$147+ 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SDF
Jul 11 — Jul 181
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
Cheapest
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 June 11, 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 June 11, 2026.
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 10/3012:35 pm
ONT
- SDF
1 stop7h 31m
American Airlines
Tue 11/38:14 pm
SDF
- ONT
1 stop6h 43m
American Airlines
Deal found 6/10![American Airlines logo]()
$314
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:30 am
ONT
- SDF
1 stop7h 40m
Southwest
Wed 7/225:35 am
SDF
- ONT
1 stop9h 30m
Southwest
Deal found 6/8![Southwest logo]()
$351
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/310:00 pm
ONT
- SDF
1 stop9h 32m
Delta
Tue 7/77:05 am
SDF
- ONT
1 stop6h 33m
Delta
Deal found 6/10![Delta logo]()
$356
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/98:35 am
ONT
- SDF
1 stop6h 20m
Southwest
Mon 9/1410:40 am
SDF
- ONT
1 stop6h 20m
Southwest
Deal found 6/8![Southwest logo]()
$359
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 9/102:40 pm
ONT
- SDF
1 stop5h 25m
Southwest
Mon 9/143:05 pm
SDF
- ONT
2 stops9h 40m
Southwest
Deal found 6/10![Southwest logo]()
$361
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 8/712:33 pm
ONT
- SDF
1 stop6h 44m
American Airlines
Thu 8/136:05 am
SDF
- ONT
2 stops8h 58m
American Airlines
Deal found 6/10![American Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/711:55 pm
ONT
- SDF
1 stop7h 10m
Southwest
Wed 7/155:35 am
SDF
- ONT
1 stop9h 30m
Southwest
Deal found 6/11![Southwest logo]()
$375
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 June 11, 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 June 11, 2026.
This Delta deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/512:00 pm
ONT
- SDF
1 stop9h 09m
Delta
Sun 9/67:05 am
SDF
- ONT
1 stop6h 37m
Delta
Deal found 6/6![Delta logo]()
$361
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 8/189:15 am
ONT
- SDF
2 stops11h 44m
United Airlines
Wed 8/198:00 am
SDF
- ONT
1 stop7h 50m
United Airlines
Deal found 6/10![United Airlines logo]()
$398
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 9/102:40 pm
ONT
- SDF
1 stop5h 25m
Southwest
Mon 9/1410:40 am
SDF
- ONT
1 stop6h 20m
Southwest
Deal found 6/10![Southwest logo]()
$406
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/197:00 am
ONT
- SDF
1 stop9h 07m
United Airlines
Tue 9/223:25 pm
SDF
- ONT
1 stop8h 28m
United Airlines
Deal found 6/10![United Airlines logo]()
$434
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/112:40 pm
ONT
- SDF
1 stop5h 25m
Southwest
Mon 9/1410:40 am
SDF
- ONT
1 stop6h 20m
Southwest
Deal found 6/7![Southwest logo]()
$457
This Delta deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/512:00 pm
ONT
- SDF
1 stop9h 24m
Delta
Sun 8/97:05 am
SDF
- ONT
1 stop6h 37m
Delta
Deal found 6/6![Delta logo]()
$493
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/252:40 pm
ONT
- SDF
1 stop5h 25m
Southwest
Sun 9/276:10 am
SDF
- ONT
1 stop6h 20m
Southwest
Deal found 6/7![Southwest logo]()
$457
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/35:00 am
ONT
- SDF
1 stop6h 34m
United Airlines
Mon 10/56:16 pm
SDF
- ONT
1 stop7h 33m
United Airlines
Deal found 6/6![United Airlines logo]()
$529
This Southwest deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/11:20 pm
ONT
- SDF
1 stop7h 55m
Southwest
Mon 7/66:05 pm
SDF
- ONT
2 stops7h 35m
Southwest
Deal found 6/9![Southwest logo]()
$489
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:10 am
ONT
- SDF
1 stop9h 46m
United Airlines
Mon 8/103:25 pm
SDF
- ONT
1 stop8h 17m
United Airlines
Deal found 6/9![United Airlines logo]()
$532
Last-minute flights from Ontario to LouisvilleDiscover last-minute flight deals from Ontario to Louisville. Data last updated June 11, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Louisville. Data last updated June 11, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/310:00 pm
ONT
- SDF
1 stop9h 32m
Delta
Tue 7/77:05 am
SDF
- ONT
1 stop6h 33m
Delta
Deal found 6/10![Delta logo]()
$356
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/310:00 pm
ONT
- SDF
1 stop9h 32m
Delta
Wed 7/81:02 pm
SDF
- ONT
1 stop8h 28m
Delta
Deal found 6/10![Delta logo]()
$380
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/310:00 pm
ONT
- SDF
1 stop9h 32m
Delta
Sat 7/117:09 am
SDF
- ONT
1 stop6h 29m
Delta
Deal found 6/10![Delta logo]()
$381
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/411:50 am
ONT
- SDF
1 stop9h 31m
Delta
Tue 7/77:05 am
SDF
- ONT
1 stop6h 33m
Delta
Deal found 6/10![Delta logo]()
$385
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/411:50 am
ONT
- SDF
1 stop9h 31m
Delta
Sat 7/117:09 am
SDF
- ONT
1 stop6h 29m
Delta
Deal found 6/10![Delta logo]()
$410
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/711:55 pm
ONT
- SDF
1 stop7h 10m
Southwest
Wed 7/155:35 am
SDF
- ONT
1 stop9h 30m
Southwest
Deal found 6/11![Southwest logo]()
$375
This American Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/157:15 pm
ONT
- SDF
2 stops12h 24m
American Airlines
Wed 7/296:38 am
SDF
- ONT
1 stop8h 07m
American Airlines
Deal found 6/9![American Airlines logo]()
$413
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:30 am
ONT
- SDF
1 stop7h 40m
Southwest
Wed 7/225:35 am
SDF
- ONT
1 stop9h 30m
Southwest
Deal found 6/8![Southwest logo]()
$351
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2211:48 am
ONT
- SDF
1 stop9h 38m
Delta
Thu 7/306:00 am
SDF
- ONT
1 stop7h 38m
Delta
Deal found 6/10![Delta logo]()
$404
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/221:11 pm
ONT
- SDF
2 stops7h 35m
American Airlines
Thu 7/306:38 am
SDF
- ONT
1 stop8h 07m
American Airlines
Deal found 6/10![American Airlines logo]()
$409
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 June 11, 2026.
Search for one-way flight options from Ontario to Louisville. Find affordable one-way fares based on user searches. Data last updated June 11, 2026.
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/712:00 pm
ONT
- SDF
1 stop7h 35m
Delta
Deal found 6/8![Delta logo]()
$147
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/811:55 pm
ONT
- SDF
1 stop7h 30m
Southwest
Deal found 6/7![Southwest logo]()
$201
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1610:59 pm
ONT
- SDF
1 stop6h 51m
Delta
Deal found 6/8![Delta logo]()
$208
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/810:00 pm
ONT
- SDF
1 stop7h 54m
Delta
Deal found 6/8![Delta logo]()
$211
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/35:00 am
ONT
- SDF
1 stop6h 34m
United Airlines
Deal found 6/8![United Airlines logo]()
$228
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/610:00 pm
ONT
- SDF
1 stop7h 46m
Delta
Deal found 6/7![Delta logo]()
$229
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/45:00 am
ONT
- SDF
1 stop6h 28m
United Airlines
Deal found 6/9![United Airlines logo]()
$231
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/99:36 am
ONT
- SDF
2 stops31h 44m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$233
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/181:18 pm
ONT
- SDF
1 stop6h 41m
United Airlines
Deal found 6/9![United Airlines logo]()
$251
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/512:00 pm
ONT
- SDF
1 stop9h 24m
Delta
Deal found 6/7![Delta logo]()
$259
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/86:00 am
ONT
- SDF
3 stops33h 07m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$270
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 June 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $314 (American Airlines) |
One-way from | $147 (Delta) |
Popular in | January |
Cheapest in | July |
Average price | $553 |
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 June 11, 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
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Sat 9/5
12:00 pm-12:09 am
1 stop9h 09m
Louisville Intl
Sun 9/6
7:05 am-10:42 am
1 stop6h 37m
$361
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Tue 8/18
9:15 am-11:59 pm
2 stops11h 44m
Louisville Intl
Wed 8/19
8:00 am-12:50 pm
1 stop7h 50m
$398
Quickest round-trip
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Thu 9/10
2:40 pm-11:05 pm
1 stop5h 25m
Louisville Intl
Mon 9/14
10:40 am-2:00 pm
1 stop6h 20m
$406
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Sat 9/19
7:00 am-7:07 pm
1 stop9h 07m
Louisville Intl
Tue 9/22
3:25 pm-8:53 pm
1 stop8h 28m
$434
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Fri 9/11
2:40 pm-11:05 pm
1 stop5h 25m
Louisville Intl
Mon 9/14
10:40 am-2:00 pm
1 stop6h 20m
$457
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Fri 9/25
2:40 pm-11:05 pm
1 stop5h 25m
Louisville Intl
Sun 9/27
6:10 am-9:30 am
1 stop6h 20m
$457
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Wed 7/1
1:20 pm-12:15 am
1 stop7h 55m
Louisville Intl
Mon 7/6
6:05 pm-10:40 pm
2 stops7h 35m
$489
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Wed 8/5
12:00 pm-12:24 am
1 stop9h 24m
Louisville Intl
Sun 8/9
7:05 am-10:42 am
1 stop6h 37m
$493
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Sat 10/3
5:00 am-2:34 pm
1 stop6h 34m
Louisville Intl
Mon 10/5
6:16 pm-10:49 pm
1 stop7h 33m
$529
OntarioLouisville
ONT - SDF
ONTSDF
Ontario
Tue 8/4
6:10 am-6:56 pm
1 stop9h 46m
Louisville Intl
Mon 8/10
3:25 pm-8:42 pm
1 stop8h 17m
$532
Showing 1-10 of 22 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 June.
| 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, July is the cheapest month in which you can book a flight from Ontario to Louisville (average of $356). 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 June 11, 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.
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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 locationsCorydon
Shepherdsville
Elizabethtown
Jeffersonville
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Other flights to Louisville
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Ontario and Louisville flights
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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 June 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$238 | Average$522 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$341 | Average$468 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$343 | Average$489 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$387 | Average$471 | FlexibilityNo cancel fee | On-time71% |