$166+ Cheap flights from Denver (DEN) 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
Jul 9 — Jul 161
Round-trip
1 adult, Economy
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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 June 9, 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 June 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 9/226:25 am
DEN
- YTZ
1 stop6h 00m
Multiple Airlines
Tue 9/291:40 pm
YTZ
- DEN
1 stop12h 49m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Tue 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$363
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 9/226:25 am
DEN
- YTZ
1 stop6h 00m
Multiple Airlines
Thu 9/241:40 pm
YTZ
- DEN
1 stop12h 49m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Thu 7/1612:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am
DEN
- YYZ
1 stop12h 50m
Multiple Airlines
Sun 8/3012:55 pm
YYZ
- DEN
1 stop10h 54m
Multiple Airlines
Deal found 6/6![Multiple Airlines logo]()
$378
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:00 am
DEN
- YYZ
1 stop12h 50m
Multiple Airlines
Mon 8/2412:55 pm
YYZ
- DEN
1 stop10h 54m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$386
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Mon 7/2012:55 pm
YYZ
- DEN
1 stop20h 54m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$391
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Sun 8/234:45 pm
YYZ
- DEN
1 stop23h 24m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$396
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:56 pm
DEN
- YTZ
1 stop18h 29m
Multiple Airlines
Sat 9/1910:05 am
YTZ
- DEN
1 stop16h 24m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$397
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1010:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Thu 7/1612:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$398
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/1310:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Tue 7/2112:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$400
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/98:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Thu 7/1612:55 pm
YYZ
- DEN
1 stop28h 59m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$404
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 June 9, 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 June 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:56 pm
DEN
- YTZ
1 stop18h 29m
Multiple Airlines
Sat 9/1910:05 am
YTZ
- DEN
1 stop16h 24m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$397
This Justfly.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 8/1812:15 pm
DEN
- YOW
1 stop10h 25m
WestJet
Mon 8/241:20 pm
YOW
- DEN
1 stop24h 00m
WestJet
Deal found 6/9![WestJet logo]()
$478
This Delta deal was found by Cheapflights users on 6/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:35 am
DEN
- YYZ
1 stop9h 04m
Delta
Wed 7/226:10 am
YYZ
- DEN
2 stops14h 04m
Delta
Deal found 6/5![Delta logo]()
$526
This Sun Country Air deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/206:06 pm
DEN
- YYZ
1 stop20h 19m
Sun Country Air
Sun 6/285:55 pm
YYZ
- DEN
1 stop17h 10m
Sun Country Air
Deal found 6/8![Sun Country Air logo]()
$547
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 10/156:00 am
DEN
- YTZ
1 stop8h 41m
United Airlines
Mon 10/197:20 pm
YTZ
- DEN
1 stop13h 19m
United Airlines
Deal found 6/9![United Airlines logo]()
$573
This Air Canada deal was found by Cheapflights users on 6/5. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/3111:30 am
DEN
- YXU
1 stop7h 02m
Air Canada
Sun 8/95:40 am
YXU
- DEN
1 stop6h 55m
Air Canada
Deal found 6/5![Air Canada logo]()
$695
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Tue 9/85:15 pm
DEN
- YTZ
1 stop14h 25m
Multiple Airlines
Thu 9/108:40 pm
YTZ
- DEN
1 stop18h 20m
Multiple Airlines
Deal found 6/4![Multiple Airlines logo]()
$409
This Trip.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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.
Sat 8/812:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Sun 8/168:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/6![WestJet logo]()
$481
This Delta deal was found by Cheapflights users on 6/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:45 am
DEN
- YYZ
1 stop6h 34m
Delta
Mon 11/92:10 pm
YYZ
- DEN
1 stop8h 21m
Delta
Deal found 6/5![Delta logo]()
$550
This oojo deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 8/1112:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Wed 8/198:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/8![WestJet logo]()
$501
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/107:56 am
DEN
- YTZ
1 stop6h 04m
Multiple Airlines
Wed 7/228:50 am
YTZ
- DEN
1 stop17h 07m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$506
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 10/165:36 pm
DEN
- YTZ
1 stop14h 30m
United Airlines
Mon 10/197:20 pm
YTZ
- DEN
1 stop13h 19m
United Airlines
Deal found 6/9![United Airlines logo]()
$589
This Delta deal was found by Cheapflights users on 6/4. 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.
Sat 8/226:05 am
DEN
- YYZ
1 stop7h 15m
Delta
Mon 9/79:45 am
YYZ
- DEN
1 stop6h 00m
Delta
Deal found 6/4![Delta logo]()
$550
This oojo deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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.
Wed 8/1212:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Wed 8/198:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/8![WestJet logo]()
$501
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/15:05 pm
DEN
- YTZ
1 stop18h 00m
Multiple Airlines
Sat 7/48:50 am
YTZ
- DEN
1 stop17h 04m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$524
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/21:15 pm
DEN
- YYZ
1 stop6h 44m
Delta
Mon 10/52:30 pm
YYZ
- DEN
1 stop8h 08m
Delta
Deal found 6/7![Delta logo]()
$550
This Justfly.com deal was found by Cheapflights users on 6/5. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1012:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Mon 7/208:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/5![WestJet logo]()
$511
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/97:56 am
DEN
- YTZ
1 stop6h 04m
Multiple Airlines
Thu 7/161:45 pm
YTZ
- DEN
1 stop12h 12m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$524
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 9/156:00 am
DEN
- YUL
1 stop6h 18m
United Airlines
Sat 9/198:15 am
YUL
- DEN
Nonstop4h 16m
United Airlines
Deal found 6/8![United Airlines logo]()
$662
This Delta deal was found by Cheapflights users on 6/4. 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.
Thu 8/136:40 am
DEN
- YYZ
1 stop8h 55m
Delta
Sun 8/165:45 pm
YYZ
- DEN
1 stop7h 06m
Delta
Deal found 6/4![Delta logo]()
$550
This oojo deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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.
Wed 8/1212:15 pm
DEN
- YHM
1 stop27h 00m
WestJet
Wed 8/196:10 pm
YHM
- DEN
1 stop19h 10m
WestJet
Deal found 6/8![WestJet logo]()
$519
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 9/46:18 pm
DEN
- YUL
1 stop15h 42m
United Airlines
Sun 9/68:15 am
YUL
- DEN
Nonstop4h 18m
United Airlines
Deal found 6/8![United Airlines logo]()
$662
This Delta deal was found by Cheapflights users on 6/4. 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.
Fri 8/146:40 am
DEN
- YYZ
1 stop8h 55m
Delta
Sun 8/165:45 pm
YYZ
- DEN
1 stop7h 06m
Delta
Deal found 6/4![Delta logo]()
$550
This Kiwi.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 8/17:56 am
DEN
- YTZ
1 stop6h 04m
Multiple Airlines
Fri 8/71:45 pm
YTZ
- DEN
1 stop12h 12m
Multiple Airlines
Deal found 6/9![Multiple Airlines logo]()
$554
This Air Canada deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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.
Tue 9/19:40 am
DEN
- YXU
2 stops10h 00m
Air Canada
Sat 9/53:30 pm
YXU
- DEN
1 stop6h 52m
Air Canada
Deal found 6/8![Air Canada logo]()
$825
This Gotogate deal was found by Cheapflights users on 6/4. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/712:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Thu 9/108:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/4![WestJet logo]()
$535
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 9/48:00 am
DEN
- YUL
1 stop10h 48m
United Airlines
Tue 9/84:30 pm
YUL
- DEN
Nonstop4h 16m
United Airlines
Deal found 6/8![United Airlines logo]()
$662
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1611:10 am
DEN
- YYZ
1 stop9h 54m
Delta
Mon 10/196:00 pm
YYZ
- DEN
1 stop8h 23m
Delta
Deal found 6/8![Delta logo]()
$550
This Justfly.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/712:15 pm
DEN
- YKF
1 stop29h 35m
WestJet
Tue 7/148:40 pm
YKF
- DEN
1 stop16h 40m
WestJet
Deal found 6/7![WestJet logo]()
$541
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1710:00 am
DEN
- YOW
2 stops24h 25m
Multiple Airlines
Mon 8/244:15 pm
YOW
- DEN
1 stop21h 05m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$600
Last-minute flights from Denver to OntarioDiscover last-minute flight deals from Denver to Ontario. Data last updated June 9, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to Ontario. Data last updated June 9, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Thu 7/1612:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Mon 7/2012:55 pm
YYZ
- DEN
1 stop20h 54m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$391
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/98:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Thu 7/1612:55 pm
YYZ
- DEN
1 stop28h 59m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$404
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1010:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Thu 7/1612:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$398
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1010:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Thu 7/2312:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$415
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1010:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Fri 7/1712:55 pm
YYZ
- DEN
1 stop20h 54m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$419
This Kiwi.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1010:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Mon 7/1312:55 pm
YYZ
- DEN
1 stop20h 54m
Multiple Airlines
Deal found 6/6![Multiple Airlines logo]()
$420
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/1310:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Tue 7/2112:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$400
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/138:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Wed 8/54:45 pm
YYZ
- DEN
1 stop23h 46m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$418
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Tue 7/2812:55 pm
YYZ
- DEN
1 stop10h 46m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$363
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 7/275:05 pm
DEN
- YTZ
1 stop18h 00m
Multiple Airlines
Wed 8/58:50 am
YTZ
- DEN
1 stop17h 07m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$414
This Booking.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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.
Tue 7/2812:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Thu 8/63:50 pm
YYZ
- DEN
1 stop21h 30m
WestJet
Deal found 6/8![WestJet logo]()
$409
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 June 9, 2026.
Search for one-way flight options from Denver to Ontario. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/228:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Deal found 6/6![Multiple Airlines logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Wed 9/25:15 pm
DEN
- YTZ
1 stop22h 45m
Multiple Airlines
Deal found 6/4![Multiple Airlines logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Wed 7/298:52 pm
DEN
- YYZ
1 stop21h 58m
Multiple Airlines
Deal found 6/4![Multiple Airlines logo]()
$171
This Mytrip deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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.
Wed 7/2212:15 pm
DEN
- YYZ
1 stop9h 55m
WestJet
Deal found 6/8![WestJet logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Wed 9/27:23 am
DEN
- YYZ
1 stop12h 32m
Multiple Airlines
Deal found 6/4![Multiple Airlines logo]()
$181
This Trip.com deal was found by Cheapflights users on 6/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2010:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Deal found 6/5![Multiple Airlines logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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
DEN
- YYZ
1 stop9h 55m
WestJet
Deal found 6/8![WestJet logo]()
$184
This CheapOair deal was found by Cheapflights users on 6/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2612:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 6/5![WestJet logo]()
$187
This Justfly.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:15 pm
DEN
- YYZ
1 stop8h 30m
WestJet
Deal found 6/9![WestJet logo]()
$190
This Justfly.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 8/2012:15 pm
DEN
- YUL
1 stop9h 30m
WestJet
Deal found 6/8![WestJet logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/3110:15 am
DEN
- YYZ
1 stop8h 35m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$191
This Booking.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2212:15 pm
DEN
- YOW
1 stop25h 05m
WestJet
Deal found 6/8![WestJet logo]()
$194
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 June 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $356 (Kiwi.com) |
One-way from | $166 (Kiwi.com) |
Popular in | February |
Cheapest in | August |
Average price | $576 |
Good round-trip deal | $734 or less |
Good one-way deal | $306 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 2,558,603 searches. Data last updated June 9, 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 - YTZ
DENYTZ
Denver Intl
Sat 9/12
5:56 pm-2:25 pm
1 stop18h 29m
Toronto Island
Sat 9/19
10:05 am-12:29 am
1 stop16h 24m
$397
DenverToronto
DEN - YTZ
DENYTZ
Denver Intl
Tue 9/8
5:15 pm-9:40 am
1 stop14h 25m
Toronto Island
Thu 9/10
8:40 pm-1:00 pm
1 stop18h 20m
$409
DenverOttawa
DEN - YOW
DENYOW
Denver Intl
Tue 8/18
12:15 pm-12:40 am
1 stop10h 25m
Ottawa
Mon 8/24
1:20 pm-11:20 am
1 stop24h 00m
$478
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Sat 8/8
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Sun 8/16
8:40 pm-11:20 am
1 stop16h 40m
$481
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Tue 8/11
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Wed 8/19
8:40 pm-11:20 am
1 stop16h 40m
$501
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Wed 8/12
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Wed 8/19
8:40 pm-11:20 am
1 stop16h 40m
$501
DenverToronto
DEN - YTZ
DENYTZ
Denver Intl
Fri 7/10
7:56 am-4:00 pm
1 stop6h 04m
Toronto Island
Wed 7/22
8:50 am-11:57 pm
1 stop17h 07m
$506
DenverToronto
DEN - YKF
DENYKF
Denver Intl
Fri 7/10
12:15 pm-7:50 pm
1 stop29h 35m
Toronto Region of Waterloo Intl
Mon 7/20
8:40 pm-11:20 am
1 stop16h 40m
$511
DenverHamilton
DEN - YHM
DENYHM
Denver Intl
Wed 8/12
12:15 pm-5:15 pm
1 stop27h 00m
Hamilton
Wed 8/19
6:10 pm-11:20 am
1 stop19h 10m
$519
DenverToronto
DEN - YTZ
DENYTZ
Denver Intl
Wed 7/1
5:05 pm-1:05 pm
1 stop18h 00m
Toronto Island
Sat 7/4
8:50 am-11:54 pm
1 stop17h 04m
$524
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-YYZ
DEN-YTZ
DEN-YUL
DEN-YOW
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-YYZ
DEN-YTZ
DEN-YUL
DEN-YOW
What is the cheapest month to book a flight from Denver to Region of Ontario?
Currently, July is the cheapest month in which you can book a flight from Denver to Region of Ontario (average of $119). Flying from Denver to Region of Ontario in May is currently the most expensive (average of $244). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from 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 June 9, 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 June 9, 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 (9 on average).
How much does it cost to fly round-trip from Denver to Region of Ontario?
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 67 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 June 9, 2026.
Read reviews from past customers who have flown Delta,United Airlines, andWestJet from Denver to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Entertainment
7.8
Food
7.2
Comfort
7.8
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
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
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 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 June 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 4 airlines flying from Denver to Ontario
Discover the top 4 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 2,558,603 searches. Data last updated June 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$186 | Average$558 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$218 | Average$488 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$223 | Average$386 | FlexibilityNo cancel fee | On-time60% | |
| Cheapest$224 | Average$575 | FlexibilityNo cancel fee | On-time69% |