$64 Cheap Flights to Southwest Illinois, IL

View $64 flight on Wed, Jun 24, 2026Opens in a new window

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How much is the cheapest flight to Southwest Illinois?

Prices were available within the past 7 days and start at $64 for one-way flights and $128 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Jun 26 - Mon, Jun 29
MCO
Orlando
STL
St. Louis
$128 Roundtrip, just found
$128
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Jun 26 from Orlando to St. Louis, returning Mon, Jun 29, priced at $128 just found
Southwest Airlines
Thu, Jun 11 - Sat, Jun 13
MCO
Orlando
STL
St. Louis
$258 Roundtrip, found 2 hours ago
$258
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Thu, Jun 11 from Orlando to St. Louis, returning Sat, Jun 13, priced at $258 found 2 hours ago
United
Thu, Jun 25 - Mon, Jun 29
MCO
Orlando
STL
St. Louis
$262 Roundtrip, found 2 hours ago
$262
Roundtrip
found 2 hours ago
Select United flight, departing Thu, Jun 25 from Orlando to St. Louis, returning Mon, Jun 29, priced at $262 found 2 hours ago
American Airlines
Wed, Jun 24 - Tue, Jun 30
MCO
Orlando
STL
St. Louis
$267 Roundtrip, just found
$267
Roundtrip
just found
Select American Airlines flight, departing Wed, Jun 24 from Orlando to St. Louis, returning Tue, Jun 30, priced at $267 just found
Delta
Wed, Jun 24 - Tue, Jun 30
MCO
Orlando
STL
St. Louis
$267 Roundtrip, just found
$267
Roundtrip
just found
Select Delta flight, departing Wed, Jun 24 from Orlando to St. Louis, returning Tue, Jun 30, priced at $267 just found

Alternative airports

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. Flights from $302
STL
Lambert-St. Louis Intl.
Cheapest
Flights from $302

Frequently asked questions

What month is the cheapest to fly to Southwest Illinois?
The cheapest month to fly to Southwest Illinois is June when there's less demand. Off-peak months are often when you'll find cheap fares. To save money, steer clear of flying during school breaks and public holidays.
Which US cities have the cheapest flights to Southwest Illinois?
Generally, New York, Washington and Dallas offer cheap flights to Southwest Illinois. However, flexibility is the secret to getting the best prices. Book midweek or during the off-peak season to keep costs to a minimum.
Which US cities fly direct to Southwest Illinois?
You can fly to Southwest Illinois without any stops from 150 US destinations. To find a nonstop route, use the "Direct flights only" filter when organizing your flights to Southwest Illinois on Expedia. Then, explore the options and pick the best departure out of any of these cities:

  • New York
  • Washington
  • Dallas
  • Boston
  • Phoenix

How to find a cheap flight to Southwest Illinois?
Book your trip early to increase your chances of finding cheap flights to Southwest Illinois. Also, consider visiting during off-peak months like December and January. If you fly on a Thursday, you can save 16% on average compared to those departing on a Sunday.* Save time searching every day and track your flight prices using the Expedia app. We'll update you when fares change.*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
How to get a cheap last-minute flight to Southwest Illinois?
Being flexible with your travel plans can help you find last-minute deals on cheap flights to Southwest Illinois. To view all the available options, try exploring different ticket types, tweaking your Southwest Illinois trip dates, jetting out of an alternative airport or using another airline.
How far in advance should I book a flight to Southwest Illinois?
To pick up the best deals on domestic journeys, book your flight to Southwest Illinois 28 days ahead of your travel dates. For international flights, it's between two and four months in advance. This improves your chances of locking in the departure dates and seats you want.**Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
Which day of the week is the cheapest day to buy a plane ticket to Southwest Illinois?
Sundays are usually the best day to book a cheap flight to Southwest Illinois, where you can save 8% on average compared to a Friday. If you decide to buy tickets on a Friday, expect to spend more as this is often the most expensive day.**Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
Which airlines fly to Southwest Illinois?
Choose the window or aisle seat and head to Southwest Illinois with one of these reputable airlines:

  • American Airlines - 1,079 flights to Southwest Illinois each month, including 927 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • Delta Air Lines - 723 flights to Southwest Illinois each month, including 637 flights to Lambert-St. Louis Intl. Airport (STL) per month.

Where do you fly into Southwest Illinois?
When flying to Southwest Illinois, the main airport to arrive at is Williamson County Regional Airport (MWA). You can also jet into nearby hubs like Lambert-St. Louis Intl. Airport (STL), MidAmerica-St. Louis Airport (BLV) or Mount Vernon, IL (MVN-Mount Vernon Outland). Another possibility to think about when you fly to Southwest Illinois is St. Louis Downtown Airport (CPS).
Can I save money by booking a Southwest Illinois trip package?
It's possible to save hundreds of dollars if you choose a Southwest Illinois flight and hotel package deal on Expedia. And you'll save time and hassle by having all your travel arrangements in one place. Try bundling your flight and hotel with add-ons like tours and activities for your own personalized Southwest Illinois vacation.
Can I change or cancel my flight to Southwest Illinois?
If you reserved your flight to Southwest Illinois within the last 24 hours, you can usually change or cancel it for free. After that, extra charges may apply depending on the airline's rules and restrictions. For more information, check out our Customer Service Portal. Remember that some flights are non-refundable, so you may receive a credit for a future trip rather than a direct refund. When browsing Expedia, select the "No cancel fee" or "Changes included" filters to find tickets with flexible change policies.

*Flight schedules are subject to change.

*Available to One Key members.

 

Travel information

Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
$70

Trending flights to Southwest Illinois

Prices were available within the past 7 days and start at $64 for one-way flights and $128 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, May 12 - Fri, May 15
EWR
New York
STL
St. Louis
$160 Roundtrip, just found
$160
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, May 12 from New York to St. Louis, returning Fri, May 15, priced at $160 just found

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