$174 Cheap Flights from Lafayette (LAF) to St. Louis (STL)

View $174 flight on Sat, Aug 23, 2025Opens in a new window

Popular airlines from Lafayette, IN (LAF-Purdue University) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Lafayette to St. Louis (LAF-STL)

Prices were available within the past 7 days and start at $174 for one-way flights and $346 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$346 Roundtrip, found 2 days ago
$346
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $346 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$399 Roundtrip, found 2 days ago
$399
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $399 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$421 Roundtrip, found 2 days ago
$421
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $421 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$425 Roundtrip, found 2 days ago
$425
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $425 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$442 Roundtrip, found 2 days ago
$442
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $442 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$476 Roundtrip, found 2 days ago
$476
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $476 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$501 Roundtrip, found 2 days ago
$501
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $501 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$568 Roundtrip, found 2 days ago
$568
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $568 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$667 Roundtrip, found 2 days ago
$667
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $667 found 2 days ago
United
Fri, Aug 22 - Sat, Aug 23
LAF
Lafayette
STL
St. Louis
$742 Roundtrip, found 2 days ago
$742
Roundtrip
found 2 days ago
Select United flight, departing Fri, Aug 22 from Lafayette to St. Louis, returning Sat, Aug 23, priced at $742 found 2 days ago
Flights from Lafayette (LAF) to St. Louis (STL)
Origin airport
Purdue University
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$346
Distance
216 mi

Lafayette to St. Louis Flights

The cheapest times to fly from Lafayette 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 Lafayette to St. Louis are during the month of August. You can find some of the cheapest flights from Lafayette to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Lafayette 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 Lafayette 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 Lafayette to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $174 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 Lafayette 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 Lafayette 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.

 

Frequently asked questions

How much does a flight from Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL) cost?
Snag a cheap one-way flight from $174 or cheap return flight from $346 from Lafayette, IN (LAF-Purdue University) 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 deals on this route.
What is the cheapest month to fly from Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL)?
August is the least expensive month to fly from LAF to STL. Traveling during quieter months is often the key to better flight prices.
What is the cheapest airline that flies from Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from LAF to STL. Then, sort your results by "Price (lowest to highest)" to score a great deal.
How many flights per day from Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from LAF to STL?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on a range of factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL) route, aim to travel before 3 PM. Departures after this hour 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 Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from LAF to STL shortly before your trip is generally more expensive. But if there's some wiggle room with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book a LAF to STL flight and hotel package?
You can save money by securing a LAF to STL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. Once you've selected your ideal flights and accommodations, you can add extras like car rentals, tours and activities.
Can I cancel or change the date of my flight from Lafayette, IN (LAF-Purdue University) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your LAF to STL flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

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*Available to One Key members.