$151+ Cheap flights from Denver (DEN) to Ontario
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Oct 21 — Oct 281
Round-trip
1 adult, Economy
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Find cheap flights from Denver to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Denver to OntarioExplore the most affordable flight options available from Denver to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 21, 2026.
Explore the most affordable flight options available from Denver to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Sat 11/148:55 pm -
1 stop16h 11m
Tue 11/174:35 pm -
1 stop17h 51m
Deal found 9/17![Multiple Airlines logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/158:55 pm -
1 stop15h 30m
Fri 10/231:45 pm -
1 stop20h 34m
Deal found 9/16![Multiple Airlines logo]()
$345
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/310:39 am -
1 stop29h 36m
Tue 11/101:10 pm -
1 stop30h 12m
Deal found 9/19![Multiple Airlines logo]()
$347
This deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/1911:25 am -
1 stop8h 05m
Fri 10/239:30 am -
1 stop11h 16m
Deal found 9/19![Air Canada logo]()
$349
This Mytrip deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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.
Tue 11/32:14 pm -
1 stop14h 50m
Tue 11/108:45 pm -
1 stop14h 22m
Deal found 9/19![Multiple Airlines logo]()
$353
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/158:55 pm -
1 stop15h 30m
Sun 10/1810:10 am -
1 stop24h 09m
Deal found 9/16![Multiple Airlines logo]()
$364
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 11/68:55 pm -
1 stop16h 11m
Mon 11/94:35 pm -
1 stop17h 51m
Deal found 9/18![Multiple Airlines logo]()
$366
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/48:55 pm -
1 stop16h 11m
Wed 11/111:10 pm -
1 stop30h 12m
Deal found 9/20![Multiple Airlines logo]()
$367
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:55 pm -
1 stop13h 45m
Wed 10/216:50 pm -
1 stop15h 29m
Deal found 9/16![Multiple Airlines logo]()
$367
This deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/1911:25 am -
1 stop8h 05m
Sun 10/2510:45 am -
1 stop11h 42m
Deal found 9/19![Air Canada logo]()
$368
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/210:39 am -
1 stop29h 36m
Mon 11/94:35 pm -
1 stop17h 51m
Deal found 9/19![Multiple Airlines logo]()
$369
This Mytrip deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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.
Sat 10/247:02 pm -
1 stop16h 38m
Sat 10/316:30 am -
2 stops17h 02m
Deal found 9/20![Multiple Airlines logo]()
$373
Best flights from Denver to OntarioDiscover carefully curated flight deals from Denver to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 21, 2026.
Discover carefully curated flight deals from Denver to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/48:55 pm -
1 stop16h 11m
Wed 11/111:10 pm -
1 stop30h 12m
Deal found 9/20![Multiple Airlines logo]()
$364
This Flysmarter deal was found by Cheapflights users on 9/16. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1511:25 am -
2 stops8h 05m
Wed 10/2112:30 pm -
1 stop8h 16m
Deal found 9/16![Air Canada logo]()
$485
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/1410:02 am -
Nonstop3h 12m
Sat 10/174:18 pm -
Nonstop3h 38m
Deal found 9/19![United Airlines logo]()
$548
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:15 am -
1 stop9h 43m
Fri 10/3012:44 pm -
1 stop9h 27m
Deal found 9/17![Delta logo]()
$600
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 11/18:55 pm -
1 stop16h 11m
Fri 11/64:35 pm -
1 stop17h 51m
Deal found 9/18![Multiple Airlines logo]()
$398
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/68:55 pm -
1 stop16h 11m
Fri 11/134:15 pm -
2 stops31h 17m
Deal found 9/20![Multiple Airlines logo]()
$401
This FlightHub deal was found by Cheapflights users on 9/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/812:15 pm -
1 stop29h 35m
Sun 10/118:40 pm -
1 stop16h 40m
Deal found 9/16![WestJet logo]()
$922
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Sun 11/19:19 pm -
2 stops20h 40m
Sun 11/84:35 pm -
1 stop17h 51m
Deal found 9/17![Multiple Airlines logo]()
$443
This United Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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.
Sun 10/410:02 am -
Nonstop3h 12m
Fri 10/1610:45 am -
Nonstop3h 38m
Deal found 9/18![United Airlines logo]()
$548
This Air Canada deal was found by Cheapflights users on 9/16. 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.
Sat 10/1711:25 am -
1 stop8h 05m
Tue 10/2012:30 pm -
1 stop8h 16m
Deal found 9/16![Air Canada logo]()
$557
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/74:17 pm -
Nonstop3h 15m
Sat 10/314:10 pm -
Nonstop3h 54m
Deal found 9/17![United Airlines logo]()
$548
This Mytrip deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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.
Tue 11/37:00 pm -
3 stops27h 01m
Tue 11/106:10 am -
3 stops32h 33m
Deal found 9/19![Multiple Airlines logo]()
$456
This Air Canada deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/211:25 am -
1 stop6h 25m
Thu 10/1512:30 pm -
1 stop8h 16m
Deal found 9/18![Air Canada logo]()
$557
This Delta deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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.
Sat 10/36:30 am -
2 stops9h 05m
Mon 10/1912:25 pm -
2 stops13h 19m
Deal found 9/18![Delta logo]()
$636
This United Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/24:17 pm -
Nonstop3h 15m
Tue 10/134:18 pm -
Nonstop3h 38m
Deal found 9/18![United Airlines logo]()
$548
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/3010:29 pm -
2 stops38h 01m
Tue 12/84:35 pm -
1 stop17h 38m
Deal found 9/20![Multiple Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 10/104:17 pm -
Nonstop3h 15m
Mon 10/199:00 pm -
1 stop11h 39m
Deal found 9/20![United Airlines logo]()
$564
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/38:55 pm -
1 stop15h 30m
Sat 10/101:45 pm -
2 stops21h 45m
Deal found 9/19![Multiple Airlines logo]()
$509
This United Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 10/97:33 pm -
1 stop16h 51m
Mon 10/195:15 pm -
1 stop8h 39m
Deal found 9/20![United Airlines logo]()
$573
This FlightHub deal was found by Cheapflights users on 9/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/812:15 pm -
1 stop27h 00m
Sun 10/116:10 pm -
1 stop19h 10m
Deal found 9/16![WestJet logo]()
$938
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/61:05 pm -
2 stops23h 20m
Thu 10/89:15 am -
1 stop12h 48m
Deal found 9/16![Multiple Airlines logo]()
$530
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 12/169:50 am -
Nonstop3h 12m
Sat 1/26:45 am -
1 stop5h 50m
Deal found 9/19![United Airlines logo]()
$606
This Air Canada deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/2211:35 am -
1 stop5h 35m
Mon 10/262:55 pm -
1 stop7h 32m
Deal found 9/19![Air Canada logo]()
$813
This oojo deal was found by Cheapflights users on 9/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:15 pm -
1 stop27h 00m
Sun 10/46:10 pm -
1 stop19h 10m
Deal found 9/16![WestJet logo]()
$960
This United deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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.
Mon 10/54:17 pm -
Nonstop3h 15m
Fri 10/98:50 am -
Nonstop3h 37m
Deal found 9/19![Multiple Airlines logo]()
$548
This United Airlines deal was found by Cheapflights users on 9/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:30 pm -
1 stop7h 36m
Wed 10/149:45 am -
1 stop6h 47m
Deal found 9/16![United Airlines logo]()
$626
This oojo deal was found by Cheapflights users on 9/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:15 pm -
1 stop29h 35m
Sun 10/48:40 pm -
1 stop16h 40m
Deal found 9/16![WestJet logo]()
$980
This United deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/127:45 am -
1 stop7h 02m
Sat 11/148:40 am -
Nonstop3h 55m
Deal found 9/20![Multiple Airlines logo]()
$558
This Air Canada deal was found by Cheapflights users on 9/16. 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.
Thu 10/227:16 pm -
2 stops17h 34m
Mon 10/269:15 am -
2 stops13h 12m
Deal found 9/16![Air Canada logo]()
$937
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/47:45 am -
1 stop7h 45m
Thu 10/86:00 am -
1 stop8h 21m
Deal found 9/17![United Airlines logo]()
$647
Last-minute flights from Denver to OntarioDiscover last-minute flight deals from Denver to Ontario. Data last updated September 21, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to Ontario. Data last updated September 21, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/158:55 pm -
1 stop15h 30m
Fri 10/231:45 pm -
1 stop20h 34m
Deal found 9/16![Multiple Airlines logo]()
$345
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/158:55 pm -
1 stop15h 30m
Sun 10/1810:10 am -
1 stop24h 09m
Deal found 9/16![Multiple Airlines logo]()
$364
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:55 pm -
1 stop13h 45m
Wed 10/216:50 pm -
1 stop15h 29m
Deal found 9/16![Multiple Airlines logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/158:55 pm -
1 stop15h 30m
Wed 10/2110:50 am -
1 stop8h 31m
Deal found 9/16![Multiple Airlines logo]()
$374
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/156:56 pm -
1 stop17h 59m
Mon 10/194:45 pm -
1 stop26h 36m
Deal found 9/19![Multiple Airlines logo]()
$385
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/157:12 am -
2 stops21h 43m
Tue 10/2012:55 pm -
1 stop10h 54m
Deal found 9/19![Multiple Airlines logo]()
$389
This deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/1911:25 am -
1 stop8h 05m
Fri 10/239:30 am -
1 stop11h 16m
Deal found 9/19![Air Canada logo]()
$349
This deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 10/1911:25 am -
1 stop8h 05m
Sun 10/2510:45 am -
1 stop11h 42m
Deal found 9/19![Air Canada logo]()
$368
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/238:55 pm -
1 stop15h 30m
Wed 10/281:10 pm -
1 stop30h 12m
Deal found 9/18![Multiple Airlines logo]()
$382
This Mytrip deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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.
Sat 10/247:02 pm -
1 stop16h 38m
Sat 10/316:30 am -
2 stops17h 02m
Deal found 9/20![Multiple Airlines logo]()
$373
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/268:55 pm -
1 stop16h 11m
Thu 10/294:35 pm -
1 stop17h 51m
Deal found 9/18![Multiple Airlines logo]()
$387
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/2610:44 pm -
2 stops36h 06m
Thu 10/291:40 pm -
1 stop10h 08m
Deal found 9/18![Multiple Airlines logo]()
$396
One-way flights from Denver to OntarioSearch for one-way flight options from Denver to Ontario. Find affordable one-way fares based on user searches. Data last updated September 21, 2026.
Search for one-way flight options from Denver to Ontario. Find affordable one-way fares based on user searches. Data last updated September 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 12/158:59 am -
1 stop7h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Multiple Airlines logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/49:12 pm -
2 stops40h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Multiple Airlines logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 11/210:39 am -
1 stop29h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Multiple Airlines logo]()
$153
This Trip.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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.
Mon 10/58:55 pm -
1 stop15h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Multiple Airlines logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Fri 10/162:10 pm -
2 stops13h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Multiple Airlines logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/1510:44 pm -
2 stops30h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Wed 10/1410:44 pm -
2 stops30h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$168
This Trip.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 11/48:55 pm -
1 stop22h 11m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Multiple Airlines logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Fri 11/279:26 pm -
1 stop15h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Multiple Airlines logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/136:16 pm -
2 stops41h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Multiple Airlines logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/74:14 pm -
1 stop27h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Multiple Airlines logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Tue 10/202:10 pm -
3 stops32h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Multiple Airlines logo]()
$175
Find flight deals from Denver to Ontario
Keep the following information in mind while searching for Denver to Ontario flight deals. Data was last updated September 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $330 (Kiwi.com) |
One-way from | $151 (Kiwi.com) |
Popular in | February |
Cheapest in | October |
Average price | $653 |
Good round-trip deal | $594 or less |
Good one-way deal | $210 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Denver 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 7,457,451 searches. Data last updated September 21, 2026.
Use the filters below to find and compare flights from Denver to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverToronto
DEN Denver Intl - YTZ Toronto Island
DENYTZ
Denver Intl
Tue 12/15
8:59 am-6:15 pm
1 stop7h 16m
Toronto Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$151
DenverToronto
DEN Denver Intl - YYZ Toronto Pearson Intl
DENYYZ
Denver Intl
Tue 12/15
9:08 am-5:40 pm
1 stop30h 32m
Toronto Pearson Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$159
DenverOttawa
DEN Denver Intl - YOW Ottawa
DENYOW
Denver Intl
Fri 10/16
2:10 pm-5:35 am
2 stops13h 25m
Ottawa
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$166
DenverToronto
DEN Denver Intl - YTZ Toronto Island
DENYTZ
Denver Intl
Thu 11/5
8:55 pm-9:06 pm
1 stop22h 11m
Toronto Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$171
DenverMontreal
DEN Denver Intl - YUL Montreal Pierre Elliott Trudeau Intl
DENYUL
Denver Intl
Thu 10/15
10:44 pm-7:05 am
2 stops30h 21m
Montreal Pierre Elliott Trudeau Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$188
DenverToronto
DEN Denver Intl - YTZ Toronto Island
DENYTZ
Denver Intl
Mon 11/2
9:19 pm-12:52 pm
3 stops37h 33m
Toronto Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$190
DenverToronto
DEN Denver Intl - YTZ Toronto Island
DENYTZ
Denver Intl
Tue 12/1
6:59 pm-3:06 pm
2 stops18h 07m
Toronto Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$196
DenverOttawa
DEN Denver Intl - YOW Ottawa
DENYOW
Denver Intl
Tue 10/6
10:47 pm-5:58 pm
2 stops41h 11m
Ottawa
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$196
DenverMontreal
DEN Denver Intl - YUL Montreal Pierre Elliott Trudeau Intl
DENYUL
Denver Intl
Tue 11/17
6:31 pm-10:20 pm
3 stops25h 49m
Montreal Pierre Elliott Trudeau Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$209
DenverToronto
DEN Denver Intl - YYZ Toronto Pearson Intl
DENYYZ
Denver Intl
Wed 10/21
8:00 am-11:29 pm
1 stop13h 29m
Toronto Pearson Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$226
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Denver to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Denver with our price prediction graph.
DEN-YTZ
DEN-YYZ
DEN-YUL
DEN-YHM
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 Denver to Ontario
DEN-CAON
DEN-YTZ
DEN-YYZ
DEN-YUL
DEN-YHM
What is the cheapest month to book a flight from Denver to Region of Ontario?
Currently, November is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of $554). Flying from Denver to Region of Ontario in February is currently the most expensive (average of $686). 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 DEN to ON?
Find hourly flight availability from Denver 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 September 21, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Denver to Region of Ontario as you normally would.
Weekly flight availability from Denver to Region of Ontario
Explore weekly flight availability from Denver 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 September 21, 2026.
The most flights from DEN to CAON are scheduled on a Saturday (9 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Denver to Region of Ontario?
Airfare is below average for this route at the moment.
Denver to Region of Ontario flights typically cost between $388 and $773 in November.The cheapest round-trip price found within the last 5 days was $353 on Multiple Airlines (Nov 3-Nov 10).
How far ahead should I book a flight from Denver to Region of Ontario?
The best time to book flights from Denver to Region of Ontario is 63 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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 September 21, 2026.
Read reviews from past customers who have flown United Airlines and Air Canada from Denver to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.4
Boarding
7.7
Food
6.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentMichelle,Dec 2025
DEN - MKE
Overall
7.4
Boarding
7.7
Food
6.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentMichelle,Dec 2025
DEN - MKE
Overall
7.4
Boarding
7.7
Food
6.7
Comfort
7.3
Entertainment
7.1
Crew
8.1
Reviews
1 / 20
10.0
ExcellentMichelle,Dec 2025
DEN - MKE
Related info for your journey
Find useful and relevant information for your journey from Denver 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 Denver to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Denver to Ontario by cabin class
Find flights from Denver to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Denver and Ontario flights
Browse other Denver and Ontario flight options. Last updated on September 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Denver to Ontario
Discover the top 2 airlines that operate flights from Denver 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 7,457,451 searches. Data last updated September 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$222 | Average$694 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$268 | Average$766 | FlexibilityNo cancel fee | On-time69% |