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 $307. Additional round-trip tickets that might be worth considering are offered by American Airlines and Southwest, with the lowest prices starting at $327 and $371, respectively. Delta is currently priced 36% 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 Delta, which is currently one of the cheapest options available, starting at $154. American Airlines flights start at $159 while deals on United Airlines start at $219 one-way.

What is the cheapest day to fly from Ontario to Louisville?

Travelers seeking maximum savings on their Ontario to Louisville flight should consider departing on Friday afternoons when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

What are the most popular airlines that fly from Ontario to Louisville?

American Airlines, Delta and United Airlines are the most popular airlines when flying from Ontario to Louisville.

What is the cheapest day to fly round-trip from Ontario to Louisville?

Leaving on a Friday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 6% on the overall cost on flights from Ontario to Louisville.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 56 days in advance, which can save you up to 211% on flights from Ontario to Louisville compared to booking the week you need them. Waiting 56 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $309. For sooner than that we have options available in the next 3 days from $449.

What is the cheapest month to fly from Ontario to Louisville?

August can be a great time to fly to Louisville from Ontario with a flight ticket averaging about $373. Cheapflights users have found deals in the month of August for as cheap as $88. The most expensive prices can be found in the month of December.

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 eDreams the most. eDreams 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.

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.

$154+ Flights from Ontario to Louisville

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$307 (Delta)
One-way from	$154 (Delta)
Popular in	May
Cheapest in	February
Average price	$416

Provider with most accurate pricing for Ontario-Louisville Intl flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-Louisville Intl flights.

Search Deals

From Ontario to Louisville Intl

Search Deals

One-way flight from Ontario to Louisville Intl

Search Deals

Highest demand for flights based on searches. 2% potential increase in price ($12 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 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 April 15, 2025.

Sat 5/2412:18 pmONT - SDF

1 stop8h 47mDelta

Sun 5/257:05 amSDF - ONT

1 stop7h 03mDelta

Deal found 4/13

$307

Mon 5/1211:59 pmONT - SDF

1 stop7h 26mAmerican Airlines

Wed 5/146:00 amSDF - ONT

1 stop6h 50mAmerican Airlines

Deal found 4/15

$325

Sat 5/1011:05 amONT - SDF

1 stop8h 00mSouthwest

Sat 5/177:50 amSDF - ONT

2 stops10h 45mSouthwest

Deal found 4/14

$332

Tue 6/176:32 pmONT - SDF

2 stops12h 44mUnited Airlines

Tue 6/243:29 pmSDF - ONT

1 stop8h 35mUnited Airlines

Deal found 4/13

$348

Wed 5/76:00 amONT - SDF

2 stops14h 01mAlaska Airlines

Wed 5/148:56 amSDF - ONT

2 stops14h 33mAlaska Airlines

Deal found 4/15

$491

Best flights from Ontario to Louisville
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 15, 2025.

Tue 5/2012:18 pmONT - SDF

1 stop7h 25mDelta

Sun 5/257:05 amSDF - ONT

1 stop7h 03mDelta

Deal found 4/15

$307

Tue 6/1010:54 amONT - SDF

1 stop8h 53mAmerican Airlines

Sat 6/146:12 pmSDF - ONT

1 stop8h 47mAmerican Airlines

Deal found 4/15

$327

Sat 6/76:00 amONT - SDF

1 stop8h 35mSouthwest

Thu 6/128:35 pmSDF - ONT

1 stop6h 20mSouthwest

Deal found 4/15

$371

Wed 5/75:05 amONT - SDF

1 stop6h 20mUnited Airlines

Wed 5/143:27 pmSDF - ONT

1 stop9h 33mUnited Airlines

Deal found 4/15

$397

Wed 5/76:00 amONT - SDF

2 stops14h 01mAlaska Airlines

Wed 5/148:56 amSDF - ONT

2 stops14h 33mAlaska Airlines

Deal found 4/15

$491

Last-minute flights from Ontario to Louisville
Discover last-minute flight deals from Ontario to Louisville. Data last updated April 15, 2025 and is based on user searches.

Wed 4/231:35 pmONT - SDF

1 stop5h 40mUnited Airlines

Sun 4/273:25 pmSDF - ONT

1 stop8h 17mUnited Airlines

Deal found 4/13

$652

Fri 4/255:10 amONT - SDF

1 stop8h 05mSouthwest

Tue 4/2911:45 amSDF - ONT

1 stop8h 30mSouthwest

Deal found 4/14

$682

Fri 4/2512:07 pmONT - SDF

1 stop6h 41mDelta

Mon 4/282:37 pmSDF - ONT

1 stop7h 51mDelta

Deal found 4/14

$732

Fri 4/256:00 amONT - SDF

2 stops14h 00mAlaska Airlines

Mon 4/286:00 amSDF - ONT

2 stops14h 30mAlaska Airlines

Deal found 4/14

$737

Mon 5/51:20 pmONT - SDF

1 stop5h 52mUnited Airlines

Sat 5/103:27 pmSDF - ONT

1 stop9h 33mUnited Airlines

Deal found 4/14

$415

Wed 5/76:00 amONT - SDF

2 stops14h 01mAlaska Airlines

Wed 5/148:56 amSDF - ONT

2 stops14h 33mAlaska Airlines

Deal found 4/15

$491

Sat 5/1011:05 amONT - SDF

1 stop8h 00mSouthwest

Sat 5/177:50 amSDF - ONT

2 stops10h 45mSouthwest

Deal found 4/14

$332

Mon 5/1211:59 pmONT - SDF

1 stop7h 26mAmerican Airlines

Wed 5/146:00 amSDF - ONT

1 stop6h 50mAmerican Airlines

Deal found 4/15

$325

Sat 5/2412:18 pmONT - SDF

1 stop8h 47mDelta

Tue 5/275:55 pmSDF - ONT

1 stop7h 34mDelta

Deal found 4/13

$307

One-way flights from Ontario to Louisville
Search for one-way flight options from Ontario to Louisville. Find affordable one-way fares based on user searches. Data last updated April 15, 2025.

Wed 6/412:18 pmONT - SDF

1 stop8h 47mDelta

Deal found 4/14

$154

Wed 6/410:00 amONT - SDF

2 stops8h 03mAmerican Airlines

Deal found 4/14

$159

Sat 5/315:10 amONT - SDF

1 stop6h 21mUnited Airlines

Deal found 4/15

$219

Thu 5/297:20 pmONT - SDF

2 stops12h 38mAlaska Airlines

Deal found 4/15

$222

Cheapflights Fare Finder

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

Price

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 5/24

12:18 pm-12:05 am

1 stop8h 47m

Louisville Intl

Tue 5/27

5:55 pm-10:29 pm

1 stop7h 34m

$307

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Mon 5/12

11:59 pm-10:25 am

1 stop7h 26m

Louisville Intl

Wed 5/14

6:00 am-9:50 am

1 stop6h 50m

$325

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 5/10

11:05 am-10:05 pm

1 stop8h 00m

Louisville Intl

Sat 5/17

7:50 am-3:35 pm

2 stops10h 45m

$332

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Tue 6/17

6:32 pm-10:16 am

2 stops12h 44m

Louisville Intl

Tue 6/24

3:29 pm-9:04 pm

1 stop8h 35m

$348

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Wed 5/7

6:00 am-11:01 pm

2 stops14h 01m

Louisville Intl

Wed 5/14

8:56 am-8:29 pm

2 stops14h 33m

$491

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Wed 6/4

12:18 pm-12:05 am

1 stop8h 47m

$154

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Wed 6/4

10:00 am-9:03 pm

2 stops8h 03m

$159

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Sat 5/31

5:10 am-2:31 pm

1 stop6h 21m

$219

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Thu 5/29

7:20 pm-10:58 am

2 stops12h 38m

$222

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

Compare providers for flights from Ontario to Louisville

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*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
eDreams	Price Accuracy3 stars	Trust 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 eDreams the most. eDreams 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.

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?

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

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

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

Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Ontario to Louisville. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,876 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines

8.0

Very good

9,876 reviews

Alaska Airlines

8.0

Very good

9,876 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Southwest

8.0

Very good

4,279 reviews

Alaska Airlines

8.0

Very good

9,876 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Delta

8.0

Very good

7,917 reviews

Alaska Airlines

8.0

Very good

9,876 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

United Airlines

7.4

Good

8,658 reviews

Alaska Airlines

8.0

Very good

9,876 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,876 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Related info for your journey

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 $307. Additional round-trip tickets that might be worth considering are offered by American Airlines and Southwest, with the lowest prices starting at $327 and $371, respectively. Delta is currently priced 36% 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 Delta, which is currently one of the cheapest options available, starting at $154. American Airlines flights start at $159 while deals on United Airlines start at $219 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

Jeffersonville

Corydon

Elizabethtown

Bardstown

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Ontario to Louisville

Los Angeles to Nashville flights

San Francisco to Nashville flights

Ontario to Nashville flights

Burbank to Nashville flights

San Diego to Nashville flights

Santa Ana to Nashville flights

Sacramento to Nashville flights

Las Vegas to Nashville flights

San Jose to Nashville flights

Oakland to Nashville flights

Los Angeles to Cincinnati flights

San Francisco to Cincinnati flights

Long Beach to Nashville flights

Ontario to Cincinnati flights

Los Angeles to Lexington flights

Fresno to Nashville flights

Santa Ana to Cincinnati flights

Los Angeles to Louisville flights

Los Angeles to Knoxville flights

San Francisco to Knoxville flights

San Diego to Knoxville flights

Ontario to Knoxville flights

Las Vegas to Cincinnati flights

Burbank to Cincinnati flights

San Francisco to Lexington flights

Burbank to Louisville flights

Palm Springs to Nashville flights

San Francisco to Louisville flights

San Diego to Louisville flights

San Diego to Cincinnati flights

Santa Ana to Louisville flights

Las Vegas to Lexington flights

Santa Ana to Lexington flights

San Diego to Lexington flights

Santa Ana to Knoxville flights

Ontario to Lexington flights

Reno to Nashville flights

Reno to Cincinnati flights

Sacramento to Knoxville flights

Sacramento to Cincinnati flights

Reno to Knoxville flights

San Jose to Knoxville flights

Santa Barbara to Nashville flights

San Jose to Cincinnati flights

Long Beach to Cincinnati flights

Santa Rosa to Nashville flights

Oakland to Cincinnati flights

Medford to Nashville flights

Fresno to Knoxville flights

Complete your trip

Louisville car rentals

Cincinnati Cinci./N. Kentucky Airport car rentals

Louisville Intl Airport car rentals

Lexington Blue Grass Airport car rentals

Evansville Dress Regional Airport car rentals

Cincinnati Airport car rentals

Owensboro Daviess County Airport car rentals

Lexington car rentals

Beechmont car rentals

Centrum car rentals

Other flights to Louisville

Top 4 airlines flying from Ontario to Louisville

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$326	Average$504	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$346	Average$416	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$354	Average$505	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$367	Average$476	FlexibilityNo cancel fee	On-time63%

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.

$154+ 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 6/4. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Louisville with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Ontario to Louisville

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Louisville

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 15, 2025.

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 15, 2025.

Cheapflights Fare Finder

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

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.

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.

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?

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 April 15, 2025.

Rainfall in Louisville by month

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

Temperature in Louisville by month

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

Reviews of airlines servicing Louisville

Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Ontario to Louisville. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

How can I find direct flights from Ontario to Louisville?

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

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

Traveling to a place near Ontario?

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.

Top 4 airlines flying from Ontario to Louisville

100% Free

Book with Flexibility

Travel Smart

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 April 15, 2025.