$173 Cheap Flights from Marion (MWA) to St. Louis (STL)

View $173 flight on Thu, Oct 9, 2025Opens in a new window

Popular airlines from Marion, IL (MWA-Williamson County Regional) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Marion to St. Louis (MWA-STL)

Prices were available within the past 7 days and start at $173 for one-way flights and $306 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Contour Airlines
Thu, Oct 23 - Tue, Nov 11
MWA
Marion
STL
St. Louis
$306 Roundtrip, found 19 hours ago
$306
Roundtrip
found 19 hours ago
Select Contour Airlines flight, departing Thu, Oct 23 from Marion to St. Louis, returning Tue, Nov 11, priced at $306 found 19 hours ago
Contour Airlines
Thu, Oct 30 - Fri, Nov 14
MWA
Marion
STL
St. Louis
$313 Roundtrip, found 19 hours ago
$313
Roundtrip
found 19 hours ago
Select Contour Airlines flight, departing Thu, Oct 30 from Marion to St. Louis, returning Fri, Nov 14, priced at $313 found 19 hours ago
Contour Airlines
Mon, Sep 29 - Sat, Oct 4
MWA
Marion
STL
St. Louis
$322 Roundtrip, found 4 days ago
$322
Roundtrip
found 4 days ago
Select Contour Airlines flight, departing Mon, Sep 29 from Marion to St. Louis, returning Sat, Oct 4, priced at $322 found 4 days ago
Contour Airlines
Tue, Oct 21 - Sat, Oct 25
MWA
Marion
STL
St. Louis
$326 Roundtrip, found 22 hours ago
$326
Roundtrip
found 22 hours ago
Select Contour Airlines flight, departing Tue, Oct 21 from Marion to St. Louis, returning Sat, Oct 25, priced at $326 found 22 hours ago
Contour Airlines
Fri, Nov 7 - Thu, Nov 27
MWA
Marion
STL
St. Louis
$333 Roundtrip, found 2 days ago
$333
Roundtrip
found 2 days ago
Select Contour Airlines flight, departing Fri, Nov 7 from Marion to St. Louis, returning Thu, Nov 27, priced at $333 found 2 days ago
Contour Airlines
Wed, Dec 17 - Wed, Dec 31
MWA
Marion
STL
St. Louis
$341 Roundtrip, found 5 days ago
$341
Roundtrip
found 5 days ago
Select Contour Airlines flight, departing Wed, Dec 17 from Marion to St. Louis, returning Wed, Dec 31, priced at $341 found 5 days ago
Contour Airlines
Tue, Oct 28 - Sat, Nov 15
MWA
Marion
STL
St. Louis
$343 Roundtrip, found 19 hours ago
$343
Roundtrip
found 19 hours ago
Select Contour Airlines flight, departing Tue, Oct 28 from Marion to St. Louis, returning Sat, Nov 15, priced at $343 found 19 hours ago
Contour Airlines
Thu, Oct 23 - Mon, Nov 10
MWA
Marion
STL
St. Louis
$345 Roundtrip, found 19 hours ago
$345
Roundtrip
found 19 hours ago
Select Contour Airlines flight, departing Thu, Oct 23 from Marion to St. Louis, returning Mon, Nov 10, priced at $345 found 19 hours ago
Contour Airlines
Mon, Oct 6 - Sat, Oct 18
MWA
Marion
STL
St. Louis
$346 Roundtrip, found 19 hours ago
$346
Roundtrip
found 19 hours ago
Select Contour Airlines flight, departing Mon, Oct 6 from Marion to St. Louis, returning Sat, Oct 18, priced at $346 found 19 hours ago
Contour Airlines
Tue, Oct 28 - Fri, Nov 14
MWA
Marion
STL
St. Louis
$350 Roundtrip, found 19 hours ago
$350
Roundtrip
found 19 hours ago
Select Contour Airlines flight, departing Tue, Oct 28 from Marion to St. Louis, returning Fri, Nov 14, priced at $350 found 19 hours ago

Frequently asked questions

How much does a flight from Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $173 or cheap return flight from $306 from Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL) 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 Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from MWA to STL is October, when demand is low. Off-peak season is typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll take you from MWA to STL. Then, sort your results by "Price (lowest to highest)" to pick up a great deal.
How many flights per day from Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL)?
You'll need to take a flight with a layover if you're traveling from Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from MWA to STL?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL)?
To reach Lambert-St. Louis Intl. Airport (STL) on schedule, opt for a flight that leaves from Williamson County Regional Airport (MWA) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until just before your trip to book a flight from MWA to STL often results in higher prices. While you may find some last-minute deals, they're not always guaranteed. Keep your travel schedule open to maximize your chances of landing a bargain.
Is it cheaper to book a MWA to STL flight and hotel package?
You can save money by securing a MWA 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 it all in one place. After selecting your preferred accommodations and flights, consider adding extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Williamson County Regional Airport (MWA) to Lambert-St. Louis Intl. Airport (STL)?
Generally, it's possible to reschedule or cancel your MWA to STL flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Williamson County Regional
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$306
Distance
100 mi

Book with confidence

Book with confidence

Marion to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Marion 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 Marion 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 Marion to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $173 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 Marion 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 Marion 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.

 

Marion to St. Louis Flights

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*Available to One Key members.