$152 Find Cheap Flights from Ontario to Denver - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Denver departing on 9/15. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from Ontario to Denver

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Denver

Thu, Sep 10 - Thu, Sep 17
WestJet Logo
8:00 pm - 11:20 amYUL  Montreal Pierre Elliott Trudeau Intl-DEN Denver Intl
17h 20m1 stop Calgary
WestJet Logo
12:15 pm - 7:05 amDEN  Denver Intl-YUL Montreal Pierre Elliott Trudeau Intl
16h 50m1 stop Calgary
$318WestJet
Thu, Sep 24 - Thu, Oct 1
WestJet Logo
4:15 pm - 11:20 amYOW  Ottawa-DEN Denver Intl
21h 05m1 stop Calgary
WestJet Logo
12:15 pm - 5:35 amDEN  Denver Intl-YOW Ottawa
15h 20m1 stop Calgary
$355WestJet
Fri, Sep 18 - Tue, Sep 22
Multiple Airlines Logo
7:00 am - 3:37 pmYOW  Ottawa-DEN Denver Intl
10h 37m1 stop Orlando
Multiple Airlines Logo
10:47 pm - 7:20 pmDEN  Denver Intl-YOW Ottawa
18h 33m2 stops Phoenix Sky Harbor Intl Calgary
$380Multiple Airlines
Sat, Sep 19 - Tue, Sep 22
Multiple Airlines Logo
4:15 pm - 11:20 amYOW  Ottawa-DEN Denver Intl
21h 05m1 stop Calgary
Multiple Airlines Logo
10:47 pm - 7:20 pmDEN  Denver Intl-YOW Ottawa
18h 33m2 stops Phoenix Sky Harbor Intl Calgary
$387Multiple Airlines
Mon, Oct 5 - Sun, Oct 11
Air Canada Logo
8:45 am - 10:22 amYYZ  Toronto Pearson Intl-DEN Denver Intl
3h 37mnonstop
Air Canada Logo
11:25 am - 7:53 pmDEN  Denver Intl-YYZ Toronto Pearson Intl
6h 28m1 stop Montreal Pierre Elliott Trudeau Intl
$415Air Canada
Fri, Sep 4 - Mon, Sep 7
Air Canada Logo
8:55 am - 10:35 amYYZ  Toronto Pearson Intl-DEN Denver Intl
3h 40mnonstop
Air Canada Logo
6:05 pm - 11:17 pmDEN  Denver Intl-YYZ Toronto Pearson Intl
3h 12mnonstop
$415Air Canada
Sat, Sep 5 - Mon, Sep 7
Air Canada Logo
6:40 pm - 8:22 pmYYZ  Toronto Pearson Intl-DEN Denver Intl
3h 42mnonstop
Air Canada Logo
6:05 pm - 11:17 pmDEN  Denver Intl-YYZ Toronto Pearson Intl
3h 12mnonstop
$416Air Canada
Tue, Sep 8 - Thu, Sep 10
United Airlines Logo
4:18 pm - 5:56 pmYYZ  Toronto Pearson Intl-DEN Denver Intl
3h 38mnonstop
United Airlines Logo
1:32 pm - 10:36 pmDEN  Denver Intl-YYZ Toronto Pearson Intl
7h 04m1 stop Houston George Bush Intcntl
$482United Airlines
Sun, Sep 6 - Fri, Sep 11
United Airlines Logo
10:45 am - 12:28 pmYYZ  Toronto Pearson Intl-DEN Denver Intl
3h 43mnonstop
United Airlines Logo
6:00 am - 7:00 pmDEN  Denver Intl-YYZ Toronto Pearson Intl
11h 00m1 stop Newark
$482United Airlines
Sun, Sep 6 - Sun, Sep 13
United Airlines Logo
10:45 am - 12:28 pmYYZ  Toronto Pearson Intl-DEN Denver Intl
3h 43mnonstop
United Airlines Logo
5:00 am - 2:24 pmDEN  Denver Intl-YYZ Toronto Pearson Intl
7h 24m1 stop Houston George Bush Intcntl
$482United Airlines
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Good to know

Low season

January
Best time to beat the crowds but there is an average 28% increase in price.
Most popular time to fly and prices are also 14% lower on average.

Flights from Ontario to Denver: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Ontario to Denver 
Learn how KAYAK collects reviews and tips from users.
F.Flew with United Airlines-Aug 2024
Make sure to check the airline delay flights rate and if you have important commitments choose another airline.
JoshuaFlew with Air Canada-Apr 2024
Toronto's customs was one of the faster experiences I've had. They opened four more lanes to expedite the process when the lane got too long, to ensure we would all get through within around 15 minutes. The public transportation within the city is also top notch, in my opinion.

FAQs for booking flights from Ontario to Denver

  • 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 round-trip 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.

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Westminster
Lakewood
Dillon
Broomfield
Englewood
Greenwood Village
Lone Tree
Central City
Limon
Brighton
Fort Morgan
Wheat Ridge
Evergreen
Erie

Everything you need to know for your flight to Denver

Information on the airport you'll fly into in Denver

Denver (DEN)