$174 Cheap Delta flights Louisville (SDF) to Ontario (ONT)

View $174 flight on Tue, Dec 2, 2025Opens in a new window

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$174 Cheap Delta flights Louisville (SDF) to Ontario (ONT)

Prices were available within the past 7 days and start at $174 for one-way flights and $277 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Dec 2 - Tue, Dec 9
SDF
Louisville
ONT
Ontario
$277 Roundtrip, found 5 days ago
$277
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Dec 2 from Louisville to Ontario, returning Tue, Dec 9, priced at $277 found 5 days ago
Delta
Wed, Oct 1 - Tue, Oct 7
SDF
Louisville
ONT
Ontario
$301 Roundtrip, found 2 hours ago
$301
Roundtrip
found 2 hours ago
Select Delta flight, departing Wed, Oct 1 from Louisville to Ontario, returning Tue, Oct 7, priced at $301 found 2 hours ago
Delta
Fri, Dec 5 - Tue, Dec 9
SDF
Louisville
ONT
Ontario
$309 Roundtrip, found 5 days ago
$309
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Dec 5 from Louisville to Ontario, returning Tue, Dec 9, priced at $309 found 5 days ago
Delta
Tue, Sep 9 - Sat, Sep 13
SDF
Louisville
ONT
Ontario
$313 Roundtrip, just found
$313
Roundtrip
just found
Select Delta flight, departing Tue, Sep 9 from Louisville to Ontario, returning Sat, Sep 13, priced at $313 just found
Delta
Wed, Oct 1 - Tue, Oct 7
SDF
Louisville
ONT
Ontario
$322 Roundtrip, found 2 hours ago
$322
Roundtrip
found 2 hours ago
Select Delta flight, departing Wed, Oct 1 from Louisville to Ontario, returning Tue, Oct 7, priced at $322 found 2 hours ago
Delta
Mon, Nov 17 - Mon, Nov 24
SDF
Louisville
ONT
Ontario
$322 Roundtrip, found 5 days ago
$322
Roundtrip
found 5 days ago
Select Delta flight, departing Mon, Nov 17 from Louisville to Ontario, returning Mon, Nov 24, priced at $322 found 5 days ago
Delta
Sat, Jan 17 - Tue, Jan 20
SDF
Louisville
ONT
Ontario
$324 Roundtrip, found 6 hours ago
$324
Roundtrip
found 6 hours ago
Select Delta flight, departing Sat, Jan 17 from Louisville to Ontario, returning Tue, Jan 20, priced at $324 found 6 hours ago
Delta
Thu, Sep 11 - Sat, Sep 13
SDF
Louisville
ONT
Ontario
$329 Roundtrip, just found
$329
Roundtrip
just found
Select Delta flight, departing Thu, Sep 11 from Louisville to Ontario, returning Sat, Sep 13, priced at $329 just found
Delta
Sat, Aug 30 - Sun, Aug 31
SDF
Louisville
ONT
Ontario
$347 Roundtrip, found 2 hours ago
$347
Roundtrip
found 2 hours ago
Select Delta flight, departing Sat, Aug 30 from Louisville to Ontario, returning Sun, Aug 31, priced at $347 found 2 hours ago
Delta
Wed, Oct 1 - Tue, Oct 7
SDF
Louisville
ONT
Ontario
$347 Roundtrip, found 2 hours ago
$347
Roundtrip
found 2 hours ago
Select Delta flight, departing Wed, Oct 1 from Louisville to Ontario, returning Tue, Oct 7, priced at $347 found 2 hours ago
Flights from Louisville (SDF) to Ontario (ONT)
Origin airport
Louisville Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Southwest Airlines, United
Popular airline
American Airlines
Distance
1791 mi

Frequently asked questions

How much is a Delta Air Lines flight from Louisville Intl. Airport (SDF) to Los Angeles - Ontario Intl. Airport (ONT)?
Make use of the "Price (lowest to highest)" filter on Expedia to search for cheap Delta Air Lines round-trip flights from $277 from SDF to ONT. Affordable one-way fares from $174 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from SDF to ONT with Delta Air Lines?
Browse for round-trip or one-way flights to Ontario in January or April. You could find a cheap fare with Delta Air Lines during these off-peak times.
What is the cheapest time to book flights from Louisville Intl. Airport (SDF) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
Start searching one to three months ahead of your departure date to get cheaper fares on Delta Air Lines flights from Louisville Intl. Airport (SDF) to Los Angeles - Ontario Intl. Airport (ONT). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Louisville Intl. Airport (SDF) to Los Angeles - Ontario Intl. Airport (ONT)?
To find out if there's a direct trip from SDF to ONT with Delta Air Lines or another airline, use our "Nonstop" filter when browsing for tickets.
What is the earliest Delta Air Lines flight from SDF to ONT?
Sort your results by "Morning" and "Early Morning" to see the earliest flights from SDF to ONT. Jetting off early means flight cancellations are less likely.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Ontario?
Jump on a Delta Air Lines flight from Louisville Intl. Airport (SDF) to Ontario, and you'll likely touch down at Los Angeles - Ontario Intl. Airport (ONT). This is the airline's main hub in this destination.
Why fly with Delta Air Lines from SDF to ONT?
Offering a rewarding loyalty program and an excellent in-flight experience, Delta Air Lines is a favorite for many travelers heading from SDF to ONT. Plus, if you're a Delta SkyMiles and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which you can put toward future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Louisville Intl. Airport (SDF) to Los Angeles - Ontario Intl. Airport (ONT)?
Changes are usually free within 24 hours of booking, but your airline may charge you after that. For further details about altering your reservation, head to your "Trips," select your flight and click on "Manage Booking." If you'd like the freedom to change your plans without additional charges, tick the "Changes included" and "No cancel fee" filters when planning your next break.

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