$161+ Cheap flights from Colorado to Ontario
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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Jul 15 — Jul 221
Round-trip
1 adult, Economy
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Cheapest flights from Colorado to OntarioExplore the most affordable flight options available from Colorado to Ontario. 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 Colorado to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 15, 2026.
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 9/165:56 pm
DEN
- YTZ
1 stop18h 29m
Multiple Airlines
Sat 9/191:40 pm
YTZ
- DEN
1 stop12h 49m
Multiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$332
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.
Tue 10/66:25 am
DEN
- YTZ
1 stop9h 35m
Multiple Airlines
Sat 10/101:40 pm
YTZ
- DEN
1 stop25h 20m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$345
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.
Sat 9/55:15 pm
DEN
- YTZ
1 stop19h 10m
Multiple Airlines
Tue 9/88:40 pm
YTZ
- DEN
1 stop18h 20m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$352
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 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Tue 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$356
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.
Thu 10/16:25 am
DEN
- YTZ
1 stop6h 00m
Multiple Airlines
Sun 10/41:40 pm
YTZ
- DEN
1 stop12h 49m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$358
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.
Thu 8/206:00 am
DEN
- YYZ
1 stop12h 50m
Multiple Airlines
Mon 8/2412:55 pm
YYZ
- DEN
1 stop24h 37m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$373
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.
Fri 7/3110:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Tue 8/410:50 am
YYZ
- DEN
2 stops19h 00m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$374
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.
Fri 9/185:56 pm
DEN
- YTZ
1 stop13h 44m
Multiple Airlines
Mon 9/218:40 pm
YTZ
- DEN
1 stop18h 20m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$376
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 8/128:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Tue 8/1812:55 pm
YYZ
- DEN
1 stop10h 54m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$379
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 9/145:56 pm
DEN
- YTZ
1 stop13h 44m
Multiple Airlines
Fri 9/188:40 pm
YTZ
- DEN
1 stop18h 20m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$381
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 8/193:50 pm
DEN
- YYZ
1 stop27h 00m
Multiple Airlines
Sun 8/3012:55 pm
YYZ
- DEN
1 stop10h 54m
Multiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$384
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 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Wed 7/297:00 am
YYZ
- DEN
2 stops13h 00m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$388
Best flights from Colorado to OntarioDiscover carefully curated flight deals from Colorado to Ontario 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 Colorado to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 15, 2026.
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.
Fri 9/185:56 pm
DEN
- YTZ
1 stop13h 44m
Multiple Airlines
Mon 9/218:40 pm
YTZ
- DEN
1 stop18h 20m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$376
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/2412:15 pm
DEN
- YOW
2 stops22h 15m
WestJet
Tue 7/287:20 am
YOW
- DEN
1 stop30h 00m
WestJet
Deal found 6/12![WestJet logo]()
$470
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 10/210:02 am
DEN
- YYZ
Nonstop3h 12m
United Airlines
Mon 10/54:18 pm
YYZ
- DEN
Nonstop3h 38m
United Airlines
Deal found 6/14![United Airlines logo]()
$514
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.
Mon 11/912:00 pm
DEN
- YYZ
1 stop7h 58m
Delta
Mon 11/1612:05 pm
YYZ
- DEN
1 stop10h 26m
Delta
Deal found 6/11![Delta logo]()
$528
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.
Wed 8/512:36 pm
COS
- YYZ
1 stop8h 53m
American Airlines
Sat 8/156:28 pm
YYZ
- COS
1 stop6h 25m
American Airlines
Deal found 6/12![American Airlines logo]()
$533
This Vliegwinkel 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/29:40 am
DEN
- YTZ
1 stop8h 11m
Air Canada
Fri 7/108:30 pm
YTZ
- DEN
1 stop16h 03m
Air Canada
Deal found 6/10![Air Canada logo]()
$547
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2212:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Tue 7/288:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/10![WestJet logo]()
$491
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/54:16 pm
DEN
- YYZ
Nonstop3h 16m
United Airlines
Tue 9/810:45 am
YYZ
- DEN
Nonstop3h 43m
United Airlines
Deal found 6/12![United Airlines logo]()
$514
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.
Fri 9/187:31 pm
DEN
- YYZ
1 stop16h 53m
Multiple Airlines
Mon 9/216:40 pm
YYZ
- DEN
Nonstop3h 37m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$524
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.
Sun 8/212:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Wed 8/58:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/11![WestJet logo]()
$492
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.
Sat 6/271:30 pm
COS
- YYZ
1 stop6h 02m
United Airlines
Mon 6/297:00 am
YYZ
- COS
1 stop6h 09m
United Airlines
Deal found 6/10![United Airlines logo]()
$522
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.
Thu 9/2411:52 pm
DEN
- YYZ
1 stop8h 12m
Multiple Airlines
Mon 9/288:45 am
YYZ
- DEN
Nonstop3h 37m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$524
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.
Mon 7/206:00 am
COS
- YYZ
1 stop9h 19m
Delta
Mon 7/2711:40 am
YYZ
- COS
1 stop11h 27m
Delta
Deal found 6/15![Delta logo]()
$577
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/203:51 pm
COS
- YUL
1 stop20h 53m
American Airlines
Tue 8/2510:31 am
YUL
- COS
2 stops14h 22m
American Airlines
Deal found 6/10![American Airlines logo]()
$585
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1812:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Tue 7/288:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/10![WestJet logo]()
$492
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:00 am
DEN
- YYZ
1 stop6h 19m
United Airlines
Sun 10/410:45 am
YYZ
- DEN
Nonstop3h 38m
United Airlines
Deal found 6/12![United Airlines logo]()
$524
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/21:19 pm
COS
- YYZ
1 stop6h 40m
Delta
Fri 10/91:30 pm
YYZ
- COS
1 stop9h 51m
Delta
Deal found 6/12![Delta logo]()
$579
This Justfly.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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/2412:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Mon 7/276:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Deal found 6/10![WestJet logo]()
$497
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.
Fri 7/312:40 pm
DEN
- YYZ
1 stop7h 43m
Multiple Airlines
Sun 7/58:55 am
YYZ
- DEN
Nonstop3h 40m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$550
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.
Tue 9/159:30 am
DEN
- YUL
2 stops12h 27m
Delta
Sat 9/196:00 am
YUL
- DEN
2 stops13h 16m
Delta
Deal found 6/10![Delta logo]()
$581
This United Airlines 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/294:15 pm
DEN
- YYZ
Nonstop3h 17m
United Airlines
Fri 8/74:18 pm
YYZ
- DEN
Nonstop3h 45m
United Airlines
Deal found 6/13![United Airlines logo]()
$540
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/412:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Sun 10/116:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Deal found 6/12![WestJet logo]()
$498
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.
Fri 9/45:13 pm
COS
- YUL
2 stops17h 14m
American Airlines
Fri 9/1110:30 am
YUL
- COS
2 stops14h 25m
American Airlines
Deal found 6/14![American Airlines logo]()
$667
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 7/912:15 pm
DEN
- YOW
2 stops22h 15m
Multiple Airlines
Thu 7/164:00 pm
YOW
- DEN
3 stops21h 20m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$584
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2211:10 am
COS
- YUL
1 stop10h 30m
Delta
Wed 7/2912:44 pm
YUL
- COS
1 stop10h 23m
Delta
Deal found 6/12![Delta logo]()
$587
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.
Tue 8/1111:59 pm
DEN
- YYZ
1 stop7h 20m
United Airlines
Wed 8/1212:45 pm
YYZ
- DEN
1 stop13h 45m
United Airlines
Deal found 6/14![United Airlines logo]()
$541
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1611:25 am
DEN
- YXU
2 stops8h 15m
Air Canada
Tue 10/205:40 am
YXU
- DEN
1 stop6h 42m
Air Canada
Deal found 6/11![Air Canada logo]()
$804
This WestJet 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/712:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Sat 8/158:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/13![WestJet logo]()
$507
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/63:46 pm
COS
- YUL
2 stops17h 57m
American Airlines
Sat 7/113:48 pm
YUL
- COS
1 stop8h 35m
American Airlines
Deal found 6/15![American Airlines logo]()
$707
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.
Wed 7/84:29 pm
DEN
- YYZ
1 stop5h 30m
United Airlines
Wed 7/154:18 pm
YYZ
- DEN
Nonstop3h 45m
United Airlines
Deal found 6/14![United Airlines logo]()
$550
Last-minute flights from Colorado to OntarioDiscover last-minute flight deals from Colorado to Ontario. Data last updated June 15, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Ontario. Data last updated June 15, 2026 and is based on user searches.
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.
Tue 7/75:05 pm
DEN
- YTZ
1 stop18h 00m
Multiple Airlines
Tue 7/141:40 pm
YTZ
- DEN
2 stops21h 23m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$411
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.
Tue 7/144:25 pm
DEN
- YYZ
2 stops34h 45m
Multiple Airlines
Tue 7/2112:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$398
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 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Tue 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$356
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 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Wed 7/297:00 am
YYZ
- DEN
2 stops13h 00m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$388
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 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Wed 8/52:30 pm
YYZ
- DEN
2 stops22h 50m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$399
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2212:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Tue 7/287:15 am
YUL
- DEN
1 stop30h 05m
WestJet
Deal found 6/13![WestJet logo]()
$437
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 7/2212:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Mon 7/278:00 pm
YUL
- DEN
1 stop17h 20m
WestJet
Deal found 6/10![WestJet logo]()
$440
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.
Fri 7/2412:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Tue 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$389
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.
Tue 7/2812:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Tue 8/48:00 pm
YUL
- DEN
1 stop17h 20m
WestJet
Deal found 6/10![WestJet logo]()
$438
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.
Thu 7/308:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Mon 8/34:45 pm
YYZ
- DEN
1 stop23h 38m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$405
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.
Fri 7/3110:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Tue 8/410:50 am
YYZ
- DEN
2 stops19h 00m
Multiple Airlines
Deal found 6/11![Multiple Airlines 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.
Fri 7/3110:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Fri 8/73:50 pm
YYZ
- DEN
2 stops14h 00m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$401
One-way flights from Colorado to OntarioSearch for one-way flight options from Colorado to Ontario. Find affordable one-way fares based on user searches. Data last updated June 15, 2026.
Search for one-way flight options from Colorado to Ontario. Find affordable one-way fares based on user searches. Data last updated June 15, 2026.
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 9/210:25 am
DEN
- YYZ
3 stops35h 34m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$161
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 8/193:50 pm
DEN
- YYZ
1 stop27h 00m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$162
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.
Tue 8/1810:29 pm
DEN
- YYZ
2 stops24h 36m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$171
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.
Fri 7/1010:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$173
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.
Fri 7/2410:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$176
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.
Mon 8/1710:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$179
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.
Tue 8/118:01 am
DEN
- YTZ
1 stop5h 59m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$180
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.
Wed 9/26:56 am
DEN
- YYZ
1 stop9h 34m
American Airlines
Deal found 6/12![American Airlines logo]()
$180
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.
Tue 8/187:23 am
DEN
- YTZ
1 stop6h 37m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$183
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 8/197:23 am
DEN
- YTZ
1 stop6h 37m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$184
This Justfly.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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/15![WestJet logo]()
$185
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2712:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/13![WestJet logo]()
$186
Find flight deals from Colorado to Ontario
Keep the following information in mind while searching for Colorado to Ontario flight deals. Data was last updated June 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $352 (Kiwi.com) |
One-way from | $161 (Kiwi.com) |
Popular in | February |
Cheapest in | August |
Average price | $576 |
Good round-trip deal | $675 or less |
Good one-way deal | $296 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Colorado to Ontario 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 Colorado to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverToronto
DEN - YTZ
DENYTZ
Denver Intl
Fri 9/18
5:56 pm-9:40 am
1 stop13h 44m
Toronto Island
Mon 9/21
8:40 pm-1:00 pm
1 stop18h 20m
$376
DenverOttawa
DEN - YOW
DENYOW
Denver Intl
Fri 7/24
12:15 pm-12:30 pm
2 stops22h 15m
Ottawa
Tue 7/28
7:20 am-11:20 am
1 stop30h 00m
$470
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Wed 7/22
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Tue 7/28
8:40 pm-11:20 am
1 stop16h 40m
$491
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Sun 8/2
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Wed 8/5
8:40 pm-11:20 am
1 stop16h 40m
$492
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Sat 7/18
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Tue 7/28
8:40 pm-11:20 am
1 stop16h 40m
$492
DenverHamilton
DEN - YHM
DENYHM
Denver Intl
Fri 7/24
12:15 pm-5:15 pm
1 stop27h 00m
Hamilton
Mon 7/27
6:10 pm-11:20 am
1 stop19h 10m
$497
DenverHamilton
DEN - YHM
DENYHM
Denver Intl
Sun 10/4
12:15 pm-5:15 pm
1 stop27h 00m
Hamilton
Sun 10/11
6:10 pm-11:20 am
1 stop19h 10m
$498
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Fri 8/7
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Sat 8/15
8:40 pm-11:20 am
1 stop16h 40m
$507
Quickest round-trip
DenverToronto
DEN - YYZ
DENYYZ
Denver Intl
Fri 10/2
10:02 am-3:14 pm
Nonstop3h 12m
Toronto Pearson Intl
Mon 10/5
4:18 pm-5:56 pm
Nonstop3h 38m
$514
DenverToronto
DEN - YYZ
DENYYZ
Denver Intl
Sat 9/5
4:16 pm-9:32 pm
Nonstop3h 16m
Toronto Pearson Intl
Tue 9/8
10:45 am-12:28 pm
Nonstop3h 43m
$514
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Colorado to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Colorado with our price prediction graph.
DEN-YTZ
DEN-YUL
DEN-YYZ
COS-YYZ
COS-YUL
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 Colorado to Ontario
USCO-CAON
DEN-YTZ
DEN-YUL
DEN-YYZ
COS-YYZ
What is the cheapest month to book a flight from Colorado to Region of Ontario?
Currently, July is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $119). Flying from Colorado to Region of Ontario in May is currently the most expensive (average of $244). 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 CO to ON?
Find hourly flight availability from Colorado to Ontario. 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.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Region of Ontario as you normally would.
Weekly flight availability from Colorado to Region of Ontario
Explore weekly flight availability from Colorado to Ontario. 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 USCO to CAON 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 Colorado to Region of Ontario?
How far ahead should I book a flight from Colorado to Region of Ontario?
Booking 67 days in advance of your planned departure date is, on average, the best time to get cheap flights from Colorado to Region of Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated June 15, 2026.
See what other customers who have flown with Delta,United Airlines, andWestJet from Colorado to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.2
Comfort
7.8
Entertainment
7.8
Overall
7.9
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Food
7.2
Comfort
7.8
Entertainment
7.8
Overall
7.9
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Food
7.2
Comfort
7.8
Entertainment
7.8
Overall
7.9
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Food
7.2
Comfort
7.8
Entertainment
7.8
Overall
7.9
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Food
7.2
Comfort
7.8
Entertainment
7.8
Overall
7.9
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
Find useful and relevant information for your journey from Colorado to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Colorado to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Colorado to Ontario by cabin class
Find flights from Colorado to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Colorado and Ontario flights
Browse other Colorado and Ontario 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 Ontario
Find the right flight back to Colorado after your stay in Ontario
Colorado to Ontario flights
Consider these flights traveling from Colorado to Ontario.
Top 4 airlines flying from Colorado to Ontario
Discover the top 4 airlines that operate flights from Colorado to Ontario. 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$195 | Average$564 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$199 | Average$593 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$218 | Average$488 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$223 | Average$382 | FlexibilityNo cancel fee | On-time60% |