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.

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

Southwest, United Airlines, and American Airlines are the most popular carriers operating from Louisville Intl to Ontario

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 November 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.

$180 Cheap Flights from Louisville to Ontario in 2025/26

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Cheap round-trip flights

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7:05 am - 11:31 amSDF-ONT

7h 26m1 stop

10:30 pm - 9:26 amONT-SDF

7h 56m1 stop

$293Delta

Find Deal

Wed, Jan 14 - Tue, Jan 27

6:00 am - 11:31 amSDF-ONT

8h 31m1 stop

7:30 am - 11:06 pmONT-SDF

12h 36m2 stops

$298Delta

Find Deal

Wed, Jan 14 - Tue, Jan 27

4:56 pm - 10:38 pmSDF-ONT

8h 42m2 stops

7:30 am - 11:06 pmONT-SDF

12h 36m2 stops

$303Delta

Find Deal

Wed, Jan 14 - Tue, Jan 27

7:00 am - 11:31 amSDF-ONT

7h 31m1 stop

12:41 pm - 11:50 pmONT-SDF

8h 09m1 stop

$307Delta

Find Deal

Sun, Jan 18 - Sat, Jan 24

8:00 am - 4:07 pmSDF-ONT

11h 07m2 stops

6:00 am - 5:33 pmONT-SDF

8h 33m1 stop

$381American Airlines

Find Deal

Wed, Dec 31 - Wed, Jan 7

6:32 pm - 10:48 pmSDF-ONT

7h 16m1 stop

6:00 am - 5:33 pmONT-SDF

8h 33m1 stop

$383American Airlines

Find Deal

Mon, Jan 26 - Thu, Jan 29

8:00 am - 4:07 pmSDF-ONT

11h 07m2 stops

9:59 am - 10:12 pmONT-SDF

9h 13m2 stops

$386American Airlines

Find Deal

Wed, Dec 31 - Wed, Jan 7

6:32 pm - 10:48 pmSDF-ONT

7h 16m1 stop

9:59 am - 11:19 pmONT-SDF

10h 20m2 stops

$388American Airlines

Find Deal

Mon, Jan 26 - Thu, Jan 29

8:07 am - 4:05 pmSDF-ONT

10h 58m2 stops

9:59 am - 11:19 pmONT-SDF

10h 20m2 stops

$393American Airlines

Find Deal

Mon, Jan 26 - Thu, Jan 29

6:05 am - 9:40 amSDF-ONT

6h 35m1 stop

12:45 pm - 11:45 pmONT-SDF

8h 00m1 stop

$398Southwest

Find Deal

Thu, Dec 25 - Thu, Jan 1

Delta flights from Louisville to Ontario

Our best Delta deals on Louisville to Ontario flight tickets

Delta

Jan 14

SDF7:05 amLouisville Intl

7h 26m

1 stop

ONT11:31 amOntario

Jan 27

ONT10:30 pmOntario

7h 56m

1 stop

SDF9:26 amLouisville Intl

$293

Find similar

Delta

Jan 14

SDF6:00 amLouisville Intl

8h 31m

1 stop

ONT11:31 amOntario

Jan 27

ONT7:30 amOntario

12h 36m

2 stops

SDF11:06 pmLouisville Intl

$298

Find similar

Delta

Jan 14

SDF4:56 pmLouisville Intl

8h 42m

2 stops

ONT10:38 pmOntario

Jan 27

ONT7:30 amOntario

12h 36m

2 stops

SDF11:06 pmLouisville Intl

$303

Find similar

United Airlines flights from Louisville to Ontario

Our best United Airlines deals on Louisville to Ontario flight tickets

United Airlines

Jan 7

SDF5:35 amLouisville Intl

10h 12m

2 stops

ONT12:47 pmOntario

Jan 11

ONT1:24 pmOntario

6h 00m

1 stop

SDF10:24 pmLouisville Intl

$460

Find similar

United Airlines

Dec 12

SDF9:15 amLouisville Intl

6h 17m

1 stop

ONT12:32 pmOntario

Dec 15

ONT6:00 amOntario

12h 57m

2 stops

SDF9:57 pmLouisville Intl

$463

Find similar

United Airlines

Dec 12

SDF1:50 pmLouisville Intl

10h 59m

2 stops

ONT9:49 pmOntario

Dec 15

ONT6:00 amOntario

11h 42m

2 stops

SDF8:42 pmLouisville Intl

$468

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 1/14

7:05 am-11:31 am

1 stop7h 26m

Ontario

Tue 1/27

10:30 pm-9:26 am

1 stop7h 56m

$293

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 1/14

6:00 am-11:31 am

1 stop8h 31m

Ontario

Tue 1/27

7:30 am-11:06 pm

2 stops12h 36m

$298

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 1/14

4:56 pm-10:38 pm

2 stops8h 42m

Ontario

Tue 1/27

7:30 am-11:06 pm

2 stops12h 36m

$303

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Sun 1/18

7:00 am-11:31 am

1 stop7h 31m

Ontario

Sat 1/24

12:41 pm-11:50 pm

1 stop8h 09m

$307

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 12/31

8:00 am-4:07 pm

2 stops11h 07m

Ontario

Wed 1/7

6:00 am-5:33 pm

1 stop8h 33m

$381

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Mon 1/26

6:32 pm-10:48 pm

1 stop7h 16m

Ontario

Thu 1/29

6:00 am-5:33 pm

1 stop8h 33m

$383

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Wed 12/31

8:00 am-4:07 pm

2 stops11h 07m

Ontario

Wed 1/7

9:59 am-10:12 pm

2 stops9h 13m

$386

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Mon 1/26

6:32 pm-10:48 pm

1 stop7h 16m

Ontario

Thu 1/29

9:59 am-11:19 pm

2 stops10h 20m

$388

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Mon 1/26

8:07 am-4:05 pm

2 stops10h 58m

Ontario

Thu 1/29

9:59 am-11:19 pm

2 stops10h 20m

$393

LouisvilleOntario

SDF - ONT

SDFONT

Louisville Intl

Thu 12/25

6:05 am-9:40 am

1 stop6h 35m

Ontario

Thu 1/1

12:45 pm-11:45 pm

1 stop8h 00m

$398

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 $332. 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.

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

Fastest flight time	6h 20m
Direct flights	None

The fastest flight from Louisville to Ontario takes 6h 20m

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

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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 17m.
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 November 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 38% of all bookings. The subsequent popular airlines are American Airlines at 32%, 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 11,038 reviews	Search American Airlines flights
Delta	PriceFrom $288	Free Cancellation	Rating 7.9 7,999 reviews	Search Delta flights
Southwest	PriceFrom $302	Free Cancellation	Rating 8.0 4,254 reviews	Search Southwest flights
United Airlines	PriceFrom $344	Free Cancellation	Rating 7.4 9,046 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.