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$209+ 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 3/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SDF
Jan 25 — Feb 11
Sat 1/25
Sat 2/1
1 adult, Economy
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The best prices from Ontario to Louisville Intl are usually found in August or April, booked 83 days in advance, depart on a Saturday or Friday and return on a Thursday

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 January 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$347
(Delta)

One-way from

$209
(American Airlines)

Popular in

March

Cheapest in

August

Average price

$503
Provider with most accurate pricing for Ontario-Louisville Intl flight deals.
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Provider most trusted by Cheapflights users for Ontario-Louisville Intl flights.
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From Ontario to Louisville Intl
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One-way flight from Ontario to Louisville Intl
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High demand for flights, 1% potential price rise
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Best time to find cheap flights, 1% potential price drop
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Average for round-trip flights in January 2025
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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 January 20, 2025.

This Delta deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/87:05 amONT - SDF
1 stop7h 38mDelta
Sat 2/155:00 pmSDF - ONT
1 stop8h 52mDelta
Deal found 1/20$347
This United Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/126:15 amONT - SDF
2 stops10h 33mUnited Airlines
Sat 2/1510:05 amSDF - ONT
2 stops13h 35mUnited Airlines
Deal found 1/20$357
This Southwest deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/128:40 amONT - SDF
1 stop7h 10mSouthwest
Sun 3/166:50 pmSDF - ONT
1 stop8h 20mSouthwest
Deal found 1/19$402
This American Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2211:59 pmONT - SDF
1 stop7h 26mAmerican Airlines
Sun 4/277:05 amSDF - ONT
1 stop7h 41mAmerican Airlines
Deal found 1/19$412
This Alaska Airlines deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/224:05 pmONT - SDF
2 stops15h 17mAlaska Airlines
Thu 9/256:09 amSDF - ONT
2 stops15h 08mAlaska Airlines
Deal found 1/19$578

Find flights from Ontario to Louisville within your budget

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 January 20, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 2/8

7:05 am-5:43 pm

1 stop7h 38m

Louisville Intl

Sat 2/15

5:00 pm-10:52 pm

1 stop8h 52m

$347

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Wed 2/12

6:15 am-7:48 pm

2 stops10h 33m

Louisville Intl

Sat 2/15

10:05 am-8:40 pm

2 stops13h 35m

$357

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Wed 3/12

8:40 am-6:50 pm

1 stop7h 10m

Louisville Intl

Sun 3/16

6:50 pm-12:10 am

1 stop8h 20m

$402

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Tue 4/22

11:59 pm-10:25 am

1 stop7h 26m

Louisville Intl

Sun 4/27

7:05 am-11:46 am

1 stop7h 41m

$412

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Tue 2/4

6:00 am-9:54 pm

2 stops12h 54m

Louisville Intl

Fri 2/7

11:13 am-10:39 pm

2 stops14h 26m

$618

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Mon 3/31

11:59 pm-10:20 am

1 stop7h 21m

$209

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 5/3

5:15 pm-9:51 am

2 stops13h 36m

$214

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 2/8

6:15 am-10:12 pm

2 stops12h 57m

$224

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sun 3/30

3:55 pm-12:35 am

1 stop5h 40m

$249

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Fri 2/28

6:00 am-9:55 pm

2 stops12h 55m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/18

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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.

Travel insights for flights from Ontario to Louisville

Get recent, data-driven insights about flights from Ontario to Louisville including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Ontario to Louisville?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Louisville. Price data was last updated on January 17, 2025.

Booking 81 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Louisville. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 January 20, 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.

Rainfall in Louisville by month

Plan your trip to Louisville by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Louisville ranges from 3.1 - 5.3 inches per month. May is typically the wettest month, when rainfall can reach 5.3 in. September is typically the driest time to visit Louisville when rainfall is around 3.1 in.

Temperature in Louisville by month

Plan your trip to Louisville by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Louisville, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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 January 20, 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines and United Airlines from Ontario to Louisville. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Boarding

8.2

Food

7.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Boarding

8.2

Food

7.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,696 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Boarding

8.2

Food

7.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Boarding

8.2

Food

7.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
8,982 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Boarding

8.2

Food

7.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Boarding

8.2

Food

7.2

Entertainment

7.7

Overall

8.1

Crew

8.7

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

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

    Flying on Delta is currently your cheapest option to Louisville, with prices starting at $347. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southwest, with the lowest prices starting at $357 and $402, respectively. Delta is currently priced 29% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Ontario to Louisville one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $209. Delta flights start at $214 while deals on United Airlines start at $224 one-way.

  • 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 Ontario?

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

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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 January 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$326Average$651FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$326Average$502FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$354Average$493FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$367Average$486FlexibilityNo cancel feeOn-time63%
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