$189 Find Cheap Flights from Ontario to Colorado

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Colorado departing on 7/9. 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, 0 bags

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Good to know

Low seasonJanuary
Cheapest flight$189
Best time to beat the crowds but there is an average 37% increase in price.
Most popular time to fly and prices are also 18% lower on average.
Flight from Toronto Pearson Airport to Denver

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

Insights shared by verified travelers who flew the route from Ontario to Colorado 
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 Colorado

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

    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 Colorado.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Colorado 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 Colorado?

    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 Ontario to Colorado 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 Ontario to Colorado?

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

  • Which airlines fly most frequently to Colorado?

    Air Canada connects Ontario to Colorado with 31 flights per week. United Airlines also offers 31 flights per week, while Austrian Airlines follows with 7 flights per week.

  • How many airports are there in Colorado?

    There are 13 airports in Colorado. The busiest airport is Denver Airport (DEN), with 90% of all flights arriving there.

  • Which is the cheapest airport to fly into in Colorado?

    Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in Colorado is Denver Intl Airport (DEN), with an average flight price of $335.

  • What is the cheapest day to fly to Colorado?

    Based on KAYAK data, the cheapest day to fly to Colorado is Friday where round-trip tickets can be as cheap as $492. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $653 on average.

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

    The cheapest time of day to fly to Colorado is generally in the afternoon, when round-trip flights cost $526 on average. Morning departures are around 4% cheaper than evening flights, on average. The most expensive time of day to fly to Colorado is generally in the evening, which is peak travel time and where the average cost of a ticket is $569.

  • What is the cheapest flight to Colorado?

    The cheapest ticket to Colorado from Ontario found in the last 5 days was to Denver, at $335 round-trip. The most popular route is Toronto Pearson Intl Airport (YYZ) to Denver (DEN) and the cheapest round-trip airline ticket found on this route in the last 5 days was $335.

  • What is the cheapest month to fly from Ontario to Colorado?

    The cheapest month for flights from Ontario to Colorado is October, when tickets cost $407 (return) on average. On the other hand, the most expensive months are January and December, when the average cost of round-trip tickets is $594 and $524 respectively.

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

    To get a below average price on the flight from Ontario to Colorado, you should book around 4 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

  • How many cities have direct flights to Colorado?

    From Ontario, there are direct flights to Colorado from 1 city. This city is Toronto and there are 73 direct flights each week.

  • How many direct flights to Colorado are there each day?

    There are around 11 direct flights from within Ontario to Colorado every day. Most flights (47%) depart in the morning.

  • How many direct flights to Colorado are there each week?

    Each week there are around 73 direct flights from within Ontario to Colorado. The most common day for departures is Saturday, with 16% of flights taking off on this day.

  • How long is the flight to Colorado?

    An average nonstop flight from Ontario to Colorado takes 10h 25m, covering a distance of 1435 miles. The shortest route is Toronto Pearson Intl Airport (YYZ) to Denver (DEN) with an average flight time of 3h 38m.

  • How many long-haul flights are there to Colorado each week?

    There are not any long-haul (6-12 hour flight duration) or medium-haul (3-6 hour flight duration) flights to Colorado. Instead, there are 73 short-haul flights (up to 3 hour flight duration), with the most arriving from Toronto.

  • What are the most popular destinations in Colorado?

    Based on KAYAK flight searches, the most popular destination is Denver (96% of total searches to Colorado). The next most popular destinations are Colorado Springs (3%) and Vail (0%). Searches for flights to Aspen (0%) and to Grand Junction (0%) are also popular.

Reviews of the top airlines flying from Ontario to Colorado

 
Need help choosing which airline to fly with from Ontario to Colorado? 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.
7.4
United AirlinesOverall score based on 9771 reviews
7.1Entertainment
8.1Crew
6.6Food
7.7Boarding
7.3Comfort
Airline reviews

Seats very comfortable; service efficient and pleasant; flight was on-time; boarding organized.

10.0 ExcellentEirene, May 2026
YYZ - EWR
Read more United Airlines reviews

Seats very comfortable; service efficient and pleasant; flight was on-time; boarding organized.

Starlink is great Crew was polite Business class didn’t get a welcome drink just water and snacks were ok

very average service no complimentary alcoholics drinks unlike other airlines such as Porter airlines No decent seats available during check-in time the day before

They were fast and I like how they used to entertainment system to play video about the safety.

Hopped on time for the flight only to get deplaned and delayed another 2.5 hours.

Flight attendants had a little attitude. Food tastes no good.

Very poor. The flight was delayed from Toronto because some forget to do there job . I got to my connecting gate in San Francisco 10 minutes before the departure.but this didn’t let me board even though the flight was still there for an other 30 minutes. The the gentleman at the unite airline desk told me that they usually wait for passengers but air Canada called and told them not to we I been rerouted to Manila instead of Hong Kong . In San Francisco they mad me check in my carryon bag . I was told the it will directly go yo ho chi minn cuyt but I was told that by the Vietnams airline desk that’s not there I’m 10 hours behind my scheduled flight and looks like I I’m going without baggage. I don’t have a chance of catching ..

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

l really enjoy very much the flight was very pleasant

Quick and seamless boarding. No entertainment but fast Starlink wifi for this short trip and the staff was really friendly.

Meal and drink service was good. Old plane with old business class seats were quite disappointing

Another good flight experience with Air Canada. The business section did not feature the full length sleeping arrangement, but this was a shorter trip. The food was excellent. But the flight crew was truly top tier: friendly, cheerful, helpful at all the right times. Air Canada truly outshines all U.S. carriers.

Flight itself was not bad at all. However: my checked bag (checked in Calgary) did not make it onto this flight as I found out after I landed at EWR. I still don't have it but it appears that it is on its way to me.

Flight and attendance were very good we had 2 hour delay that took the shine of it

The seat design in the premium economy section leaves virtually no room under the seat to store a bag or purse. Other than that, it was a great flight. Arrived early.

The flight was delayed, but not for weather. We landed over 3hrs later than planned.

The stag were helpful, kind and liked the passengers. The plane was pristinely clean! Great flight!

My flight was delayed more than once, but Air Canada updated us regularly. Friends on other airlines had much worse experiences.

Terrible…. Reported missing luggage’s with injectable meds that needed refrigeration. Yet, delivery could not be expedited. Luggage’s were delivered 5 days after arrival. The meds were useless as ice pack had melted. So disappointed!!!

My seat was covered in vomit and I will be reaching out to Air Canada

Everything you need to know for your flight to Colorado

Cabin class types available on flights to Ontario

Cabin classes available on flights to Ontario. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.