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$118 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 9/24. 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
0 bags
Sun 8/25
Sun 9/1

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Good to know

Low season

January

High season

August

Cheapest flight

$118
Best time to beat the crowds but there is an average 11% increase in price.
Most popular time to fly and prices are also 0% lower on average.
Flight from Toronto Pearson Airport to Denver

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

See more FAQs

Top 4 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.
8.2
Singapore AirlinesOverall score based on 1367 reviews
7.7Food
8.4Boarding
8.0Comfort
8.1Entertainment
8.6Crew
Airline reviews

Singapore Airlines from Mumbai was late, we were rerouted to Copenhagen and then to Los Angeles. As senior citizens, we should have been given a hotel voucher for a night and fly out the next day. I hope Singapore Airlines should give us a credit in good faith if they want us to fly with them. I doubt it, but you never know.

2.0 MediocreAnonymous, Jul 2024SIN - LAX
Read more about Singapore Airlines reviews

Singapore Airlines from Mumbai was late, we were rerouted to Copenhagen and then to Los Angeles. As senior citizens, we should have been given a hotel voucher for a night and fly out the next day. I hope Singapore Airlines should give us a credit in good faith if they want us to fly with them. I doubt it, but you never know.

They bumped us up. They overbooked the flight and we hurried to the next flight. We are a family of 5 with 13, 10 , and 6 year olds kids. Everybody was running to the next flight. We never been exhausted in our flights hust like we have experienced this week. Mismanagement in scoot and kayak.

I had to change a flight date and it cost me $800.00 dollars. In the past, if there was room on the flight(which there was), Singapore Airlines simply re-booked me. This might have occurred because the office in Bali where I could interface with a human face to face is now closed since COVID. I naively figured the ability to change my flight into my decision to go with Singapore Airlines as it does cost a bit more. I will still fly on them as they are superior to the other carriers by a fairly large margin, especially for my needs.

I was traveling with my 3 minor children, one leg I was seated two aisles behind them. On the longest leg I would have preferred sitting across the aisle from them, not behind. My youngest is 4yos. I understand airplane seating configurations are not the airlines problem but seating the one adult with a reservation apart from the minors was very difficult.

If I made the connection in Singapore I was stuck there for 24 hours you owe me 355.00 for accommodations

plus: service and personal assistance minus: online check-in did not work

My overall experience with Singapore Airlines is great. Will definitely fly Singapore airline again.

I commend the flight attendants on our SFO-SIN flight who went above and beyond to provide us with extra snacks and food. This type of service makes the flight experience personal and awesome.

Seating cramped; close to toilet, foul smelling and noisy, very unhygienic and disease risk Free and paid Wi-Fi NOT accessible at all - misleading advertising Very expensive sunglasses disappeared from back seat pouch. Coffee disgusting and cold

When boarding, after business class should be premium economy, but economy class already lined-up at the gate blocking premium economy to board. Singapore airline crew should done a better job to organize this chaos :( Thank you.

The employees are very nice and good. The delay due to the aircraft is not a good thing. Planning for such problems should be an easy task.

Flight delayed in NYC and missed Hong Kong connecting flight to Guangzhou. While being given a hotel room and a 30 dollar voucher to eat in the airport, the delay caused a few big inconveniences , a 12 hour delay should have been better compensated for.

Wanted different plane design with an additional bathroom at the back of the plane.

The crew staffs are very nice. The temperature is too low.

Unfortunately I ended up beside a person who seemed to have been eating rotten corpses before landing because his breath smelled like Calcutta Sewage mixed with vodka and undigested eggs. Even wearing a mask that smell was so permeating that I couldn't breathe for the whole duration of the flight. I understand this is not CATHAY's fault but nevertheless I as a passenger had to endure this and there wasn't any way to fix it

Bad experience. Departure time delayed from 1610 to 1740. After the flight was pushed back, pilot said there was a technical issue on the aircraft and we couldn’t take off. Delayed another hour to solve it.

The flight was cancelled. I wasn't informed where to check in, how and when. It wasn't easy to get in contact with Cathay service representative, and they were not very helpful... The staff on the airport - Air Canada (I assume) were the most helpful, kind efficient, patient... Thank you for all your help and care, for your patience, for your professionalism!!!

The overall flight went well and the aircrew was pleasant.

Very comfortable Prem economy seats for a long haul flight. Had a problem with the tv that the crew fixed so was great!

we were upgraded which was a blessing and tender mercy for us. I fell the day before and was in extreme pain from knee to shoulder. Sitting in a more comfortable seat during the flight was an unexpected blessing and experience.

The cosmetic condition was pretty run down. The carpets were badly worn out. Even the paint on the wings was chipped and peeled! Looks like they are running these 787s to the ground..

WiFi didn’t work on both sectors so made killing time harder - planes clean modern and good flight crew - would do again if WiFi works

6hrs fly they dont give you a glass of water from seoul to singapore need to buy drink and food plus they charge for bag on international fly is always Free 1 bag from seoul to singapore is Not a local fly you are traveling true asia same story from singapore to Bali no water drink after payment for bag drink cost more the regular airline Well never use this company again we use regular company like Delta korea japan China and even scoot parent company Singapore Air

We had 2 attempts to land at Singapore Changing during a thunderstorm. Everything was delayed by 1 hour plus.

Boarding was not accordingly after front seat, bmf then back seat. This delayed for at least 40mins or more. The staff at Jakarta can do better. Is chaos at the entry to board the plane. This tarnished Scoot reputation when everyone was talking about it.

The crew was not customer oriented at all, even confrontational . The aircraft needs more attention to detail as far as comfort, and the 1 hour sitting at the gate with no air is inexcusable

We flew on the 787 Dreamliner direct to main gate at KLIA2, quick entry via eGate and on the train 41mins after touchdown. Go well SCOOT

Was on scoot plus. The only good thing about the flight was the spacious seats. Tables and armrests were extremely dirty Food: bad Entertainment: non existent Wifi: unable to connect, then was painfully slow that we couldn’t even send messages Good thing we had a night flight, so we just slept throughout.

Not clear why boarding passes could only be issued at the counter and not through the kiosk. I had already check-in on the web, so waiting to obtain a boarding pass 1.5 hours before the actual flight defeats the purpose of early web check-in.

no charging point. food offering is limited and very much on the budget line. Overall is not satisfying for such a price and duration of flight.

Delay flight more than 8hours waiting and poor customer service!

Plane was extremely small so mind the size of your carry on

Other than lack of snacks, everything else went very well.

They don’t keep you updated on the flight status very well. It was late but nothing said

Pros: "Nothing!!! Horrible airline with horrible staff members."
Cons: "Everything. The staff and crew of Intercaribbean airlines are very unprofessional and not helpful at all. On top of the flight delays all the luggage for that particular flight was left in Kingston. Everybody was rather nonchalant and unapologetic about the situation. I was told I would get the the following day. The next day only two of my three bags showed up. I was not compensated for the inconvenience and was told point blank that they will only deliver one of my bags to my address even though they were the reason I had NONE of my luggage in the first place. They are disgusting!!! I would never recommend this airline to anyone."
Pros: "Nice people"
Cons: "A long walk to the D3 gate, but there were no amenities there I.e. snacks (to be fair a new terminal is under construction)"
Cons: "There was no air. I understand when you are on the ground it can be limited but even after getting to altitude there was no air conditioning."
Cons: "The flight was delayed for over three hours, apparently it is a regular occurence."
Pros: "almost nothing"
Cons: "The plane had a problem that forced us to turn around right after take off and as of this writing we still don’t know what’s going on or how long we are stuck here. Planes are old and apparently maintenance could be better."
Cons: "Was a bit difficult understanding the flight attendant, she had a thick Spanish accent"

Book cheap flights from Ontario to Colorado

Recent round-trip flight deals

9/4Wed
1 stop
10h 03mYYZ-DEN
9/11Wed
1 stop
14h 45mDEN-YYZ
$208
9/7Sat
1 stopWestJet
8h 32mYUL-DEN
9/14Sat
1 stopWestJet
8h 10mDEN-YUL
$210
9/1Sun
1 stopAmerican Airlines
12h 13mYYZ-COS
9/7Sat
1 stopAmerican Airlines
14h 56mCOS-YYZ
$255
9/13Fri
2 stopsDelta
12h 28mYYZ-COS
9/16Mon
2 stopsDelta
14h 57mCOS-YYZ
$262
9/13Fri
1 stopAmerican Airlines
18h 35mYYZ-COS
9/16Mon
1 stopAmerican Airlines
17h 45mCOS-YYZ
$264
8/14Wed
2 stopsDelta
15h 50mYUL-COS
8/20Tue
2 stopsDelta
15h 01mCOS-YUL
$281
9/13Fri
nonstopUnited Airlines
3h 45mYYZ-DEN
9/19Thu
1 stopUnited Airlines
11h 07mDEN-YYZ
$284
8/14Wed
1 stopUnited Airlines
7h 01mYUL-COS
8/20Tue
2 stopsUnited Airlines
13h 41mCOS-YUL
$296
8/9Fri
nonstopAir Canada
3h 41mYYZ-DEN
8/15Thu
1 stopAir Canada
6h 42mDEN-YYZ
$336
10/10Thu
1 stopAir Canada
13h 45mYOW-DEN
10/13Sun
1 stopAir Canada
9h 18mDEN-YOW
$354

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Recent one-way flight deals

9/24Tue
1 stop
10h 03mYYZ-DEN
$118
10/1Tue
1 stop
17h 19mYYZ-DEN
$127
9/4Wed
1 stopWestJet
9h 25mYOW-DEN
$132
9/9Mon
1 stopWestJet
9h 25mYOW-DEN
$144
9/13Fri
1 stopAir Canada
5h 07mYYZ-COS
$155
8/17Sat
1 stopAmerican Airlines
18h 32mYYZ-COS
$159
9/25Wed
nonstopAir Canada
3h 45mYYZ-DEN
$203
8/13Tue
1 stopUnited Airlines
7h 22mYYZ-DEN
$216
9/25Wed
2 stopsAmerican Airlines
9h 23mYYZ-DEN
$227
9/13Fri
3 stopsUnited Airlines
30h 22mYYZ-COS
$421

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Last minute flights from Ontario to Colorado

Last minute flight, train and bus deals

7/30Tue
multi-stopWestJet
22h 32mYUL-DEN
8/6Tue
multi-stopWestJet
8h 10mDEN-YUL
$519
7/31Wed
multi-stop
10h 30mYUL-DEN
8/7Wed
nonstop
3h 40mDEN-YUL
$609
7/31Wed
multi-stopAir Canada
11h 57mYYZ-DEN
8/15Thu
nonstopAir Canada
3h 08mDEN-YYZ
$682
7/30Tue
multi-stopAmerican Airlines
12h 26mYUL-DEN
8/27Tue
multi-stopAmerican Airlines
13h 34mDEN-YUL
$685
7/27Sat
multi-stopUnited Airlines
5h 40mYYZ-ASE
8/2Fri
multi-stopUnited Airlines
6h 20mASE-YYZ
$703
7/28Sun
multi-stopAmerican Airlines
13h 37mYYZ-ASE
8/3Sat
multi-stopAmerican Airlines
16h 11mASE-YYZ
$717
7/28Sun
multi-stopUnited Airlines
6h 58mYYZ-ASE
8/3Sat
multi-stopUnited Airlines
6h 20mASE-YYZ
$724
7/31Wed
nonstopAir Canada
4h 17mYUL-DEN
8/7Wed
nonstopAir Canada
3h 40mDEN-YUL
$737
7/30Tue
multi-stopDelta
10h 15mYYZ-DEN
8/6Tue
multi-stopDelta
8h 50mDEN-YYZ
$800
7/31Wed
multi-stopDelta
12h 27mYUL-DEN
8/6Tue
multi-stopDelta
8h 54mDEN-YUL
$871

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