$168 Find Cheap Flights from Ontario to Colorado

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Low seasonJanuary
High seasonAugust
Cheapest flight$168
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Ottawa 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 AirlinesYYZ-DENAug 2024
Make sure to check the airline delay flights rate and if you have important commitments choose another airline.
JoshuaFlew with Air CanadaYYZ-DENApr 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 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 $328.

  • 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 $438. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $588 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 $410 on average. Morning departures are around 9% more expensive than evening flights, on average. The most expensive time of day to fly to Colorado is generally in the morning, which is peak travel time and where the average cost of a ticket is $536.

  • What is the cheapest flight to Colorado?

    The cheapest ticket to Colorado from Ontario found in the last 72 hours was to Denver, at $218 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 72 hours was $218.

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

    The cheapest month for flights from Ontario to Colorado is April, when tickets cost $429 (return) on average. On the other hand, the most expensive months are December and February, when the average cost of round-trip tickets is $547 and $516 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. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

  • How long is the flight to Colorado?

    An average nonstop flight from Ontario to Colorado takes 10h 42m, 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 34m.

  • What are the most popular destinations in Colorado?

    Based on KAYAK flight searches, the most popular destination is Denver (95% of total searches to Colorado). The next most popular destinations are Colorado Springs (4%) and Aspen (0%). Searches for flights to Vail (0%) and to Grand Junction (0%) are also popular.

Reviews of the top 3 airlines serving 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 8856 reviews
7.0Entertainment
7.7Boarding
7.3Comfort
8.1Crew
6.6Food
Airline reviews

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

10.0 ExcellentAnonymous, Jul 2025YYZ - SFO
Read more United Airlines reviews

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

Very rough getting into denver. my kid threw up it was so rough.

Why wasn't this flight departure scheduled eith another crew so that it could leave on time? When we arrived in Denver we had so little time between flights we had run to the connecting flight. We should received some credit for the inconvenience.

Efficient, calm when things were delayed and kept us regularly informed of what was happening.

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

Our flight info was lost as the original booking was with westjet... almost missed our outbound flight trying to get it corrected. Inbound we had to reschedule completely as they didn't have our information and resold our seats ending up getting home much later than planned. The confirmation numbers we received from justfly for westjet didn't help anything with delta as they said we needed a delta confirmation which we never received. I talked with justfly and they said it's the airlines problem and with westjet and they said it is the 3rd party bookers issue.... so, not fun

They kept making changes to the itinerary. I actually wasn't able to go and i tried to get flight credit in exchange for the ticket, but the customer service chat was taking way too much time.

Generally good. However. The flight left 30 mins behind schedule with no reason given.

Flight delayed, missed my pick-up had to Uber, plus missed dinner and medication, so sad!

WestJet canceled my booking, replaced it with a booking that didn't work (departing from cruise ship), and didn't offer any flights that did work. Their only option was for me to cancel and go to another airline for more money. Which I did.

Nothing to like because my inbound flight was cancelled without notification by West Jet or third party, JustFly. I couldn’t take the inbound flight due to cancellation; therefore could not take the outbound flight back.

The seats are totally uncomfortable making the flight less than pleasant. The cookies & pretzels were terrible!!!

Not the greatest experience everything was pretty mediocre. My seat was by the washroom in the aisle and was not located well as everyone past each other people were right in my seat and space.

The small prop plane was crowded and the overhead luggage storage is a smaller than on the jets. Other than that, the crew was good, the flight was on time and the landing was smooth.

There was a medical emergency that the crew handled very well. There was no “entertainment” of any sort-no movie/music/whatever. Food was typical of airlines: mediocre.

In a nutshell, my bag, the one I have to pay for, because now you can’t even bring a carry on, did not make it. I am still waiting for an update. The fact that not only were have to pay for it, but on top of that we are stuck without getting it, it’s ridiculous..

This was an excellent experience for a very short flight.

No space in overhead bin, one cookie, 2 oz of juice - is not customer service.

Somebody either kayak or Air Canada booked my flight under my preferred name Betty instead of my legal name and I almost was denied boarding my flight

flight landed late almost 1.00hr and we 4 passengers missed our connected flight to indianapolis, we need to get the hotel and taxi for the next day flight to home in indianapolis, cost us $ 300 more

The ground staff was so rude in Toronto airport ...very rude and did not answer simple questions, and made me look like a fool. Very rude ground staff.

My flight got delayed 5 times and then got cancelled eventually, I had to get a hotel and uber and pay for food for an extra night without any plans. It was a horrible experience, instead of Air Canada, I was flying with United .

I had a nice flight with free wifi. So I was able to message family members and stream music during my flight, which made the trip go by fast. I also enjoyed flying on there Airbus A220. The plane looked very new and it also got up to speed fast down the runway and didn't need much runway to get airborne.

Overall good experience. The flight from Toronto to Denver does not have entertainment - movies to watch.

Ensure prepaid food arrangements are appropriately understood by flight crew of who purchased and who did not

Book cheap flights from Ontario to Colorado

Recent round-trip flight deals

8/26Tue
1 stopWestJet
19h 57mYUL-DEN
9/2Tue
1 stopWestJet
10h 26mDEN-YUL
$262
8/2Sat
nonstopAir Canada
4h 16mYUL-DEN
8/8Fri
nonstopAir Canada
3h 46mDEN-YUL
$265
8/8Fri
nonstopAir Canada
4h 16mYUL-DEN
8/14Thu
nonstopAir Canada
3h 46mDEN-YUL
$266
8/28Thu
1 stopWestJet
30h 27mYUL-DEN
8/31Sun
1 stopWestJet
10h 28mDEN-YUL
$277
8/6Wed
1 stopUnited Airlines
15h 37mYUL-DEN
8/13Wed
1 stopUnited Airlines
8h 07mDEN-YUL
$310
8/9Sat
1 stopUnited Airlines
7h 39mYOW-DEN
8/14Thu
1 stopUnited Airlines
8h 40mDEN-YOW
$314
8/8Fri
1 stopAmerican Airlines
8h 31mYUL-DEN
8/12Tue
2 stopsAmerican Airlines
8h 32mDEN-YUL
$318
8/8Fri
2 stopsAmerican Airlines
11h 24mYUL-DEN
8/12Tue
2 stopsAmerican Airlines
9h 42mDEN-YUL
$323
8/20Wed
1 stopDelta
7h 06mYYZ-DEN
8/22Fri
1 stopDelta
7h 24mDEN-YYZ
$337
7/26Sat
2 stopsDelta
17h 58mYYZ-COS
7/29Tue
1 stopDelta
5h 40mCOS-YYZ
$344

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Recent one-way flight deals

8/27Wed
1 stopAir Canada
6h 21mYOW-DEN
$168
8/12Tue
nonstopAir Canada
4h 15mYUL-DEN
$169
9/9Tue
1 stop
19h 32mYTZ-DEN
$179
8/26Tue
1 stopWestJet
19h 57mYUL-DEN
$182
9/9Tue
2 stops
15h 00mYYZ-DEN
$182
8/2Sat
1 stopUnited Airlines
17h 15mYUL-DEN
$184
8/26Tue
2 stopsUnited Airlines
12h 37mYUL-DEN
$185
8/10Sun
1 stopWestJet
17h 27mYYZ-DEN
$186
8/27Wed
2 stopsAmerican Airlines
9h 54mYUL-DEN
$194
8/8Fri
1 stopAmerican Airlines
12h 58mYYZ-DEN
$202

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Last minute flights from Ontario to Colorado

Last minute flight, train and bus deals

7/19Sat
multi-stopUnited Airlines
7h 39mYOW-DEN
7/27Sun
multi-stopUnited Airlines
7h 17mDEN-YOW
$314
7/18Fri
multi-stopDelta
7h 55mYYZ-DEN
7/25Fri
multi-stopDelta
8h 39mDEN-YYZ
$443
7/19Sat
multi-stop
10h 38mYTZ-DEN
7/24Thu
multi-stop
24h 36mDEN-YTZ
$464
7/19Sat
multi-stop
10h 38mYTZ-DEN
7/23Wed
multi-stop
17h 19mDEN-YTZ
$528
7/17Thu
multi-stopAmerican Airlines
8h 42mYUL-COS
7/21Mon
multi-stopAmerican Airlines
7h 45mCOS-YUL
$581
7/17Thu
multi-stopAmerican Airlines
11h 52mYUL-COS
7/21Mon
multi-stopAmerican Airlines
7h 45mCOS-YUL
$585
7/19Sat
multi-stopWestJet
31h 32mYOW-DEN
7/27Sun
multi-stopWestJet
10h 26mDEN-YOW
$637
7/19Sat
multi-stopWestJet
18h 12mYOW-DEN
7/27Sun
multi-stopWestJet
10h 26mDEN-YOW
$664
7/18Fri
nonstopAir Canada
3h 40mYYZ-DEN
7/22Tue
nonstopAir Canada
3h 15mDEN-YYZ
$718
7/17Thu
nonstopAir Canada
3h 44mYYZ-DEN
7/20Sun
nonstopAir Canada
3h 13mDEN-YYZ
$727

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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.

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