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Southwest Illinois

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Southwest Illinois Flights as Low as $237

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Bargain Flight
Tue, Jul 7 - Wed, Jul 15
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$237 Roundtrip, found 2 hours ago
$237
Roundtrip
found 2 hours ago
Select Bargain Flight flight, departing Tue, Jul 7 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Jul 15, priced at $237 found 2 hours ago
Frontier Airlines
Fri, Jul 24 - Mon, Jul 27
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$246 Roundtrip, found 1 day ago
$246
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Jul 24 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, Jul 27, priced at $246 found 1 day ago
Bargain Flight
Thu, Jul 2 - Tue, Jul 7
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$247 Roundtrip, found 13 hours ago
$247
Roundtrip
found 13 hours ago
Select Bargain Flight flight, departing Thu, Jul 2 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jul 7, priced at $247 found 13 hours ago
Delta
Tue, Sep 22 - Wed, Sep 23
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$249 Roundtrip, found 2 days ago
$249
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Sep 22 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Sep 23, priced at $249 found 2 days ago
Frontier Airlines
Wed, Jul 22 - Fri, Jul 24
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$250 Roundtrip, found 1 day ago
$250
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 22 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Fri, Jul 24, priced at $250 found 1 day ago
Frontier Airlines
Tue, Jul 7 - Sat, Jul 18
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$255 Roundtrip, found 3 days ago
$255
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Tue, Jul 7 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sat, Jul 18, priced at $255 found 3 days ago
Frontier Airlines
Tue, Jul 21 - Fri, Jul 24
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$256 Roundtrip, found 1 day ago
$256
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Jul 21 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Fri, Jul 24, priced at $256 found 1 day ago
Delta
Tue, Sep 22 - Wed, Sep 23
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$257 Roundtrip, found 2 days ago
$257
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Sep 22 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Sep 23, priced at $257 found 2 days ago
American Airlines
Tue, Sep 22 - Wed, Sep 23
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$257 Roundtrip, found 2 days ago
$257
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Sep 22 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Sep 23, priced at $257 found 2 days ago
Frontier Airlines
Thu, Jul 23 - Sun, Jul 26
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$257 Roundtrip, found 1 day ago
$257
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Jul 23 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sun, Jul 26, priced at $257 found 1 day ago
Frontier Airlines
Wed, Jul 22 - Sun, Jul 26
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$261 Roundtrip, found 1 day ago
$261
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 22 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sun, Jul 26, priced at $261 found 1 day ago
Frontier Airlines
Tue, Jul 7 - Wed, Jul 15
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$264 Roundtrip, found 2 hours ago
$264
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Tue, Jul 7 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Jul 15, priced at $264 found 2 hours ago
Frontier Airlines
Fri, Jul 24 - Mon, Jul 27
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$267 Roundtrip, found 1 day ago
$267
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Jul 24 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, Jul 27, priced at $267 found 1 day ago
Frontier Airlines
Mon, Jul 6 - Sat, Jul 18
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$270 Roundtrip, found 6 days ago
$270
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Mon, Jul 6 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sat, Jul 18, priced at $270 found 6 days ago
American Airlines
Tue, Sep 22 - Thu, Sep 24
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$271 Roundtrip, found 8 hours ago
$271
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Tue, Sep 22 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Thu, Sep 24, priced at $271 found 8 hours ago
American Airlines
Tue, Jul 7 - Tue, Jul 14
BWI
Baltimore Washington Intl. Thurgood Marshall
CGI
Cape Girardeau Municipal
$415 Roundtrip, just found
$415
Roundtrip
just found
Select American Airlines flight, departing Tue, Jul 7 from Baltimore Washington Intl. Thurgood Marshall to Cape Girardeau Municipal, returning Tue, Jul 14, priced at $415 just found

Cheap Flights to Southwest Illinois

Fall in love at first flight with your vacation to Southwest Illinois by saving a ton of cash on your last-minute cheap flight. There’s no more scouring the internet for a good deal—book your flight to Southwest Illinois on Hotwire, and you’ll be up, up, and on a getaway in no time.

Because once the wheels are down in Southwest Illinois, the good times start rolling. So buckle up, you’re in for a fun ride.

Frequently Asked Questions About flights to Southwest Illinois

Don’t waste your time on endless searches for cheap airline tickets oneway or roundtrip. We’ll have you on your way to Southwest Illinois with a tiny bag of pretzels in your hand before you can say “tray tables in the upright position”—and for a ticket price that works for your vacay budget.

So all you have to worry about is where you’re headed after the STL airport.

What is the cheapest month to fly to Southwest Illinois?

Airline ticket prices fluctuate all the time, depending on the day of the week or the month of the year. The cheapest round trip flights to Southwest Illinois are in July, but when you book your flight on Hotwire, savings are always in season.

How many airlines fly to Southwest Illinois?

Variety is the spice of life, even when it comes to booking your next trip. Want options for airlines? You’ll find 14 to choose from for your flight to Southwest Illinois.

What airport is best to fly into Southwest Illinois?

When you’re planning your trip to Southwest Illinois, convenience is the name of the game. Luckily, Southwest Illinois Veterans Airport of Southern Illinois Airport is nearby so you can deplane and get going on checking off everything on your Southwest Illinois must-do list.

How much are flights to Southwest Illinois?

Got very cheap flights on your vacation itinerary? When you book your airline tickets to Southwest Illinois on Hotwire, you may just get what’s on your getaway wish list. With tickets as low as $237, you’ll have leftover cash for at least a magazine and a bottle of water at the airport book store.

How to get cheap flights to Southwest Illinois?

The trick to saving a stack of cash on your flight to Southwest Illinois? Snatch up that Hotwire flight deal when you see a killer rate because it could be gone in a flash. And with flights as low as $237 right now, why wait?

Southwest Illinois Flight Information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Roundtrip price
$236

Last Minute Hotel Deals in Southwest Illinois

Drury Plaza Hotel Mt. Vernon

Drury Plaza Hotel Mt. Vernon

3.5 out of 5
145 North 44th Street  Mount Vernon IL
Book a stay at this business-friendly hotel in Mount Vernon. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful ...
9.6/10 Exceptional! (1,730 reviews)
"Staff was very pleasant, our room was very nice and entire hotel was clean, shiny and classy!"

Reviewed on Jun 11, 2026

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Drury Plaza Hotel Mt. Vernon
Drury Inn & Suites St. Louis Fairview Heights

Drury Inn & Suites St. Louis Fairview Heights

3 out of 5
12 Ludwig Dr Fairview Heights IL
Book a stay at this business-friendly hotel in Fairview Heights. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful ...
9.2/10 Wonderful! (1,020 reviews)
"Room was clean ,staff helpful, breakfast good"

Reviewed on Jun 14, 2026

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Drury Inn & Suites St. Louis Fairview Heights
Super 8 by Wyndham O'Fallon

Super 8 by Wyndham O'Fallon

2 out of 5
1100 Eastgate Dr O'Fallon IL
Book a stay at this business-friendly hotel in O'Fallon. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the clean ...
6.8/10 (1,010 reviews)
"Fine"

Reviewed on Jun 12, 2026

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Super 8 by Wyndham O'Fallon
Drury Inn & Suites St. Louis O'Fallon, IL

Drury Inn & Suites St. Louis O'Fallon, IL

3 out of 5
1118 Central Park Drive O'Fallon IL
Book a stay at this business-friendly hotel in O'Fallon. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful staff ...
9.6/10 Exceptional! (1,005 reviews)
"A clean room but most impressive was the kind and courteous staff. Breakfast was plentiful and area kept clean. Dinner was impressive considering one usually doesn’t get an evening snack/ dinner with drinks served and included with room. Great for families and events. The hotel was busy and full ..."

Reviewed on Jun 13, 2026

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Drury Inn & Suites St. Louis O'Fallon, IL
Drury Inn & Suites Marion

Drury Inn & Suites Marion

3 out of 5
2706 W DeYoung St Marion IL
Book a stay at this business-friendly hotel in Marion. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful staff ...
9.4/10 Exceptional! (1,016 reviews)
"Great stay. Staff and property was excellent"

Reviewed on Jun 11, 2026

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Drury Inn & Suites Marion
The Principal Hotel

The Principal Hotel

3.5 out of 5
310 S Main St Columbia IL
Stay at this hotel in Columbia. Enjoy free WiFi, free parking, and a fitness center. Popular attractions Triple Lakes Golf Course and Eckert’s Millstadt Farm ...
9.6/10 Exceptional! (296 reviews)
"Everything was so nice, highly recommended. 10/10 The only downside was, bathroom door, barn door, no looks. Perfect for a couple not for family. But my experience was 100% fantastic."

Reviewed on Jun 13, 2026

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The Principal Hotel
Quality Inn & Suites near St. Louis and I-255

Quality Inn & Suites near St. Louis and I-255

2.5 out of 5
1607 Pontiac Dr East St. Louis IL
Book a stay at this business-friendly hotel in East St. Louis. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the ...
7.4/10 Good! (1,007 reviews)
"Decent place to stay. I appreciate the breakfast option. Staff very friendly."

Reviewed on Jun 12, 2026

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Quality Inn & Suites near St. Louis and I-255
Welcome Suites

Welcome Suites

2 out of 5
148 Regency Park O'Fallon IL
Book a stay at this business-friendly hotel in O'Fallon. Enjoy free WiFi, free parking, and a fitness center. Popular attractions O'Fallon Family Sports Park ...
5.8/10 (275 reviews)
"1. I always do the book now and pay later so I know what I’m paying for when I get to the hotel 2. I called the hotel to make sure me arriving early the next morning was ok and they said yes and for some reason they checked me in and charged my card. 3. I wasn’t made aware of that til I went to cancel ..."

Reviewed on Jun 8, 2026

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Welcome Suites
See all 758 properties in Southwest Illinois
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.