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Southwest Illinois

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Southwest Illinois Flights as Low as $63

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

Frontier Airlines
Wed, Feb 19 - Wed, Feb 26
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$63 Roundtrip, found 2 days ago
$63
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Wed, Feb 19 from Denver Intl. to Lambert-St. Louis Intl., returning Wed, Feb 26, priced at $63 found 2 days ago
Frontier Airlines
Wed, Feb 5 - Sat, Feb 8
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$68 Roundtrip, found 1 day ago
$68
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Feb 5 from Denver Intl. to Lambert-St. Louis Intl., returning Sat, Feb 8, priced at $68 found 1 day ago
Frontier Airlines
Fri, Jan 31 - Sat, Feb 8
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$78 Roundtrip, found 1 day ago
$78
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Jan 31 from Denver Intl. to Lambert-St. Louis Intl., returning Sat, Feb 8, priced at $78 found 1 day ago
Frontier Airlines
Fri, Feb 14 - Sat, Feb 15
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$83 Roundtrip, found 2 days ago
$83
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Feb 14 from Denver Intl. to Lambert-St. Louis Intl., returning Sat, Feb 15, priced at $83 found 2 days ago
Frontier Airlines
Sat, Feb 1 - Sat, Feb 8
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$88 Roundtrip, found 4 hours ago
$88
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, Feb 1 from Denver Intl. to Lambert-St. Louis Intl., returning Sat, Feb 8, priced at $88 found 4 hours ago
Frontier Airlines
Wed, Feb 5 - Mon, Feb 10
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$94 Roundtrip, found 1 day ago
$94
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Feb 5 from Denver Intl. to Lambert-St. Louis Intl., returning Mon, Feb 10, priced at $94 found 1 day ago
Frontier Airlines
Sat, Feb 1 - Fri, Feb 7
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$98 Roundtrip, found 4 hours ago
$98
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, Feb 1 from Denver Intl. to Lambert-St. Louis Intl., returning Fri, Feb 7, priced at $98 found 4 hours ago
Frontier Airlines
Fri, Jan 31 - Mon, Feb 10
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$104 Roundtrip, found 1 day ago
$104
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Jan 31 from Denver Intl. to Lambert-St. Louis Intl., returning Mon, Feb 10, priced at $104 found 1 day ago
Frontier Airlines
Wed, Apr 2 - Mon, Apr 7
IAH
George Bush Intercontinental
STL
Lambert-St. Louis Intl.
$120 Roundtrip, found 19 hours ago
$120
Roundtrip
found 19 hours ago
Select Frontier Airlines flight, departing Wed, Apr 2 from George Bush Intercontinental to Lambert-St. Louis Intl., returning Mon, Apr 7, priced at $120 found 19 hours ago
Frontier Airlines
Tue, Feb 11 - Tue, Feb 18
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$120 Roundtrip, found 2 days ago
$120
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, Feb 11 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Feb 18, priced at $120 found 2 days ago
United
Tue, Apr 1 - Mon, Apr 7
IAH
George Bush Intercontinental
STL
Lambert-St. Louis Intl.
$177 Roundtrip, found 19 hours ago
$177
Roundtrip
found 19 hours ago
Select United flight, departing Tue, Apr 1 from George Bush Intercontinental to Lambert-St. Louis Intl., returning Mon, Apr 7, priced at $177 found 19 hours ago
Spirit Airlines
Mon, Feb 10 - Thu, Feb 20
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$196 Roundtrip, found 2 days ago
$196
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Mon, Feb 10 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Thu, Feb 20, priced at $196 found 2 days ago
Delta
Tue, Mar 18 - Wed, Mar 19
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$197 Roundtrip, found 18 hours ago
$197
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, Mar 18 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Mar 19, priced at $197 found 18 hours ago
American Airlines
Tue, Mar 18 - Wed, Mar 19
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$197 Roundtrip, found 18 hours ago
$197
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Tue, Mar 18 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Wed, Mar 19, priced at $197 found 18 hours ago
American Airlines
Thu, Feb 20 - Tue, Feb 25
IAH
George Bush Intercontinental
PAH
Barkley Regional
$394 Roundtrip, found 4 days ago
$394
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Feb 20 from George Bush Intercontinental to Barkley Regional, returning Tue, Feb 25, priced at $394 found 4 days ago
Alaska Airlines
Thu, Apr 24 - Sun, Apr 27
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$572 Roundtrip, found 2 days ago
$572
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Apr 24 from Denver Intl. to Lambert-St. Louis Intl., returning Sun, Apr 27, priced at $572 found 2 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 February, 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 16 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 Williamson County Regional 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 $63, 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 $63 right now, why wait?

Southwest Illinois Flight Information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Roundtrip price
$63

Last Minute Hotel Deals in Southwest Illinois

Drury Plaza Hotel Mt. Vernon
Drury Plaza Hotel Mt. Vernon
3 out of 5
145 North 44th Street , Mount Vernon, IL
The price is $122 per night from Jan 31 to Feb 1
$122
includes taxes & fees
Jan 31 - Feb 1
Stay at this 3-star 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! (1,215 reviews)
"Liked the bar and kitchen, the actual silverware and glass glasses! All staff exceedingly friendly!"

Reviewed on Jan 21, 2025

Drury Plaza Hotel Mt. Vernon
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
The price is $120 per night from Feb 2 to Feb 3
$120
includes taxes & fees
Feb 2 - Feb 3
Stay at this 3-star business-friendly hotel in O'Fallon. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful staff ...
9.4/10 Exceptional! (1,005 reviews)
"My experience was absolutely amazing! Everyone on staff was kind and professional"

Reviewed on Jan 25, 2025

Drury Inn & Suites St. Louis O'Fallon, IL
Red Lion Inn & Suites Pontoon Beach
Red Lion Inn & Suites Pontoon Beach
2.5 out of 5
1240 E Chain Of Rocks Rd, Granite City, IL
The price is $67 per night from Jan 28 to Jan 29
$67
includes taxes & fees
Jan 28 - Jan 29
Stay at this hotel in Granite City. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff in our reviews. Popular attractions ...
8/10 Very Good! (248 reviews)
"I like it it’s clean and people is nice and I come here every time I come into town"

Reviewed on Jan 18, 2025

Red Lion Inn & Suites Pontoon Beach
Super 8 by Wyndham O'Fallon
Super 8 by Wyndham O'Fallon
2 out of 5
1100 Eastgate Dr, O'Fallon, IL
The price is $59 per night from Feb 2 to Feb 3
$59
includes taxes & fees
Feb 2 - Feb 3
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 ...
7.6/10 Good! (1,000 reviews)
"Good"

Reviewed on Jan 19, 2025

Super 8 by Wyndham O'Fallon
Drury Inn & Suites Marion
Drury Inn & Suites Marion
3 out of 5
2706 W DeYoung St, Marion, IL
The price is $140 per night from Feb 2 to Feb 3
$140
includes taxes & fees
Feb 2 - Feb 3
Stay at this 3-star 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! (1,003 reviews)
"Drury helped us celebrate our daughter’s birthday and Dad’s birthday all in one spot."

Reviewed on Jan 20, 2025

Drury Inn & Suites Marion
Walker's Bluff Casino Resort
Walker's Bluff Casino Resort
4.5 out of 5
777 Walkers Bluff Way, Carterville, IL
The price is $144 per night from Jan 28 to Jan 29
$144
includes taxes & fees
Jan 28 - Jan 29
Stay at this 4.5-star luxury resort in Carterville. Enjoy free WiFi, free parking, and an outdoor pool. Our guests praise the helpful staff and the clean rooms ...
9.2/10 Wonderful! (270 reviews)
"We enjoy staying here occasionally to see a concert or gamble for fun. It’s convenient having entertainment and then being able to just go upstairs to bed. Out bathroom this stay wasn’t fully clean. There was long black hair all over the shower walls, the toilet lid was dirty, and the washcloths ..."

Reviewed on Jan 19, 2025

Walker's Bluff Casino Resort
La Quinta Inn & Suites by Wyndham Pontoon Beach
La Quinta Inn & Suites by Wyndham Pontoon Beach
2.5 out of 5
14 Regency Park Dr, Granite City, IL
The price is $85 per night from Feb 9 to Feb 10
$85
includes taxes & fees
Feb 9 - Feb 10
Book a stay at this business-friendly hotel in Granite City. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the clean ...
7.6/10 Good! (419 reviews)
Not too bad!
"The staff was friendly--had fun in the pool, breakfast was nice--housekeeping was a little hard to communicate with---not the cleanest--but, the room was pretty comfortable. The elevator was a little rough and smelled horribly, but it got the job done! Not horrible for the price!"

Reviewed on Jan 5, 2025

La Quinta Inn & Suites by Wyndham Pontoon Beach
Baymont by Wyndham Marion
Baymont by Wyndham Marion
2.5 out of 5
2608 W Main St, Marion, IL
The price is $83 per night from Feb 2 to Feb 3
$83
includes taxes & fees
Feb 2 - Feb 3
Book a stay at this business-friendly hotel in Marion. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the clean rooms ...
8.2/10 Very Good! (1,006 reviews)
"Nice clean room. Perfect for business."

Reviewed on Jan 24, 2025

Baymont by Wyndham Marion
See all 650 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.