Cheap Flights from Lafayette (LAF) to St. Louis (CPS)

Popular airlines from Lafayette, IN (LAF-Purdue University) to St. Louis, MO (CPS-St. Louis Downtown)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

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

Frequently asked questions

How much does a flight from Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS) cost?
Get a cheap one-way flight or cheap return flight from Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS)?
The cheapest month to fly from LAF to CPS is , when there's less demand. Off-peak season is typically when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS)?
To find the cheapest airline flying from LAF to CPS, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS)?
You'll need to book a flight with a layover when traveling from Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from LAF to CPS?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change based 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 St. Louis Downtown Airport (CPS)?
To avoid possible delays on the Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS) route, fly before 3 PM. Later departures have a 22% higher chance of cancellation.**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 St. Louis Downtown Airport (CPS) last-minute?
Booking your plane ticket from LAF to CPS right before your trip is generally more expensive. But if there's some wiggle room with your departure dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a LAF to CPS flight and hotel package?
Securing a LAF to CPS flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Select from our wide range of accommodations and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lafayette, IN (LAF-Purdue University) to St. Louis Downtown Airport (CPS)?
Usually, it's possible to reschedule or cancel your LAF to CPS flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Travel information

Origin airport
Purdue University
Destination airport
St. Louis Downtown
Distance
213 mi

Book with confidence

Book with confidence

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 . 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 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.

 

Lafayette to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.