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$84+ 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 12/17. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
nov. 26 — dic. 31
mié. 11/26
mié. 12/3
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 octubre 27, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$263
(Kiwi.com)

One-way from

$84
(Trip.com)

Popular in

November

Cheapest in

March

Average price

$533

Good round-trip deal

$559 or less

Good one-way deal

$338 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 ($31 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in October 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 octubre 27, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
mar. 12/911:59 pmDEN - YOW
1 stop15h 14mMultiple Airlines
mar. 12/169:30 amYOW - DEN
1 stop12h 43mMultiple Airlines
Deal found 10/25$312
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
vie. 12/511:59 pmDEN - YOW
1 stop15h 14mMultiple Airlines
mar. 12/99:30 amYOW - DEN
1 stop12h 43mMultiple Airlines
Deal found 10/26$320
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
mar. 12/99:44 pmDEN - YHM
2 stops43h 16mMultiple Airlines
mar. 12/167:00 amYHM - DEN
1 stop15h 13mMultiple Airlines
Deal found 10/25$333
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
mar. 12/2312:14 amDEN - YYZ
2 stops19h 05mMultiple Airlines
dom. 1/47:55 pmYYZ - DEN
1 stop10h 03mMultiple Airlines
Deal found 10/25$334
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
jue. 12/412:59 amDEN - YYZ
2 stops20h 39mMultiple Airlines
lun. 12/82:20 pmYYZ - DEN
1 stop20h 50mMultiple Airlines
Deal found 10/25$336
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
sáb. 11/157:59 pmDEN - YTZ
1 stop15h 43mMultiple Airlines
vie. 11/212:30 pmYTZ - DEN
1 stop20h 30mMultiple Airlines
Deal found 10/25$337
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
jue. 12/46:00 amDEN - YYZ
2 stops16h 11mMultiple Airlines
dom. 12/77:10 amYYZ - DEN
1 stop17h 54mMultiple Airlines
Deal found 10/25$337
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
sáb. 12/611:59 pmDEN - YYZ
1 stop12h 21mMultiple Airlines
lun. 12/88:30 pmYYZ - DEN
2 stops18h 02mMultiple Airlines
Deal found 10/26$341
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
dom. 11/98:05 amDEN - YTZ
1 stop8h 52mMultiple Airlines
mié. 11/129:15 amYTZ - DEN
2 stops31h 26mMultiple Airlines
Deal found 10/26$343
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
sáb. 11/2210:08 amDEN - YYZ
1 stop10h 52mMultiple Airlines
mié. 12/39:35 amYYZ - DEN
1 stop14h 54mMultiple Airlines
Deal found 10/26$343
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
lun. 11/1712:59 amDEN - YYZ
2 stops32h 44mMultiple Airlines
mar. 11/2512:40 pmYYZ - DEN
1 stop13h 03mMultiple Airlines
Deal found 10/25$351
This Alaska Airlines deal was found by Cheapflights users on 10/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/178:02 pmDEN - YYZ
1 stop17h 33mAlaska Airlines
mié. 11/194:45 pmYYZ - DEN
1 stop9h 14mAlaska Airlines
Deal found 10/27$354

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 octubre 27, 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

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

sáb. 1/10

11:59 pm-11:58 pm

1 stop21h 59m

Ottawa

lun. 1/19

4:20 pm-3:55 pm

1 stop25h 35m

$263

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

dom. 1/11

11:59 pm-5:13 pm

1 stop15h 14m

Ottawa

vie. 1/16

9:30 am-5:41 pm

1 stop10h 11m

$290

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

vie. 1/9

8:45 am-11:58 pm

1 stop13h 13m

Ottawa

jue. 1/15

4:20 pm-7:55 am

1 stop17h 35m

$290

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

dom. 1/11

11:59 pm-5:13 pm

1 stop15h 14m

Ottawa

jue. 1/15

4:20 pm-7:55 am

1 stop17h 35m

$290

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

vie. 1/9

6:31 pm-4:51 pm

2 stops20h 20m

Ottawa

dom. 1/18

9:30 am-11:12 pm

1 stop15h 42m

$300

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

vie. 12/5

11:59 pm-5:13 pm

1 stop15h 14m

Ottawa

mar. 12/9

9:30 am-8:13 pm

1 stop12h 43m

$320

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

dom. 1/11

12:59 am-5:13 pm

2 stops14h 14m

Ottawa

sáb. 1/17

4:20 pm-7:55 am

1 stop17h 35m

$326

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

mar. 12/9

9:44 pm-7:00 pm

2 stops43h 16m

Hamilton

mar. 12/16

7:00 am-8:13 pm

1 stop15h 13m

$333

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

sáb. 11/15

7:59 pm-1:42 pm

1 stop15h 43m

Toronto Island

vie. 11/21

2:30 pm-9:00 am

1 stop20h 30m

$337

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

dom. 1/11

12:59 am-5:13 pm

2 stops14h 14m

Ottawa

vie. 1/16

9:30 am-5:41 pm

1 stop10h 11m

$340

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

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 octubre 27, 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 octubre 27, 2025.

The most flights from DEN to CAON are scheduled on a Sunday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 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 octubre 27, 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
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,996 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,999 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
WestJet
7.2
Good
3,147 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Air Canada
7.1
Good
10,367 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Overall

7.9

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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 11h 50m. The time it takes to get you to your destination can typically vary by up to 18h 45m. 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 most popular routes from Denver to Region of Ontario?

    The most popular route from Denver to Region of Ontario is Denver Intl - Toronto Pearson Intl. You may also consider Denver Intl - Montreal Pierre Elliott Trudeau 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 Brussels Airlines (79%), Air Canada (77%) and United Airlines (76%).

  • 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 $629, our data indicates the cheapest price to be $252. The most popular route (Denver Intl - Toronto Pearson Intl), is priced around $235.

  • 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.
Denver to Vancouver Intl flights
Denver to Pearson Intl flights
Denver to Pierre Elliott Trudeau Intl flights
Denver to Calgary flights
Denver to Kelowna flights
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Denver to Edmonton flights
Denver to Québec City flights
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Denver to Winnipeg flights
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Denver to Halifax flights
Denver to Victoria flights
Denver to Region of Waterloo Intl flights
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Montrose to Calgary flights
Denver to Hamilton flights
Grand Junction to Vancouver Intl flights
Durango to Calgary flights
Denver to St. John's flights
Denver to Saskatoon flights
Durango to Pearson Intl flights
Colorado Springs to Pierre Elliott Trudeau Intl flights
Colorado Springs to Vancouver Intl flights
Colorado Springs to Calgary flights
Vail to Vancouver Intl flights
Aspen to Vancouver Intl flights
Vail to Pearson Intl flights
Denver to Fredericton flights
Denver to London flights
Colorado Springs to St. John's flights
Denver to Whitehorse flights
Grand Junction to Calgary flights
Colorado Springs to Edmonton flights
Aspen to Ottawa flights
Denver to Charlottetown flights
Grand Junction to Thunder Bay flights
Denver to Terrace flights
Colorado Springs to Victoria flights
Grand Junction to Edmonton flights
Colorado Springs to Ottawa flights
Colorado Springs to Québec City flights
Hayden to Calgary flights
Colorado Springs to Winnipeg flights
Denver to Moncton 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 octubre 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$143Average$303FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$221Average$528FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$289Average$515FlexibilityNo cancel feeOn-time69%

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