Cheap Flights To Southwest Illinois 2025

Southwest Illinois Flights as Low as $189

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Sat, Aug 2 - Fri, Aug 8
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$189 Roundtrip, found 1 day ago
$189
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Sat, Aug 2 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Fri, Aug 8, priced at $189 found 1 day ago
Spirit Airlines
Thu, Aug 28 - Thu, Sep 4
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$198 Roundtrip, found 5 days ago
$198
Roundtrip
found 5 days ago
Select Spirit Airlines flight, departing Thu, Aug 28 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Thu, Sep 4, priced at $198 found 5 days ago
Spirit Airlines
Sat, Aug 2 - Thu, Aug 7
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$199 Roundtrip, found 1 day ago
$199
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Sat, Aug 2 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Thu, Aug 7, priced at $199 found 1 day ago
Frontier Airlines
Sat, Jul 12 - Thu, Jul 17
IAD
Washington Dulles Intl.
STL
Lambert-St. Louis Intl.
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, Jul 12 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Thu, Jul 17, priced at $201 found 1 day ago
Frontier Airlines
Tue, Jul 8 - Sat, Jul 12
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$201 Roundtrip, found 1 day ago
$201
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Jul 8 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sat, Jul 12, priced at $201 found 1 day ago
Spirit Airlines
Thu, Jul 31 - Fri, Aug 8
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$209 Roundtrip, found 1 day ago
$209
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Thu, Jul 31 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Fri, Aug 8, priced at $209 found 1 day ago
Frontier Airlines
Fri, Aug 29 - Sat, Aug 30
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$210 Roundtrip, found 5 days ago
$210
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Fri, Aug 29 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sat, Aug 30, priced at $210 found 5 days ago
Frontier Airlines
Thu, Jul 10 - Fri, Jul 11
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$212 Roundtrip, found 1 day ago
$212
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Jul 10 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Fri, Jul 11, priced at $212 found 1 day ago
Delta
Fri, Jul 4 - Sat, Jul 5
DCA
Ronald Reagan Washington National
STL
Lambert-St. Louis Intl.
$217 Roundtrip, found 4 days ago
$217
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Jul 4 from Ronald Reagan Washington National to Lambert-St. Louis Intl., returning Sat, Jul 5, priced at $217 found 4 days ago
Spirit Airlines
Thu, Jul 31 - Sun, Aug 3
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$219 Roundtrip, found 1 day ago
$219
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Thu, Jul 31 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sun, Aug 3, priced at $219 found 1 day ago
Frontier Airlines
Thu, Jul 31 - Sat, Aug 9
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$223 Roundtrip, found 1 day ago
$223
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Jul 31 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sat, Aug 9, priced at $223 found 1 day ago
Frontier Airlines
Thu, Jul 10 - Mon, Jul 14
DCA
Ronald Reagan Washington National
STL
Lambert-St. Louis Intl.
$227 Roundtrip, found 1 day ago
$227
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Jul 10 from Ronald Reagan Washington National to Lambert-St. Louis Intl., returning Mon, Jul 14, priced at $227 found 1 day ago
Frontier Airlines
Thu, Jul 31 - Wed, Aug 6
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$228 Roundtrip, found 1 day ago
$228
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Jul 31 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Aug 6, priced at $228 found 1 day ago
American Airlines
Sun, Aug 10 - Fri, Aug 15
DCA
Ronald Reagan Washington National
STL
Lambert-St. Louis Intl.
$229 Roundtrip, found 1 day ago
$229
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sun, Aug 10 from Ronald Reagan Washington National to Lambert-St. Louis Intl., returning Fri, Aug 15, priced at $229 found 1 day ago
Delta
Fri, Jul 4 - Wed, Jul 9
DCA
Ronald Reagan Washington National
STL
Lambert-St. Louis Intl.
$233 Roundtrip, found 4 days ago
$233
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Jul 4 from Ronald Reagan Washington National to Lambert-St. Louis Intl., returning Wed, Jul 9, priced at $233 found 4 days ago
United
Sun, Aug 10 - Fri, Aug 15
DCA
Ronald Reagan Washington National
STL
Lambert-St. Louis Intl.
$249 Roundtrip, found 1 day ago
$249
Roundtrip
found 1 day ago
Select United flight, departing Sun, Aug 10 from Ronald Reagan Washington National to Lambert-St. Louis Intl., returning Fri, Aug 15, priced at $249 found 1 day ago

Flights to Southwest Illinois

If a trip to Southwest Illinois is calling your name, then book your next flight to (airport). And with the AARP Travel Center Powered by Expedia®, you are taken care of. AARP Travel features their members-only discount with the best rates from Expedia, so members get the best price in travel, guaranteed. AARP members pay no booking fees on flights, and often receive exclusive rates on hotels and car rentals.

Once you have entered your departure point and destination, we will show you a full list of deals for your route. Do not forget to look at flights to alternative airports nearby, which can help you get a lower fare.

Transportation at the Airport

Once you have got your flight scheduled to Southwest Illinois, you may want to book a car so you can get around on your own. You can request Southwest Illinois car rentals under our cars tab and get in the car as soon as you step outside. If you don't need a rental car, there are other ground transportation options such as ride hailing applications, shuttle, limousine, and taxi services.

Things to Do in Southwest Illinois

If you aren't sure where to start, we can help you with that as well. Not to worry—there's so many things to do in this city. Southwest Illinois has so much to do, and we can help you get started.

If you're looking for some fun activities to do in Southwest Illinois, make sure you check out our "Things to Do in Southwest Illinois" page for excursions and activities for the whole family.

Book Your Hotel in Southwest Illinois

Southwest Illinois has hotel to choose from, make sure you check out our hotel listings tab for some great recommendations from past visitors. No matter where you stay, just remember that you'll get the best for your trip when you book your stay with us.

Book Your Southwest Illinois Trip to Southwest Illinois

Once you've planned your travel dates, allow us here at AARP Travel to connect you with inexpensive tickets to Southwest Illinois. Do not wait a moment longer—book your airfare today and land in Southwest Illinois tomorrow.