$186+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
Jul 15 — Jul 221
Round-trip
1 adult, Economy
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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 June 15, 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 June 15, 2026.
This United Airlines deal was found by Cheapflights users on 6/14. 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 7/106:30 pm
YUL
- DEN
1 stop29h 31m
United Airlines
Sun 7/129:40 am
DEN
- YUL
Nonstop3h 48m
United Airlines
Deal found 6/14![United Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 6/10. 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 8/216:30 pm
YUL
- DEN
1 stop29h 14m
United Airlines
Sun 8/239:40 am
DEN
- YUL
Nonstop3h 48m
United Airlines
Deal found 6/10![United Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 9/91:40 pm
YTZ
- DEN
1 stop12h 49m
Multiple Airlines
Sat 9/266:25 am
DEN
- YTZ
1 stop6h 00m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$351
This Kiwi.com deal was found by Cheapflights users on 6/13. 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 9/91:40 pm
YTZ
- DEN
1 stop12h 49m
Multiple Airlines
Mon 9/145:56 pm
DEN
- YTZ
1 stop13h 44m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$352
This oojo deal was found by Cheapflights users on 6/15. 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 7/202:25 pm
YYZ
- DEN
2 stops22h 55m
WestJet
Fri 7/2412:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/15![WestJet logo]()
$354
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Fri 7/3110:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$356
This oojo deal was found by Cheapflights users on 6/13. 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 7/1612:00 pm
YYZ
- DEN
2 stops25h 20m
WestJet
Fri 7/2412:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/13![WestJet logo]()
$357
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 9/161:40 pm
YTZ
- DEN
1 stop12h 49m
Multiple Airlines
Thu 9/246:25 am
DEN
- YTZ
1 stop6h 00m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$362
This oojo deal was found by Cheapflights users on 6/10. 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 7/15:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Mon 7/612:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/10![WestJet logo]()
$365
This oojo deal was found by Cheapflights users on 6/15. 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.
Fri 7/315:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Sun 8/212:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/15![WestJet logo]()
$367
This oojo deal was found by Cheapflights users on 6/11. 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.
Fri 7/172:25 pm
YYZ
- DEN
2 stops22h 55m
WestJet
Tue 7/2112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/11![WestJet logo]()
$369
This oojo deal was found by Cheapflights users on 6/11. 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 7/145:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Tue 7/2112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/11![WestJet logo]()
$371
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 June 15, 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 June 15, 2026.
This United Airlines deal was found by Cheapflights users on 6/14. 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 7/106:30 pm
YUL
- DEN
1 stop29h 31m
United Airlines
Sun 7/129:40 am
DEN
- YUL
Nonstop3h 48m
United Airlines
Deal found 6/14![United Airlines logo]()
$334
This oojo deal was found by Cheapflights users on 6/10. 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 7/18:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Mon 7/612:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 6/10![WestJet logo]()
$375
This United deal was found by Cheapflights users on 6/13. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1210:45 am
YYZ
- DEN
Nonstop3h 43m
Multiple Airlines
Tue 9/1511:35 am
DEN
- YYZ
Nonstop3h 10m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$420
This Delta deal was found by Cheapflights users on 6/11. 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 8/610:00 am
YYZ
- COS
2 stops13h 38m
Delta
Wed 8/126:00 am
COS
- YYZ
1 stop9h 19m
Delta
Deal found 6/11![Delta logo]()
$424
This Air Canada deal was found by Cheapflights users on 6/10. 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 11/2012:30 pm
YTZ
- DEN
1 stop9h 57m
Air Canada
Tue 11/2411:15 am
DEN
- YTZ
1 stop8h 20m
Air Canada
Deal found 6/10![Air Canada logo]()
$445
This American Airlines deal was found by Cheapflights users on 6/12. 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.
Fri 9/182:56 pm
YYZ
- COS
1 stop9h 59m
American Airlines
Sun 9/208:00 am
COS
- YYZ
1 stop12h 59m
American Airlines
Deal found 6/12![American Airlines logo]()
$480
This United Airlines deal was found by Cheapflights users on 6/10. 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 8/216:30 pm
YUL
- DEN
1 stop29h 14m
United Airlines
Sun 8/239:40 am
DEN
- YUL
Nonstop3h 48m
United Airlines
Deal found 6/10![United Airlines logo]()
$335
This oojo deal was found by Cheapflights users on 6/15. 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.
Fri 7/318:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Sun 8/212:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 6/15![WestJet logo]()
$376
This oojo deal was found by Cheapflights users on 6/13. 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 8/208:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Thu 8/2712:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 6/13![WestJet logo]()
$379
This Delta deal was found by Cheapflights users on 6/10. 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 10/295:50 pm
YYZ
- COS
1 stop6h 40m
Delta
Mon 11/26:00 am
COS
- YYZ
2 stops15h 00m
Delta
Deal found 6/10![Delta logo]()
$427
This United deal was found by Cheapflights users on 6/11. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/213:00 pm
YYZ
- DEN
1 stop8h 18m
Multiple Airlines
Fri 7/316:05 pm
DEN
- YYZ
Nonstop3h 12m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$441
This United Airlines deal was found by Cheapflights users on 6/10. 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 11/2010:15 am
YYZ
- DEN
Nonstop3h 46m
United Airlines
Tue 11/249:58 am
DEN
- YYZ
Nonstop3h 14m
United Airlines
Deal found 6/10![United Airlines logo]()
$407
This oojo deal was found by Cheapflights users on 6/14. 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.
Fri 7/318:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Mon 8/312:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 6/14![WestJet logo]()
$379
This United deal was found by Cheapflights users on 6/15. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/157:43 pm
YYZ
- DEN
1 stop6h 47m
Multiple Airlines
Mon 7/206:05 pm
DEN
- YYZ
Nonstop3h 12m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$441
This Delta deal was found by Cheapflights users on 6/15. 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 7/911:40 am
YYZ
- COS
1 stop11h 27m
Delta
Sun 7/126:00 am
COS
- YYZ
1 stop9h 19m
Delta
Deal found 6/15![Delta logo]()
$452
This oojo deal was found by Cheapflights users on 6/11. 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 8/246:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Mon 8/3112:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Deal found 6/11![WestJet logo]()
$393
This United Airlines deal was found by Cheapflights users on 6/15. 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.
Wed 7/810:45 am
YYZ
- DEN
Nonstop3h 45m
United Airlines
Sat 7/114:29 pm
DEN
- YYZ
1 stop5h 30m
United Airlines
Deal found 6/15![United Airlines logo]()
$436
This United deal was found by Cheapflights users on 6/12. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/14:18 pm
YYZ
- DEN
Nonstop3h 45m
Multiple Airlines
Sun 7/511:25 am
DEN
- YYZ
1 stop6h 30m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$442
This Delta deal was found by Cheapflights users on 6/14. 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 8/610:00 am
YYZ
- COS
2 stops13h 38m
Delta
Mon 8/106:00 am
COS
- YYZ
1 stop9h 19m
Delta
Deal found 6/14![Delta logo]()
$452
This oojo deal was found by Cheapflights users on 6/10. 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 8/277:20 am
YOW
- DEN
1 stop30h 00m
WestJet
Sun 8/3012:15 pm
DEN
- YOW
2 stops34h 05m
WestJet
Deal found 6/10![WestJet logo]()
$402
This United deal was found by Cheapflights users on 6/14. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/212:30 pm
YYZ
- DEN
1 stop12h 00m
Multiple Airlines
Sun 8/26:05 pm
DEN
- YYZ
Nonstop3h 12m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 6/14. 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 7/92:30 pm
YYZ
- DEN
1 stop12h 00m
United Airlines
Sun 7/124:15 pm
DEN
- YYZ
Nonstop3h 17m
United Airlines
Deal found 6/14![United Airlines logo]()
$444
This Air Canada deal was found by Cheapflights users on 6/12. 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.
Sun 9/206:00 am
YOW
- DEN
1 stop6h 31m
Air Canada
Wed 9/236:05 pm
DEN
- YOW
1 stop5h 30m
Air Canada
Deal found 6/12![Air Canada logo]()
$598
This Delta deal was found by Cheapflights users on 6/11. 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 8/47:55 am
YYZ
- COS
2 stops15h 43m
Delta
Wed 8/1211:27 am
COS
- YYZ
1 stop9h 43m
Delta
Deal found 6/11![Delta logo]()
$454
This United Airlines deal was found by Cheapflights users on 6/10. 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 8/1312:45 pm
YYZ
- DEN
1 stop10h 31m
United Airlines
Sat 8/156:00 am
DEN
- YYZ
1 stop11h 00m
United Airlines
Deal found 6/10![United Airlines logo]()
$445
This United deal was found by Cheapflights users on 6/11. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/257:43 pm
YYZ
- DEN
1 stop6h 47m
Multiple Airlines
Sat 8/16:05 pm
DEN
- YYZ
Nonstop3h 12m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$445
This American Airlines deal was found by Cheapflights users on 6/14. 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.
Tue 8/257:20 am
YYZ
- ASE
1 stop8h 04m
American Airlines
Fri 8/281:54 pm
ASE
- YYZ
1 stop7h 35m
American Airlines
Deal found 6/14![American Airlines logo]()
$653
This Mytrip deal was found by Cheapflights users on 6/11. 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.
Thu 7/167:20 am
YOW
- DEN
1 stop30h 00m
WestJet
Wed 7/2212:15 pm
DEN
- YOW
1 stop25h 05m
WestJet
Deal found 6/11![WestJet logo]()
$415
This Delta deal was found by Cheapflights users on 6/10. 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 8/129:30 am
YUL
- COS
2 stops14h 08m
Delta
Mon 8/1711:27 am
COS
- YUL
1 stop10h 13m
Delta
Deal found 6/10![Delta logo]()
$461
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/76:10 am
YYZ
- DEN
1 stop18h 05m
United Airlines
Fri 8/144:16 pm
DEN
- YYZ
Nonstop3h 16m
United Airlines
Deal found 6/11![United Airlines logo]()
$445
Last-minute flights from Ontario to ColoradoDiscover last-minute flight deals from Ontario to Colorado. Data last updated June 15, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Colorado. Data last updated June 15, 2026 and is based on user searches.
This oojo deal was found by Cheapflights users on 6/10. 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 7/15:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Mon 7/612:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/10![WestJet logo]()
$365
This oojo deal was found by Cheapflights users on 6/10. 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 7/18:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Mon 7/612:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 6/10![WestJet logo]()
$375
This Justfly.com deal was found by Cheapflights users on 6/11. 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.
Thu 7/98:00 pm
YUL
- DEN
1 stop17h 20m
WestJet
Sat 7/1812:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 6/11![WestJet logo]()
$373
This United Airlines deal was found by Cheapflights users on 6/14. 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 7/106:30 pm
YUL
- DEN
1 stop29h 31m
United Airlines
Sun 7/129:40 am
DEN
- YUL
Nonstop3h 48m
United Airlines
Deal found 6/14![United Airlines logo]()
$334
This oojo deal was found by Cheapflights users on 6/11. 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 7/145:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Tue 7/2112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/11![WestJet logo]()
$371
This oojo deal was found by Cheapflights users on 6/12. 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 7/158:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Sat 7/1812:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 6/12![WestJet logo]()
$376
This oojo deal was found by Cheapflights users on 6/13. 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 7/1612:00 pm
YYZ
- DEN
2 stops25h 20m
WestJet
Fri 7/2412:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/13![WestJet logo]()
$357
This oojo deal was found by Cheapflights users on 6/11. 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.
Fri 7/172:25 pm
YYZ
- DEN
2 stops22h 55m
WestJet
Tue 7/2112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/11![WestJet logo]()
$369
This oojo deal was found by Cheapflights users on 6/15. 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 7/202:25 pm
YYZ
- DEN
2 stops22h 55m
WestJet
Fri 7/2412:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/15![WestJet logo]()
$354
This flugladen.de deal was found by Cheapflights users on 6/12. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/275:30 pm
YUL
- DEN
1 stop19h 50m
WestJet
Mon 8/312:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 6/12![WestJet logo]()
$374
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Fri 7/3110:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$356
This oojo deal was found by Cheapflights users on 6/15. 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.
Fri 7/315:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Sun 8/212:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/15![WestJet logo]()
$367
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 June 15, 2026.
Search for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated June 15, 2026.
This Trip.com deal was found by Cheapflights users on 6/14. 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.
Tue 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 6/13. 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 8/1712:55 pm
YYZ
- DEN
1 stop24h 37m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$193
This Trip.com deal was found by Cheapflights users on 6/11. 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.
Wed 7/81:45 pm
YTZ
- DEN
1 stop12h 12m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 10/141:40 pm
YTZ
- DEN
1 stop25h 20m
Multiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$201
This oojo deal was found by Cheapflights users on 6/11. 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 7/98:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/11![WestJet logo]()
$202
This Trip.com deal was found by Cheapflights users on 6/11. 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.
Tue 7/1412:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 8/1710:50 am
YTZ
- DEN
1 stop29h 19m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$205
This FlightHub deal was found by Cheapflights users on 6/11. 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.
Wed 7/88:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/11![WestJet logo]()
$206
This Booking.com deal was found by Cheapflights users on 6/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/168:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/15![WestJet logo]()
$207
This Trip.com deal was found by Cheapflights users on 6/11. 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.
Tue 7/288:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/11![WestJet logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 8/310:50 am
YTZ
- DEN
1 stop29h 33m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$213
This oojo deal was found by Cheapflights users on 6/11. 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 7/82:25 pm
YYZ
- DEN
2 stops22h 55m
WestJet
Deal found 6/11![WestJet logo]()
$217
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 June 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $334 (United Airlines) |
One-way from | $155 (Kiwi.com) |
Popular in | February |
Cheapest in | November |
Average price | $506 |
Good round-trip deal | $469 or less |
Good one-way deal | $253 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 June 15, 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
MontrealDenver
YUL - DEN
YULDEN
Montreal Pierre Elliott Trudeau Intl
Fri 7/10
6:30 pm-10:01 pm
1 stop29h 31m
Denver Intl
Sun 7/12
9:40 am-3:28 pm
Nonstop3h 48m
$334
MontrealDenver
YUL - DEN
YULDEN
Montreal Pierre Elliott Trudeau Intl
Fri 8/21
6:30 pm-9:44 pm
1 stop29h 14m
Denver Intl
Sun 8/23
9:40 am-3:28 pm
Nonstop3h 48m
$335
TorontoDenver
YKF - DEN
YKFDEN
Toronto Region of Waterloo Intl
Wed 7/1
8:40 pm-11:20 am
1 stop16h 40m
Denver Intl
Mon 7/6
12:15 pm-7:50 pm
1 stop29h 35m
$375
TorontoDenver
YKF - DEN
YKFDEN
Toronto Region of Waterloo Intl
Fri 7/31
8:40 pm-11:20 am
1 stop16h 40m
Denver Intl
Sun 8/2
12:15 pm-7:50 pm
1 stop29h 35m
$376
TorontoDenver
YKF - DEN
YKFDEN
Toronto Region of Waterloo Intl
Thu 8/20
8:40 pm-11:20 am
1 stop16h 40m
Denver Intl
Thu 8/27
12:15 pm-7:50 pm
1 stop29h 35m
$379
TorontoDenver
YKF - DEN
YKFDEN
Toronto Region of Waterloo Intl
Fri 7/31
8:40 pm-11:20 am
1 stop16h 40m
Denver Intl
Mon 8/3
12:15 pm-7:50 pm
1 stop29h 35m
$379
HamiltonDenver
YHM - DEN
YHMDEN
Hamilton
Mon 8/24
6:10 pm-11:20 am
1 stop19h 10m
Denver Intl
Mon 8/31
12:15 pm-5:15 pm
1 stop27h 00m
$393
OttawaDenver
YOW - DEN
YOWDEN
Ottawa
Thu 8/27
7:20 am-11:20 am
1 stop30h 00m
Denver Intl
Sun 8/30
12:15 pm-12:20 am
2 stops34h 05m
$402
TorontoDenver
YYZ - DEN
YYZDEN
Toronto Pearson Intl
Fri 11/20
10:15 am-12:01 pm
Nonstop3h 46m
Denver Intl
Tue 11/24
9:58 am-3:12 pm
Nonstop3h 14m
$407
OttawaDenver
YOW - DEN
YOWDEN
Ottawa
Thu 7/16
7:20 am-11:20 am
1 stop30h 00m
Denver Intl
Wed 7/22
12:15 pm-3:20 pm
1 stop25h 05m
$415
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.
YKF-DEN
YYZ-DEN
YYZ-COS
YOW-DEN
YUL-DEN
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
YKF-DEN
YYZ-DEN
YYZ-COS
YOW-DEN
What is the cheapest month to book a flight from Region of Ontario to Colorado?
Currently, July is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of $129). 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 June 15, 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 June 15, 2026.
The most flights from CAON to USCO are scheduled on a Monday (10 on average). You will have fewer flight options on Thursday, 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?
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 54 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.
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 June 15, 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.
Overall
7.4
Comfort
7.3
Food
6.6
Boarding
7.7
Crew
8.1
Entertainment
7.1
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Overall
7.4
Comfort
7.3
Food
6.6
Boarding
7.7
Crew
8.1
Entertainment
7.1
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Overall
7.4
Comfort
7.3
Food
6.6
Boarding
7.7
Crew
8.1
Entertainment
7.1
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
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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 June 15, 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 June 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$251 | Average$517 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$311 | Average$562 | FlexibilityNo cancel fee | On-time67% |