$145+ Cheap flights from Louisville to Ontario (SDF - ONT)
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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Aug 27 — Sep 31
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Louisville 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 Louisville to Ontario
Cheapest
Best
Last-minute
One-way
Cheapest flights from Louisville to OntarioExplore the most affordable flight options available from Louisville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2026.
Explore the most affordable flight options available from Louisville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2026.
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:00 am
SDF
- ONT
1 stop7h 42m
Delta
Tue 9/17:05 am
ONT
- SDF
1 stop9h 28m
Delta
Deal found 7/28![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/103:20 pm
SDF
- ONT
2 stops8h 05m
Southwest
Mon 9/1411:55 pm
ONT
- SDF
1 stop8h 20m
Southwest
Deal found 7/24![Southwest logo]()
$294
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/27:05 am
SDF
- ONT
1 stop6h 37m
Delta
Sat 9/512:00 pm
ONT
- SDF
1 stop7h 08m
Delta
Deal found 7/24![Delta logo]()
$299
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/67:05 am
SDF
- ONT
1 stop6h 37m
Delta
Sat 9/1212:17 pm
ONT
- SDF
1 stop6h 42m
Delta
Deal found 7/24![Delta logo]()
$304
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:25 pm
SDF
- ONT
1 stop9h 27m
Delta
Wed 9/27:05 am
ONT
- SDF
1 stop6h 55m
Delta
Deal found 7/28![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/281:17 pm
SDF
- ONT
1 stop8h 13m
Delta
Wed 9/27:05 am
ONT
- SDF
1 stop6h 55m
Delta
Deal found 7/28![Delta logo]()
$343
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:45 am
SDF
- ONT
1 stop11h 45m
Southwest
Mon 9/711:55 pm
ONT
- SDF
1 stop8h 25m
Southwest
Deal found 7/25![Southwest logo]()
$344
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/27:05 am
SDF
- ONT
2 stops8h 25m
Southwest
Wed 9/99:40 am
ONT
- SDF
2 stops8h 00m
Southwest
Deal found 7/26![Southwest logo]()
$349
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/145:50 pm
SDF
- ONT
1 stop7h 02m
Delta
Sat 8/227:05 am
ONT
- SDF
1 stop9h 37m
Delta
Deal found 7/24![Delta logo]()
$353
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/57:05 am
SDF
- ONT
1 stop6h 37m
Delta
Sun 9/612:00 pm
ONT
- SDF
1 stop9h 09m
Delta
Deal found 7/24![Delta logo]()
$360
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:00 am
SDF
- ONT
1 stop7h 42m
Delta
Thu 9/312:00 pm
ONT
- SDF
1 stop9h 34m
Delta
Deal found 7/28![Delta logo]()
$364
Best flights from Louisville to OntarioDiscover carefully curated flight deals from Louisville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 28, 2026.
Discover carefully curated flight deals from Louisville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 28, 2026.
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 9/1011:05 am
SDF
- ONT
1 stop7h 00m
Southwest
Mon 9/1411:55 pm
ONT
- SDF
1 stop8h 20m
Southwest
Deal found 7/23![Southwest logo]()
$289
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 9/17:05 am
SDF
- ONT
1 stop6h 37m
Delta
Sat 9/512:00 pm
ONT
- SDF
1 stop7h 08m
Delta
Deal found 7/24![Delta logo]()
$299
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/255:45 pm
SDF
- ONT
1 stop7h 50m
United Airlines
Tue 9/19:15 am
ONT
- SDF
1 stop7h 44m
United Airlines
Deal found 7/28![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/27:05 am
SDF
- ONT
1 stop6h 37m
Delta
Sat 9/1212:17 pm
ONT
- SDF
1 stop8h 42m
Delta
Deal found 7/25![Delta logo]()
$299
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 10/307:00 am
SDF
- ONT
1 stop7h 08m
Delta
Tue 11/312:18 pm
ONT
- SDF
1 stop8h 44m
Delta
Deal found 7/24![Delta logo]()
$304
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/33:36 pm
SDF
- ONT
1 stop8h 22m
United Airlines
Wed 10/71:24 pm
ONT
- SDF
1 stop6h 08m
United Airlines
Deal found 7/27![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:25 pm
SDF
- ONT
1 stop9h 27m
Delta
Wed 9/212:00 pm
ONT
- SDF
1 stop9h 24m
Delta
Deal found 7/26![Delta logo]()
$339
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 10/293:24 pm
SDF
- ONT
1 stop8h 27m
United Airlines
Mon 11/25:00 am
ONT
- SDF
1 stop6h 22m
United Airlines
Deal found 7/24![United Airlines logo]()
$389
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/512:20 pm
SDF
- ONT
1 stop9h 24m
United Airlines
Wed 12/95:00 am
ONT
- SDF
1 stop6h 27m
United Airlines
Deal found 7/27![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/45:50 pm
SDF
- ONT
1 stop7h 02m
Delta
Mon 9/1410:00 pm
ONT
- SDF
1 stop9h 19m
Delta
Deal found 7/25![Delta logo]()
$388
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:25 pm
SDF
- ONT
1 stop8h 28m
United Airlines
Wed 9/91:18 pm
ONT
- SDF
1 stop6h 18m
United Airlines
Deal found 7/25![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 10/257:00 am
SDF
- ONT
1 stop7h 08m
Delta
Wed 10/2812:18 pm
ONT
- SDF
1 stop7h 17m
Delta
Deal found 7/24![Delta logo]()
$388
Last-minute flights from Louisville to OntarioDiscover last-minute flight deals from Louisville to Ontario. Data last updated July 28, 2026 and is based on user searches.
Discover last-minute flight deals from Louisville to Ontario. Data last updated July 28, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/145:50 pm
SDF
- ONT
1 stop7h 02m
Delta
Sat 8/227:05 am
ONT
- SDF
1 stop9h 37m
Delta
Deal found 7/24![Delta logo]()
$353
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/157:05 am
SDF
- ONT
1 stop6h 37m
Delta
Tue 8/1812:00 pm
ONT
- SDF
1 stop9h 34m
Delta
Deal found 7/24![Delta logo]()
$374
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/193:25 pm
SDF
- ONT
1 stop7h 28m
Delta
Wed 9/212:00 pm
ONT
- SDF
1 stop7h 08m
Delta
Deal found 7/25![Delta logo]()
$299
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/193:25 pm
SDF
- ONT
1 stop7h 28m
Delta
Sun 8/307:05 am
ONT
- SDF
1 stop6h 55m
Delta
Deal found 7/25![Delta logo]()
$388
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/243:35 pm
SDF
- ONT
1 stop9h 24m
United Airlines
Mon 8/315:00 am
ONT
- SDF
1 stop6h 29m
United Airlines
Deal found 7/28![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:00 am
SDF
- ONT
1 stop7h 42m
Delta
Tue 9/17:05 am
ONT
- SDF
1 stop9h 28m
Delta
Deal found 7/28![Delta logo]()
$289
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:00 am
SDF
- ONT
1 stop7h 42m
Delta
Thu 9/312:00 pm
ONT
- SDF
1 stop9h 34m
Delta
Deal found 7/28![Delta logo]()
$364
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:05 am
SDF
- ONT
1 stop6h 37m
Delta
Sun 8/307:05 am
ONT
- SDF
1 stop9h 25m
Delta
Deal found 7/28![Delta logo]()
$378
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:25 pm
SDF
- ONT
1 stop9h 27m
Delta
Wed 9/27:05 am
ONT
- SDF
1 stop6h 55m
Delta
Deal found 7/28![Delta logo]()
$339
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/276:05 am
SDF
- ONT
2 stops8h 58m
American Airlines
Sun 8/3012:33 pm
ONT
- SDF
1 stop7h 44m
American Airlines
Deal found 7/23![American Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:25 pm
SDF
- ONT
1 stop9h 27m
Delta
Fri 8/2812:00 pm
ONT
- SDF
1 stop7h 08m
Delta
Deal found 7/28![Delta logo]()
$393
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/281:17 pm
SDF
- ONT
1 stop8h 13m
Delta
Wed 9/27:05 am
ONT
- SDF
1 stop6h 55m
Delta
Deal found 7/28![Delta logo]()
$343
One-way flights from Louisville to OntarioSearch for one-way flight options from Louisville to Ontario. Find affordable one-way fares based on user searches. Data last updated July 28, 2026.
Search for one-way flight options from Louisville to Ontario. Find affordable one-way fares based on user searches. Data last updated July 28, 2026.
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/136:00 am
SDF
- ONT
1 stop7h 42m
Delta
Deal found 7/23![Delta logo]()
$145
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/313:25 pm
SDF
- ONT
2 stops10h 34m
United Airlines
Deal found 7/27![United Airlines logo]()
$150
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/177:55 am
SDF
- ONT
2 stops14h 30m
Southwest
Deal found 7/27![Southwest logo]()
$156
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/712:05 pm
SDF
- ONT
2 stops8h 35m
Southwest
Deal found 7/27![Southwest logo]()
$168
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:35 am
SDF
- ONT
2 stops13h 05m
Southwest
Deal found 7/27![Southwest logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/179:10 pm
SDF
- ONT
3 stops53h 40m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$180
This KAYAK deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
SDF
- ONT
1 stop7h 42m
Delta
Deal found 7/23![Delta logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/267:08 pm
SDF
- ONT
3 stops45h 32m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3111:19 am
SDF
- ONT
3 stops39h 31m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$192
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 8/139:00 am
SDF
- ONT
2 stops12h 11m
United Airlines
Deal found 7/23![United Airlines logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:15 am
SDF
- ONT
3 stops39h 32m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$199
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” 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 8/255:15 am
SDF
- ONT
2 stops10h 35m
United Airlines
Deal found 7/24![United Airlines logo]()
$200
Find flight deals from Louisville to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Louisville (SDF) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $289 (Southwest) |
One-way from | $145 (United Airlines) |
Popular in | November |
Cheapest in | March |
Average price | $486 |
Cheapflights Fare Finder
Customize your flight search to find flights from Louisville 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 July 28, 2026.
Use the filters below to find and compare flights from Louisville to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Thu 9/10
11:05 am-3:05 pm
1 stop7h 00m
Ontario
Mon 9/14
11:55 pm-11:15 am
1 stop8h 20m
$289
Quickest round-trip
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Tue 9/1
7:05 am-10:42 am
1 stop6h 37m
Ontario
Sat 9/5
12:00 pm-10:08 pm
1 stop7h 08m
$299
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Wed 9/2
7:05 am-10:42 am
1 stop6h 37m
Ontario
Sat 9/12
12:17 pm-11:59 pm
1 stop8h 42m
$299
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Fri 10/30
7:00 am-11:08 am
1 stop7h 08m
Ontario
Tue 11/3
12:18 pm-12:02 am
1 stop8h 44m
$304
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Thu 8/27
3:25 pm-9:52 pm
1 stop9h 27m
Ontario
Wed 9/2
12:00 pm-12:24 am
1 stop9h 24m
$339
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Fri 9/4
5:50 pm-9:52 pm
1 stop7h 02m
Ontario
Mon 9/14
10:00 pm-10:19 am
1 stop9h 19m
$388
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Sun 10/25
7:00 am-11:08 am
1 stop7h 08m
Ontario
Wed 10/28
12:18 pm-10:35 pm
1 stop7h 17m
$388
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Tue 8/25
5:45 pm-10:35 pm
1 stop7h 50m
Ontario
Tue 9/1
9:15 am-7:59 pm
1 stop7h 44m
$389
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Sat 10/3
3:36 pm-8:58 pm
1 stop8h 22m
Ontario
Wed 10/7
1:24 pm-10:32 pm
1 stop6h 08m
$389
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Thu 10/29
3:24 pm-8:51 pm
1 stop8h 27m
Ontario
Mon 11/2
5:00 am-2:22 pm
1 stop6h 22m
$389
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Louisville to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Louisville to Ontario in July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Louisville-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Louisville-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Louisville-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Louisville-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Louisville-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Louisville to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Louisville with our price prediction graph.
SDF-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 Louisville to Ontario
What is the cheapest month to book a flight from Louisville to Ontario?
Currently, March is the cheapest month in which you can book a flight from Louisville to Ontario (average of $359). Flying from Louisville 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 Louisville to Ontario?
Airfare is below average for this route at the moment.
Louisville to Ontario flights typically cost between $407 and $507 in August.The cheapest round-trip price found within the last 5 days was $289 on Delta (Aug 26-Sep 1).
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 July 28, 2026.
Get a feel of what it's like to fly with Southwest and American Airlines from Louisville to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Related info for your journey
Find useful and relevant information for your journey from Louisville 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
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Ontario flight routes
Other flight options
Other flights from Louisville
Popular flights
Alternative routes for Louisville 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 Louisville to Ontario by cabin class
Find flights from Louisville 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 July 28, 2026.
Louisville and Ontario flights
Browse other Louisville and Ontario flight options. Last updated on July 28, 2026.
Other flights from Louisville
Browse through other flights departing from Louisville. Flights are based on user searches made on Cheapflights and were last updated on July 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Louisville to Ontario
Discover the top 2 airlines that operate flights from Louisville 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 July 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$434 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$331 | Average$486 | FlexibilityNo cancel fee | On-time63% |