$150+ Cheap flights from Ontario to Colorado
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
May 30 — Jun 61
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Colorado with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Ontario to ColoradoExplore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2026.
Explore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/225:45 pm
YUL
- DEN
2 stops19h 35m
WestJet
Wed 7/112:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/25![WestJet logo]()
$321
This oojo deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:45 am
YUL
- DEN
2 stops30h 35m
WestJet
Tue 6/212:15 pm
DEN
- YUL
2 stops34h 10m
WestJet
Deal found 4/27![WestJet logo]()
$323
This Trip.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:15 am
YUL
- DEN
1 stop30h 05m
WestJet
Sun 8/2312:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/27![WestJet logo]()
$325
This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/178:00 pm
YUL
- DEN
1 stop17h 20m
WestJet
Mon 7/2012:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/28![WestJet logo]()
$326
This oojo deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:30 pm
YUL
- DEN
1 stop19h 50m
WestJet
Mon 9/712:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/29![WestJet logo]()
$328
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:00 pm
YUL
- DEN
1 stop17h 20m
WestJet
Fri 7/2412:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/28![WestJet logo]()
$329
This lastminute.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:45 am
YUL
- DEN
2 stops30h 35m
WestJet
Thu 5/2812:15 pm
DEN
- YUL
2 stops28h 05m
WestJet
Deal found 4/29![WestJet logo]()
$334
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/198:00 pm
YUL
- DEN
1 stop17h 20m
WestJet
Sun 7/2612:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/25![WestJet logo]()
$336
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/181:20 pm
YOW
- DEN
1 stop24h 00m
WestJet
Wed 5/2012:15 pm
DEN
- YOW
2 stops22h 15m
WestJet
Deal found 4/28![WestJet logo]()
$336
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:45 pm
YUL
- DEN
2 stops19h 35m
WestJet
Thu 6/2512:15 pm
DEN
- YUL
1 stop26h 15m
WestJet
Deal found 4/28![WestJet logo]()
$337
This FlightHub deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Tue 5/2612:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Deal found 4/27![WestJet logo]()
$352
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/45:45 pm
YYZ
- COS
1 stop6h 37m
Delta
Sun 6/76:00 am
COS
- YYZ
1 stop9h 19m
Delta
Deal found 4/28![Delta logo]()
$363
Best flights from Ontario to ColoradoDiscover carefully curated flight deals from Ontario to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2026.
Discover carefully curated flight deals from Ontario to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2026.
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/181:20 pm
YOW
- DEN
1 stop24h 00m
WestJet
Wed 5/2012:15 pm
DEN
- YOW
2 stops22h 15m
WestJet
Deal found 4/28![WestJet logo]()
$336
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/51:34 pm
YYZ
- COS
1 stop9h 53m
Delta
Tue 6/91:40 pm
COS
- YYZ
1 stop8h 18m
Delta
Deal found 4/29![Delta logo]()
$369
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/213:53 pm
YYZ
- COS
2 stops9h 56m
United Airlines
Mon 8/2412:51 pm
COS
- YYZ
1 stop6h 41m
United Airlines
Deal found 4/29![United Airlines logo]()
$386
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1011:55 am
YTZ
- DEN
2 stops25h 25m
Multiple Airlines
Wed 6/177:43 am
DEN
- YTZ
1 stop6h 17m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$447
This Air Canada deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:45 am
YYZ
- DEN
Nonstop3h 48m
Air Canada
Thu 5/146:10 pm
DEN
- YYZ
Nonstop3h 13m
Air Canada
Deal found 4/24![Air Canada logo]()
$449
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/187:17 am
YUL
- COS
2 stops17h 07m
American Airlines
Sat 8/15:15 pm
COS
- YUL
2 stops17h 14m
American Airlines
Deal found 4/28![American Airlines logo]()
$485
This oojo deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:15 pm
YOW
- DEN
2 stops19h 05m
WestJet
Sun 9/2712:15 pm
DEN
- YOW
2 stops22h 15m
WestJet
Deal found 4/26![WestJet logo]()
$380
This Delta deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:45 am
YYZ
- COS
1 stop7h 13m
Delta
Sat 10/318:00 am
COS
- YYZ
1 stop6h 39m
Delta
Deal found 4/25![Delta logo]()
$386
This United Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:00 am
YYZ
- COS
1 stop5h 59m
United Airlines
Sat 8/296:00 am
COS
- YYZ
1 stop7h 14m
United Airlines
Deal found 4/26![United Airlines logo]()
$386
This FlightHub deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/184:15 pm
YOW
- DEN
1 stop21h 05m
WestJet
Wed 6/2412:15 pm
DEN
- YOW
1 stop27h 00m
WestJet
Deal found 4/27![WestJet logo]()
$380
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/281:34 pm
YYZ
- COS
1 stop9h 53m
Delta
Thu 6/46:00 am
COS
- YYZ
1 stop9h 15m
Delta
Deal found 4/28![Delta logo]()
$387
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1710:50 am
YTZ
- DEN
2 stops14h 14m
Multiple Airlines
Sat 6/207:43 am
DEN
- YTZ
1 stop6h 17m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$465
This Air Canada deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/266:40 pm
YYZ
- DEN
Nonstop3h 42m
Air Canada
Mon 6/296:10 pm
DEN
- YYZ
Nonstop3h 12m
Air Canada
Deal found 4/24![Air Canada logo]()
$466
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:25 am
YOW
- COS
1 stop6h 34m
United Airlines
Wed 9/212:45 pm
COS
- YOW
1 stop6h 50m
United Airlines
Deal found 4/28![United Airlines logo]()
$429
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:55 am
YOW
- DEN
2 stops30h 25m
WestJet
Wed 7/1512:15 pm
DEN
- YOW
2 stops22h 15m
WestJet
Deal found 4/25![WestJet logo]()
$393
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2812:40 pm
YUL
- COS
1 stop10h 47m
Delta
Thu 6/46:00 am
COS
- YUL
1 stop9h 43m
Delta
Deal found 4/27![Delta logo]()
$399
This Air Canada deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:10 am
YUL
- DEN
Nonstop4h 24m
Air Canada
Sun 5/1711:30 am
DEN
- YUL
1 stop8h 20m
Air Canada
Deal found 4/26![Air Canada logo]()
$477
This eDestinos deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/108:40 pm
YKF
- DEN
2 stops53h 58m
Multiple Airlines
Wed 6/177:45 am
DEN
- YKF
2 stops34h 05m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$494
This FlightHub deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/258:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Tue 6/3012:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 4/25![WestJet logo]()
$413
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/129:30 am
YUL
- COS
2 stops13h 37m
Delta
Fri 6/196:00 am
COS
- YUL
1 stop9h 45m
Delta
Deal found 4/28![Delta logo]()
$415
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:55 pm
YUL
- DEN
1 stop8h 58m
United Airlines
Tue 6/26:13 am
DEN
- YUL
1 stop6h 27m
United Airlines
Deal found 4/27![United Airlines logo]()
$482
This WestJet deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:15 pm
YOW
- DEN
2 stops19h 05m
WestJet
Sat 6/612:15 pm
DEN
- YOW
1 stop15h 20m
WestJet
Deal found 4/28![WestJet logo]()
$423
This Mytrip deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/87:00 am
YHM
- DEN
2 stops30h 20m
Multiple Airlines
Tue 6/1612:15 pm
DEN
- YHM
1 stop8h 58m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$517
This Delta deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/181:30 pm
YYZ
- COS
1 stop9h 45m
Delta
Sun 9/206:00 am
COS
- YYZ
2 stops14h 57m
Delta
Deal found 4/25![Delta logo]()
$429
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:55 pm
YUL
- DEN
1 stop8h 58m
United Airlines
Sat 6/61:53 pm
DEN
- YUL
1 stop8h 20m
United Airlines
Deal found 4/27![United Airlines logo]()
$489
This Justfly.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/118:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Wed 7/1512:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 4/25![WestJet logo]()
$429
This Air Canada deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/810:45 am
YTZ
- DEN
1 stop10h 15m
Air Canada
Sun 5/1011:25 am
DEN
- YTZ
1 stop8h 07m
Air Canada
Deal found 4/25![Air Canada logo]()
$577
This Delta deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:55 am
YOW
- DEN
2 stops9h 04m
Delta
Sat 6/66:05 am
DEN
- YOW
2 stops9h 30m
Delta
Deal found 4/25![Delta logo]()
$440
This United Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/146:35 pm
YUL
- DEN
1 stop8h 09m
United Airlines
Sun 5/176:00 am
DEN
- YUL
1 stop6h 40m
United Airlines
Deal found 4/26![United Airlines logo]()
$489
This Mytrip deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:00 am
YHM
- DEN
2 stops30h 20m
Multiple Airlines
Fri 6/512:15 pm
DEN
- YHM
1 stop8h 58m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$547
Last-minute flights from Ontario to ColoradoDiscover last-minute flight deals from Ontario to Colorado. Data last updated April 30, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Colorado. Data last updated April 30, 2026 and is based on user searches.
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/181:20 pm
YOW
- DEN
1 stop24h 00m
WestJet
Wed 5/2012:15 pm
DEN
- YOW
2 stops22h 15m
WestJet
Deal found 4/28![WestJet logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:55 am
YTZ
- DEN
2 stops15h 29m
Multiple Airlines
Tue 5/262:40 pm
DEN
- YTZ
1 stop23h 20m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$401
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/216:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Thu 6/412:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Deal found 4/28![WestJet logo]()
$364
This FlightHub deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Tue 5/2612:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Deal found 4/27![WestJet logo]()
$352
This Kiwi.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2310:25 pm
YYZ
- DEN
1 stop14h 55m
Multiple Airlines
Sat 5/309:28 pm
DEN
- YYZ
2 stops15h 32m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$398
This oojo deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:45 am
YUL
- DEN
2 stops30h 35m
WestJet
Tue 6/212:15 pm
DEN
- YUL
2 stops34h 10m
WestJet
Deal found 4/27![WestJet logo]()
$323
This lastminute.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:45 am
YUL
- DEN
2 stops30h 35m
WestJet
Thu 5/2812:15 pm
DEN
- YUL
2 stops28h 05m
WestJet
Deal found 4/29![WestJet logo]()
$334
This FlightHub deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:45 am
YUL
- DEN
2 stops30h 35m
WestJet
Fri 6/512:15 pm
DEN
- YUL
2 stops34h 10m
WestJet
Deal found 4/29![WestJet logo]()
$342
This FlightHub deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:45 am
YUL
- DEN
2 stops30h 35m
WestJet
Sat 6/612:15 pm
DEN
- YUL
2 stops26h 30m
WestJet
Deal found 4/29![WestJet logo]()
$348
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/261:34 pm
YYZ
- COS
1 stop9h 53m
Delta
Tue 6/26:00 am
COS
- YYZ
1 stop9h 15m
Delta
Deal found 4/28![Delta logo]()
$370
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2810:00 am
YYZ
- COS
2 stops13h 27m
Delta
Thu 6/46:00 am
COS
- YYZ
1 stop9h 15m
Delta
Deal found 4/28![Delta logo]()
$387
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2812:40 pm
YUL
- COS
1 stop10h 47m
Delta
Thu 6/46:00 am
COS
- YUL
1 stop9h 43m
Delta
Deal found 4/27![Delta logo]()
$399
One-way flights from Ontario to ColoradoSearch for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
Search for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/278:55 am
YTZ
- DEN
1 stop16h 49m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$150
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:10 am
YYZ
- DEN
2 stops31h 10m
WestJet
Deal found 4/25![WestJet logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/288:55 am
YTZ
- DEN
1 stop16h 49m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$158
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1710:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/25![WestJet logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/268:00 pm
YYZ
- DEN
1 stop17h 20m
WestJet
Deal found 4/29![WestJet logo]()
$162
This FlightHub deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/215:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Deal found 4/27![WestJet logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/274:45 pm
YYZ
- DEN
1 stop6h 44m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$171
This oojo deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/258:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/26![WestJet logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:10 am
YYZ
- DEN
3 stops23h 15m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$173
This Trip.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/298:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/29![WestJet logo]()
$174
This WestJet deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2510:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/27![WestJet logo]()
$174
This oojo deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:30 pm
YUL
- DEN
1 stop19h 50m
WestJet
Deal found 4/26![WestJet logo]()
$175
Find flight deals from Ontario to Colorado
Keep the following information in mind while searching for Ontario to Colorado flight deals. Data was last updated April 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $321 (Kiwi.com) |
One-way from | $150 (Kiwi.com) |
Popular in | February |
Cheapest in | November |
Average price | $467 |
Good round-trip deal | $465 or less |
Good one-way deal | $250 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Colorado that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 30, 2026.
Use the filters below to find and compare flights from Ontario to Colorado that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OttawaDenver
YOW - DEN
YOWDEN
Ottawa
Mon 5/18
1:20 pm-11:20 am
1 stop24h 00m
Denver Intl
Wed 5/20
12:15 pm-12:30 pm
2 stops22h 15m
$336
TorontoColorado Springs
YYZ - COS
YYZCOS
Toronto Pearson Intl
Fri 6/5
1:34 pm-9:27 pm
1 stop9h 53m
Colorado Springs
Tue 6/9
1:40 pm-11:58 pm
1 stop8h 18m
$369
OttawaDenver
YOW - DEN
YOWDEN
Ottawa
Wed 9/23
6:15 pm-11:20 am
2 stops19h 05m
Denver Intl
Sun 9/27
12:15 pm-12:30 pm
2 stops22h 15m
$380
OttawaDenver
YOW - DEN
YOWDEN
Ottawa
Thu 6/18
4:15 pm-11:20 am
1 stop21h 05m
Denver Intl
Wed 6/24
12:15 pm-5:15 pm
1 stop27h 00m
$380
TorontoColorado Springs
YYZ - COS
YYZCOS
Toronto Pearson Intl
Fri 8/21
3:53 pm-11:49 pm
2 stops9h 56m
Colorado Springs
Mon 8/24
12:51 pm-9:32 pm
1 stop6h 41m
$386
TorontoColorado Springs
YYZ - COS
YYZCOS
Toronto Pearson Intl
Tue 10/27
7:45 am-12:58 pm
1 stop7h 13m
Colorado Springs
Sat 10/31
8:00 am-4:39 pm
1 stop6h 39m
$386
TorontoColorado Springs
YYZ - COS
YYZCOS
Toronto Pearson Intl
Sat 8/22
7:00 am-10:59 am
1 stop5h 59m
Colorado Springs
Sat 8/29
6:00 am-3:14 pm
1 stop7h 14m
$386
TorontoColorado Springs
YYZ - COS
YYZCOS
Toronto Pearson Intl
Thu 5/28
1:34 pm-9:27 pm
1 stop9h 53m
Colorado Springs
Thu 6/4
6:00 am-5:15 pm
1 stop9h 15m
$387
OttawaDenver
YOW - DEN
YOWDEN
Ottawa
Wed 7/8
6:55 am-11:20 am
2 stops30h 25m
Denver Intl
Wed 7/15
12:15 pm-12:30 pm
2 stops22h 15m
$393
MontrealColorado Springs
YUL - COS
YULCOS
Montreal Pierre Elliott Trudeau Intl
Thu 5/28
12:40 pm-9:27 pm
1 stop10h 47m
Colorado Springs
Thu 6/4
6:00 am-5:43 pm
1 stop9h 43m
$399
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Colorado
Have a flexible travel schedule? Discover the best time to fly to Colorado from Ontario with our price prediction graph.
YOW-DEN
YYZ-COS
YTZ-DEN
YYZ-DEN
YUL-COS
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Colorado
CAON-USCO
YOW-DEN
YYZ-COS
YTZ-DEN
YYZ-DEN
How far ahead should I book a flight from Region of Ontario to Colorado?
To ensure you get the cheapest price possible for a flight from Region of Ontario to Colorado, you should look to book at least 75 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Region of Ontario to Colorado?
Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of $130). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of $295). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ON to CO?
Find hourly flight availability from Ontario to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 30, 2026.
When flying from Region of Ontario to Colorado, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Weekly flight availability from Region of Ontario to Colorado
Explore weekly flight availability from Ontario to Colorado. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 30, 2026.
The most flights from CAON to USCO are scheduled on a Thursday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from Region of Ontario to Colorado?
Reviews of airlines servicing Colorado
Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated April 30, 2026.
Peruse reviews from past customers who have flown with United Airlines and Air Canada from Ontario to Colorado to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.1
Comfort
7.3
Food
6.6
Overall
7.4
Crew
8.1
Boarding
7.7
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Entertainment
7.1
Comfort
7.3
Food
6.6
Overall
7.4
Crew
8.1
Boarding
7.7
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Entertainment
7.1
Comfort
7.3
Food
6.6
Overall
7.4
Crew
8.1
Boarding
7.7
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Related info for your journey
Find useful and relevant information for your journey from Ontario to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Ontario to Colorado
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Colorado by cabin class
Find flights from Ontario to Colorado, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Colorado flights
Browse other Ontario and Colorado flight options. Last updated on April 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Colorado
Find the right flight back to Ontario after your stay in Colorado
Ontario to Colorado flights
Consider these flights traveling from Ontario to Colorado.
Top 2 airlines flying from Ontario to Colorado
Discover the top 2 airlines that operate flights from Ontario to Colorado. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$218 | Average$597 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$312 | Average$538 | FlexibilityNo cancel fee | On-time67% |