$137 Find Cheap Flights from Ontario to Denver

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 3/31. 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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Everything you should know

Cheapest round-trip
$343
Overall average: $475
WestJet
Fri 6/19Mon 6/22
YUL - DEN • 1 stop
Cheapest non-stop
$368
Typical prices: $524-$941
Air Canada
Mon 3/16Tue 3/24
YUL - DEN • Non-stop
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Flight Deals
Useful Info
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

Fri, Jun 19 - Mon, Jun 22
WestJet Logo
5:30 pm - 11:20 am
YUL
-
DEN
19h 50m
1 stop
WestJet Logo
12:15 pm - 11:45 pm
DEN
-
YUL
9h 30m
1 stop
$343WestJet
Tue, Jun 9 - Sat, Jun 13
WestJet Logo
7:15 am - 11:20 am
YUL
-
DEN
30h 05m
1 stop
WestJet Logo
12:15 pm - 11:45 pm
DEN
-
YUL
9h 30m
1 stop
$345WestJet
Fri, Jun 19 - Wed, Jul 1
WestJet Logo
8:00 pm - 11:20 am
YUL
-
DEN
17h 20m
1 stop
WestJet Logo
12:15 pm - 11:45 pm
DEN
-
YUL
9h 30m
1 stop
$348WestJet
Fri, Jun 19 - Mon, Jun 22
WestJet Logo
7:20 pm - 11:20 am
YUL
-
DEN
18h 00m
2 stops
WestJet Logo
12:15 pm - 11:45 pm
DEN
-
YUL
9h 30m
1 stop
$349WestJet
Tue, Jul 14 - Wed, Jul 22
WestJet Logo
6:10 pm - 11:20 am
YHM
-
DEN
19h 10m
1 stop
WestJet Logo
12:15 pm - 5:15 pm
DEN
-
YHM
27h 00m
1 stop
$349WestJet
Fri, Jun 19 - Wed, Jul 1
WestJet Logo
7:20 pm - 11:20 am
YUL
-
DEN
18h 00m
2 stops
WestJet Logo
12:15 pm - 11:45 pm
DEN
-
YUL
9h 30m
1 stop
$356WestJet
Fri, Apr 24 - Mon, Apr 27
Multiple Airlines Logo
8:00 am - 12:09 pm
YUL
-
DEN
30h 09m
2 stops
Multiple Airlines Logo
12:15 pm - 11:45 pm
DEN
-
YUL
9h 30m
1 stop
$365Multiple Airlines
Mon, Mar 16 - Tue, Mar 24
Air Canada Logo
5:25 pm - 7:55 pm
YUL
-
DEN
4h 30mnonstop
Air Canada Logo
11:15 am - 4:58 pm
DEN
-
YUL
3h 43mnonstop
$368Air Canada
Tue, Mar 10 - Wed, Mar 11
Air Canada Logo
8:00 am - 5:44 pm
YYZ
-
DEN
11h 44m
1 stop
Air Canada Logo
5:30 pm - 10:41 pm
DEN
-
YYZ
3h 11mnonstop
$378Air Canada
Fri, Feb 27 - Mon, Mar 2
Air Canada Logo
8:30 am - 10:23 am
YYZ
-
DEN
3h 53mnonstop
Air Canada Logo
5:30 pm - 10:41 pm
DEN
-
YYZ
3h 11mnonstop
$381Air Canada
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$137
Best time to beat the crowds but there is an average 36% increase in price.
Most popular time to fly with an average 8% increase in price.
Flight from Toronto Pearson Airport to Denver

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.

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
Wheat Ridge
Limon
Brighton
Fort Morgan
Evergreen
Erie

Everything you need to know for your flight to Denver

Information on the airport you'll fly into in Denver

Denver (DEN)