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

American Airlines, Delta, and United Airlines 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 38% 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 August 2025.

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.

$145 Cheap Flights from Louisville to Ontario in 2025

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Find the cheapest flights from Louisville to Los Angeles

Round-trip

One-way

Last minute

Cheap round-trip flights

2:57 pm - 10:05 pmSDF-ONT

10h 08m1 stop

10:47 pm - 2:02 pmONT-SDF

12h 15m1 stop

$246

Find Deal

Fri, Oct 24 - Sun, Oct 26

4:20 pm - 7:17 amSDF-ONT

17h 57m1 stop

8:00 am - 3:20 pmONT-SDF

28h 20m1 stop

$249

Find Deal

Sun, Sep 14 - Wed, Oct 1

2:57 pm - 7:47 amSDF-ONT

19h 50m1 stop

8:00 am - 4:12 pmONT-SDF

29h 12m1 stop

$252

Find Deal

Sun, Oct 26 - Wed, Nov 5

4:20 pm - 7:17 amSDF-ONT

17h 57m1 stop

7:30 pm - 3:20 pmONT-SDF

16h 50m1 stop

$253

Find Deal

Sun, Sep 14 - Thu, Oct 2

8:23 am - 9:56 pmSDF-ONT

40h 33m2 stops

10:28 pm - 3:20 pmONT-SDF

13h 52m1 stop

$255

Find Deal

Tue, Sep 16 - Sun, Sep 28

5:31 pm - 7:49 amSDF-ONT

17h 18m2 stops

8:00 am - 2:02 pmONT-SDF

27h 02m1 stop

$258

Find Deal

Wed, Oct 22 - Wed, Oct 29

2:57 pm - 7:47 amSDF-ONT

19h 50m1 stop

8:34 am - 6:03 pmONT-SDF

30h 29m2 stops

$259

Find Deal

Sun, Oct 19 - Sat, Oct 25

5:31 pm - 6:42 amSDF-ONT

16h 11m2 stops

7:44 pm - 2:02 pmONT-SDF

15h 18m1 stop

$261

Find Deal

Wed, Oct 29 - Thu, Oct 30

6:00 am - 10:35 amSDF-ONT

7h 35m1 stop

10:00 pm - 10:00 amONT-SDF

9h 00m1 stop

$297Delta

Find Deal

Wed, Sep 10 - Wed, Sep 24

7:10 am - 10:35 amSDF-ONT

6h 25m1 stop

10:00 pm - 9:46 amONT-SDF

8h 46m2 stops

$302Delta

Find Deal

Wed, Sep 10 - Wed, Sep 24

Delta flights from Louisville to Ontario

Our best Delta deals on Louisville to Ontario flight tickets

Delta

Sep 10

SDF6:00 amLouisville Intl

7h 35m

1 stop

ONT10:35 amOntario

Sep 24

ONT10:00 pmOntario

9h 00m

1 stop

SDF10:00 amLouisville Intl

$297

Find similar

Delta

Sep 10

SDF7:10 amLouisville Intl

6h 25m

1 stop

ONT10:35 amOntario

Sep 24

ONT10:00 pmOntario

8h 46m

2 stops

SDF9:46 amLouisville Intl

$302

Find similar

Delta

Oct 8

SDF12:39 pmLouisville Intl

13h 02m

2 stops

ONT10:41 pmOntario

Oct 22

ONT9:50 amOntario

11h 09m

2 stops

SDF11:59 pmLouisville Intl

$307

Find similar

United Airlines flights from Louisville to Ontario

Our best United Airlines deals on Louisville to Ontario flight tickets

United Airlines

Aug 30

SDF3:30 pmLouisville Intl

8h 13m

1 stop

ONT8:43 pmOntario

Aug 31

ONT5:10 amOntario

9h 06m

2 stops

SDF5:16 pmLouisville Intl

$442

Find similar

United Airlines

Sep 1

SDF9:31 amLouisville Intl

6h 01m

1 stop

ONT12:32 pmOntario

Oct 7

ONT1:15 pmOntario

6h 15m

1 stop

SDF10:30 pmLouisville Intl

$597

Find similar

United Airlines

Sep 2

SDF3:30 pmLouisville Intl

8h 13m

1 stop

ONT8:43 pmOntario

Sep 6

ONT5:10 amOntario

6h 18m

1 stop

SDF2:28 pmLouisville Intl

$602

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Fri 10/24

2:57 pm-10:05 pm

1 stop10h 08m

Ontario

Sun 10/26

10:47 pm-2:02 pm

1 stop12h 15m

$246

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Sun 9/14

4:20 pm-7:17 am

1 stop17h 57m

Ontario

Wed 10/1

8:00 am-3:20 pm

1 stop28h 20m

$249

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Sun 10/26

2:57 pm-7:47 am

1 stop19h 50m

Ontario

Wed 11/5

8:00 am-4:12 pm

1 stop29h 12m

$252

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Sun 9/14

4:20 pm-7:17 am

1 stop17h 57m

Ontario

Thu 10/2

7:30 pm-3:20 pm

1 stop16h 50m

$253

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Tue 9/16

8:23 am-9:56 pm

2 stops40h 33m

Ontario

Sun 9/28

10:28 pm-3:20 pm

1 stop13h 52m

$255

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 10/22

5:31 pm-7:49 am

2 stops17h 18m

Ontario

Wed 10/29

8:00 am-2:02 pm

1 stop27h 02m

$258

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Sun 10/19

2:57 pm-7:47 am

1 stop19h 50m

Ontario

Sat 10/25

8:34 am-6:03 pm

2 stops30h 29m

$259

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 10/29

5:31 pm-6:42 am

2 stops16h 11m

Ontario

Thu 10/30

7:44 pm-2:02 pm

1 stop15h 18m

$261

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 9/10

6:00 am-10:35 am

1 stop7h 35m

Ontario

Wed 9/24

10:00 pm-10:00 am

1 stop9h 00m

$297

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 9/10

7:10 am-10:35 am

1 stop6h 25m

Ontario

Wed 9/24

10:00 pm-9:46 am

2 stops8h 46m

$302

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, April 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 $364. If you aren’t able to travel during the month of April, then book flights to Ontario from Louisville during October instead. Flights to Ontario in October, while not as cheap as those in April, still average around $400.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Thursday when prices can be found for as low as $461. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Louisville to Ontario for around $597.

What is the cheapest time of day to depart on your flight to Ontario?

In the evening is the cheapest time of day to fly from Louisville to Ontario when you can find flight prices for as low as $417. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $665 on average. Flights to Ontario from Louisville at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How have Louisville to Ontario flight prices changed over time?

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

Best Price Found	$145
Fastest flight time	6h 01m
Direct flights	None
Airports in Ontario	1 airport

The best one-way flight to Ontario from Louisville in the past 72 hours is $145. The best round-trip flight deal from Louisville to Ontario found on momondo in the last 72 hours is $246.

The fastest flight from Louisville to Ontario takes 6h 01m

There are no direct flights from Louisville to Ontario. Popular non-direct route for this connection is Louisville Intl Airport - Ontario Airport.

There is 1 airport near Ontario: Ontario (ONT)

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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 25m.
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 August 2025.
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 Southwest, representing 48% of all bookings. The subsequent popular airlines are American Airlines at 25%, Delta at 14%, and United Airlines 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
United Airlines	PriceFrom $257	Free Cancellation	Rating 7.4 8,922 reviews	Search United Airlines flights
American Airlines	PriceFrom $268	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $288	Free Cancellation	Rating 7.9 7,981 reviews	Search Delta flights
Southwest	PriceFrom $315	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest 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.