$92+ 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 5/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
May 30 — Jun 61
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 April 30, 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 April 30, 2026.
This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1012:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Tue 5/1210:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/26![WestJet logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1112:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Tue 5/197:00 am
YYZ
- DEN
2 stops19h 09m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$267
This Justfly.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1512:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Tue 5/1910:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/28![WestJet logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Tue 5/1910:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/27![WestJet logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/412:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Mon 6/810:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/28![WestJet logo]()
$283
This Trip.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1612:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Fri 6/1910:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/29![WestJet logo]()
$285
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1512:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Sun 5/175:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Deal found 4/28![WestJet logo]()
$286
This Trip.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/212:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Sat 6/610:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/28![WestJet logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/612:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Tue 6/910:20 pm
YYZ
- DEN
2 stops15h 00m
WestJet
Deal found 4/27![WestJet logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1712:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Tue 5/266:30 am
YYZ
- DEN
2 stops28h 35m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$290
This Trip.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/912:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Tue 6/1610:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/25![WestJet logo]()
$291
This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/212:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Tue 6/163:50 pm
YYZ
- DEN
1 stop21h 30m
WestJet
Deal found 4/26![WestJet logo]()
$292
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 April 30, 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 April 30, 2026.
This FlightHub deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1512:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Fri 5/226:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Deal found 4/27![WestJet logo]()
$423
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/151:40 pm
COS
- YYZ
1 stop6h 19m
Delta
Fri 6/195:45 pm
YYZ
- COS
1 stop6h 57m
Delta
Deal found 4/28![Delta logo]()
$439
This United Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/2012:56 pm
COS
- YYZ
2 stops9h 03m
United Airlines
Tue 6/2310:45 am
YYZ
- COS
1 stop5h 55m
United Airlines
Deal found 4/26![United Airlines logo]()
$449
This Kiwi.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:43 am
DEN
- YTZ
1 stop6h 17m
Multiple Airlines
Sun 7/1210:50 am
YTZ
- DEN
1 stop29h 25m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$500
This American Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:35 am
COS
- YUL
1 stop7h 09m
American Airlines
Sat 6/61:03 pm
YUL
- COS
2 stops11h 21m
American Airlines
Deal found 4/26![American Airlines logo]()
$501
This Air Canada deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1411:30 am
DEN
- YYZ
Nonstop3h 13m
Air Canada
Tue 5/196:40 pm
YYZ
- DEN
Nonstop3h 48m
Air Canada
Deal found 4/29![Air Canada logo]()
$571
This Justfly.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2812:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Thu 6/48:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/29![WestJet logo]()
$423
This Delta deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/136:00 am
COS
- YYZ
1 stop9h 15m
Delta
Sat 5/165:45 pm
YYZ
- COS
1 stop6h 37m
Delta
Deal found 4/26![Delta logo]()
$439
This FlightHub deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/912:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Sat 6/208:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/28![WestJet logo]()
$442
This Mytrip deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1712:15 pm
DEN
- YHM
1 stop9h 03m
Multiple Airlines
Tue 5/267:55 pm
YHM
- DEN
3 stops29h 15m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$537
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/156:55 am
DEN
- YYZ
1 stop8h 49m
American Airlines
Tue 6/3011:39 am
YYZ
- DEN
1 stop14h 38m
American Airlines
Deal found 4/29![American Airlines logo]()
$539
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/246:32 pm
COS
- YUL
2 stops20h 58m
United Airlines
Wed 8/266:10 am
YUL
- COS
1 stop6h 49m
United Airlines
Deal found 4/27![United Airlines logo]()
$542
This oojo deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/2512:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Tue 6/308:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/29![WestJet logo]()
$450
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
COS
- YUL
2 stops15h 13m
Delta
Sat 6/612:40 pm
YUL
- COS
2 stops11h 42m
Delta
Deal found 4/28![Delta logo]()
$506
This Air Canada deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/156:10 pm
DEN
- YYZ
Nonstop3h 13m
Air Canada
Tue 6/306:40 pm
YYZ
- DEN
Nonstop3h 42m
Air Canada
Deal found 4/29![Air Canada logo]()
$575
This Kiwi.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/176:45 am
DEN
- YOW
2 stops15h 55m
Multiple Airlines
Mon 7/208:15 pm
YOW
- DEN
1 stop17h 05m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$538
This Gotogate deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/2512:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Mon 6/298:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/26![WestJet logo]()
$452
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/225:30 am
COS
- YUL
2 stops8h 40m
United Airlines
Wed 9/233:25 pm
YUL
- COS
2 stops10h 24m
United Airlines
Deal found 4/28![United Airlines logo]()
$547
This Delta deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/316:05 am
DEN
- YOW
2 stops9h 30m
Delta
Sun 6/712:25 pm
YOW
- DEN
2 stops13h 06m
Delta
Deal found 4/26![Delta logo]()
$524
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/146:10 am
DEN
- YYZ
1 stop14h 45m
American Airlines
Tue 5/193:13 pm
YYZ
- DEN
1 stop9h 32m
American Airlines
Deal found 4/29![American Airlines logo]()
$586
This Mytrip deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2812:15 pm
DEN
- YHM
1 stop27h 00m
Multiple Airlines
Thu 6/45:45 pm
YHM
- DEN
2 stops19h 35m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$540
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2512:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Mon 6/16:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Deal found 4/25![WestJet logo]()
$453
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/99:05 pm
DEN
- YTZ
1 stop11h 01m
United Airlines
Tue 6/167:20 pm
YTZ
- DEN
1 stop13h 22m
United Airlines
Deal found 4/28![United Airlines logo]()
$587
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:05 am
DEN
- YOW
2 stops9h 30m
Delta
Fri 5/156:55 am
YOW
- DEN
2 stops15h 20m
Delta
Deal found 4/28![Delta logo]()
$538
This oojo deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/912:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Tue 6/168:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/25![WestJet logo]()
$453
This deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2711:25 am
DEN
- YTZ
1 stop8h 06m
Air Canada
Mon 8/312:30 pm
YTZ
- DEN
1 stop8h 30m
Air Canada
Deal found 4/29![Air Canada logo]()
$691
This CheapOair deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2310:34 pm
DEN
- YUL
1 stop17h 41m
Multiple Airlines
Tue 6/27:20 pm
YUL
- DEN
2 stops18h 00m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$576
This Delta deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/512:25 pm
DEN
- YOW
2 stops9h 55m
Delta
Sun 6/712:25 pm
YOW
- DEN
2 stops13h 06m
Delta
Deal found 4/26![Delta logo]()
$544
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/93:50 pm
DEN
- YUL
1 stop6h 23m
United Airlines
Tue 6/163:25 pm
YUL
- DEN
1 stop10h 03m
United Airlines
Deal found 4/25![United Airlines logo]()
$605
This WestJet deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1612:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Thu 6/188:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 4/29![WestJet logo]()
$455
Last-minute flights from Colorado to OntarioDiscover last-minute flight deals from Colorado to Ontario. Data last updated April 30, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to Ontario. Data last updated April 30, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1012:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Tue 5/1210:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/26![WestJet logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1112:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Tue 5/197:00 am
YYZ
- DEN
2 stops19h 09m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$267
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Tue 5/1910:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/27![WestJet logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1312:15 pm
DEN
- YYZ
1 stop10h 50m
WestJet
Sat 5/1610:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/27![WestJet logo]()
$293
This FlightHub deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1512:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Tue 5/1910:25 pm
YYZ
- DEN
1 stop14h 55m
WestJet
Deal found 4/29![WestJet logo]()
$277
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1512:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Sun 5/175:20 pm
YYZ
- DEN
2 stops20h 00m
WestJet
Deal found 4/28![WestJet logo]()
$286
This oojo deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1512:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Mon 5/186:10 am
YYZ
- DEN
2 stops31h 10m
WestJet
Deal found 4/26![WestJet logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1712:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Tue 5/266:30 am
YYZ
- DEN
2 stops28h 35m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1712:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Thu 5/218:00 pm
YUL
- DEN
1 stop17h 20m
WestJet
Deal found 4/26![WestJet logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2512:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Wed 5/274:45 pm
YYZ
- DEN
1 stop6h 44m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2512:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Fri 5/2912:40 pm
YYZ
- DEN
2 stops13h 29m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2512:15 pm
DEN
- YYZ
1 stop8h 30m
Multiple Airlines
Mon 6/14:45 pm
YYZ
- DEN
1 stop7h 52m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$299
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 April 30, 2026.
Search for one-way flight options from Colorado to Ontario. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
This Trip.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2712:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 4/29![WestJet logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2612:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 4/29![WestJet logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/212:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Deal found 4/28![WestJet logo]()
$107
This Justfly.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/412:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Deal found 4/29![WestJet logo]()
$111
This Justfly.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/2312:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Deal found 4/27![WestJet logo]()
$119
This Justfly.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 4/28![WestJet logo]()
$127
This FlightHub deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2012:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 4/28![WestJet logo]()
$130
This eDestinos deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/212:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 4/25![WestJet logo]()
$131
This Trip.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/312:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Deal found 4/25![WestJet logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2212:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/26![WestJet logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/294:54 pm
DEN
- YTZ
1 stop18h 16m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$144
This Mytrip deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2312:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 4/25![WestJet logo]()
$150
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 April 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $258 (Trip.com) |
One-way from | $92 (Trip.com) |
Popular in | February |
Cheapest in | September |
Average price | $600 |
Good round-trip deal | $648 or less |
Good one-way deal | $354 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 April 30, 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
DenverHamilton
DEN - YHM
DENYHM
Denver Intl
Fri 5/15
12:15 pm-5:15 pm
1 stop27h 00m
Hamilton
Fri 5/22
6:10 pm-11:20 am
1 stop19h 10m
$423
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Thu 5/28
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Thu 6/4
8:40 pm-11:20 am
1 stop16h 40m
$423
Colorado SpringsToronto
COS - YYZ
COSYYZ
Colorado Springs
Mon 6/15
1:40 pm-9:59 pm
1 stop6h 19m
Toronto Pearson Intl
Fri 6/19
5:45 pm-10:42 pm
1 stop6h 57m
$439
Colorado SpringsToronto
COS - YYZ
COSYYZ
Colorado Springs
Wed 5/13
6:00 am-5:15 pm
1 stop9h 15m
Toronto Pearson Intl
Sat 5/16
5:45 pm-10:22 pm
1 stop6h 37m
$439
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Tue 6/9
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Sat 6/20
8:40 pm-11:20 am
1 stop16h 40m
$442
Colorado SpringsToronto
COS - YYZ
COSYYZ
Colorado Springs
Sat 6/20
12:56 pm-11:59 pm
2 stops9h 03m
Toronto Pearson Intl
Tue 6/23
10:45 am-2:40 pm
1 stop5h 55m
$449
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Thu 6/25
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Tue 6/30
8:40 pm-11:20 am
1 stop16h 40m
$450
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Thu 6/25
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Mon 6/29
8:40 pm-11:20 am
1 stop16h 40m
$452
DenverHamilton
DEN - YHM
DENYHM
Denver Intl
Mon 5/25
12:15 pm-5:15 pm
1 stop27h 00m
Hamilton
Mon 6/1
6:10 pm-11:20 am
1 stop19h 10m
$453
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Tue 6/9
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Tue 6/16
8:40 pm-11:20 am
1 stop16h 40m
$453
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-YYZ
COS-YYZ
COS-YUL
DEN-YUL
DEN-YOW
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-YYZ
COS-YYZ
COS-YUL
DEN-YUL
How far ahead should I book a flight from Colorado to Region of Ontario?
Booking 42 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.
What is the cheapest month to book a flight from Colorado to Region of Ontario?
Currently, May is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $108). Flying from Colorado to Region of Ontario in April is currently the most expensive (average of $236). 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 April 30, 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 April 30, 2026.
The most flights from USCO to CAON are scheduled on a Thursday (9 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from Colorado to Region of Ontario?
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 April 30, 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.
Boarding
8.1
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Overall
7.9
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
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 April 30, 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 3 airlines flying from Colorado to Ontario
Discover the top 3 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 April 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$177 | Average$536 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$186 | Average$516 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$223 | Average$358 | FlexibilityNo cancel fee | On-time60% |