$171+ Cheap flights from Ontario to Louisville (ONT - SDF)
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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SDF
May 29 — Jun 51
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Louisville 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 Ontario to Louisville
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Best
Last-minute
One-way
Cheapest flights from Ontario to LouisvilleExplore the most affordable flight options available from Ontario to Louisville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2026.
Explore the most affordable flight options available from Ontario to Louisville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2026.
This Delta deal was found by Cheapflights users on 4/25. 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.
Tue 5/1912:08 pm
ONT
- SDF
1 stop6h 43m
Delta
Tue 5/263:29 pm
SDF
- ONT
1 stop9h 19m
Delta
Deal found 4/25![Delta logo]()
$341
This Delta deal was found by Cheapflights users on 4/24. 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.
Mon 5/2512:07 pm
ONT
- SDF
1 stop9h 18m
Delta
Tue 6/26:00 am
SDF
- ONT
1 stop7h 57m
Delta
Deal found 4/24![Delta logo]()
$348
This Delta deal was found by Cheapflights users on 4/25. 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.
Sat 5/2310:00 pm
ONT
- SDF
1 stop9h 20m
Delta
Sat 5/305:47 pm
SDF
- ONT
1 stop7h 01m
Delta
Deal found 4/25![Delta logo]()
$355
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3010:00 pm
ONT
- SDF
1 stop7h 56m
Delta
Sat 6/65:50 pm
SDF
- ONT
1 stop6h 58m
Delta
Deal found 4/27![Delta logo]()
$356
This American Airlines deal was found by Cheapflights users on 4/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:24 am
ONT
- SDF
2 stops10h 49m
American Airlines
Sat 5/235:43 pm
SDF
- ONT
1 stop7h 53m
American Airlines
Deal found 4/26![American Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 4/24. 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.
Mon 5/259:50 am
ONT
- SDF
2 stops11h 35m
Delta
Mon 6/11:00 pm
SDF
- ONT
1 stop8h 36m
Delta
Deal found 4/24![Delta logo]()
$360
This Delta deal was found by Cheapflights users on 4/25. 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 5/2010:00 pm
ONT
- SDF
1 stop7h 56m
Delta
Sun 5/241:00 pm
SDF
- ONT
1 stop8h 36m
Delta
Deal found 4/25![Delta logo]()
$381
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/97:05 am
ONT
- SDF
1 stop7h 44m
Delta
Wed 6/245:59 pm
SDF
- ONT
2 stops8h 50m
Delta
Deal found 4/27![Delta logo]()
$385
This Delta deal was found by Cheapflights users on 4/25. 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.
Sat 5/1612:07 pm
ONT
- SDF
1 stop7h 04m
Delta
Sun 5/241:00 pm
SDF
- ONT
1 stop8h 36m
Delta
Deal found 4/25![Delta logo]()
$388
Best flights from Ontario to LouisvilleDiscover carefully curated flight deals from Ontario to Louisville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 29, 2026.
Discover carefully curated flight deals from Ontario to Louisville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 29, 2026.
This Delta deal was found by Cheapflights users on 4/26. 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.
Tue 5/1912:08 pm
ONT
- SDF
1 stop6h 43m
Delta
Fri 6/266:00 am
SDF
- ONT
1 stop7h 40m
Delta
Deal found 4/26![Delta logo]()
$399
This United Airlines deal was found by Cheapflights users on 4/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:30 am
ONT
- SDF
1 stop9h 33m
United Airlines
Mon 6/15:46 pm
SDF
- ONT
1 stop8h 00m
United Airlines
Deal found 4/26![United Airlines logo]()
$525
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/219:55 pm
ONT
- SDF
2 stops9h 00m
Southwest
Mon 5/252:40 pm
SDF
- ONT
2 stops9h 00m
Southwest
Deal found 4/28![Southwest logo]()
$553
This Alaska Airlines deal was found by Cheapflights users on 4/24. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:41 pm
ONT
- SDF
2 stops11h 36m
Alaska Airlines
Tue 6/92:36 pm
SDF
- ONT
2 stops12h 22m
Alaska Airlines
Deal found 4/24![Alaska Airlines logo]()
$579
This Delta deal was found by Cheapflights users on 4/28. 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 5/2112:07 pm
ONT
- SDF
1 stop9h 18m
Delta
Mon 5/255:47 pm
SDF
- ONT
1 stop7h 01m
Delta
Deal found 4/28![Delta logo]()
$447
This Delta deal was found by Cheapflights users on 4/26. 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 5/286:00 am
ONT
- SDF
2 stops12h 18m
Delta
Sun 5/316:00 am
SDF
- ONT
1 stop7h 57m
Delta
Deal found 4/26![Delta logo]()
$462
This United Airlines deal was found by Cheapflights users on 4/28. 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 5/266:30 am
ONT
- SDF
1 stop9h 32m
United Airlines
Tue 6/23:25 pm
SDF
- ONT
1 stop8h 17m
United Airlines
Deal found 4/28![United Airlines logo]()
$531
This United Airlines deal was found by Cheapflights users on 4/28. 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 5/196:00 am
ONT
- SDF
2 stops13h 31m
United Airlines
Wed 5/205:36 am
SDF
- ONT
2 stops10h 02m
United Airlines
Deal found 4/28![United Airlines logo]()
$535
This Delta deal was found by Cheapflights users on 4/25. 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 5/1512:07 pm
ONT
- SDF
1 stop7h 29m
Delta
Sun 5/241:00 pm
SDF
- ONT
1 stop8h 36m
Delta
Deal found 4/25![Delta logo]()
$499
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Fri 5/221:18 pm
ONT
- SDF
1 stop6h 41m
United Airlines
Sun 5/245:51 pm
SDF
- ONT
1 stop8h 00m
United Airlines
Deal found 4/28![United Airlines logo]()
$569
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:55 pm
ONT
- SDF
2 stops13h 25m
Delta
Sun 5/316:00 am
SDF
- ONT
2 stops9h 19m
Delta
Deal found 4/27![Delta logo]()
$525
Last-minute flights from Ontario to LouisvilleDiscover last-minute flight deals from Ontario to Louisville. Data last updated April 29, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Louisville. Data last updated April 29, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 4/25. 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.
Sat 5/1612:07 pm
ONT
- SDF
1 stop7h 04m
Delta
Sun 5/241:00 pm
SDF
- ONT
1 stop8h 36m
Delta
Deal found 4/25![Delta logo]()
$388
This Delta deal was found by Cheapflights users on 4/25. 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.
Tue 5/1912:08 pm
ONT
- SDF
1 stop6h 43m
Delta
Tue 5/263:29 pm
SDF
- ONT
1 stop9h 19m
Delta
Deal found 4/25![Delta logo]()
$341
This Delta deal was found by Cheapflights users on 4/24. 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 5/1910:00 pm
ONT
- SDF
1 stop7h 56m
Delta
Fri 6/266:00 am
SDF
- ONT
1 stop7h 40m
Delta
Deal found 4/24![Delta logo]()
$399
This American Airlines deal was found by Cheapflights users on 4/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:24 am
ONT
- SDF
2 stops10h 49m
American Airlines
Sat 5/235:43 pm
SDF
- ONT
1 stop7h 53m
American Airlines
Deal found 4/26![American Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 4/25. 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 5/2010:00 pm
ONT
- SDF
1 stop7h 56m
Delta
Sun 5/241:00 pm
SDF
- ONT
1 stop8h 36m
Delta
Deal found 4/25![Delta logo]()
$381
This Delta deal was found by Cheapflights users on 4/25. 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.
Sat 5/2310:00 pm
ONT
- SDF
1 stop9h 20m
Delta
Sat 5/305:47 pm
SDF
- ONT
1 stop7h 01m
Delta
Deal found 4/25![Delta logo]()
$355
This Delta deal was found by Cheapflights users on 4/24. 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.
Mon 5/2512:07 pm
ONT
- SDF
1 stop9h 18m
Delta
Tue 6/26:00 am
SDF
- ONT
1 stop7h 57m
Delta
Deal found 4/24![Delta logo]()
$348
This Delta deal was found by Cheapflights users on 4/24. 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.
Mon 5/259:50 am
ONT
- SDF
2 stops11h 35m
Delta
Mon 6/11:00 pm
SDF
- ONT
1 stop8h 36m
Delta
Deal found 4/24![Delta logo]()
$360
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3010:00 pm
ONT
- SDF
1 stop7h 56m
Delta
Sat 6/65:50 pm
SDF
- ONT
1 stop6h 58m
Delta
Deal found 4/27![Delta logo]()
$356
One-way flights from Ontario to LouisvilleSearch for one-way flight options from Ontario to Louisville. Find affordable one-way fares based on user searches. Data last updated April 29, 2026.
Search for one-way flight options from Ontario to Louisville. Find affordable one-way fares based on user searches. Data last updated April 29, 2026.
This Delta deal was found by Cheapflights users on 4/24. 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 5/2610:00 pm
ONT
- SDF
1 stop7h 56m
Delta
Deal found 4/24![Delta logo]()
$171
This Delta deal was found by Cheapflights users on 4/28. 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 5/2810:00 pm
ONT
- SDF
1 stop7h 56m
Delta
Deal found 4/28![Delta logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 4/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/58:06 pm
ONT
- SDF
3 stops43h 09m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Fri 5/298:06 pm
ONT
- SDF
3 stops34h 22m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$209
This Delta deal was found by Cheapflights users on 4/24. 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 5/247:05 am
ONT
- SDF
1 stop6h 56m
Delta
Deal found 4/24![Delta logo]()
$211
This American Airlines deal was found by Cheapflights users on 4/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/296:10 am
ONT
- SDF
2 stops9h 50m
American Airlines
Deal found 4/27![American Airlines logo]()
$216
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Wed 5/205:00 am
ONT
- SDF
1 stop6h 41m
United Airlines
Deal found 4/27![United Airlines logo]()
$221
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/318:06 pm
ONT
- SDF
3 stops57h 30m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$222
This Delta deal was found by Cheapflights users on 4/28. 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 6/510:00 pm
ONT
- SDF
1 stop8h 51m
Delta
Deal found 4/28![Delta logo]()
$229
This United Airlines deal was found by Cheapflights users on 4/25. 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.
Sat 5/236:39 pm
ONT
- SDF
2 stops11h 48m
United Airlines
Deal found 4/25![United Airlines logo]()
$233
Find flight deals from Ontario to Louisville
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Louisville (SDF). 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 April 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $341 (Delta) |
One-way from | $171 (Delta) |
Popular in | January |
Cheapest in | August |
Average price | $479 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Louisville 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 April 29, 2026.
Use the filters below to find and compare flights from Ontario to Louisville that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Tue 5/19
12:08 pm-9:51 pm
1 stop6h 43m
Louisville Intl
Fri 6/26
6:00 am-10:40 am
1 stop7h 40m
$399
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Thu 5/21
12:07 pm-12:25 am
1 stop9h 18m
Louisville Intl
Mon 5/25
5:47 pm-9:48 pm
1 stop7h 01m
$447
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Thu 5/28
6:00 am-9:18 pm
2 stops12h 18m
Louisville Intl
Sun 5/31
6:00 am-10:57 am
1 stop7h 57m
$462
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Fri 5/15
12:07 pm-10:36 pm
1 stop7h 29m
Louisville Intl
Sun 5/24
1:00 pm-6:36 pm
1 stop8h 36m
$499
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Wed 5/27
6:30 am-7:03 pm
1 stop9h 33m
Louisville Intl
Mon 6/1
5:46 pm-10:46 pm
1 stop8h 00m
$525
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Sat 5/23
5:55 pm-10:20 am
2 stops13h 25m
Louisville Intl
Sun 5/31
6:00 am-12:19 pm
2 stops9h 19m
$525
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Tue 5/26
6:30 am-7:02 pm
1 stop9h 32m
Louisville Intl
Tue 6/2
3:25 pm-8:42 pm
1 stop8h 17m
$531
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Tue 5/19
6:00 am-10:31 pm
2 stops13h 31m
Louisville Intl
Wed 5/20
5:36 am-12:38 pm
2 stops10h 02m
$535
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Thu 5/21
9:55 pm-9:55 am
2 stops9h 00m
Louisville Intl
Mon 5/25
2:40 pm-8:40 pm
2 stops9h 00m
$553
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Fri 5/22
1:18 pm-10:59 pm
1 stop6h 41m
Louisville Intl
Sun 5/24
5:51 pm-10:51 pm
1 stop8h 00m
$569
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Ontario to Louisville
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 Ontario to Louisville in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Louisville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Louisville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Louisville flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Louisville 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 Ontario-Louisville 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 Ontario to Louisville
Have a flexible travel schedule? Discover the best time to fly to Louisville from Ontario with our price prediction graph.
ONT-SDF
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 Ontario to Louisville
What is the cheapest month to book a flight from Ontario to Louisville?
Currently, August is the cheapest month in which you can book a flight from Ontario to Louisville (average of $406). Flying from Ontario to Louisville in January is currently the most expensive (average of $976). 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 Ontario to Louisville?
Reviews of airlines servicing Louisville
Get insights into the airlines that provide service to Louisville. 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 Louisville. Reviews last updated April 29, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from Ontario to Louisville. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to Louisville. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Louisville?
Book flights to Louisville if you plan to visit one of these locationsShepherdsville
Elizabethtown
Corydon
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Top 4 airlines flying from Ontario to Louisville
Discover the top 4 airlines that operate flights from Ontario to Louisville. 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 April 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$238 | Average$546 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$341 | Average$457 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$343 | Average$477 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$388 | Average$497 | FlexibilityNo cancel fee | On-time71% |