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Ontario

$121+ 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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$268
(Kiwi.com)

One-way from

$121
(Kiwi.com)

Popular in

November

Cheapest in

March

Average price

$525

Good round-trip deal

$467 or less

Good one-way deal

$201 or less
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 ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/2. 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 8/259:00 pmDEN - YTZ
1 stop13h 20mMultiple Airlines
Wed 9/33:35 pmYTZ - DEN
1 stop18h 06mMultiple Airlines
Deal found 7/2$268
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/245:40 pmDEN - YUL
Nonstop3h 46mAir Canada
Wed 7/308:05 amYUL - DEN
Nonstop4h 16mAir Canada
Deal found 7/3$307
This Kiwi.com deal was found by Cheapflights users on 7/1. 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 9/912:15 pmDEN - YUL
1 stop10h 26mMultiple Airlines
Tue 9/161:10 pmYUL - DEN
2 stops21h 57mMultiple Airlines
Deal found 7/1$319
This Kiwi.com deal was found by Cheapflights users on 7/3. 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 9/1912:15 pmDEN - YYZ
1 stop8h 37mWestJet
Mon 9/2210:25 pmYYZ - DEN
1 stop14h 59mWestJet
Deal found 7/3$319
This Kiwi.com deal was found by Cheapflights users on 7/1. 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 8/2112:15 pmDEN - YUL
1 stop10h 28mWestJet
Mon 8/255:30 pmYUL - DEN
1 stop19h 57mWestJet
Deal found 7/1$322
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/177:05 pmDEN - YTZ
2 stops14h 26mAir Canada
Sun 8/2412:25 pmYTZ - DEN
1 stop7h 55mAir Canada
Deal found 7/3$323
This Kiwi.com deal was found by Cheapflights users on 7/1. 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 9/812:15 pmDEN - YYZ
1 stop8h 37mMultiple Airlines
Fri 9/124:00 pmYYZ - DEN
1 stop19h 03mMultiple Airlines
Deal found 7/1$323
This Trip.com deal was found by Cheapflights users on 7/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/1512:15 pmDEN - YOW
1 stop10h 26mWestJet
Sun 7/207:50 amYOW - DEN
1 stop29h 37mWestJet
Deal found 7/2$333
This Mytrip deal was found by Cheapflights users on 7/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2512:15 pmDEN - YKF
1 stop15h 00mMultiple Airlines
Wed 9/36:00 amYKF - DEN
2 stops15h 23mMultiple Airlines
Deal found 7/2$344
This Air Canada deal was found by Cheapflights users on 7/2. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/147:05 pmDEN - YOW
1 stop11h 14mAir Canada
Tue 7/226:00 amYOW - DEN
1 stop6h 21mAir Canada
Deal found 7/2$362
This Mytrip deal was found by Cheapflights users on 7/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/112:15 pmDEN - YKF
1 stop10h 31mWestJet
Tue 8/57:45 pmYKF - DEN
1 stop17h 42mWestJet
Deal found 7/2$364
This Gotogate deal was found by Cheapflights users on 7/1. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/257:45 amDEN - YYZ
Nonstop3h 13mAir Canada
Wed 9/36:20 pmYYZ - DEN
Nonstop3h 34mAir Canada
Deal found 7/1$366

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 July 3, 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 - YTZ

DENYTZ

Denver Intl

Mon 8/25

9:00 pm-12:20 pm

1 stop13h 20m

Toronto Island

Wed 9/3

3:35 pm-7:41 am

1 stop18h 06m

$268

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Thu 7/24

5:40 pm-11:26 pm

Nonstop3h 46m

Montreal Pierre Elliott Trudeau Intl

Wed 7/30

8:05 am-10:21 am

Nonstop4h 16m

$307

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Fri 9/19

12:15 pm-10:52 pm

1 stop8h 37m

Toronto Pearson Intl

Mon 9/22

10:25 pm-11:24 am

1 stop14h 59m

$319

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Tue 9/9

12:15 pm-12:41 am

1 stop10h 26m

Montreal Pierre Elliott Trudeau Intl

Tue 9/16

1:10 pm-9:07 am

2 stops21h 57m

$319

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

Thu 8/21

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

Mon 8/25

5:30 pm-11:27 am

1 stop19h 57m

$322

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

Sun 8/17

7:05 pm-11:31 am

2 stops14h 26m

Toronto Island

Sun 8/24

12:25 pm-6:20 pm

1 stop7h 55m

$323

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

Mon 9/8

12:15 pm-10:52 pm

1 stop8h 37m

Toronto Pearson Intl

Fri 9/12

4:00 pm-9:03 am

1 stop19h 03m

$323

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Tue 7/15

12:15 pm-12:41 am

1 stop10h 26m

Ottawa

Sun 7/20

7:50 am-11:27 am

1 stop29h 37m

$333

DenverToronto

DEN - YKF

DENYKF

Denver Intl

Mon 8/25

12:15 pm-5:15 am

1 stop15h 00m

Toronto Region of Waterloo Intl

Wed 9/3

6:00 am-7:23 pm

2 stops15h 23m

$344

DenverOttawa

DEN - YOW

DENYOW

Denver Intl

Mon 7/14

7:05 pm-8:19 am

1 stop11h 14m

Ottawa

Tue 7/22

6:00 am-10:21 am

1 stop6h 21m

$362

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 43 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 August is currently the most expensive (average of $348). 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 July 3, 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 July 3, 2025.

The most flights from DEN to CAON are scheduled on a Monday (11 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (10 on average).

How much does it cost to fly round-trip from Denver to Region of Ontario?

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 July 3, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from Denver to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
WestJet
7.2
Good
2,917 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,681 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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?

    $141 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Air Canada and United Airlines, with prices starting from $150 and $154, 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 - 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 Austrian Airlines (74%), Air Canada (73%) and United Airlines (73%).

  • 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 $1,578, our data indicates the cheapest price to be $167. The most popular route (Denver Intl - Toronto Pearson 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 August is currently the most expensive (average of $348). 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 Calgary flights
Denver to Pierre Elliott Trudeau Intl flights
Denver to Regina flights
Denver to Abbotsford flights
Denver to Toronto Island flights
Denver to Québec City flights
Denver to Winnipeg flights
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Denver to Region of Waterloo Intl flights
Denver to Halifax flights
Denver to Edmonton flights
Denver to Hamilton flights
Denver to Ottawa flights
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Colorado Springs to Calgary flights
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Grand Junction to Vancouver Intl flights
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Denver to Yellowknife flights
Denver to St. John's flights
Montrose to Calgary flights
Aspen to Vancouver Intl flights
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Grand Junction to Edmonton flights
Denver to Sydney flights
Grand Junction to Thunder Bay flights
Denver to Smithers flights
Colorado Springs to Victoria flights
Denver to Whitehorse flights
Denver to Fredericton flights
Montrose to Vancouver Intl flights
Aspen to Halifax flights
Colorado Springs to Ottawa flights
Grand Junction to Calgary flights
Hayden to Calgary flights
Aspen to Ottawa flights
Vail to Pearson Intl flights
Durango to Pearson Intl flights
Colorado Springs to Edmonton flights
Colorado Springs to Québec City flights
Colorado Springs to Winnipeg flights

Top 4 airlines flying from Denver to Ontario

Discover the top 4 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$143Average$303FlexibilityNo cancel feeOn-time60%
Air CanadaCheapest$230Average$510FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$277Average$505FlexibilityNo cancel feeOn-time69%
DeltaCheapest$373Average$483FlexibilityNo cancel feeOn-timeN/A

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