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Southwest Illinois

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Southwest Illinois Flights as Low as $205

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

Frontier Airlines
Tue, Jun 2 - Tue, Jun 16
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$205 Roundtrip, found 5 days ago
$205
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Tue, Jun 2 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 16, priced at $205 found 5 days ago
Frontier Airlines
Thu, Jun 4 - Tue, Jun 16
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$219 Roundtrip, found 5 days ago
$219
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Jun 4 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 16, priced at $219 found 5 days ago
Frontier Airlines
Mon, Jun 1 - Tue, Jun 16
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$226 Roundtrip, found 5 days ago
$226
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Mon, Jun 1 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 16, priced at $226 found 5 days ago
Frontier Airlines
Thu, May 28 - Tue, Jun 9
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$230 Roundtrip, found 5 days ago
$230
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, May 28 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 9, priced at $230 found 5 days ago
Bargain Flight
Tue, May 19 - Tue, Jun 9
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$233 Roundtrip, found 6 days ago
$233
Roundtrip
found 6 days ago
Select Bargain Flight flight, departing Tue, May 19 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 9, priced at $233 found 6 days ago
American Airlines
Thu, May 28 - Tue, Jun 9
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$234 Roundtrip, found 6 days ago
$234
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 28 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 9, priced at $234 found 6 days ago
Frontier Airlines
Thu, Jun 4 - Sun, Jun 14
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$240 Roundtrip, found 5 days ago
$240
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Jun 4 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sun, Jun 14, priced at $240 found 5 days ago
Frontier Airlines
Sun, Jun 21 - Fri, Jul 10
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$240 Roundtrip, found 5 days ago
$240
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Sun, Jun 21 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Fri, Jul 10, priced at $240 found 5 days ago
Frontier Airlines
Thu, May 28 - Mon, Jun 8
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$244 Roundtrip, found 5 days ago
$244
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, May 28 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, Jun 8, priced at $244 found 5 days ago
Bargain Flight
Tue, Jul 7 - Sat, Jul 18
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$246 Roundtrip, found 6 days ago
$246
Roundtrip
found 6 days ago
Select Bargain Flight flight, departing Tue, Jul 7 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sat, Jul 18, priced at $246 found 6 days ago
Frontier Airlines
Wed, Jun 3 - Tue, Jun 16
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$246 Roundtrip, found 5 days ago
$246
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Wed, Jun 3 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 16, priced at $246 found 5 days ago
Frontier Airlines
Thu, Jun 4 - Wed, Jun 17
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$260 Roundtrip, found 5 days ago
$260
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Jun 4 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Jun 17, priced at $260 found 5 days ago
American Airlines
Thu, May 28 - Tue, Jun 9
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$267 Roundtrip, found 6 days ago
$267
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, May 28 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jun 9, priced at $267 found 6 days ago
Delta
Tue, Jul 7 - Wed, Jul 15
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$322 Roundtrip, found 1 day ago
$322
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Jul 7 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Jul 15, priced at $322 found 1 day ago
Bargain Flight
Wed, Jun 10 - Tue, Jun 23
BWI
Baltimore Washington Intl. Thurgood Marshall
PAH
Barkley Regional
$432 Roundtrip, found 1 day ago
$432
Roundtrip
found 1 day ago
Select Bargain Flight flight, departing Wed, Jun 10 from Baltimore Washington Intl. Thurgood Marshall to Barkley Regional, returning Tue, Jun 23, priced at $432 found 1 day ago
United
Tue, Jul 7 - Tue, Jul 14
BWI
Baltimore Washington Intl. Thurgood Marshall
CGI
Cape Girardeau Municipal
$456 Roundtrip, found 4 days ago
$456
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jul 7 from Baltimore Washington Intl. Thurgood Marshall to Cape Girardeau Municipal, returning Tue, Jul 14, priced at $456 found 4 days ago

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 June, 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 13 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 $205, 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 $205 right now, why wait?

Southwest Illinois Flight Information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Roundtrip price
$410

Last Minute Hotel Deals in Southwest Illinois

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! (1,000 reviews)
Everything was nice

Reviewed on May 13, 2026

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Drury Inn & Suites St. Louis Fairview Heights
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! (1,679 reviews)
Staff friendly and set up great

Reviewed on May 12, 2026

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Drury Plaza Hotel Mt. Vernon
Walker's Bluff Casino Resort

Walker's Bluff Casino Resort

4.5 out of 5
777 Walkers Bluff Way Carterville IL
Book a stay at this luxury resort in Carterville. Enjoy free WiFi, free parking, and an outdoor pool. Our guests praise the helpful staff and the clean rooms ...
9.4/10 Exceptional! (450 reviews)
Had to buy drinks in casino and was price for them

Reviewed on May 12, 2026

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Walker's Bluff Casino Resort
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 (1,001 reviews)
Bed was comfy and shower was hot. No complaints as I was passing through and just looking for a place to lay my head! Would stay here again!

Reviewed on May 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! (1,003 reviews)
Wish there was a refrigerator in room. People down hall alottle loud after 10pm

Reviewed on May 13, 2026

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

Quality Inn O'Fallon IL - St. Louis

3 out of 5
1409 W US 50 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 ...
7.4/10 Good! (1,011 reviews)
The rooms were clean but outdated and in need of repair or upkeep. The breakfast consisted of one waffle maker white bread for toast instant oatmeal packs and stale cereal. We have stayed here multiple times over the last 4 years while visiting our daughter in college and it has gone downhill ...

Reviewed on May 14, 2026

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Quality Inn O'Fallon IL - St. Louis
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! (1,002 reviews)
Blood stains on sheets

Reviewed on May 10, 2026

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Quality Inn & Suites near St. Louis and I-255
Holiday Inn Express & Suites Mount Vernon by IHG

Holiday Inn Express & Suites Mount Vernon by IHG

2.5 out of 5
300 Potomac Blvd 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 ...
9/10 Wonderful! (1,001 reviews)
yes

Reviewed on May 12, 2026

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Holiday Inn Express & Suites Mount Vernon by IHG
See all 761 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.