$160+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — DEN
apr 16 — apr 231
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 marzo 17, 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 marzo 17, 2026.
This American Airlines deal was found by Cheapflights users on 3/12. 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.
ven 5/13:45 pm
YUL
- DEN
1 stop10h 00m
American Airlines
gio 5/75:30 am
DEN
- YUL
1 stop7h 14m
American Airlines
Deal found 3/12![American Airlines logo]()
$298
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 4/812:30 pm
YUL
- DEN
2 stops13h 15m
American Airlines
lun 4/136:30 pm
DEN
- YUL
2 stops15h 14m
American Airlines
Deal found 3/13![American Airlines logo]()
$343
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 4/67:30 am
YUL
- DEN
1 stop16h 06m
American Airlines
lun 4/135:44 pm
DEN
- YUL
1 stop16h 00m
American Airlines
Deal found 3/13![American Airlines logo]()
$345
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 3/207:30 am
YUL
- DEN
1 stop7h 49m
American Airlines
mar 3/247:05 am
DEN
- YUL
1 stop13h 51m
American Airlines
Deal found 3/13![American Airlines logo]()
$352
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 4/107:29 am
YUL
- DEN
1 stop12h 57m
American Airlines
lun 4/135:44 pm
DEN
- YUL
1 stop16h 00m
American Airlines
Deal found 3/13![American Airlines logo]()
$356
This American Airlines deal was found by Cheapflights users on 3/12. 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.
sab 5/21:03 pm
YUL
- DEN
2 stops12h 56m
American Airlines
gio 5/75:30 am
DEN
- YUL
1 stop7h 14m
American Airlines
Deal found 3/12![American Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 3/15. 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.
mar 4/1410:45 am
YYZ
- COS
1 stop5h 51m
United Airlines
sab 4/1810:28 am
COS
- YYZ
1 stop9h 04m
United Airlines
Deal found 3/15![United Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
mar 4/289:45 am
YYZ
- DEN
1 stop20h 14m
Multiple Airlines
sab 5/27:54 pm
DEN
- YYZ
2 stops37h 41m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$369
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 8/215:29 pm
YUL
- DEN
1 stop17h 22m
American Airlines
sab 8/295:31 pm
DEN
- YUL
1 stop16h 04m
American Airlines
Deal found 3/13![American Airlines logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
ven 5/228:50 am
YTZ
- DEN
1 stop17h 02m
Multiple Airlines
sab 5/304:59 pm
DEN
- YTZ
1 stop18h 06m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
lun 4/139:25 am
YTZ
- DEN
1 stop26h 47m
Multiple Airlines
lun 4/207:35 am
DEN
- YTZ
1 stop27h 35m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$374
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
gio 4/238:00 pm
YYZ
- DEN
1 stop14h 50m
Multiple Airlines
lun 4/2712:51 pm
DEN
- YYZ
1 stop24h 54m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$374
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 marzo 17, 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 marzo 17, 2026.
This United Airlines deal was found by Cheapflights users on 3/14. 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.
mar 4/1410:45 am
YYZ
- COS
1 stop7h 47m
United Airlines
sab 4/181:33 pm
COS
- YYZ
1 stop5h 59m
United Airlines
Deal found 3/14![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 3/16. 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.
ven 4/179:30 am
YUL
- DEN
1 stop13h 35m
Delta
mar 4/217:12 am
DEN
- YUL
1 stop9h 39m
Delta
Deal found 3/16![Delta logo]()
$446
This Air Canada deal was found by Cheapflights users on 3/16. 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.
mar 5/512:30 pm
YTZ
- DEN
1 stop8h 30m
Air Canada
sab 5/911:25 am
DEN
- YTZ
1 stop8h 07m
Air Canada
Deal found 3/16![Air Canada logo]()
$463
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 4/204:55 pm
YYZ
- DEN
1 stop9h 01m
Alaska Airlines
mar 4/217:00 am
DEN
- YYZ
1 stop30h 45m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$466
This oojo deal was found by Cheapflights users on 3/13. 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.
mer 5/206:55 am
YOW
- DEN
2 stops30h 25m
WestJet
mar 5/2612:15 pm
DEN
- YOW
2 stops22h 15m
WestJet
Deal found 3/13![WestJet logo]()
$484
This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 4/274:00 pm
YHM
- DEN
2 stops22h 35m
Multiple Airlines
lun 5/47:50 pm
DEN
- YHM
2 stops19h 25m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$540
This American Airlines deal was found by Cheapflights users on 3/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 3/276:00 am
YYZ
- ASE
1 stop8h 49m
American Airlines
mar 3/3112:39 pm
ASE
- YYZ
1 stop8h 00m
American Airlines
Deal found 3/15![American Airlines logo]()
$755
This United Airlines deal was found by Cheapflights users on 3/14. 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.
mar 4/146:10 am
YUL
- COS
1 stop6h 47m
United Airlines
sab 4/1810:28 am
COS
- YUL
2 stops9h 38m
United Airlines
Deal found 3/14![United Airlines logo]()
$411
This United Airlines deal was found by Cheapflights users on 3/13. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 4/156:10 am
YYZ
- COS
2 stops10h 26m
United Airlines
lun 4/201:33 pm
COS
- YYZ
1 stop5h 59m
United Airlines
Deal found 3/13![United Airlines logo]()
$412
This Delta deal was found by Cheapflights users on 3/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 4/206:00 am
YYZ
- DEN
1 stop7h 31m
Delta
mar 4/215:55 pm
DEN
- YYZ
1 stop13h 15m
Delta
Deal found 3/13![Delta logo]()
$460
This Air Canada deal was found by Cheapflights users on 3/12. 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.
gio 4/912:30 pm
YTZ
- DEN
1 stop9h 25m
Air Canada
dom 4/1211:10 am
DEN
- YTZ
1 stop8h 22m
Air Canada
Deal found 3/12![Air Canada logo]()
$504
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 5/14:55 pm
YYZ
- DEN
2 stops21h 11m
Alaska Airlines
lun 5/46:45 am
DEN
- YYZ
2 stops31h 00m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$507
This Delta deal was found by Cheapflights users on 3/16. 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.
mar 4/1412:55 pm
YUL
- COS
2 stops9h 25m
Delta
sab 4/187:59 am
COS
- YUL
2 stops13h 27m
Delta
Deal found 3/16![Delta logo]()
$464
This oojo deal was found by Cheapflights users on 3/12. 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.
dom 7/197:20 pm
YUL
- DEN
2 stops18h 00m
WestJet
dom 7/2612:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 3/12![WestJet logo]()
$520
This Delta deal was found by Cheapflights users on 3/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 3/306:49 pm
YYZ
- DEN
1 stop17h 17m
Delta
lun 4/611:59 pm
DEN
- YYZ
1 stop9h 20m
Delta
Deal found 3/13![Delta logo]()
$468
This Air Canada deal was found by Cheapflights users on 3/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 4/3012:30 pm
YTZ
- DEN
1 stop9h 25m
Air Canada
lun 5/411:25 am
DEN
- YTZ
1 stop6h 27m
Air Canada
Deal found 3/15![Air Canada logo]()
$520
This United Airlines deal was found by Cheapflights users on 3/14. 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.
lun 4/203:53 pm
YYZ
- DEN
1 stop10h 04m
United Airlines
mar 4/219:55 am
DEN
- YYZ
Nonstop3h 19m
United Airlines
Deal found 3/14![United Airlines logo]()
$488
This oojo deal was found by Cheapflights users on 3/13. 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.
dom 5/248:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
mar 5/2612:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 3/13![WestJet logo]()
$586
This Delta deal was found by Cheapflights users on 3/14. 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.
gio 5/216:15 am
YYZ
- DEN
1 stop8h 30m
Delta
lun 5/257:55 am
DEN
- YYZ
1 stop6h 38m
Delta
Deal found 3/14![Delta logo]()
$487
This United Airlines deal was found by Cheapflights users on 3/15. 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.
ven 4/244:18 pm
YYZ
- DEN
Nonstop3h 55m
United Airlines
sab 8/14:40 pm
DEN
- YYZ
1 stop5h 19m
United Airlines
Deal found 3/15![United Airlines logo]()
$488
This Air Canada deal was found by Cheapflights users on 3/14. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 4/2312:30 pm
YTZ
- DEN
1 stop9h 25m
Air Canada
lun 4/2711:10 am
DEN
- YTZ
1 stop8h 22m
Air Canada
Deal found 3/14![Air Canada logo]()
$543
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
lun 5/188:15 am
YHM
- DEN
2 stops26h 52m
Multiple Airlines
mar 5/1912:15 pm
DEN
- YHM
1 stop8h 58m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$679
This Delta deal was found by Cheapflights users on 3/14. 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.
ven 8/217:45 pm
YUL
- DEN
1 stop22h 49m
Delta
sab 8/297:00 am
DEN
- YUL
1 stop23h 43m
Delta
Deal found 3/14![Delta logo]()
$493
This United Airlines deal was found by Cheapflights users on 3/12. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 4/172:20 pm
YUL
- DEN
1 stop9h 55m
United Airlines
mar 4/216:00 am
DEN
- YUL
1 stop11h 45m
United Airlines
Deal found 3/12![United Airlines logo]()
$498
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 4/306:05 am
YKF
- DEN
1 stop31h 15m
Multiple Airlines
gio 5/77:06 pm
DEN
- YKF
2 stops41h 54m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$681
This Air Canada deal was found by Cheapflights users on 3/12. 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.
mer 4/112:30 pm
YTZ
- DEN
1 stop9h 25m
Air Canada
dom 4/511:10 am
DEN
- YTZ
1 stop8h 22m
Air Canada
Deal found 3/12![Air Canada logo]()
$564
This American Airlines deal was found by Cheapflights users on 3/14. 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.
ven 3/276:10 am
YYZ
- ASE
1 stop7h 59m
American Airlines
dom 3/297:00 am
ASE
- YYZ
1 stop13h 39m
American Airlines
Deal found 3/14![American Airlines logo]()
$757
This FlightHub deal was found by Cheapflights users on 3/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 6/128:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
lun 6/1512:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Deal found 3/14![WestJet logo]()
$645
This Delta deal was found by Cheapflights users on 3/15. 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.
ven 4/104:45 pm
YUL
- DEN
1 stop6h 43m
Delta
mar 4/145:55 pm
DEN
- YUL
1 stop12h 45m
Delta
Deal found 3/15![Delta logo]()
$497
This United Airlines deal was found by Cheapflights users on 3/13. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 5/266:35 pm
YUL
- DEN
1 stop7h 55m
United Airlines
lun 6/16:00 am
DEN
- YUL
1 stop8h 10m
United Airlines
Deal found 3/13![United Airlines logo]()
$498
Last-minute flights from Ontario to ColoradoDiscover last-minute flight deals from Ontario to Colorado. Data last updated marzo 17, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Colorado. Data last updated marzo 17, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 3/207:30 am
YUL
- DEN
1 stop7h 49m
American Airlines
mar 3/247:05 am
DEN
- YUL
1 stop13h 51m
American Airlines
Deal found 3/13![American Airlines logo]()
$352
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 4/67:30 am
YUL
- DEN
1 stop16h 06m
American Airlines
lun 4/135:44 pm
DEN
- YUL
1 stop16h 00m
American Airlines
Deal found 3/13![American Airlines logo]()
$345
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 4/68:00 pm
YYZ
- DEN
1 stop9h 59m
Multiple Airlines
gio 4/96:00 am
DEN
- YYZ
1 stop23h 00m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$386
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 4/812:30 pm
YUL
- DEN
2 stops13h 15m
American Airlines
lun 4/136:30 pm
DEN
- YUL
2 stops15h 14m
American Airlines
Deal found 3/13![American Airlines logo]()
$343
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
gio 4/98:00 pm
YYZ
- DEN
1 stop14h 10m
Multiple Airlines
gio 4/166:00 am
DEN
- YYZ
2 stops27h 28m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$381
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 4/107:29 am
YUL
- DEN
1 stop12h 57m
American Airlines
lun 4/135:44 pm
DEN
- YUL
1 stop16h 00m
American Airlines
Deal found 3/13![American Airlines logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
lun 4/139:25 am
YTZ
- DEN
1 stop26h 47m
Multiple Airlines
lun 4/207:35 am
DEN
- YTZ
1 stop27h 35m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 3/15. 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.
mar 4/147:00 am
YYZ
- COS
1 stop5h 57m
United Airlines
sab 4/185:13 pm
COS
- YYZ
2 stops14h 41m
United Airlines
Deal found 3/15![United Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 4/208:00 pm
YYZ
- DEN
1 stop9h 59m
Multiple Airlines
dom 5/1012:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$383
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
gio 4/238:00 pm
YYZ
- DEN
1 stop14h 50m
Multiple Airlines
lun 4/2712:51 pm
DEN
- YYZ
1 stop24h 54m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$374
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
mar 4/289:45 am
YYZ
- DEN
1 stop20h 14m
Multiple Airlines
sab 5/27:54 pm
DEN
- YYZ
2 stops37h 41m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 4/296:30 am
YYZ
- DEN
2 stops17h 59m
Multiple Airlines
mer 5/610:29 pm
DEN
- YYZ
1 stop19h 40m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$378
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 marzo 17, 2026.
Search for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated marzo 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
mer 5/67:00 am
YYZ
- DEN
3 stops19h 09m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
mar 5/510:50 am
YYZ
- DEN
2 stops15h 19m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
lun 4/2710:50 am
YYZ
- DEN
2 stops19h 09m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
lun 4/138:00 pm
YYZ
- DEN
1 stop9h 59m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$170
This American Airlines deal was found by Cheapflights users on 3/12. 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.
mer 4/87:29 am
YUL
- DEN
1 stop15h 12m
American Airlines
Deal found 3/12![American Airlines logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 3/17. 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.
lun 5/1110:50 am
YYZ
- DEN
2 stops18h 35m
Multiple Airlines
Deal found 3/17![Multiple Airlines logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 3/17. 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.
mar 5/1210:50 am
YYZ
- DEN
2 stops15h 19m
Multiple Airlines
Deal found 3/17![Multiple Airlines logo]()
$173
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 5/21:03 pm
YUL
- DEN
1 stop9h 14m
American Airlines
Deal found 3/13![American Airlines logo]()
$175
This American Airlines deal was found by Cheapflights users on 3/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 5/111:03 pm
YUL
- DEN
1 stop11h 44m
American Airlines
Deal found 3/13![American Airlines logo]()
$179
This American Airlines deal was found by Cheapflights users on 3/12. 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.
lun 4/133:45 pm
YUL
- DEN
1 stop8h 14m
American Airlines
Deal found 3/12![American Airlines logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
sab 5/98:50 am
YTZ
- DEN
1 stop17h 02m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
gio 4/98:00 pm
YYZ
- DEN
1 stop14h 10m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$182
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 marzo 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $293 (American Airlines) |
One-way from | $160 (Kiwi.com) |
Popular in | February |
Cheapest in | November |
Average price | $475 |
Good round-trip deal | $442 or less |
Good one-way deal | $303 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 marzo 17, 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
TorontoColorado Springs
YYZ - COS
YYZCOS
Toronto Pearson Intl
mar 4/14
10:45 am-4:32 pm
1 stop7h 47m
Colorado Springs
sab 4/18
1:33 pm-9:32 pm
1 stop5h 59m
$369
MontrealColorado Springs
YUL - COS
YULCOS
Montreal Pierre Elliott Trudeau Intl
mar 4/14
6:10 am-10:57 am
1 stop6h 47m
Colorado Springs
sab 4/18
10:28 am-10:06 pm
2 stops9h 38m
$411
TorontoColorado Springs
YYZ - COS
YYZCOS
Toronto Pearson Intl
mer 4/15
6:10 am-2:36 pm
2 stops10h 26m
Colorado Springs
lun 4/20
1:33 pm-9:32 pm
1 stop5h 59m
$412
MontrealDenver
YUL - DEN
YULDEN
Montreal Pierre Elliott Trudeau Intl
ven 4/17
9:30 am-9:05 pm
1 stop13h 35m
Denver Intl
mar 4/21
7:12 am-6:51 pm
1 stop9h 39m
$446
TorontoDenver
YYZ - DEN
YYZDEN
Toronto Pearson Intl
lun 4/20
6:00 am-11:31 am
1 stop7h 31m
Denver Intl
mar 4/21
5:55 pm-9:10 am
1 stop13h 15m
$460
TorontoDenver
YTZ - DEN
YTZDEN
Toronto Island
mar 5/5
12:30 pm-7:00 pm
1 stop8h 30m
Denver Intl
sab 5/9
11:25 am-9:32 pm
1 stop8h 07m
$463
MontrealColorado Springs
YUL - COS
YULCOS
Montreal Pierre Elliott Trudeau Intl
mar 4/14
12:55 pm-8:20 pm
2 stops9h 25m
Colorado Springs
sab 4/18
7:59 am-11:26 pm
2 stops13h 27m
$464
TorontoDenver
YYZ - DEN
YYZDEN
Toronto Pearson Intl
lun 4/20
4:55 pm-11:56 pm
1 stop9h 01m
Denver Intl
mar 4/21
7:00 am-3:45 pm
1 stop30h 45m
$466
TorontoDenver
YYZ - DEN
YYZDEN
Toronto Pearson Intl
lun 3/30
6:49 pm-10:06 am
1 stop17h 17m
Denver Intl
lun 4/6
11:59 pm-11:19 am
1 stop9h 20m
$468
OttawaDenver
YOW - DEN
YOWDEN
Ottawa
mer 5/20
6:55 am-11:20 am
2 stops30h 25m
Denver Intl
mar 5/26
12:15 pm-12:30 pm
2 stops22h 15m
$484
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.
YUL-DEN
YYZ-COS
YYZ-DEN
YTZ-DEN
YOW-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
YUL-DEN
YYZ-COS
YYZ-DEN
YTZ-DEN
What is the cheapest month to book a flight from Region of Ontario to Colorado?
Currently, September is the cheapest month in which you can book a flight from Region of Ontario to Colorado (average of $218). Flying from Region of Ontario to Colorado in January is currently the most expensive (average of $384). 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 marzo 17, 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 marzo 17, 2026.
The most flights from CAON to USCO are scheduled on a Monday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).
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 marzo 17, 2026.
Peruse reviews from past customers who have flown with United Airlines,WestJet, andAir 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
Entertainment
7.1
Boarding
7.7
Crew
8.1
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Overall
7.4
Comfort
7.3
Food
6.6
Entertainment
7.1
Boarding
7.7
Crew
8.1
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Overall
7.4
Comfort
7.3
Food
6.6
Entertainment
7.1
Boarding
7.7
Crew
8.1
Reviews
1 / 20
6.0
GoodGerry,Jan 2026
YVR - DEN
Overall
7.4
Comfort
7.3
Food
6.6
Entertainment
7.1
Boarding
7.7
Crew
8.1
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
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 marzo 17, 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 marzo 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$218 | Average$597 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$267 | Average$538 | FlexibilityNo cancel fee | On-time67% |