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$149 Cheap Flights from Louisville (SDF) to St. Louis (STL)

View $149 flight on Thu, Oct 1, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $149 for one-way flights and $297 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Oct 1 - Sat, Oct 3
SDF
Louisville
STL
St. Louis
$297 Roundtrip, found 2 days ago
$297
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Oct 1 from Louisville to St. Louis, returning Sat, Oct 3, priced at $297 found 2 days ago
Delta
Mon, Feb 22 - Tue, Feb 23
SDF
Louisville
STL
St. Louis
$297 Roundtrip, found 2 days ago
$297
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Feb 22 from Louisville to St. Louis, returning Tue, Feb 23, priced at $297 found 2 days ago
United
Thu, Oct 1 - Sat, Oct 3
SDF
Louisville
STL
St. Louis
$310 Roundtrip, found 2 days ago
$310
Roundtrip
found 2 days ago
Select United flight, departing Thu, Oct 1 from Louisville to St. Louis, returning Sat, Oct 3, priced at $310 found 2 days ago
United
Thu, Oct 1 - Sat, Oct 3
SDF
Louisville
STL
St. Louis
$317 Roundtrip, found 2 days ago
$317
Roundtrip
found 2 days ago
Select United flight, departing Thu, Oct 1 from Louisville to St. Louis, returning Sat, Oct 3, priced at $317 found 2 days ago
Southwest Airlines
Thu, Oct 1 - Sat, Oct 3
SDF
Louisville
STL
St. Louis
$319 Roundtrip, found 2 days ago
$319
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, Oct 1 from Louisville to St. Louis, returning Sat, Oct 3, priced at $319 found 2 days ago
United
Mon, Feb 22 - Tue, Feb 23
SDF
Louisville
STL
St. Louis
$321 Roundtrip, found 2 days ago
$321
Roundtrip
found 2 days ago
Select United flight, departing Mon, Feb 22 from Louisville to St. Louis, returning Tue, Feb 23, priced at $321 found 2 days ago
United
Fri, Oct 16 - Sat, Oct 17
SDF
Louisville
STL
St. Louis
$323 Roundtrip, found 3 days ago
$323
Roundtrip
found 3 days ago
Select United flight, departing Fri, Oct 16 from Louisville to St. Louis, returning Sat, Oct 17, priced at $323 found 3 days ago
Southwest Airlines
Thu, Oct 15 - Fri, Oct 16
SDF
Louisville
STL
St. Louis
$324 Roundtrip, found 3 days ago
$324
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Thu, Oct 15 from Louisville to St. Louis, returning Fri, Oct 16, priced at $324 found 3 days ago
United
Thu, Dec 24 - Fri, Jan 1
SDF
Louisville
STL
St. Louis
$325 Roundtrip, found 4 days ago
$325
Roundtrip
found 4 days ago
Select United flight, departing Thu, Dec 24 from Louisville to St. Louis, returning Fri, Jan 1, priced at $325 found 4 days ago
American Airlines
Thu, Oct 1 - Sat, Oct 3
SDF
Louisville
STL
St. Louis
$329 Roundtrip, found 2 days ago
$329
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Oct 1 from Louisville to St. Louis, returning Sat, Oct 3, priced at $329 found 2 days ago

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

January is typically the cheapest month to fly

From $214 - $511 per traveler.

What you need to know for your flight from Louisville Intl. to Lambert-St. Louis Intl.

Louisville (SDF) to St. Louis (STL) at a glance

Travel from Louisville (SDF) to St. Louis (STL) with a selection of airlines catering to this short domestic route. Discover options for flights from Louisville that range from budget-friendly choices to full-service carriers, helping you find the best itinerary to meet your travel needs. As you plan your journey to explore the well-known sights and neighborhoods of St. Louis, be sure to check the key details for flights from Louisville International Airport (SDF) to Lambert-St. Louis International Airport (STL).

  • Fastest flight duration: around 3 hours in-flight, plus roughly 1h 15m layover with one stop
  • Route distance: roughly 250 miles (400 km)
  • Flights per week: around 8 departures on average
  • Typical fares (one-way): economy tickets often range from $105–$415, depending on seasonality and how far ahead you book

Flights from Louisville International Airport (SDF) to Lambert-St. Louis International Airport (STL)

Based on the latest traveler bookings, here are the top airlines flying from Louisville to St. Louis, commonly selected for their one-stop services. Popular layover spots include O'Hare International Airport (ORD) with approximately a 1-hour and 15-minute layover, Midway International Airport (MDW) also around 1 hour and 15 minutes, and Hartsfield-Jackson Atlanta International Airport (ATL) at the same duration. This flexibility allows you to customize your journey by balancing price, total travel time, and cabin class for the ideal itinerary.

  • Delta: This full-service airline provides convenient one-stop options, with one-way tickets generally priced between $105 and $415. Delta is responsible for about 33% of departures on this route, featuring an in-flight duration of 3 hours and an overall travel time of approximately 4 hours and 30 minutes, including layovers.
  • Southwest Airlines: Known for its budget-friendly approach, Southwest offers one-stop services with one-way fares typically between $105 and $495. Similar to Delta, it represents around 33% of departures on this route, with a flying time of 3 hours and a complete journey lasting about 4 hours and 30 minutes, including layovers.
  • American Airlines: As a full-service airline, American Airlines provides one-stop flights with one-way fares ranging from $130 to $385. Covering about 26% of departures on this route, it features an in-flight time of 3 hours and a total travel duration of roughly 4 hours and 30 minutes, inclusive of layovers.
  • United: United Airlines offers a full-service experience with one-stop routes, featuring one-way fares that typically range from $130 to $265. This carrier accounts for approximately 9% of departures on the route, with a flight time of 3 hours and a total journey time of around 4 hours and 30 minutes, factoring in layovers.

Alternative routes from Louisville (SDF) to St. Louis (STL)

  • Louisville to St. Louis (LOU-STL): Bowman Field Airport (LOU) is located approximately 5 miles from Louisville International Airport (SDF), providing convenient access for travelers heading to St. Louis.
  • Louisville to St. Louis (SDF-CPS): St. Louis Downtown Airport (CPS) can be found about 16 miles from Lambert-St. Louis International Airport (STL), making it a viable option for those flying from Louisville.
  • Louisville to St. Louis (LOU-CPS): For this route, Bowman Field Airport (LOU) is roughly 5 miles from Louisville International Airport (SDF), while St. Louis Downtown Airport (CPS) lies around 16 miles from Lambert-St. Louis International Airport (STL).

How to find the best prices for flights from Louisville (SDF) to St. Louis (STL)

Getting some of the best deals on flights from Louisville to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually available when booking 2-8 weeks in advance, although most travelers tend to book within 2 weeks. Departures in the morning (5 a.m.-12 p.m.) often offer lower prices and are the most popular times to fly. Additionally, flying on Wednesday typically results in cheaper fares, while Thursday is the most favored travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Louisville International Airport

St. Louis welcomes travelers from Louisville with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is conveniently located just 0.1 miles away on foot, providing easy access to public transportation.

Frequently asked questions

How much does a flight from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $149 and cheap return flights from $297 Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights usually range from $144 to $582, and return flights typically cost between $324 and $780. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
June is the cheapest month to fly from Louisville, KY (SDF) to St. Louis, MO (STL), with average round-trip fares around $200. This is about 45% lower than the average price throughout the year, as summer travel often brings lower demand for this short route. Other affordable months to consider are January and September.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter SDF to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Southwest Airlines is one of the cheapest airlines offering connecting flights from Louisville Intl. (SDF) to Lambert-St. Louis Intl. (STL) with return tickets starting from around $493 with a layover in Dallas Love Field (DAL). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
For flights from Louisville (SDF) to St. Louis (STL), June and January are the best months to travel. Average return flight prices are around $200, making these months both economical and convenient for your travel plans.*Prices based on flights available on Expedia in the last year.
What is the earliest flight from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Louisville International Airport to St. Louis Lambert International Airport typically departs at 5:00 AM, operated by American Airlines. This is a seasonal service active in January and December. An early departure allows you to make the most of your day in St. Louis. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) are in the early morning, from 6am to 9am. About 28% of passengers prefer this time window. Many major carriers, including Delta Air Lines, American Airlines, and Southwest Airlines, offer flights during this window. This timing is favored because it allows you to arrive in St. Louis with plenty of time to enjoy your day.
How long does it take to fly from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Flights from SDF to STL with one stop typically take around 6 hours 30 minutes, covering approximately 253 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly first class between SDF and STL. First class cabins are available on:

  • American Airlines
  • Delta Air Lines
  • United Airlines
  • Spirit Airlines

How do I earn miles on a Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Louisville Intl. (SDF)?
From Louisville Intl. (SDF), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Midway Intl. (MDW), Baltimore Washington Intl. Thurgood Marshall (BWI), Love Field (DAL) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Louisville, KY (SDF-Louisville Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Louisville Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$296
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 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 2026. You can also book with separate airlines for your outbound and return journeys, from $149 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

*Flight schedules are subject to change.

*Available to One Key members.

 

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