$126+ 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Oct 5 — Oct 121
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 5, 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 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/198:10 am -
1 stop11h 45m
Mon 10/261:00 pm -
1 stop30h 22m
Deal found 9/4![Multiple Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/2810:38 am -
1 stop9h 17m
Wed 9/304:45 pm -
1 stop26h 31m
Deal found 9/1![Multiple Airlines logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/2010:38 am -
1 stop27h 22m
Sat 10/2410:50 am -
1 stop8h 31m
Deal found 9/2![Multiple Airlines logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/2010:38 am -
1 stop27h 22m
Sun 11/11:10 pm -
1 stop30h 12m
Deal found 9/2![Multiple Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/1512:15 pm -
1 stop8h 30m
Mon 10/194:45 pm -
1 stop26h 36m
Deal found 9/4![Multiple Airlines logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 9/246:40 am -
2 stops13h 15m
Wed 9/304:45 pm -
1 stop26h 31m
Deal found 9/2![Multiple Airlines logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/2810:38 am -
1 stop9h 17m
Tue 9/2912:55 pm -
1 stop10h 54m
Deal found 9/1![Multiple Airlines logo]()
$343
This Trip.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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.
Thu 9/1012:15 pm -
1 stop29h 35m
Sun 9/138:40 pm -
1 stop16h 40m
Deal found 9/1![WestJet logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 10/206:57 pm -
2 stops19h 58m
Sun 10/251:00 pm -
1 stop30h 21m
Deal found 9/3![Multiple Airlines logo]()
$349
This Trip.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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.
Thu 10/1512:15 pm -
1 stop8h 30m
Sat 10/178:00 am -
1 stop29h 20m
Deal found 9/2![WestJet logo]()
$352
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 9/248:55 pm -
1 stop19h 05m
Wed 9/301:45 pm -
1 stop20h 30m
Deal found 9/2![Multiple Airlines logo]()
$353
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 11/128:55 pm -
1 stop16h 11m
Sat 11/144:35 pm -
1 stop17h 51m
Deal found 9/4![Multiple Airlines logo]()
$363
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 5, 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 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/610:47 pm -
2 stops19h 03m
Sun 10/118:40 pm -
1 stop16h 40m
Deal found 9/2![Multiple Airlines logo]()
$386
This FlightHub deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 9/1812:15 pm -
1 stop29h 35m
Sun 9/208:40 pm -
1 stop16h 40m
Deal found 9/5![WestJet logo]()
$411
This Delta deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/912:10 pm -
2 stops10h 10m
Sat 9/126:55 am -
2 stops11h 20m
Deal found 9/1![Delta logo]()
$506
This Air Canada deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 -
1 stop8h 05m
Mon 10/198:30 pm -
1 stop16h 01m
Deal found 9/4![Air Canada logo]()
$561
This United Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 11/56:00 am -
1 stop6h 03m
Fri 11/134:10 pm -
Nonstop3h 54m
Deal found 9/2![United Airlines logo]()
$610
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/297:12 pm -
2 stops18h 48m
Tue 10/610:50 am -
1 stop8h 26m
Deal found 9/1![Multiple Airlines logo]()
$405
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 11/110:39 am -
1 stop29h 36m
Tue 12/11:10 pm -
2 stops21h 13m
Deal found 9/3![Multiple Airlines logo]()
$409
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/112:15 pm -
1 stop27h 00m
Thu 10/87:20 am -
2 stops28h 38m
Deal found 9/2![Multiple Airlines logo]()
$415
This Delta deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 10/216:05 am -
1 stop15h 10m
Fri 11/136:30 am -
1 stop11h 32m
Deal found 9/1![Delta logo]()
$515
This Air Canada deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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.
Wed 11/2511:25 am -
1 stop8h 11m
Mon 11/308:30 am -
1 stop13h 57m
Deal found 9/2![Air Canada logo]()
$561
This Delta deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/110:28 am -
2 stops11h 52m
Thu 10/812:25 pm -
2 stops13h 19m
Deal found 9/2![Delta logo]()
$518
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 10/58:55 pm -
1 stop15h 30m
Thu 10/81:40 pm -
2 stops20h 37m
Deal found 9/1![Multiple Airlines logo]()
$440
This Justfly.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 9/2512:15 pm -
1 stop29h 35m
Sun 9/278:40 pm -
1 stop16h 40m
Deal found 9/4![WestJet logo]()
$598
This Delta deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/2312:59 am -
2 stops14h 36m
Fri 10/212:25 pm -
2 stops13h 10m
Deal found 9/1![Delta logo]()
$525
This United Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 12/219:44 am -
Nonstop3h 18m
Sun 1/34:10 pm -
Nonstop4h 03m
Deal found 9/5![United Airlines logo]()
$654
This Mytrip deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 9/277:50 pm -
3 stops22h 25m
Sat 10/34:55 pm -
2 stops20h 25m
Deal found 9/4![Multiple Airlines logo]()
$463
This Booking.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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.
Sun 9/2712:15 pm -
1 stop29h 35m
Sat 10/38:40 pm -
1 stop16h 40m
Deal found 9/1![WestJet logo]()
$621
This Delta deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 10/45:30 am -
1 stop9h 14m
Tue 10/137:34 pm -
1 stop6h 10m
Deal found 9/3![Delta logo]()
$535
This United Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 9/2610:02 am -
Nonstop3h 12m
Sun 9/276:10 am -
1 stop10h 04m
Deal found 9/3![United Airlines logo]()
$669
This Mytrip deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/412:15 pm -
3 stops27h 20m
Sun 10/116:05 am -
3 stops31h 15m
Deal found 9/4![Multiple Airlines logo]()
$477
This Air Canada deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 12/411:25 am -
Nonstop3h 45m
Mon 12/78:45 am -
1 stop11h 28m
Deal found 9/4![Air Canada logo]()
$722
This WestJet deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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.
Thu 10/112:15 pm -
1 stop15h 20m
Sun 10/47:20 am -
1 stop30h 00m
Deal found 9/2![WestJet logo]()
$669
This Delta deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/136:20 am -
2 stops16h 00m
Thu 10/2212:25 pm -
2 stops13h 19m
Deal found 9/4![Delta logo]()
$561
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 10/198:10 am -
1 stop5h 50m
Mon 10/269:10 am -
2 stops14h 39m
Deal found 9/1![Multiple Airlines logo]()
$519
This United Airlines deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 10/138:29 pm -
1 stop13h 31m
Mon 10/196:30 pm -
1 stop15h 09m
Deal found 8/31![United Airlines logo]()
$778
This Mytrip deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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.
Fri 10/212:15 pm -
1 stop8h 58m
Wed 10/76:55 pm -
1 stop18h 25m
Deal found 9/3![Multiple Airlines logo]()
$527
This Air Canada deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 10/2211:21 am -
2 stops19h 59m
Mon 10/265:30 am -
1 stop7h 05m
Deal found 8/31![Air Canada logo]()
$865
This Delta deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/205:25 pm -
1 stop13h 07m
Tue 11/37:50 pm -
1 stop26h 52m
Deal found 9/4![Delta logo]()
$669
This Mytrip deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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.
Fri 10/167:50 pm -
3 stops17h 15m
Fri 10/236:55 pm -
2 stops24h 03m
Deal found 9/1![Multiple Airlines logo]()
$532
This oojo deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 9/2512:15 pm -
1 stop29h 35m
Fri 10/28:40 pm -
2 stops22h 53m
Deal found 9/4![WestJet logo]()
$870
Last-minute flights from Denver to OntarioDiscover last-minute flight deals from Denver to Ontario. Data last updated September 5, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to Ontario. Data last updated September 5, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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.
Thu 9/1012:15 pm -
1 stop29h 35m
Sun 9/138:40 pm -
1 stop16h 40m
Deal found 9/1![WestJet logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 9/246:40 am -
2 stops13h 15m
Wed 9/304:45 pm -
1 stop26h 31m
Deal found 9/2![Multiple Airlines logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 9/248:55 pm -
1 stop19h 05m
Wed 9/301:45 pm -
1 stop20h 30m
Deal found 9/2![Multiple Airlines logo]()
$353
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/2810:38 am -
1 stop9h 17m
Wed 9/304:45 pm -
1 stop26h 31m
Deal found 9/1![Multiple Airlines logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/2810:38 am -
1 stop9h 17m
Tue 9/2912:55 pm -
1 stop10h 54m
Deal found 9/1![Multiple Airlines logo]()
$343
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/1512:15 pm -
1 stop8h 30m
Mon 10/194:45 pm -
1 stop26h 36m
Deal found 9/4![Multiple Airlines logo]()
$320
This Trip.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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.
Thu 10/1512:15 pm -
1 stop8h 30m
Sat 10/178:00 am -
1 stop29h 20m
Deal found 9/2![WestJet logo]()
$352
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/198:10 am -
1 stop11h 45m
Mon 10/261:00 pm -
1 stop30h 22m
Deal found 9/4![Multiple Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/2010:38 am -
1 stop27h 22m
Sat 10/2410:50 am -
1 stop8h 31m
Deal found 9/2![Multiple Airlines logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/2010:38 am -
1 stop27h 22m
Sun 11/11:10 pm -
1 stop30h 12m
Deal found 9/2![Multiple Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 10/206:57 pm -
2 stops19h 58m
Sun 10/251:00 pm -
1 stop30h 21m
Deal found 9/3![Multiple Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 10/2010:40 am -
2 stops27h 20m
Sun 10/254:35 pm -
1 stop17h 44m
Deal found 9/3![Multiple Airlines logo]()
$367
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 5, 2026.
Search for one-way flight options from Denver to Ontario. Find affordable one-way fares based on user searches. Data last updated September 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/3010:38 am -
1 stop9h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Multiple Airlines logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 10/2210:38 am -
1 stop9h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Multiple Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/3010:38 am -
1 stop27h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Multiple Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/1512:15 pm -
1 stop9h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![WestJet logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 9/2512:15 pm -
1 stop8h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![WestJet logo]()
$140
This Trip.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 9/1312:15 pm -
1 stop9h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![WestJet logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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 9/2810:38 am -
1 stop9h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Multiple Airlines logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 10/212:15 pm -
1 stop8h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![WestJet logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/510:38 am -
1 stop9h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 9/248:55 pm -
1 stop19h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Multiple Airlines logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 9/4. Clicking the “Pick Dates” 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 10/510:38 am -
1 stop27h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$158
This WestJet deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” 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.
Sun 10/1112:15 pm -
1 stop9h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![WestJet logo]()
$167
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 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $289 (Kiwi.com) |
One-way from | $126 (Kiwi.com) |
Popular in | February |
Cheapest in | October |
Average price | $599 |
Good round-trip deal | $542 or less |
Good one-way deal | $273 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 5, 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
Fri 9/25
8:55 pm-6:00 pm
1 stop19h 05m
Toronto Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$173
DenverToronto
DEN Denver Intl - YYZ Toronto Pearson Intl
DENYYZ
Denver Intl
Fri 9/25
12:15 pm-1:05 am
1 stop10h 50m
Toronto Pearson Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$173
DenverMontreal
DEN Denver Intl - YUL Montreal Pierre Elliott Trudeau Intl
DENYUL
Denver Intl
Thu 9/17
12:15 pm-4:30 pm
1 stop26h 15m
Montreal Pierre Elliott Trudeau Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$177
DenverToronto
DEN Denver Intl - YKF Toronto Region of Waterloo Intl
DENYKF
Denver Intl
Thu 9/10
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$177
DenverToronto
DEN Denver Intl - YKF Toronto Region of Waterloo Intl
DENYKF
Denver Intl
Fri 9/25
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$177
DenverToronto
DEN Denver Intl - YYZ Toronto Pearson Intl
DENYYZ
Denver Intl
Thu 9/24
10:47 pm-5:45 am
2 stops28h 58m
Toronto Pearson Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$178
DenverHamilton
DEN Denver Intl - YHM Hamilton
DENYHM
Denver Intl
Thu 9/10
12:15 pm-5:15 pm
1 stop27h 00m
Hamilton
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$179
DenverToronto
DEN Denver Intl - YTZ Toronto Island
DENYTZ
Denver Intl
Sun 11/1
10:39 am-6:15 pm
1 stop29h 36m
Toronto Island
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$188
DenverOttawa
DEN Denver Intl - YOW Ottawa
DENYOW
Denver Intl
Fri 10/16
7:12 am-5:35 am
2 stops20h 23m
Ottawa
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$190
DenverToronto
DEN Denver Intl - YYZ Toronto Pearson Intl
DENYYZ
Denver Intl
Mon 9/28
7:00 am-1:05 am
2 stops16h 05m
Toronto Pearson Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$191
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-YOW
DEN-YUL
DEN-YKF
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-YOW
DEN-YUL
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 5, 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 5, 2026.
The most flights from DEN to CAON are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from Denver to Region of Ontario?
Airfare is typical for this route at the moment.
Denver to Region of Ontario flights typically cost between $262 and $676 in October.The cheapest round-trip price found within the last 5 days was $289 on Multiple Airlines (Oct 19-Oct 26).
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 5, 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.
Crew
8.1
Boarding
7.7
Food
6.6
Comfort
7.3
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
10.0
ExcellentMichelle,Dec 2025
DEN - MKE
Crew
8.1
Boarding
7.7
Food
6.6
Comfort
7.3
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
10.0
ExcellentMichelle,Dec 2025
DEN - MKE
Crew
8.1
Boarding
7.7
Food
6.6
Comfort
7.3
Entertainment
7.1
Overall
7.4
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
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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 5, 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 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$222 | Average$684 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$268 | Average$769 | FlexibilityNo cancel fee | On-time69% |