$140+ Cheap flights from Kentucky to Ontario (ONT)
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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Nov 21 — Nov 281
Round-trip
1 adult, Economy
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Find cheap flights from Kentucky 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Kentucky to Ontario
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Cheapest flights from Kentucky to OntarioExplore the most affordable flight options available from Kentucky to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 22, 2026.
Explore the most affordable flight options available from Kentucky to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/18. 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 12/48:47 am -
1 stop17h 11m
Thu 12/107:26 pm -
1 stop20h 53m
Deal found 10/18![Multiple Airlines logo]()
$270
This American Airlines deal was found by Cheapflights users on 10/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:10 pm -
1 stop7h 51m
Mon 11/232:09 pm -
1 stop7h 06m
Deal found 10/19![American Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:50 am -
1 stop6h 20m
Sun 11/1511:55 pm -
1 stop7h 35m
Deal found 10/19![Southwest logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 10/18. 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 12/48:47 am -
1 stop17h 11m
Sun 12/67:26 pm -
1 stop20h 53m
Deal found 10/18![Multiple Airlines logo]()
$310
This United Airlines deal was found by Cheapflights users on 10/19. 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.
Thu 11/127:00 am -
2 stops11h 33m
Mon 11/235:00 am -
1 stop6h 22m
Deal found 10/19![United Airlines logo]()
$318
This Delta deal was found by Cheapflights users on 10/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/93:00 pm -
1 stop9h 57m
Thu 11/267:05 am -
1 stop6h 49m
Deal found 10/19![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 10/19. 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 11/1110:37 am -
2 stops10h 24m
Sun 11/155:00 am -
1 stop6h 22m
Deal found 10/19![United Airlines logo]()
$341
This Delta deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/95:59 pm -
1 stop6h 58m
Mon 11/1611:10 pm -
1 stop6h 56m
Deal found 10/21![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/135:59 pm -
1 stop6h 58m
Mon 11/1611:10 pm -
1 stop8h 02m
Deal found 10/21![Delta logo]()
$379
This Delta deal was found by Cheapflights users on 10/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:59 pm -
1 stop6h 58m
Thu 11/2612:18 pm -
1 stop7h 20m
Deal found 10/19![Delta logo]()
$379
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/218:30 pm -
1 stop6h 15m
Mon 11/301:00 pm -
1 stop8h 10m
Deal found 10/19![Southwest logo]()
$390
This American Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:59 pm -
1 stop8h 02m
Mon 11/911:59 pm -
1 stop8h 39m
Deal found 10/21![American Airlines logo]()
$449
Best flights from Kentucky to OntarioDiscover carefully curated flight deals from Kentucky to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 22, 2026.
Discover carefully curated flight deals from Kentucky to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 22, 2026.
This Southwest deal was found by Cheapflights users on 10/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/2811:30 am -
1 stop8h 30m
Thu 2/115:00 am -
1 stop8h 15m
Deal found 10/20![Southwest logo]()
$296
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 1/288:50 am -
2 stops11h 45m
Thu 2/115:00 am -
1 stop6h 27m
Deal found 10/21![United Airlines logo]()
$349
This Delta deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/135:59 pm -
1 stop6h 58m
Mon 11/1611:10 pm -
1 stop8h 02m
Deal found 10/21![Delta logo]()
$379
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/103:45 pm -
1 stop8h 55m
Wed 11/115:00 am -
1 stop6h 22m
Deal found 10/21![United Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 2/43:27 pm -
1 stop8h 33m
Tue 2/91:42 pm -
1 stop5h 48m
Deal found 10/21![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 10/18. 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.
Fri 2/53:24 pm -
1 stop9h 50m
Tue 2/1612:00 pm -
1 stop9h 02m
Deal found 10/18![Delta logo]()
$459
This Delta deal was found by Cheapflights users on 10/18. 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.
Wed 2/103:24 pm -
1 stop9h 50m
Wed 2/1712:00 pm -
1 stop9h 02m
Deal found 10/18![Delta logo]()
$459
This United Airlines deal was found by Cheapflights users on 10/20. 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 12/113:20 pm -
1 stop8h 51m
Sun 12/135:00 am -
1 stop6h 17m
Deal found 10/20![United Airlines logo]()
$494
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Sat 12/58:04 am -
1 stop7h 30m
Wed 12/911:20 am -
2 stops9h 36m
Deal found 10/18![United Airlines logo]()
$504
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Tue 1/198:20 am -
1 stop7h 20m
Mon 1/256:37 pm -
2 stops12h 27m
Deal found 10/18![United Airlines logo]()
$504
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Wed 1/68:20 am -
1 stop7h 20m
Wed 1/135:00 am -
2 stops9h 22m
Deal found 10/18![United Airlines logo]()
$504
This United Airlines deal was found by Cheapflights users on 10/17. 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.
Thu 11/269:00 am -
1 stop6h 33m
Fri 12/411:20 am -
2 stops9h 36m
Deal found 10/17![United Airlines logo]()
$504
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/59:00 am -
1 stop6h 33m
Mon 11/91:29 pm -
1 stop6h 07m
Deal found 10/21![United Airlines logo]()
$589
This United Airlines deal was found by Cheapflights users on 10/17. 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.
Fri 12/43:20 pm -
1 stop8h 51m
Thu 12/101:40 pm -
1 stop5h 45m
Deal found 10/17![United Airlines logo]()
$607
This United Airlines deal was found by Cheapflights users on 10/17. 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.
Thu 2/43:25 pm -
1 stop9h 50m
Sun 2/71:42 pm -
1 stop5h 48m
Deal found 10/17![United Airlines logo]()
$607
Last-minute flights from Kentucky to OntarioDiscover last-minute flight deals from Kentucky to Ontario. Data last updated October 22, 2026 and is based on user searches.
Discover last-minute flight deals from Kentucky to Ontario. Data last updated October 22, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:59 pm -
1 stop8h 02m
Mon 11/911:59 pm -
1 stop8h 39m
Deal found 10/21![American Airlines logo]()
$449
This American Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:59 pm -
1 stop8h 02m
Sun 11/87:49 pm -
2 stops11h 14m
Deal found 10/21![American Airlines logo]()
$454
This Delta deal was found by Cheapflights users on 10/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/93:00 pm -
1 stop9h 57m
Thu 11/267:05 am -
1 stop6h 49m
Deal found 10/19![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/95:59 pm -
1 stop6h 58m
Mon 11/1611:10 pm -
1 stop6h 56m
Deal found 10/21![Delta logo]()
$359
This United Airlines deal was found by Cheapflights users on 10/20. 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.
Tue 11/103:45 pm -
1 stop8h 55m
Wed 11/115:00 am -
1 stop6h 22m
Deal found 10/20![United Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:50 am -
1 stop6h 20m
Sun 11/1511:55 pm -
1 stop7h 35m
Deal found 10/19![Southwest logo]()
$291
This United Airlines deal was found by Cheapflights users on 10/19. 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 11/1110:37 am -
2 stops10h 24m
Sun 11/155:00 am -
1 stop6h 22m
Deal found 10/19![United Airlines logo]()
$341
This American Airlines deal was found by Cheapflights users on 10/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:10 pm -
1 stop7h 51m
Mon 11/232:09 pm -
1 stop7h 06m
Deal found 10/19![American Airlines logo]()
$279
This United Airlines deal was found by Cheapflights users on 10/19. 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.
Thu 11/127:00 am -
2 stops11h 33m
Mon 11/235:00 am -
1 stop6h 22m
Deal found 10/19![United Airlines logo]()
$318
This Delta deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/135:59 pm -
1 stop6h 58m
Mon 11/1611:10 pm -
1 stop8h 02m
Deal found 10/21![Delta logo]()
$379
This Delta deal was found by Cheapflights users on 10/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:59 pm -
1 stop6h 58m
Thu 11/2612:18 pm -
1 stop7h 20m
Deal found 10/19![Delta logo]()
$379
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/218:30 pm -
1 stop6h 15m
Mon 11/301:00 pm -
1 stop8h 10m
Deal found 10/19![Southwest logo]()
$390
One-way flights from Kentucky to OntarioSearch for one-way flight options from Kentucky to Ontario. Find affordable one-way fares based on user searches. Data last updated October 22, 2026.
Search for one-way flight options from Kentucky to Ontario. Find affordable one-way fares based on user searches. Data last updated October 22, 2026.
This Delta deal was found by Cheapflights users on 10/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/176:00 am -
1 stop8h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Delta logo]()
$140
This Southwest deal was found by Cheapflights users on 10/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1712:10 pm -
2 stops10h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Southwest logo]()
$145
This Southwest deal was found by Cheapflights users on 10/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/256:15 am -
1 stop7h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Southwest logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 11/168:47 am -
1 stop13h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Multiple Airlines logo]()
$186
This United Airlines deal was found by Cheapflights users on 10/20. 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.
Tue 3/23:20 pm -
1 stop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![United Airlines logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 10/19. 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 2/2212:09 pm -
3 stops38h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Multiple Airlines logo]()
$219
This United Airlines deal was found by Cheapflights users on 10/19. 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.
Mon 3/13:20 pm -
1 stop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![United Airlines logo]()
$234
This Delta deal was found by Cheapflights users on 10/17. 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.
Mon 11/236:00 am -
1 stop8h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/17![Delta logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 10/18. 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 1/39:08 pm -
3 stops26h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/18![Multiple Airlines logo]()
$376
This Delta deal was found by Cheapflights users on 10/17. 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.
Mon 11/236:00 am -
1 stop8h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/17![Delta logo]()
$379
This American Airlines deal was found by Cheapflights users on 10/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/37:53 pm -
1 stop7h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/18![American Airlines logo]()
$419
This United Airlines deal was found by Cheapflights users on 10/18. 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.
Mon 11/231:49 pm -
1 stop7h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/18![United Airlines logo]()
$433
Find flight deals from Kentucky to Ontario
Keep the following information in mind while searching for Kentucky to Ontario flight deals. Data was last updated October 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $270 (Kiwi.com) |
One-way from | $140 (Delta) |
Popular in | December |
Cheapest in | September |
Average price | $424 |
Cheapflights Fare Finder
Customize your flight search to find flights from Kentucky 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 October 22, 2026.
Use the filters below to find and compare flights from Kentucky to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Tue 2/23
6:15 am-10:15 am
1 stop7h 00m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$140
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Tue 1/12
3:35 pm-8:50 pm
2 stops8h 15m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$145
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Mon 2/1
6:15 am-10:15 am
1 stop7h 00m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$156
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Mon 1/25
3:27 pm-9:00 pm
1 stop8h 33m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$200
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Mon 11/23
6:00 am-11:03 am
1 stop8h 03m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$244
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Mon 2/22
10:15 am-8:20 pm
2 stops13h 05m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$249
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Sat 4/3
3:50 pm-9:21 pm
1 stop8h 31m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$276
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Tue 11/24
3:24 pm-8:51 pm
1 stop8h 27m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$276
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
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Louisville Intl
Thu 1/28
11:30 am-5:00 pm
1 stop8h 30m
Ontario
Thu 2/11
5:00 am-4:15 pm
1 stop8h 15m
$296
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Mon 11/23
3:24 pm-10:48 pm
2 stops10h 24m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$309
Showing 1-10 of 35 resultsSorted by cheapest first
Best time to book a flight from Kentucky to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Kentucky with our price prediction graph.
SDF-ONT
LEX-ONT
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 Kentucky to Ontario
USKY-ONT
SDF-ONT
LEX-ONT
What is the cheapest month to book a flight from Kentucky to Ontario?
Currently, March is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $359). Flying from Kentucky to Ontario in November is currently the most expensive (average of $656). 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.
How much does it cost to fly round-trip from Kentucky to Ontario?
Airfare is below average for this route at the moment.
Kentucky to Ontario flights typically cost between $478 and $768 in December.The cheapest round-trip price found within the last 5 days was $270 on Multiple Airlines (Dec 4-Dec 10).
Related info for your journey
Find useful and relevant information for your journey from Kentucky to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Kentucky 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 Kentucky to Ontario by cabin class
Find flights from Kentucky to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 22, 2026.
Kentucky and Ontario flights
Browse other Kentucky and Ontario flight options. Last updated on October 22, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Kentucky to Ontario flights
Consider these flights traveling from Kentucky to Ontario.
Top 4 airlines flying from Kentucky to Ontario
Discover the top 4 airlines that operate flights from Kentucky 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 October 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$323 | Average$368 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$324 | Average$481 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$337 | Average$507 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$370 | Average$492 | FlexibilityNo cancel fee | On-time63% |