-
YYZ
2 stops28h 18m
Multiple Airlines
Wed 3/47:15 am
YYZ
-
DEN
1 stop17h 44m
Multiple Airlines
Deal found 1/20$271
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 2/1711:59 pm
DEN
-
YYZ
1 stop12h 21m
Multiple Airlines
Mon 2/238:00 pm
YYZ
-
DEN
1 stop9h 56m
Multiple Airlines
Deal found 1/20$273
This Kiwi.com deal was found by Cheapflights users on 1/21. 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 2/2511:59 pm
DEN
-
YYZ
1 stop12h 17m
Multiple Airlines
Wed 3/44:45 pm
YYZ
-
DEN
1 stop26h 22m
Multiple Airlines
Deal found 1/21$285
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 2/276:21 pm
DEN
-
YYZ
1 stop9h 59m
Multiple Airlines
Sun 3/17:55 pm
YYZ
-
DEN
1 stop10h 01m
Multiple Airlines
Deal found 1/20$289
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Sun 3/1510:30 pm
DEN
-
YYZ
1 stop30h 13m
Multiple Airlines
Fri 3/208:00 pm
YYZ
-
DEN
1 stop9h 56m
Multiple Airlines
Deal found 1/20$292
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 2/144:38 pm
DEN
-
YTZ
1 stop25h 22m
Multiple Airlines
Fri 2/209:20 am
YTZ
-
DEN
2 stops39h 57m
Multiple Airlines
Deal found 1/19$323
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 2/136:05 am
DEN
-
YTZ
2 stops27h 35m
Multiple Airlines
Thu 2/199:20 am
YTZ
-
DEN
1 stop11h 03m
Multiple Airlines
Deal found 1/19$328
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 2/124:38 pm
DEN
-
YTZ
1 stop25h 22m
Multiple Airlines
Thu 2/199:20 am
YTZ
-
DEN
1 stop11h 03m
Multiple Airlines
Deal found 1/19$335
This Kiwi.com deal was found by Cheapflights users on 1/21. 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 2/138:24 am
DEN
-
YTZ
1 stop29h 08m
Multiple Airlines
Fri 2/209:20 am
YTZ
-
DEN
2 stops34h 03m
Multiple Airlines
Deal found 1/21$353

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 January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$252
(Kiwi.com)

One-way from

$101
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$317

Good round-trip deal

$569 or less

Good one-way deal

$473 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
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 21, 2026.
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

Sun 3/15

10:30 pm-6:43 am

1 stop30h 13m

Toronto Pearson Intl

Fri 3/20

8:00 pm-3:56 am

1 stop9h 56m

$292

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Sat 2/14

4:38 pm-8:00 pm

1 stop25h 22m

Toronto Island

Fri 2/20

9:20 am-11:17 pm

2 stops39h 57m

$323

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Fri 2/13

6:05 am-11:40 am

2 stops27h 35m

Toronto Island

Thu 2/19

9:20 am-6:23 pm

1 stop11h 03m

$328

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Thu 2/12

4:38 pm-8:00 pm

1 stop25h 22m

Toronto Island

Thu 2/19

9:20 am-6:23 pm

1 stop11h 03m

$335

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Thu 4/2

10:45 am-9:09 pm

1 stop8h 24m

Toronto Pearson Intl

Sun 4/5

10:15 pm-3:59 am

2 stops31h 44m

$343

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Mon 3/23

9:10 am-3:35 pm

1 stop28h 25m

Toronto Pearson Intl

Wed 3/25

7:15 am-11:09 pm

1 stop17h 54m

$347

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 3/10

7:00 am-3:35 pm

1 stop30h 35m

Toronto Pearson Intl

Mon 3/16

4:45 pm-9:23 pm

1 stop30h 38m

$354

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 3/6

7:00 am-3:35 pm

1 stop30h 35m

Toronto Pearson Intl

Fri 3/13

4:45 pm-11:59 pm

1 stop9h 14m

$378

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Tue 2/10

7:00 am-3:35 pm

1 stop30h 35m

Toronto Pearson Intl

Tue 2/17

4:45 pm-10:42 am

2 stops19h 57m

$394

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 2/20

6:00 am-5:15 pm

1 stop9h 15m

Toronto Pearson Intl

Mon 2/23

8:00 pm-3:56 am

1 stop9h 56m

$412

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

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 $132). Flying from Denver to Region of Ontario in November is currently the most expensive (average of $222). 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 January 21, 2026.

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 January 21, 2026.

The most flights from DEN to CAON are scheduled on a Monday (7 on average). You will have fewer flight options on Tuesday, 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 January 21, 2026.
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
8,086 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Crew

8.5

Food

7.2

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
8,086 reviews
Delta
7.9
Good
8,086 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Crew

8.5

Food

7.2

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
9,190 reviews
Delta
7.9
Good
8,086 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Crew

8.5

Food

7.2

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
3,247 reviews
Delta
7.9
Good
8,086 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Crew

8.5

Food

7.2

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
10,644 reviews
Delta
7.9
Good
8,086 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.8

Comfort

7.9

Crew

8.5

Food

7.2

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, WestJet, and Delta fly from Denver to Region of Ontario in about 9h 15m. The time it takes to get you to your destination can typically vary by up to 21h 20m. The distance between Denver and Region of Ontario is about 1513 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?

    $124 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $150 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 (65%), Air Canada (62%) and United Airlines (62%).

  • 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 $847, our data indicates the cheapest price to be $198. The most popular route (Denver Intl - Montreal Pierre Elliott Trudeau Intl), is priced around $355.

  • 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 $132). Flying from Denver to Region of Ontario in November is currently the most expensive (average of $222). 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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Aspen to Ottawa flights
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Denver to Campbell River 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 January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$130Average$303FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$199Average$516FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$224Average$511FlexibilityNo cancel feeOn-time69%

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