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

For as low as $268, United Airlines can have you in Denver from Region of Ontario in 7h 25m. The distance between Region of Ontario and Denver is about 1513 mi. Both multi-stop and nonstop flights can be found to your destination and back.

In terms of precipitation, rainfall in Denver ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Denver when rainfall is around 0.5 in.

If weather is an important factor for your trip to Denver, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

What are the most popular routes from Region of Ontario to Denver?

While some choose either Montreal Pierre Elliott Trudeau Intl - Denver Intl or Ottawa - Denver Intl, Toronto Pearson Intl - Denver Intl is the most popular route from Region of Ontario to Denver.

What are the cheapest flights from Region of Ontario to Denver?

Looking for the cheapest flight from Region of Ontario to Denver? While on average our users pay $1,051, our data indicates the cheapest price to be $204. The most popular route (Toronto Pearson Intl - Denver Intl), is priced around $232.

What are the most reliable airlines from Region of Ontario to Denver?

The top 3 most reliable airlines when flying from Region of Ontario to Denver are Air Canada (57%), United Airlines (57%) and Austrian Airlines (27%).

How far in advance should I book a flight from Region of Ontario to Denver?

Find a great deal and save up to 132% by booking at least 55 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Region of Ontario to Denver within the next two weeks, with the cheapest ticket starting at $438.

What is the cheapest month to fly from Region of Ontario to Denver?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, August can be a great choice for travel to Denver. Flights to Denver from Region of Ontario in August are about $452 on average during August, but can be found for as low as $186.

What airport do you fly into for flights to Denver from Ontario?

For a flight from Ontario to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.

Can I find deals for flights from Ontario to Denver that include hotel bookings?

Yes. In addition to deals on Ontario to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to Denver?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Denver.

Can I find deals for business class flights from Ontario to Denver?

Yes. Cheapflights offers flight deals from Ontario to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$128+ Cheap Flights from Ontario to Denver

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

Airfare is below average for this route at the moment. Region of Ontario to Denver flights typically cost between $416 and $583 in October. The cheapest round-trip price found within the last 3 days was $308 on Multiple Airlines (Oct 30-Nov 1).

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Ontario to Denver with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Denver

Round-trip from	$268 (United Airlines)
One-way from	$128 (Kiwi.com)
Popular in	December
Cheapest in	August
Average price	$424
Good round-trip deal	$361 or less
Good one-way deal	$245 or less

From Ontario to Denver Intl

Search Deals

One-way flight from Ontario to Denver Intl

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($20 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Price to beat on a round-trip flight from Ontario to Denver Intl.

Search Deals

Price to beat on a one-way flight from Ontario to Denver Intl.

Search Deals

Find flight deals from Ontario to Denver

Cheapest flights from Ontario to Denver
Explore the most affordable flight options available from Ontario to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Wed 10/155:50 pmYOW - DEN

1 stop7h 25mUnited Airlines

Sat 10/257:48 amDEN - YOW

1 stop7h 18mUnited Airlines

Deal found 9/10

$268

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mMultiple Airlines

Tue 10/77:00 amDEN - YUL

2 stops15h 41mMultiple Airlines

Deal found 9/10

$291

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mMultiple Airlines

Wed 10/88:00 amDEN - YUL

2 stops14h 27mMultiple Airlines

Deal found 9/10

$297

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mMultiple Airlines

Wed 10/16:01 pmDEN - YUL

2 stops28h 26mMultiple Airlines

Deal found 9/10

$299

Thu 10/236:45 amYUL - DEN

1 stop18h 31mMultiple Airlines

Mon 10/277:00 amDEN - YUL

2 stops15h 43mMultiple Airlines

Deal found 9/10

$303

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mWestJet

Mon 9/2912:15 pmDEN - YUL

2 stops34h 12mWestJet

Deal found 9/10

$304

Thu 10/301:30 pmYYZ - DEN

3 stops24h 30mMultiple Airlines

Sat 11/112:16 amDEN - YYZ

1 stop13h 04mMultiple Airlines

Deal found 9/10

$308

Sun 9/214:00 pmYYZ - DEN

1 stop18h 16mMultiple Airlines

Fri 10/312:15 pmDEN - YYZ

1 stop10h 07mMultiple Airlines

Deal found 9/9

$309

Mon 9/152:00 pmYYZ - DEN

2 stops16h 00mMultiple Airlines

Fri 10/312:15 pmDEN - YYZ

1 stop10h 07mMultiple Airlines

Deal found 9/9

$310

Wed 11/56:00 amYYZ - DEN

1 stop18h 22mAmerican Airlines

Tue 11/117:22 amDEN - YYZ

1 stop12h 07mAmerican Airlines

Deal found 9/9

$311

Sun 9/2110:25 pmYYZ - DEN

2 stops38h 31mMultiple Airlines

Wed 10/1510:29 pmDEN - YYZ

1 stop19h 16mMultiple Airlines

Deal found 9/9

$312

Fri 9/267:45 pmYYZ - DEN

1 stop16h 33mMultiple Airlines

Sun 10/512:04 amDEN - YYZ

2 stops19h 03mMultiple Airlines

Deal found 9/9

$313

Best flights from Ontario to Denver
Discover carefully curated flight deals from Ontario to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2025.

Wed 10/155:50 pmYOW - DEN

1 stop7h 25mUnited Airlines

Sat 10/257:48 amDEN - YOW

1 stop7h 18mUnited Airlines

Deal found 9/10

$268

Tue 3/37:45 amYOW - DEN

1 stop11h 59mAir Canada

Wed 3/411:15 amDEN - YOW

1 stop6h 07mAir Canada

Deal found 9/9

$311

Sun 9/2110:25 pmYYZ - DEN

1 stop14h 59mWestJet

Mon 9/2912:15 pmDEN - YYZ

1 stop8h 37mWestJet

Deal found 9/9

$323

Sat 10/251:35 pmYTZ - DEN

1 stop8h 55mMultiple Airlines

Wed 10/297:40 amDEN - YTZ

1 stop10h 20mMultiple Airlines

Deal found 9/11

$325

Fri 10/36:13 pmYYZ - DEN

1 stop5h 12mDelta

Fri 10/1012:55 amDEN - YYZ

1 stop8h 25mDelta

Deal found 9/9

$349

Thu 1/298:30 amYYZ - DEN

Nonstop3h 53mAir Canada

Mon 2/25:30 pmDEN - YYZ

Nonstop3h 11mAir Canada

Deal found 9/8

$327

Fri 10/171:35 pmYTZ - DEN

1 stop8h 55mMultiple Airlines

Mon 10/206:38 amDEN - YTZ

1 stop9h 15mMultiple Airlines

Deal found 9/10

$329

Fri 10/175:25 pmYOW - DEN

1 stop15h 17mUnited Airlines

Mon 10/2011:59 pmDEN - YOW

2 stops11h 10mUnited Airlines

Deal found 9/9

$333

Sat 10/412:15 pmYYZ - DEN

1 stop7h 05mDelta

Mon 10/612:55 amDEN - YYZ

1 stop6h 00mDelta

Deal found 9/9

$349

Wed 10/11:35 pmYTZ - DEN

1 stop27h 25mMultiple Airlines

Mon 10/68:30 pmDEN - YTZ

1 stop13h 47mMultiple Airlines

Deal found 9/11

$330

Tue 3/310:25 amYTZ - DEN

2 stops11h 30mAir Canada

Wed 3/411:15 amDEN - YTZ

2 stops8h 13mAir Canada

Deal found 9/8

$338

Fri 10/243:35 pmYYZ - DEN

1 stop8h 31mDelta

Sun 10/2612:50 amDEN - YYZ

1 stop9h 20mDelta

Deal found 9/8

$349

Last-minute flights from Ontario to Denver
Discover last-minute flight deals from Ontario to Denver. Data last updated September 11, 2025 and is based on user searches.

Mon 9/152:00 pmYYZ - DEN

2 stops16h 00mMultiple Airlines

Fri 10/312:15 pmDEN - YYZ

1 stop10h 07mMultiple Airlines

Deal found 9/9

$310

Sun 9/214:00 pmYYZ - DEN

1 stop18h 16mMultiple Airlines

Fri 10/312:15 pmDEN - YYZ

1 stop10h 07mMultiple Airlines

Deal found 9/9

$309

Sun 9/2110:25 pmYYZ - DEN

2 stops38h 31mMultiple Airlines

Wed 10/1510:29 pmDEN - YYZ

1 stop19h 16mMultiple Airlines

Deal found 9/9

$312

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mMultiple Airlines

Tue 10/77:00 amDEN - YUL

2 stops15h 41mMultiple Airlines

Deal found 9/10

$291

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mMultiple Airlines

Wed 10/88:00 amDEN - YUL

2 stops14h 27mMultiple Airlines

Deal found 9/10

$297

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mMultiple Airlines

Wed 10/16:01 pmDEN - YUL

2 stops28h 26mMultiple Airlines

Deal found 9/10

$299

Wed 9/245:30 pmYUL - DEN

1 stop19h 54mWestJet

Mon 9/2912:15 pmDEN - YUL

2 stops34h 12mWestJet

Deal found 9/10

$304

Sat 10/46:45 amYUL - DEN

1 stop18h 28mMultiple Airlines

Sun 10/268:21 pmDEN - YUL

2 stops26h 22mMultiple Airlines

Deal found 9/9

$300

Sat 10/46:45 amYUL - DEN

1 stop18h 28mMultiple Airlines

Wed 10/228:00 amDEN - YUL

2 stops14h 41mMultiple Airlines

Deal found 9/9

$303

Sat 10/46:45 amYUL - DEN

1 stop18h 28mMultiple Airlines

Sat 10/258:00 amDEN - YUL

2 stops14h 41mMultiple Airlines

Deal found 9/9

$306

Wed 10/155:50 pmYOW - DEN

1 stop7h 25mUnited Airlines

Sat 10/257:48 amDEN - YOW

1 stop7h 18mUnited Airlines

Deal found 9/10

$268

Thu 10/301:30 pmYYZ - DEN

3 stops24h 30mMultiple Airlines

Sat 11/112:16 amDEN - YYZ

1 stop13h 04mMultiple Airlines

Deal found 9/10

$308

One-way flights from Ontario to Denver
Search for one-way flight options from Ontario to Denver. Find affordable one-way fares based on user searches. Data last updated September 11, 2025.

Mon 10/202:00 pmYYZ - DEN

2 stops24h 21mMultiple Airlines

Deal found 9/9

$128

Mon 12/158:00 pmYYZ - DEN

1 stop9h 58mMultiple Airlines

Deal found 9/9

$129

Tue 12/99:40 amYYZ - DEN

3 stops20h 18mMultiple Airlines

Deal found 9/10

$132

Mon 11/310:00 amYYZ - DEN

3 stops19h 59mMultiple Airlines

Deal found 9/10

$138

Sun 11/167:55 pmYYZ - DEN

1 stop10h 04mMultiple Airlines

Deal found 9/10

$141

Thu 10/232:00 pmYYZ - DEN

2 stops15h 59mMultiple Airlines

Deal found 9/10

$143

Fri 10/34:00 pmYYZ - DEN

1 stop18h 54mMultiple Airlines

Deal found 9/10

$149

Wed 12/1012:30 pmYYZ - DEN

2 stops17h 28mMultiple Airlines

Deal found 9/10

$150

Sun 10/1210:25 pmYYZ - DEN

1 stop14h 59mWestJet

Deal found 9/9

$155

Sat 10/1110:25 pmYYZ - DEN

1 stop14h 59mWestJet

Deal found 9/9

$156

Sun 10/125:10 pmYTZ - DEN

2 stops20h 14mMultiple Airlines

Deal found 9/9

$162

Sat 10/185:25 pmYOW - DEN

1 stop15h 17mUnited Airlines

Deal found 9/10

$163

Fly from

Fly to

Route

Depart

Return

Price

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Wed 10/15

5:50 pm-11:15 pm

1 stop7h 25m

Denver Intl

Sat 10/25

7:48 am-5:06 pm

1 stop7h 18m

$268

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 3/3

7:45 am-5:44 pm

1 stop11h 59m

Denver Intl

Wed 3/4

11:15 am-7:22 pm

1 stop6h 07m

$311

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 9/21

10:25 pm-11:24 am

1 stop14h 59m

Denver Intl

Mon 9/29

12:15 pm-10:52 pm

1 stop8h 37m

$323

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Sat 10/25

1:35 pm-8:30 pm

1 stop8h 55m

Denver Intl

Wed 10/29

7:40 am-8:00 pm

1 stop10h 20m

$325

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Thu 1/29

8:30 am-10:23 am

Nonstop3h 53m

Denver Intl

Mon 2/2

5:30 pm-10:41 pm

Nonstop3h 11m

$327

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Fri 10/17

1:35 pm-8:30 pm

1 stop8h 55m

Denver Intl

Mon 10/20

6:38 am-5:53 pm

1 stop9h 15m

$329

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Wed 10/1

1:35 pm-3:00 pm

1 stop27h 25m

Denver Intl

Mon 10/6

8:30 pm-12:17 pm

1 stop13h 47m

$330

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Fri 10/17

5:25 pm-6:42 am

1 stop15h 17m

Denver Intl

Mon 10/20

11:59 pm-1:09 pm

2 stops11h 10m

$333

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Sat 10/4

1:35 pm-8:29 pm

1 stop8h 54m

Denver Intl

Sat 10/11

8:22 pm-12:17 pm

1 stop13h 55m

$335

TorontoDenver

YTZ - DEN

YTZDEN

Toronto Island

Tue 3/3

10:25 am-7:55 pm

2 stops11h 30m

Denver Intl

Wed 3/4

11:15 am-9:28 pm

2 stops8h 13m

$338

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 60 results

...

Best time to book a flight from Ontario to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Ontario 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 Ontario to Denver

What is the cheapest month to book a flight from Region of Ontario to Denver?

Currently, October is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $197). Flying from Region of Ontario to Denver in March is currently the most expensive (average of $278). 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 ON to DEN?

When flying from Region of Ontario to Denver, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Region of Ontario to Denver

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

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

Related info for your journey

What airport do you fly into for flights to Denver from Ontario?
For a flight from Ontario to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.
How long is the flight from Region of Ontario to Denver?
For as low as $268, United Airlines can have you in Denver from Region of Ontario in 7h 25m. The distance between Region of Ontario and Denver is about 1513 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the most popular routes from Region of Ontario to Denver?
While some choose either Montreal Pierre Elliott Trudeau Intl - Denver Intl or Ottawa - Denver Intl, Toronto Pearson Intl - Denver Intl is the most popular route from Region of Ontario to Denver.
What are the most reliable airlines from Region of Ontario to Denver?
The top 3 most reliable airlines when flying from Region of Ontario to Denver are Air Canada (57%), United Airlines (57%) and Austrian Airlines (27%).
What are the cheapest flights from Region of Ontario to Denver?
Looking for the cheapest flight from Region of Ontario to Denver? While on average our users pay $1,051, our data indicates the cheapest price to be $204. The most popular route (Toronto Pearson Intl - Denver Intl), is priced around $232.
Can I find deals for flights from Ontario to Denver that include hotel bookings?
Yes. In addition to deals on Ontario to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to Denver?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Denver.
Can I find deals for business class flights from Ontario to Denver?
Yes. Cheapflights offers flight deals from Ontario to Denver 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 Region of Ontario to Denver?
Currently, October is the cheapest month in which you can book a flight from Region of Ontario to Denver (average of $197). Flying from Region of Ontario to Denver in March is currently the most expensive (average of $278). 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

Westminster

Black Hawk

Golden

Winter Park

Broomfield

Greeley

Lone Tree

Lakewood

Cripple Creek

Thornton

Silverthorne

Frisco

Manitou Springs

Fort Morgan

Glendale

Wheat Ridge

Brighton

Longmont

Idaho Springs

Parker

Browse thousands of different options on Cheapflights for your next trip

Top 2 airlines flying from Ontario to Denver

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$254	Average$443	FlexibilityNo cancel fee	On-time67%
United Airlines	Cheapest$384	Average$590	FlexibilityNo cancel fee	On-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$128+ Cheap flights from Ontario to Denver (DEN)

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Denver with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Ontario to Denver

Keep the following information in mind while searching for Ontario to Denver flight deals. Data was last updated September 11, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Ontario to Denver

Cheapest flights from Ontario to DenverExplore the most affordable flight options available from Ontario to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Explore the most affordable flight options available from Ontario to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Denver that are best for you.

Best time to book a flight from Ontario to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Denver

What is the cheapest month to book a flight from Region of Ontario to Denver?

What is the cheapest time of day to fly from ON to DEN?

Find hourly flight availability from Ontario to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Weekly flight availability from Region of Ontario to Denver

Explore weekly flight availability from Ontario to Denver. 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 September 11, 2025.

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

Related info for your journey

Find useful and relevant information for your journey from Ontario to Denver. 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 into for flights to Denver from Ontario?

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

What are the most popular routes from Region of Ontario to Denver?

What are the most reliable airlines from Region of Ontario to Denver?

What are the cheapest flights from Region of Ontario to Denver?

Can I find deals for flights from Ontario to Denver that include hotel bookings?

How can I find direct flights from Ontario to Denver?

Can I find deals for business class flights from Ontario to Denver?

What is the cheapest month to book a flight from Region of Ontario to Denver?

Traveling to a place near Denver?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Denver

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Ontario to Denver

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Ontario to Denver
Explore the most affordable flight options available from Ontario to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.