What is the cheapest airline that flies from Louisville Intl to Ontario?

American Airlines and Delta are the most popular carriers operating from Louisville Intl to Ontario

What airlines fly to Ontario?

Delta, American Airlines and Frontier are the top three most popular airlines that fly to Ontario from Louisville according to our data. Delta is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 7 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Louisville Intl Airport to Ontario Airport?

Prices for flights from Louisville Intl Airport to Ontario Airport refresh daily.

How many operators does momondo search for flights from Louisville Intl Airport to Ontario Airport?

There are 4 operators available for flights from Louisville Intl Airport to Ontario Airport as of January 2026.

How old do you have to be to fly from Louisville Intl Airport to Ontario Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Louisville Intl Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$144 Cheap Flights from Louisville to Ontario in 2026

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Find the cheapest flights from Louisville to Los Angeles

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

5:10 pm - 9:05 pm

SDF

ONT

6h 55m

1 stop

6:25 am - 2:55 pm

ONT

SDF

5h 30m

1 stop

$321Southwest

Tue, Mar 3 - Tue, Mar 10

6:45 am - 4:05 pm

SDF

ONT

12h 20m

2 stops

11:55 pm - 10:30 am

ONT

SDF

7h 35m

1 stop

$326Southwest

Tue, Mar 3 - Tue, Mar 10

6:45 am - 4:05 pm

SDF

ONT

12h 20m

2 stops

7:05 am - 8:30 pm

ONT

SDF

10h 25m

2 stops

$332Southwest

Tue, Mar 3 - Tue, Mar 10

3:33 pm - 9:05 pm

SDF

ONT

8h 32m

1 stop

10:20 pm - 9:28 am

ONT

SDF

8h 08m

1 stop

$340Delta

Tue, Feb 24 - Sat, Feb 28

3:33 pm - 11:49 pm

SDF

ONT

11h 16m

2 stops

10:20 pm - 9:28 am

ONT

SDF

8h 08m

1 stop

$345Delta

Mon, Feb 23 - Wed, Feb 25

5:33 am - 12:02 pm

SDF

ONT

9h 29m

1 stop

10:20 pm - 9:28 am

ONT

SDF

8h 08m

1 stop

$359Delta

Tue, Feb 24 - Thu, Feb 26

5:33 am - 12:02 pm

SDF

ONT

9h 29m

1 stop

10:20 pm - 9:28 am

ONT

SDF

8h 08m

1 stop

$398Delta

Tue, Feb 24 - Fri, Feb 27

3:30 pm - 9:59 pm

SDF

ONT

9h 29m

1 stop

1:45 pm - 10:37 pm

ONT

SDF

5h 52m

1 stop

$430United Airlines

Thu, Feb 19 - Tue, Feb 24

3:15 pm - 8:50 pm

SDF

ONT

8h 35m

1 stop

5:10 am - 2:31 pm

ONT

SDF

6h 21m

1 stop

$431United Airlines

Wed, Mar 25 - Wed, Apr 1

6:25 am - 10:40 am

SDF

ONT

7h 15m

1 stop

3:40 pm - 12:30 am

ONT

SDF

5h 50m

1 stop

$437Southwest

Sun, Feb 15 - Fri, Feb 20

Delta flights from Louisville to Ontario

Our best Delta deals on Louisville to Ontario flight tickets

Delta

Feb 24

SDF3:33 pmLouisville Intl

8h 32m

1 stop

ONT9:05 pmOntario

Feb 28

ONT10:20 pmOntario

8h 08m

1 stop

SDF9:28 amLouisville Intl

$340

Delta

Feb 23

SDF3:33 pmLouisville Intl

11h 16m

2 stops

ONT11:49 pmOntario

Feb 25

ONT10:20 pmOntario

8h 08m

1 stop

SDF9:28 amLouisville Intl

$345

Delta

Feb 24

SDF5:33 amLouisville Intl

9h 29m

1 stop

ONT12:02 pmOntario

Feb 26

ONT10:20 pmOntario

8h 08m

1 stop

SDF9:28 amLouisville Intl

$359

American Airlines flights from Louisville to Ontario

Our best American Airlines deals on Louisville to Ontario flight tickets

American Airlines

Apr 8

SDF7:37 amLouisville Intl

8h 41m

1 stop

ONT1:18 pmOntario

Apr 12

ONT7:35 pmOntario

10h 03m

2 stops

SDF8:38 amLouisville Intl

$453

American Airlines

Apr 8

SDF8:30 amLouisville Intl

10h 52m

2 stops

ONT4:22 pmOntario

Apr 12

ONT7:35 pmOntario

10h 03m

2 stops

SDF8:38 amLouisville Intl

$462

American Airlines

Feb 26

SDF6:00 amLouisville Intl

7h 06m

1 stop

ONT10:06 amOntario

Mar 1

ONT11:58 pmOntario

7h 06m

1 stop

SDF10:04 amLouisville Intl

$488

Fly from

Fly to

Route

Depart

Return

Price

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Tue 3/3

5:10 pm-9:05 pm

1 stop6h 55m

Ontario

Tue 3/10

6:25 am-2:55 pm

1 stop5h 30m

$321

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Tue 3/3

6:45 am-4:05 pm

2 stops12h 20m

Ontario

Tue 3/10

11:55 pm-10:30 am

1 stop7h 35m

$326

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Tue 3/3

6:45 am-4:05 pm

2 stops12h 20m

Ontario

Tue 3/10

7:05 am-8:30 pm

2 stops10h 25m

$332

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Tue 2/24

3:33 pm-9:05 pm

1 stop8h 32m

Ontario

Sat 2/28

10:20 pm-9:28 am

1 stop8h 08m

$340

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Mon 2/23

3:33 pm-11:49 pm

2 stops11h 16m

Ontario

Wed 2/25

10:20 pm-9:28 am

1 stop8h 08m

$345

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Tue 2/24

5:33 am-12:02 pm

1 stop9h 29m

Ontario

Thu 2/26

10:20 pm-9:28 am

1 stop8h 08m

$359

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Tue 2/24

5:33 am-12:02 pm

1 stop9h 29m

Ontario

Fri 2/27

10:20 pm-9:28 am

1 stop8h 08m

$398

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Thu 2/19

3:30 pm-9:59 pm

1 stop9h 29m

Ontario

Tue 2/24

1:45 pm-10:37 pm

1 stop5h 52m

$430

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 3/25

3:15 pm-8:50 pm

1 stop8h 35m

Ontario

Wed 4/1

5:10 am-2:31 pm

1 stop6h 21m

$431

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Sun 2/15

6:25 am-10:40 am

1 stop7h 15m

Ontario

Fri 2/20

3:40 pm-12:30 am

1 stop5h 50m

$437

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Louisville to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Ontario?

In general, October is the cheapest month to fly from Louisville to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $324. If you aren’t able to travel during the month of October, then book flights to Ontario from Louisville during September instead. Flights to Ontario in September, while not as cheap as those in October, still average around $343.

How have Louisville to Ontario flight prices changed over time?

As of January 2026, prices for Louisville to Ontario flights are approximately 67% more expensive when compared to flights at the same time last year.

When to book flights from Louisville to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Louisville to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Louisville to Ontario (SDF to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Louisville to Ontario

Fastest flight time	6h 37m
Direct flights	None

The fastest flight from Louisville to Ontario takes 6h 37m

There are no direct flights from Louisville to Ontario. There are no popular flight routes from Louisville to Ontario.

Search flight deals

How far is Louisville Intl to Ontario by plane?
Ontario is 1792.4 mi away from Louisville Intl. In terms of flight time, this usually takes a little over 6h 37m.
When did momondo last update prices for flights from Louisville Intl Airport to Ontario Airport?
Prices for flights from Louisville Intl Airport to Ontario Airport refresh daily.
How many operators does momondo search for flights from Louisville Intl Airport to Ontario Airport?
There are 4 operators available for flights from Louisville Intl Airport to Ontario Airport as of January 2026.
How old do you have to be to fly from Louisville Intl Airport to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Louisville Intl Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Louisville to Ontario?
momondo data reveals that the most frequently booked airline on the route from Louisville to Ontario is American Airlines, representing 36% of all bookings. The subsequent popular airlines are Southwest at 34%, United Airlines at 16%, and Delta at 14%.

Best airlines flying from Louisville to Ontario

Compare and see reviews for airlines that fly from Louisville to Ontario with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $268	Free Cancellation	Rating 7.2 11,137 reviews	Search American Airlines flights
Delta	PriceFrom $288	Free Cancellation	Rating 7.9 8,051 reviews	Search Delta flights
Southwest	PriceFrom $302	Free Cancellation	Rating 8.0 4,260 reviews	Search Southwest flights
United Airlines	PriceFrom $344	Free Cancellation	Rating 7.4 9,163 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Louisville to Ontario?

It is quick and easy to find Louisville to Ontario flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ontario that suits you.

Can I find flights from Louisville to Ontario with flexible booking policies on momondo?

Yes. All flights to Ontario from Louisville on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Louisville to Ontario?

Once all potential Louisville to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Louisville to Ontario right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Louisville to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.