$140 Find Cheap Flights from Ontario to Colorado

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Low seasonJanuary
High seasonAugust
Cheapest flight$140
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from Toronto Region of Waterloo Intl 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 $256.

  • 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 $446. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $578 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 $408 on average. Morning departures are around 6% 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 $519.

  • What is the cheapest flight to Colorado?

    The cheapest ticket to Colorado from Ontario found in the last 72 hours was to Denver, at $277 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 $277.

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

    The cheapest month for flights from Ontario to Colorado is September, when tickets cost $426 (return) on average. On the other hand, the most expensive months are December and February, when the average cost of round-trip tickets is $544 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 10 weeks before departure.

  • How long is the flight to Colorado?

    An average nonstop flight from Ontario to Colorado takes 9h 08m, 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 (94% of total searches to Colorado). The next most popular destinations are Colorado Springs (4%) and Aspen (1%). 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 8810 reviews
8.1Crew
7.0Entertainment
7.3Comfort
6.6Food
7.7Boarding
Airline reviews

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

10.0 ExcellentAnonymous, Jun 2025YVR - DEN
Read more United Airlines reviews

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.

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

headphone jack didnt work for the first flight and not much variety

Food choices were very limited. Taste of the dishes was average.

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.

Late departure, so I missed connection in Detroit. But Delta gave me a great hotel & breakfast. Just sorry I could not get anything from my checked baggage.

Crew was friendly. Lost our luggage and told us it’d be in later in the evening of the day we returned. It was not. Still after 5 days have not received it.

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

We never had an experience they canceled the flight and they did not offer us an alternative flight. I had to book one on my own expense. They offered us food voucher and we could not use them at the airport it kept saying not attached to an existing flight. The people at the counter were rude and cold and they did not care about our situation

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Found the seats very crowded—too close together ! And waited a long time for our luggage All staff at both ends were excellent!!!

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

All was fine. Weather was a bit stormy, but nothing kayak can do about that! 😊

I paid for a comfort class seat and was seated in economy.

Book cheap flights from Ontario to Colorado

Recent round-trip flight deals

7/9Wed
1 stopWestJet
26h 27mYYZ-DEN
7/16Wed
1 stopWestJet
8h 39mDEN-YYZ
$246
7/25Fri
1 stopWestJet
23h 57mYYZ-DEN
7/28Mon
1 stopWestJet
10h 09mDEN-YYZ
$248
7/22Tue
1 stopAir Canada
6h 21mYOW-DEN
7/24Thu
1 stopAir Canada
7h 20mDEN-YOW
$255
7/15Tue
1 stopAir Canada
7h 05mYOW-DEN
7/22Tue
1 stopAir Canada
11h 14mDEN-YOW
$262
7/14Mon
1 stopUnited Airlines
7h 01mYOW-DEN
7/21Mon
1 stopUnited Airlines
15h 09mDEN-YOW
$269
8/14Thu
1 stopUnited Airlines
15h 18mYOW-DEN
9/9Tue
1 stopUnited Airlines
7h 59mDEN-YOW
$287
7/9Wed
nonstop
3h 40mYYZ-DEN
7/16Wed
1 stop
8h 39mDEN-YYZ
$293
7/21Mon
2 stops
16h 00mYYZ-DEN
7/30Wed
1 stop
8h 39mDEN-YYZ
$300
7/17Thu
2 stopsAmerican Airlines
17h 52mYYZ-COS
7/28Mon
1 stopAmerican Airlines
15h 55mCOS-YYZ
$346
6/29Sun
1 stopAmerican Airlines
15h 44mYYZ-DEN
7/4Fri
1 stopAmerican Airlines
5h 09mDEN-YYZ
$366

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Recent one-way flight deals

7/10Thu
1 stopWestJet
17h 42mYKF-DEN
$140
7/10Thu
1 stopWestJet
17h 42mYKF-DEN
$144
7/31Thu
1 stopUnited Airlines
7h 31mYOW-DEN
$162
6/24Tue
nonstopAir Canada
3h 40mYYZ-DEN
$173
6/24Tue
1 stopAir Canada
7h 20mYYZ-DEN
$176
7/22Tue
3 stops
19h 00mYYZ-DEN
$182
7/21Mon
2 stops
27h 18mYYZ-DEN
$183
8/2Sat
1 stopUnited Airlines
7h 39mYOW-DEN
$193
8/26Tue
1 stopAmerican Airlines
18h 43mYYZ-COS
$201
7/3Thu
1 stopAmerican Airlines
15h 44mYYZ-DEN
$210

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Last minute flights from Ontario to Colorado

Last minute flight, train and bus deals

6/23Mon
multi-stopUnited Airlines
6h 46mYOW-DEN
6/30Mon
multi-stopUnited Airlines
10h 51mDEN-YOW
$367
6/19Thu
nonstopAir Canada
4h 16mYUL-DEN
6/22Sun
nonstopAir Canada
3h 46mDEN-YUL
$382
6/19Thu
multi-stopAir Canada
9h 20mYYZ-DEN
6/22Sun
multi-stopAir Canada
13h 45mDEN-YYZ
$382
6/19Thu
multi-stopAmerican Airlines
16h 54mYUL-DEN
6/22Sun
multi-stopAmerican Airlines
11h 45mDEN-YUL
$399
6/23Mon
multi-stopUnited Airlines
15h 20mYOW-DEN
6/30Mon
multi-stopUnited Airlines
18h 10mDEN-YOW
$451
6/23Mon
multi-stopAmerican Airlines
17h 27mYUL-DEN
6/24Tue
multi-stopAmerican Airlines
6h 55mDEN-YUL
$489
6/19Thu
multi-stopWestJet
14h 52mYYZ-DEN
6/22Sun
multi-stopWestJet
8h 32mDEN-YYZ
$717
6/19Thu
multi-stopWestJet
11h 04mYYZ-DEN
6/22Sun
multi-stopWestJet
8h 32mDEN-YYZ
$721
6/20Fri
multi-stopDelta
7h 09mYYZ-DEN
6/26Thu
multi-stopDelta
6h 26mDEN-YYZ
$860
6/21Sat
multi-stopDelta
8h 21mYYZ-DEN
6/26Thu
multi-stopDelta
6h 26mDEN-YYZ
$907

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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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