$77 Cheap Flights from Louisville (SDF) to St. Louis (STL)

View $77 flight on Wed, Feb 25, 2026Opens in a new window

Popular airlines from Louisville Intl. Airport (SDF) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Louisville to St. Louis (SDF-STL)

Prices were available within the past 7 days and start at $77 for one-way flights and $203 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Oct 28 - Thu, Oct 30
SDF
Louisville
STL
St. Louis
$203 Roundtrip, found 1 day ago
$203
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Louisville to St. Louis, returning Thu, Oct 30, priced at $203 found 1 day ago
Southwest Airlines
Tue, Oct 28 - Thu, Oct 30
SDF
Louisville
STL
St. Louis
$210 Roundtrip, found 1 day ago
$210
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Louisville to St. Louis, returning Thu, Oct 30, priced at $210 found 1 day ago
Southwest Airlines
Tue, Oct 28 - Thu, Oct 30
SDF
Louisville
STL
St. Louis
$215 Roundtrip, found 1 day ago
$215
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Louisville to St. Louis, returning Thu, Oct 30, priced at $215 found 1 day ago
American Airlines
Wed, Dec 17 - Thu, Dec 18
SDF
Louisville
STL
St. Louis
$239 Roundtrip, found 1 day ago
$239
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Dec 17 from Louisville to St. Louis, returning Thu, Dec 18, priced at $239 found 1 day ago
American Airlines
Thu, Oct 30 - Mon, Nov 3
SDF
Louisville
STL
St. Louis
$241 Roundtrip, found 6 days ago
$241
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Oct 30 from Louisville to St. Louis, returning Mon, Nov 3, priced at $241 found 6 days ago
Delta
Wed, Nov 5 - Tue, Nov 11
SDF
Louisville
STL
St. Louis
$243 Roundtrip, found 2 hours ago
$243
Roundtrip
found 2 hours ago
Select Delta flight, departing Wed, Nov 5 from Louisville to St. Louis, returning Tue, Nov 11, priced at $243 found 2 hours ago
Delta
Tue, Dec 16 - Wed, Dec 17
SDF
Louisville
STL
St. Louis
$245 Roundtrip, found 1 day ago
$245
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Dec 16 from Louisville to St. Louis, returning Wed, Dec 17, priced at $245 found 1 day ago
Southwest Airlines
Wed, Feb 25 - Sun, Mar 1
SDF
Louisville
STL
St. Louis
$250 Roundtrip, found 1 day ago
$250
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Wed, Feb 25 from Louisville to St. Louis, returning Sun, Mar 1, priced at $250 found 1 day ago
Southwest Airlines
Tue, Oct 28 - Thu, Oct 30
SDF
Louisville
STL
St. Louis
$251 Roundtrip, found 1 day ago
$251
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Louisville to St. Louis, returning Thu, Oct 30, priced at $251 found 1 day ago
United
Tue, Nov 4 - Mon, Nov 17
SDF
Louisville
STL
St. Louis
$261 Roundtrip, found 3 days ago
$261
Roundtrip
found 3 days ago
Select United flight, departing Tue, Nov 4 from Louisville to St. Louis, returning Mon, Nov 17, priced at $261 found 3 days ago

Find the cheapest month to fly from Louisville (SDF) to St. Louis (STL)

August is typically the cheapest month to fly

From $150 - $554 per traveler.

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $382
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $382

Frequently asked questions

How much does a flight from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL) cost?
Lock in a cheap one-way flight from $77 or cheap return flight from $203 from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL)?
Flying in October is a good way to save, as it's the cheapest month for flights between SDF and STL. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll fly you from SDF to STL. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL)?
There are no daily direct flights from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL). But you can opt for flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from SDF to STL?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can change based on a number of factors, such as the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL) route, aim to fly before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your ticket from SDF to STL just before your getaway is usually more expensive. But if there's some wiggle room with your schedule, you could snag a cheap last-minute fare.
Is it cheaper to book a SDF to STL flight and hotel package?
You'll typically save money by securing a SDF to STL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. Once you've selected your ideal accommodations and flights, consider adding extras including car rentals, tours and activities.
Can I cancel or change the date of my flight from Louisville Intl. Airport (SDF) to Lambert-St. Louis Intl. Airport (STL)?
In most instances, you can cancel or reschedule your SDF to STL flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like more details, visit our Customer Service portal.

Travel information

Travel information

Origin airport
Louisville Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$203
Distance
253 mi

Book with confidence

Book with confidence

Louisville to St. Louis Flights

The cheapest times to fly from Louisville to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Louisville to St. Louis are during the month of October. You can find some of the cheapest flights from Louisville to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Louisville to St. Louis

Sunday is one of the best days to book for cheap flights from Louisville to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Louisville to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Louisville to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $77 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Louisville to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Louisville to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Louisville to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.