$105 Cheap Flights from Louisville (SDF) to St. Louis (STL)

View $105 flight on Sat, Dec 6, 2025Opens in a new window

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

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

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

Prices were available within the past 7 days and start at $105 for one-way flights and $209 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Dec 16 - Wed, Dec 24
SDF
Louisville
STL
St. Louis
$209 Roundtrip, found 4 hours ago
$209
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Dec 16 from Louisville to St. Louis, returning Wed, Dec 24, priced at $209 found 4 hours ago
Delta
Tue, Dec 16 - Thu, Dec 25
SDF
Louisville
STL
St. Louis
$223 Roundtrip, found 4 hours ago
$223
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Dec 16 from Louisville to St. Louis, returning Thu, Dec 25, priced at $223 found 4 hours ago
Delta
Mon, Nov 24 - Wed, Dec 3
SDF
Louisville
STL
St. Louis
$231 Roundtrip, found 2 days ago
$231
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Nov 24 from Louisville to St. Louis, returning Wed, Dec 3, priced at $231 found 2 days ago
Delta
Tue, Nov 11 - Wed, Dec 3
SDF
Louisville
STL
St. Louis
$233 Roundtrip, found 2 days ago
$233
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Nov 11 from Louisville to St. Louis, returning Wed, Dec 3, priced at $233 found 2 days ago
Delta
Thu, Dec 18 - Thu, Dec 25
SDF
Louisville
STL
St. Louis
$237 Roundtrip, found 4 hours ago
$237
Roundtrip
found 4 hours ago
Select Delta flight, departing Thu, Dec 18 from Louisville to St. Louis, returning Thu, Dec 25, priced at $237 found 4 hours ago
Delta
Sun, Dec 21 - Wed, Dec 24
SDF
Louisville
STL
St. Louis
$249 Roundtrip, found 4 hours ago
$249
Roundtrip
found 4 hours ago
Select Delta flight, departing Sun, Dec 21 from Louisville to St. Louis, returning Wed, Dec 24, priced at $249 found 4 hours ago
Delta
Mon, Nov 24 - Thu, Nov 27
SDF
Louisville
STL
St. Louis
$253 Roundtrip, found 2 days ago
$253
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Nov 24 from Louisville to St. Louis, returning Thu, Nov 27, priced at $253 found 2 days ago
American Airlines
Tue, Dec 16 - Tue, Dec 23
SDF
Louisville
STL
St. Louis
$269 Roundtrip, found 4 hours ago
$269
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Tue, Dec 16 from Louisville to St. Louis, returning Tue, Dec 23, priced at $269 found 4 hours ago
United
Wed, Nov 26 - Thu, Nov 27
SDF
Louisville
STL
St. Louis
$284 Roundtrip, found 3 days ago
$284
Roundtrip
found 3 days ago
Select United flight, departing Wed, Nov 26 from Louisville to St. Louis, returning Thu, Nov 27, priced at $284 found 3 days ago
Southwest Airlines
Mon, Dec 8 - Tue, Dec 9
SDF
Louisville
STL
St. Louis
$293 Roundtrip, found 6 days ago
$293
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Mon, Dec 8 from Louisville to St. Louis, returning Tue, Dec 9, priced at $293 found 6 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 $479
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $479

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 $105 or cheap return flight from $209 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 December 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

Origin airport
Louisville Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$208
Distance
253 mi

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 December. 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 $105 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

*Available to One Key members.