$169 Cheap United flights from Louisville to Ontario (SDF to ONT)

Find The Best Day To Fly from Louisville to Ontario

Amazing United SDF to ONT Flight Deals

The cheapest flights to Los Angeles - Ontario Intl. found within the past 7 days were $335 round trip and $169 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Oct 7 - Wed, Oct 8
SDF
Louisville
ONT
Ontario
$335 Roundtrip, found 1 day ago
$335
Roundtrip
found 1 day ago
Select United flight, departing Tue, Oct 7 from Louisville to Ontario, returning Wed, Oct 8, priced at $335 found 1 day ago
Tue, Oct 7 - Thu, Oct 23
SDF
Louisville
ONT
Ontario
$375 Roundtrip, found 1 day ago
$375
Roundtrip
found 1 day ago
Select United flight, departing Tue, Oct 7 from Louisville to Ontario, returning Thu, Oct 23, priced at $375 found 1 day ago
Thu, Jul 31 - Sun, Aug 3
SDF
Louisville
ONT
Ontario
$517 Roundtrip, found 12 hours ago
$517
Roundtrip
found 12 hours ago
Select United flight, departing Thu, Jul 31 from Louisville to Ontario, returning Sun, Aug 3, priced at $517 found 12 hours ago
Thu, Jul 31 - Sun, Aug 3
SDF
Louisville
ONT
Ontario
$567 Roundtrip, found 12 hours ago
$567
Roundtrip
found 12 hours ago
Select United flight, departing Thu, Jul 31 from Louisville to Ontario, returning Sun, Aug 3, priced at $567 found 12 hours ago
Thu, Jul 31 - Sun, Aug 3
SDF
Louisville
ONT
Ontario
$572 Roundtrip, found 12 hours ago
$572
Roundtrip
found 12 hours ago
Select United flight, departing Thu, Jul 31 from Louisville to Ontario, returning Sun, Aug 3, priced at $572 found 12 hours ago
Thu, Jul 31 - Sun, Aug 3
SDF
Louisville
ONT
Ontario
$575 Roundtrip, found 12 hours ago
$575
Roundtrip
found 12 hours ago
Select United flight, departing Thu, Jul 31 from Louisville to Ontario, returning Sun, Aug 3, priced at $575 found 12 hours ago

Frequently asked questions

Can I catch a flight from Louisville Muhammad Ali Intl. Airport to Los Angeles - Ontario Intl. Airport (ONT) right now?
For information on any current ONT travel advice and quarantine requirements, visit the Covid-19 Travel Advisor. Look before you arrange your flight, so you don't get caught up en route.
What terminal is United Airlines at SDF?
The information printed on tickets often differs from airline to airline. If you're flying from SDF to Ontario Airport with United Airlines and you can't locate your terminal details, contact the airline.
Are there United Airlines non-stop flights from SDF to ONT?
Expect to make at least one stopover when flying from Louisville Intl. Airport (SDF) to ONT, as United Airlines doesn't operate nonstop flights between these two locations. While in transit, you might like to pick up a newspaper or a glossy magazine from the airport bookstore to make the time go faster.
How long is a United Airlines flight from SDF to ONT?
Pack that novel in your carry-on you've been desperate to read. A flight from Louisville Muhammad Ali Intl. Airport to ONT with United Airlines takes an average of 5 hours and 35 minutes. You'll have more than enough time to get lost in the enthralling plot.
How many direct and indirect flights does United Airlines fly from SDF to ONT?
You'll have loads of flexibility if you fly with United Airlines between SDF and ONT. It offers no fewer than 2 flights every day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Ontario Airport, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Travelers ❤️ these 🏨 after their flight to Ontario

Ontario Airport Hotel & Conference Center

Ontario Airport Hotel & Conference Center

3.5 out of 5
700 N Haven Ave, Ontario, CA
This hotel features an outdoor pool, a 24-hour gym, and a restaurant. Traveling on business? Take advantage of the 24-hour business center and free WiFi in public ...
8.6/10 Excellent! (2,866 reviews)
"Very good"

Reviewed on Jul 16, 2025

Ontario Airport Hotel & Conference Center
La Quinta Inn & Suites by Wyndham Ontario Airport

La Quinta Inn & Suites by Wyndham Ontario Airport

3 out of 5
3555 Inland Empire Blvd, Ontario, CA
This hotel features an outdoor pool and a gym. Traveling on business? Take advantage of the 24-hour business center, free WiFi in public areas, and free airport ...
8.2/10 Very Good! (1,902 reviews)
"The stuff was rude"

Reviewed on Jul 15, 2025

La Quinta Inn & Suites by Wyndham Ontario Airport
Ontario Airport Inn

Ontario Airport Inn

2.5 out of 5
1801 E G St, Ontario, CA
This hotel doesn't skimp on freebies - guests receive free buffet breakfast, free self parking, and a free airport shuttle. Traveling on business? Take advantage ...
8.6/10 Excellent! (1,567 reviews)
"I had a great time at this place. It was peaceful."

Reviewed on Jul 15, 2025

Ontario Airport Inn
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.