$156 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 9/16. 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

Sat, Oct 10 - Mon, Oct 12
WestJet Logo
5:20 pm - 11:20 am
YYZ
-
DEN
20h 00m
2 stops
WestJet Logo
12:15 pm - 12:10 am
DEN
-
YYZ
9h 55m
1 stop
$362WestJet
Thu, Aug 13 - Wed, Aug 19
Multiple Airlines Logo
12:55 pm - 9:09 pm
YYZ
-
DEN
10h 14m
1 stop
Multiple Airlines Logo
12:15 pm - 10:45 pm
DEN
-
YYZ
8h 30m
1 stop
$366Multiple Airlines
Thu, Aug 13 - Wed, Aug 19
Multiple Airlines Logo
6:40 pm - 8:22 pm
YYZ
-
DEN
3h 42mnonstop
Multiple Airlines Logo
12:15 pm - 10:45 pm
DEN
-
YYZ
8h 30m
1 stop
$368Multiple Airlines
Thu, Aug 13 - Sun, Aug 23
Multiple Airlines Logo
6:30 am - 11:58 pm
YYZ
-
DEN
19h 28m
2 stops
Multiple Airlines Logo
12:15 pm - 10:45 pm
DEN
-
YYZ
8h 30m
1 stop
$369Multiple Airlines
Tue, Aug 4 - Tue, Aug 11
WestJet Logo
8:40 pm - 11:20 am
YKF
-
DEN
16h 40m
1 stop
WestJet Logo
12:15 pm - 7:50 pm
DEN
-
YKF
29h 35m
1 stop
$374WestJet
Sun, Aug 2 - Sun, Aug 23
WestJet Logo
8:40 pm - 11:20 am
YKF
-
DEN
16h 40m
1 stop
WestJet Logo
12:15 pm - 7:50 pm
DEN
-
YKF
29h 35m
1 stop
$375WestJet
Tue, Aug 11 - Tue, Aug 18
Multiple Airlines Logo
12:55 pm - 9:09 pm
YYZ
-
DEN
10h 14m
1 stop
Multiple Airlines Logo
9:15 am - 1:05 am
DEN
-
YYZ
13h 50m
2 stops
$375Multiple Airlines
Tue, Sep 1 - Fri, Sep 4
WestJet Logo
10:25 pm - 11:20 am
YYZ
-
DEN
14h 55m
1 stop
WestJet Logo
12:15 pm - 10:45 pm
DEN
-
YYZ
8h 30m
1 stop
$376WestJet
Tue, Aug 11 - Tue, Aug 18
Multiple Airlines Logo
12:55 pm - 7:49 am
YYZ
-
DEN
20h 54m
1 stop
Multiple Airlines Logo
9:15 am - 1:05 am
DEN
-
YYZ
13h 50m
2 stops
$377Multiple Airlines
Wed, Aug 26 - Mon, Aug 31
Air Canada Logo
12:30 pm - 7:00 pm
YTZ
-
DEN
8h 30m
1 stop
Air Canada Logo
11:25 am - 9:31 pm
DEN
-
YTZ
8h 06m
1 stop
$404Air Canada
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Good to know

Low season

January
Best time to beat the crowds but there is an average 31% 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
YYZ
-
DEN
Aug 2024
Make sure to check the airline delay flights rate and if you have important commitments choose another airline.
JoshuaFlew with Air Canada
YYZ
-
DEN
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.

Everything you need to know for your flight to Denver

Information on the airport you'll fly into in Denver

Denver (DEN)