How long does a flight from Ontario to Denver take?

The duration of a direct flight to Denver from Ontario is typically 2h 22m . The journey crosses a distance of 817 miles.

How many flights are there between Ontario and Denver per day?

Each day, there are between 7 and 8 direct flights that take off from Ontario and land in Denver, with an average flight time of 2h 14m. The most common departure time is 06:00 and most flights take off in the morning. Each week, there are 53 flights. The most frequent day of departure is Monday, when 15% of all weekly flights depart. The fewest flights depart on a Tuesday.

What is the cheapest flight from Ontario to Denver?

In the last 5 days, the lowest price for a flight from Ontario to Denver was £60 for a one-way ticket and £85 for a return.

Which airlines fly most frequently between Ontario and Denver?

Southwest connects Ontario to Denver with 25 flights per week. Frontier also offers 14 flights per week, while United Airlines follows with 14 flights per week.

Which airports will I be using when flying from Ontario to Denver?

Ontario and Denver are both served by 1 main airport. You will leave Ontario from Ontario and will be arriving at Denver Intl.

What’s the earliest departure time from Ontario to Denver?

Early birds can take the earliest flight from Ontario at 05:00 and will be landing in Denver at 08:17.

What’s the latest departure time from Ontario to Denver?

If you prefer to fly at night, the latest flight from Ontario to Denver jets off at 17:40 and lands at 20:50.

Which airlines offer Wi-Fi service onboard planes from Ontario to Denver?

Delta, Alaska Airlines, American Airlines, and JetBlue offer inflight Wi-Fi service on the Ontario to Denver flight route.

Which aircraft models fly most regularly from Ontario to Denver?

The Airbus A320neo is the aircraft model that flies most regularly on the Ontario to Denver flight route.

On which days can I fly direct from Ontario to Denver?

There are direct flights from Ontario to Denver on a daily basis.

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

The cheapest month for flights from Ontario to Denver is February , where tickets cost £124 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £244 and £235 respectively.

How does KAYAK find such low prices on flights from Ontario to Denver?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Denver.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Denver?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Ontario to Denver?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Denver with an airline and back to Ontario with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Denver?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Which cabin class options are there for flights between Ontario and Denver?

There is only one cabin class option available for the route, which is Economy . Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Which airlines provide the cheapest flights from Ontario to Denver?

In the past 5 days, the cheapest return tickets from Ontario to Denver were found on Frontier (£85) and Southwest (£119).

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

To get a below average price on the flight from Ontario to Denver, you should book around 2 weeks before departure , which saves you about 21% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

How much is a return flight from Ontario to Denver?

Flight prices are below average for this route right now. Flights to Denver from Ontario usually cost between £107 and £232 in October. The lowest price found in the past 5 days was £85 on Frontier (24 Oct–27 Oct).

£60 CHEAP FLIGHTS from Ontario to Denver (ONT - DEN)

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Cheapest return fare

£85

Typical prices: £107-£232

Frontier

Sat 24/10Tue 27/10

ONT - DEN • 1 stop

Cheapest direct flights

£89

Typical prices: £98-£240

Frontier

Sat 24/10Tue 27/10

ONT - DEN • Direct

Direct flights

Every day

You can fly direct with Frontier, Southwest, and United Airlines. Average duration is 2h 14m

Direct flights

When to book

2 weeks

in advance

Our data shows that travellers who book at least 2 weeks in advance save around 21% compared to booking last minute.

Insights

When to travel

February

Cheapest • 30% price drop

December

Most popular

Good to know

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We hope you love your trip to Denver!

Flight Deals

Cheap Flights from Ontario to Denver (ONT-DEN)

Discover the best prices for you by selecting your travel dates on KAYAK.

Return

One-way

Last minute

Direct

Recent return flight deals from Ontario to Denver

Sat, 24 Oct - Tue, 27 Oct

17:25 - 23:43ONT Ontario-DEN Denver Intl

5h 18m1 stop Las Vegas Harry Reid Intl

22:29 - 23:51DEN Denver Intl-ONT Ontario

2h 22mdirect

£85Frontier

Sat, 24 Oct - Tue, 27 Oct

17:25 - 23:43ONT Ontario-DEN Denver Intl

5h 18m1 stop Las Vegas Harry Reid Intl

22:29 - 23:51DEN Denver Intl-ONT Ontario

2h 22mdirect

£86Frontier

Sat, 24 Oct - Tue, 27 Oct

06:15 - 09:41ONT Ontario-DEN Denver Intl

2h 26mdirect

22:29 - 23:51DEN Denver Intl-ONT Ontario

2h 22mdirect

£89Frontier

Tue, 27 Oct - Tue, 3 Nov

10:25 - 13:35ONT Ontario-DEN Denver Intl

2h 10mdirect

13:15 - 14:40DEN Denver Intl-ONT Ontario

2h 25mdirect

£119Southwest

Sat, 24 Oct - Tue, 27 Oct

17:25 - 23:43ONT Ontario-DEN Denver Intl

5h 18m1 stop Las Vegas Harry Reid Intl

13:05 - 16:21DEN Denver Intl-ONT Ontario

4h 16m1 stop Las Vegas Harry Reid Intl

£120Frontier

Thu, 29 Oct - Thu, 5 Nov

16:15 - 21:00ONT Ontario-DEN Denver Intl

3h 45m1 stop Phoenix Sky Harbor Intl

21:20 - 22:45DEN Denver Intl-ONT Ontario

2h 25mdirect

£123Southwest

Tue, 27 Oct - Tue, 3 Nov

08:25 - 13:35ONT Ontario-DEN Denver Intl

4h 10m1 stop Las Vegas Harry Reid Intl

20:15 - 21:40DEN Denver Intl-ONT Ontario

2h 25mdirect

£126Southwest

Tue, 27 Oct - Tue, 3 Nov

06:10 - 13:15ONT Ontario-DEN Denver Intl

6h 05m2 stops Phoenix Sky Harbor Intl Salt Lake City

20:15 - 21:40DEN Denver Intl-ONT Ontario

2h 25mdirect

£130Southwest

Thu, 7 Jan - Mon, 11 Jan

07:10 - 14:07ONT Ontario-DEN Denver Intl

5h 57m1 stop Portland

14:55 - 20:02DEN Denver Intl-ONT Ontario

6h 07m1 stop Portland

£134Alaska Airlines

Thu, 17 Dec - Tue, 22 Dec

05:00 - 08:21ONT Ontario-DEN Denver Intl

2h 21mdirect

19:35 - 21:00DEN Denver Intl-ONT Ontario

2h 25mdirect

£137United Airlines

Recent last minute flight deals from Ontario to Denver

Tue, 6 Oct - Tue, 3 Nov

08:25 - 15:15ONT Ontario-DEN Denver Intl

5h 50m2 stops Las Vegas Harry Reid Intl Fresno Airterminal

08:50 - 14:30DEN Denver Intl-ONT Ontario

6h 40m2 stops Reno Las Vegas Harry Reid Intl

£423Southwest

Mon, 5 Oct - Thu, 8 Oct

16:29 - 21:59ONT Ontario-DEN Denver Intl

4h 30m1 stop Phoenix Sky Harbor Intl

15:45 - 18:43DEN Denver Intl-ONT Ontario

3h 58m1 stop Phoenix Sky Harbor Intl

£569American Airlines

Thu, 8 Oct - Wed, 14 Oct

10:35 - 17:45ONT Ontario-DEN Denver Intl

6h 10m2 stops Oakland Santa Ana J. Wayne/Orange Cnty

14:55 - 21:20DEN Denver Intl-ONT Ontario

7h 25m2 stops Portland Oakland

£584Southwest

Thu, 8 Oct - Mon, 12 Oct

10:35 - 17:45ONT Ontario-DEN Denver Intl

6h 10m2 stops Oakland Santa Ana J. Wayne/Orange Cnty

14:55 - 20:20DEN Denver Intl-ONT Ontario

6h 25m2 stops Los Angeles Sacramento Intl

£587Southwest

Tue, 6 Oct - Tue, 6 Oct

05:00 - 08:21ONT Ontario-DEN Denver Intl

2h 21mdirect

11:29 - 20:31DEN Denver Intl-ONT Ontario

10h 02m2 stops Phoenix Sky Harbor Intl San Francisco

£600United Airlines

Wed, 7 Oct - Sat, 10 Oct

14:13 - 22:37ONT Ontario-DEN Denver Intl

7h 24m1 stop Seattle/Tacoma Intl

07:07 - 16:02DEN Denver Intl-ONT Ontario

9h 55m2 stops Seattle/Tacoma Intl Boise Air Term. Gowen Fld

£603Alaska Airlines

Thu, 8 Oct - Thu, 8 Oct

05:00 - 08:21ONT Ontario-DEN Denver Intl

2h 21mdirect

11:26 - 12:46DEN Denver Intl-ONT Ontario

2h 20mdirect

£634United Airlines

Thu, 8 Oct - Sun, 11 Oct

05:00 - 08:21ONT Ontario-DEN Denver Intl

2h 21mdirect

19:35 - 20:58DEN Denver Intl-ONT Ontario

2h 23mdirect

£637United Airlines

Thu, 8 Oct - Tue, 13 Oct

11:29 - 18:15ONT Ontario-DEN Denver Intl

5h 46m1 stop Portland

18:59 - 17:05DEN Denver Intl-ONT Ontario

23h 06m2 stops San Diego Santa Rosa Sonoma County

£640Alaska Airlines

Thu, 8 Oct - Thu, 8 Oct

05:00 - 08:21ONT Ontario-DEN Denver Intl

2h 21mdirect

09:35 - 15:22DEN Denver Intl-ONT Ontario

6h 47m1 stop San Francisco

£640United Airlines

Booking Insights

KAYAK’s insights & trends for Ontario to Denver flights

Get data-powered insights and trends into flights from Ontario to Denver to help you find the cheapest flights, the best time to fly and much more.

Prices

Airlines

How much is a return flight from Ontario to Denver? This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Denver departing in October.
What is the cheapest month to fly from Ontario to Denver? To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.: The cheapest month for flights from Ontario to Denver is February, where tickets cost £124 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £244 and £235 respectively.
How far in advance should I book a flight from Ontario to Denver? To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.: To get a below average price on the flight from Ontario to Denver, you should book around 2 weeks before departure, which saves you about 21% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Find deals

Expert advice

Our travel experts

Stefanie Waldek

Expert on Air Canada, Frontier and United Airlines

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or out at sea, likely en route to Antarctica or the Arctic.

Low season	January
High season	December
Cheapest flight	£60

Best time to beat the crowds (29% less expensive on average)

Most popular time to fly and prices are also 5% lower on average.

Flight from Ontario to Denver

When to book flights from Ontario to Denver

Are your dates flexible? Find out the best times to travel from Ontario to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated return price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

What is the cheapest flight from Ontario to Denver?
In the last 5 days, the lowest price for a flight from Ontario to Denver was £60 for a one-way ticket and £85 for a return.
Which airports will I be using when flying from Ontario to Denver?
Ontario and Denver are both served by 1 main airport. You will leave Ontario from Ontario and will be arriving at Denver Intl.
Which airlines offer Wi-Fi service onboard planes from Ontario to Denver?
Delta, Alaska Airlines, American Airlines, and JetBlue offer inflight Wi-Fi service on the Ontario to Denver flight route.
Which aircraft models fly most regularly from Ontario to Denver?
The Airbus A320neo is the aircraft model that flies most regularly on the Ontario to Denver flight route.
On which days can I fly direct from Ontario to Denver?
There are direct flights from Ontario to Denver on a daily basis.
How does KAYAK find such low prices on flights from Ontario to Denver?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Denver.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Denver?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Ontario to Denver?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Denver with an airline and back to Ontario with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Denver?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Direct departures

Ontario to Denver Intl

Monday