C$ 135 Find Cheap Flights from Denver to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Ontario departing on 3/9. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Ontario, as well as popular online travel agencies
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Best Ontario Flight Deals from Denver

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Toronto
Toronto1 stopC$ 372
Ottawa
Ottawa1 stopC$ 505
Toronto
Toronto1 stopC$ 372
Ottawa
Ottawa1 stopC$ 505

Cheap Flights from Denver to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to Ontario 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 Denver to Ontario

Thu, 25 Sep - Sat, 27 Sep
WestJet Logo
12:15 p.m. - 10:52 p.m.DEN-YYZ
8h 37m1 stop
WestJet Logo
10:25 p.m. - 11:24 a.m.YYZ-DEN
14h 59m1 stop
C$ 372WestJet
Find Deal
Wed, 3 Sep - Mon, 8 Sep
WestJet Logo
12:15 p.m. - 12:31 a.m.DEN-YYZ
10h 16m2 stops
WestJet Logo
10:25 p.m. - 11:24 a.m.YYZ-DEN
14h 59m1 stop
C$ 375WestJet
Find Deal
Thu, 4 Sep - Sun, 7 Sep
 Logo
12:15 p.m. - 4:36 p.m.DEN-YYZ
26h 21m2 stops
 Logo
10:00 a.m. - 6:48 p.m.YYZ-DEN
10h 48m1 stop
C$ 403
Find Deal
Thu, 4 Sep - Sun, 7 Sep
 Logo
12:15 p.m. - 6:40 a.m.DEN-YYZ
16h 25m1 stop
 Logo
9:40 p.m. - 11:24 a.m.YYZ-DEN
15h 44m1 stop
C$ 404
Find Deal
Mon, 18 Aug - Sun, 24 Aug
Air Canada Logo
9:40 a.m. - 7:46 p.m.DEN-YTZ
8h 06m1 stop
Air Canada Logo
12:25 p.m. - 6:20 p.m.YTZ-DEN
7h 55m1 stop
C$ 439Air Canada
Find Deal
Mon, 18 Aug - Sun, 24 Aug
Air Canada Logo
7:45 a.m. - 12:58 p.m.DEN-YYZ
3h 13mdirect
Air Canada Logo
6:20 p.m. - 8:00 p.m.YYZ-DEN
3h 40mdirect
C$ 457Air Canada
Find Deal
Sat, 13 Sep - Thu, 18 Sep
American Airlines Logo
10:31 a.m. - 10:32 p.m.DEN-YUL
10h 01m2 stops
American Airlines Logo
12:31 p.m. - 4:47 p.m.YUL-DEN
6h 16m1 stop
C$ 556American Airlines
Find Deal
Fri, 5 Sep - Sun, 7 Sep
American Airlines Logo
7:20 a.m. - 10:32 p.m.DEN-YUL
13h 12m2 stops
American Airlines Logo
12:31 p.m. - 7:42 p.m.YUL-DEN
9h 11m2 stops
C$ 563American Airlines
Find Deal
Wed, 10 Sep - Mon, 15 Sep
United Airlines Logo
10:12 a.m. - 6:52 p.m.DEN-YOW
6h 40m1 stop
United Airlines Logo
7:29 p.m. - 11:59 p.m.YOW-DEN
6h 30m1 stop
C$ 663United Airlines
Find Deal
Sat, 13 Sep - Sat, 20 Sep
United Airlines Logo
7:45 a.m. - 3:17 p.m.DEN-YXU
5h 32m1 stop
United Airlines Logo
6:10 a.m. - 10:14 a.m.YXU-DEN
6h 04m1 stop
C$ 783United Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Denver to Ontario flights

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

What is the cheapest Denver to Ontario flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Denver to Ontario.

The cheapest ticket to Ontario from Denver found in the last 72 hours was to Toronto, at C$ 193 round-trip. The most popular route is from Denver (DEN) to Toronto Pearson Intl Airport (YYZ), and the cheapest round-trip airline ticket found on this route in the last 72 hours was C$ 193.

Can I save money by flying with a layover from Denver to Ontario?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at C$ 661 on average.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Ontario, 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 Denver to Ontario is March, when tickets cost C$ 359 (return) on average. On the other hand, the most expensive months are November and August, when the average cost of round-trip tickets is C$ 807 and C$ 764 respectively.

What’s the cheapest day of the week to fly from Denver to Ontario?

The average price of all round-trip flights from Denver to Ontario clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Denver to Ontario, look for departures on Thursdays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from Ontario, Friday is the cheapest day to fly and Monday is the most expensive.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to Ontario, 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 a flight from Denver to Ontario, you should book around 4 weeks before departure, which saves you about 54% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.


Good to know

Low seasonApril
Cheapest flightC$ 135
Best time to beat the crowds but there is an average 11% increase in price.
Most popular time to fly (2% more expensive on average)
Flight from Denver to Toronto Pearson Airport

FAQs - booking Ontario flights

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

    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 Denver to Ontario.

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

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

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

    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 from Denver to Ontario with an airline and back with another airline.

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

    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 from Denver to Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Ontario?

    The cheapest time of day to fly to Ontario is generally in the afternoon, when round-trip flights cost C$ 325 on average. Morning departures are around 35% more expensive than evening flights, on average. The most expensive time of day to fly to Ontario is generally in the morning, which is peak travel time and where the average cost of a ticket is C$ 514.

Top tips for finding cheap flights to Ontario

  • Looking for a cheap flight? 25% of our users found tickets from Denver to the following destinations at these prices or less: Toronto C$ 249 one-way - C$ 546 round-trip

Reviews of the top airline flying from Denver to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Denver to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
Air CanadaOverall score based on 9851 reviews
6.3Food
6.8Entertainment
7.1Comfort
7.3Boarding
7.8Crew
Airline reviews

I booked my flight months ago, and checked-in online about 12 hours before the flight. I received an email confirmation of check-in. I had no subsequent communication from Air Canada after my original booking. After arriving at the airport three hours before the flight, as instructed, I waited 90 minutes for an agent to appear to check my bag. I was informed that my flight had been canceled many weeks before, and that flight was no longer being run!! I showed a copy of my check-in confirmation, but no explanation could be found. I was placed on standby for the next flight and the connection. Luckily, those flights were not full and I arrived at my destination. I double checked my email, but I received no update about the flight from Air Canada until the day of the flight.

2.0 MediocreAnne, Jul 2025MSP - YYZ
Read more Air Canada reviews

I booked my flight months ago, and checked-in online about 12 hours before the flight. I received an email confirmation of check-in. I had no subsequent communication from Air Canada after my original booking. After arriving at the airport three hours before the flight, as instructed, I waited 90 minutes for an agent to appear to check my bag. I was informed that my flight had been canceled many weeks before, and that flight was no longer being run!! I showed a copy of my check-in confirmation, but no explanation could be found. I was placed on standby for the next flight and the connection. Luckily, those flights were not full and I arrived at my destination. I double checked my email, but I received no update about the flight from Air Canada until the day of the flight.

I was forcefully re-routed to another destination and was delayed a total of 8hours. I have still not received my bags, no one is taking responsibility. The agents at the airport lied to me that I will get to my destination same time as my previous flight where I was forcefully re-routed from.

Flight was delayed by 1.5hrs. Once inside, people had their small handbags on the storage. The crew (male guy) was not helpful in making some space in the storage. Instead, he asked few bags to be checked-in and it was not a great experience. No attempt to help but just followed the things with a straight face. People had their literally small bags and he wouldnt not move from one storage to another even if there was space and would not let us do i as well. Once flight was on, they ran out of Orange juice, really running out of orange juice when the temp were 32.degrees outside. didnt made the sense. Onasking for a extra snack, he made a face as if he was giving me out of his pocket. if the flight was delayed, there could have an attempt to provide something extra incase people did asked.

Our flight was canceled at the last minute. Someone on the flight said the exact same thing happened to her the day before. I will say they helped us book a flight on another airline so that we could still make our vacation with little delay.

We had a very long delay. First the inbound flight took a while, then maintenance, they “fixed it” to then do boarding and leave the gate, and waste a lot of time to have to go back to the gate and eventually deplane. Had to wait for a new aircraft, wait for a gate, and do the whole thing again. Instead of leaving at 9:50am we left until past 1. I could’ve not woken up at 5am, or spend some more time with my family if they gave more grace period of time between flights to give some time in case of any issues. But they have to make all and every dollar possible

Abandoned me in hallway in a wheelchair… which I asked for because I sprained my back. After waiting in the hallway, I decided to walk the rest of the way since someone respecting me up.. My experience with the united was totally the opposite. Wheelchair access, propped swift and save me a lot of grief. Air Canada totally disorganized.

Bad experience boarding and flight got delayed didn’t make it to my next flight

The food on the trip Toronto to Athens could be better: the chicken didn’t taste good.

Conflicting information provided about baggage allowance. One screen said I had a carry on and another said I didnt.

Flight was delayed but the real issue is how long we sat after boarding. Space very limited for an overnight flight and seatbacks didn’t recline so it was almost impossible to sleep.

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

Information on your arrival and departure airports

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