HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Louisville

$105+ 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SDF
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

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 September 15, 2025.

Round-trip from

$288
(American Airlines)

One-way from

$105
(Southwest)

Popular in

November

Cheapest in

February

Average price

$506
From Ontario to Louisville Intl
Search Deals
One-way flight from Ontario to Louisville Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Ontario to Louisville

Cheapest flights from Ontario to Louisville
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 September 15, 2025.

This American Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 10/256:15 amONT - SDF
2 stops11h 06mAmerican Airlines
Tue 10/284:28 pmSDF - ONT
1 stop8h 08mAmerican Airlines
Deal found 9/14$288
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:05 amONT - SDF
1 stop28h 57mMultiple Airlines
Sun 10/122:57 pmSDF - ONT
1 stop23h 50mMultiple Airlines
Deal found 9/14$307
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/2411:53 amONT - SDF
2 stops31h 54mMultiple Airlines
Mon 10/272:57 pmSDF - ONT
1 stop10h 08mMultiple Airlines
Deal found 9/14$308
This Southwest deal was found by Cheapflights users on 9/14. 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 10/255:25 amONT - SDF
1 stop7h 45mSouthwest
Tue 10/288:10 amSDF - ONT
1 stop8h 35mSouthwest
Deal found 9/14$334
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/312:13 pmONT - SDF
2 stops18h 06mMultiple Airlines
Mon 10/62:57 pmSDF - ONT
1 stop8h 59mMultiple Airlines
Deal found 9/15$358
This Southwest deal was found by Cheapflights users on 9/14. 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 10/2412:50 pmONT - SDF
1 stop8h 20mSouthwest
Mon 10/275:30 pmSDF - ONT
1 stop8h 20mSouthwest
Deal found 9/14$365
This American Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 12/2310:50 amONT - SDF
1 stop7h 44mAmerican Airlines
Tue 12/306:35 amSDF - ONT
1 stop8h 18mAmerican Airlines
Deal found 9/14$368
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 9/2912:13 pmONT - SDF
2 stops18h 06mMultiple Airlines
Fri 10/39:43 amSDF - ONT
1 stop16h 55mMultiple Airlines
Deal found 9/14$369
This United Airlines deal was found by Cheapflights users on 9/13. 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 10/206:36 pmONT - SDF
2 stops12h 25mUnited Airlines
Thu 10/233:30 pmSDF - ONT
1 stop7h 54mUnited Airlines
Deal found 9/13$371
This Delta deal was found by Cheapflights users on 9/14. 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 10/2410:00 pmONT - SDF
2 stops13h 20mDelta
Mon 10/276:05 pmSDF - ONT
2 stops8h 34mDelta
Deal found 9/14$375

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 September 15, 2025.
Use the filters below to find and compare flights from Ontario to Louisville that are best for you.

Fly from

Ontario

Fly to

Louisville

Route

Depart

Return

Price

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 10/25

5:25 am-4:10 pm

1 stop7h 45m

Louisville Intl

Tue 10/28

8:10 am-1:45 pm

1 stop8h 35m

$334

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Fri 10/24

12:50 pm-12:10 am

1 stop8h 20m

Louisville Intl

Mon 10/27

5:30 pm-10:50 pm

1 stop8h 20m

$365

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Thu 10/9

6:54 pm-2:02 pm

1 stop16h 08m

Louisville Intl

Sun 10/12

8:10 pm-10:05 pm

2 stops28h 55m

$369

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Fri 10/24

10:00 pm-2:20 pm

2 stops13h 20m

Louisville Intl

Mon 10/27

6:05 pm-11:39 pm

2 stops8h 34m

$375

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Fri 10/3

10:00 pm-9:27 am

1 stop8h 27m

Louisville Intl

Tue 10/7

6:00 am-10:26 am

1 stop7h 26m

$381

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Thu 10/2

3:40 pm-12:35 am

1 stop5h 55m

Louisville Intl

Tue 10/7

6:00 am-10:35 am

2 stops7h 35m

$386

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 10/4

11:55 am-9:35 pm

1 stop6h 40m

Louisville Intl

Tue 10/7

6:00 am-10:26 am

1 stop7h 26m

$398

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Tue 12/23

11:59 pm-10:08 am

1 stop7h 09m

Louisville Intl

Tue 12/30

6:43 am-11:53 am

1 stop8h 10m

$399

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Wed 1/7

1:20 pm-10:44 pm

1 stop6h 24m

Louisville Intl

Sat 1/10

9:00 am-12:47 pm

1 stop6h 47m

$424

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Wed 12/31

12:45 pm-9:34 pm

1 stop5h 49m

Louisville Intl

Sat 1/3

6:44 am-11:53 am

1 stop8h 09m

$427

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

Showing 1-10 of 17 results
1
2

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.
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, January is the cheapest month in which you can book a flight from Ontario to Louisville (average of $299). Flying from Ontario to Louisville in April is currently the most expensive (average of $369). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to SDF?

Find hourly flight availability from Ontario to Louisville. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 9% on flights from Ontario to Louisville by exploring options for tickets in the evening.

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 September 15, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United 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.
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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.

  • What airports do I use to fly from Ontario to Louisville?

    Louisville Intl is the airport most travelers will use when flying to Louisville from Ontario. Booking flights from Ontario (ONT) to Louisville Intl (SDF) should be relatively easy as there is 1 daily flight to Louisville from 4 different airlines. 5h 44m is how long a flight from Ontario to Louisville Intl will take if you book a nonstop flight.

  • How long is the flight from Ontario to Louisville?

    Airlines like Southwest and Delta fly from Ontario to Louisville in about 7h 45m. The time it takes to get you to your destination can typically vary by up to 5h 35m. There are 1791 mi between Ontario and Louisville. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Ontario to Louisville round-trip?

    Flying on American Airlines is currently your cheapest option to Louisville, with prices starting at $342. Additional round-trip tickets that might be worth considering are offered by Southwest and Delta, with the lowest prices starting at $342 and $346, respectively. American Airlines is currently priced 29% below the average price you’ll pay for this route.

  • Can I find deals for flights from Ontario to Louisville that include hotel bookings?

    Yes. In addition to deals on Ontario to Louisville flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Louisville?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Louisville.

  • Can I find deals for business class flights from Ontario to Louisville?

    Yes. Cheapflights offers flight deals from Ontario to Louisville by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Louisville?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Louisville (average of $299). Flying from Ontario to Louisville in April is currently the most expensive (average of $369). 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.

See more FAQs

Traveling to a place near Louisville?

Book flights to Louisville if you plan to visit one of these locations
Shepherdsville
Jeffersonville
Elizabethtown
Corydon
Bardstown

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 for Ontario to Louisville

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Nashville flights
San Francisco to Nashville flights
Ontario to Nashville flights
Santa Ana to Nashville flights
Burbank to Nashville flights
Los Angeles to Cincinnati flights
Sacramento to Nashville flights
San Diego to Nashville flights
San Jose to Nashville flights
Los Angeles to Knoxville flights
Las Vegas to Nashville flights
Oakland to Nashville flights
San Francisco to Cincinnati flights
Los Angeles to Louisville flights
Long Beach to Nashville flights
Ontario to Cincinnati flights
San Diego to Knoxville flights
San Francisco to Knoxville flights
San Diego to Cincinnati flights
Santa Ana to Cincinnati flights
Bakersfield to Nashville flights
Sacramento to Cincinnati flights
Ontario to Knoxville flights
Fresno to Nashville flights
Las Vegas to Cincinnati flights
Reno to Nashville flights
Sacramento to Knoxville flights
Palm Springs to Nashville flights
Los Angeles to Lexington flights
San Diego to Lexington flights
Las Vegas to Knoxville flights
Santa Ana to Louisville flights
Santa Ana to Knoxville flights
San Francisco to Louisville flights
Burbank to Cincinnati flights
San Luis Obispo to Nashville flights
San Jose to Cincinnati flights
San Jose to Knoxville flights
San Diego to Louisville flights
Santa Rosa to Nashville flights
San Francisco to Lexington flights
Ontario to Lexington flights
Sacramento to Louisville flights
Fresno to Louisville flights
Oakland to Cincinnati flights
Reno to Knoxville flights
Santa Ana to Lexington flights
Burbank to Knoxville flights
Las Vegas to Lexington flights

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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$342Average$481FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$342Average$519FlexibilityNo cancel feeOn-time71%
DeltaCheapest$346Average$466FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$407Average$700FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.