Cheap Flights to Southern Illinois

View ₩226,500 flight on Tue, Oct 7, 2025Opens in a new window

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How much is the cheapest flight to Southern Illinois?

Prices were available within the past 7 days and start at ₩226,500 for one-way flights and ₩473,600 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Oct 4 - Wed, Oct 8
LAS
Las Vegas
STL
St. Louis
₩473,600 Roundtrip, found 4 days ago
₩473,600
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Oct 4 from Las Vegas to St. Louis, returning Wed, Oct 8, priced at ₩473,600 found 4 days ago
United
Sat, Oct 4 - Wed, Oct 8
LAS
Las Vegas
STL
St. Louis
₩536,500 Roundtrip, found 4 days ago
₩536,500
Roundtrip
found 4 days ago
Select United flight, departing Sat, Oct 4 from Las Vegas to St. Louis, returning Wed, Oct 8, priced at ₩536,500 found 4 days ago
American Airlines
Sat, Oct 4 - Wed, Oct 8
LAS
Las Vegas
STL
St. Louis
₩579,200 Roundtrip, found 4 days ago
₩579,200
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Oct 4 from Las Vegas to St. Louis, returning Wed, Oct 8, priced at ₩579,200 found 4 days ago
Korean Air
Tue, Dec 23 - Mon, Feb 16
ICN
Seoul
STL
St. Louis
₩983,200 Roundtrip, found 1 day ago
₩983,200
Roundtrip
found 1 day ago
Select Korean Air flight, departing Tue, Dec 23 from Seoul to St. Louis, returning Mon, Feb 16, priced at ₩983,200 found 1 day ago
Alaska Airlines
Sat, Oct 18 - Sat, Oct 25
ICN
Seoul
STL
St. Louis
₩1,118,300 Roundtrip, found 2 days ago
₩1,118,300
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Oct 18 from Seoul to St. Louis, returning Sat, Oct 25, priced at ₩1,118,300 found 2 days ago

Searching for cheap flights to Southern Illinois? No travel company presents more choices than Expedia if you're looking to compare flights to Southern Illinois. With more airlines, cheaper flights, fewer stops, and more departure and arrival times travellers should ensure they search on Expedia before any holiday to Illinois. Expedia provides the cheapest flights to many destinations in Illinois and you may find even greater savings if you combine your flight with a hotel stay in Southern Illinois.

Frequently asked questions

How do I find cheap flights to Southern Illinois that have flexible change policies?
When it comes to flying these days, flexibility is key. That's why we have a "No change fee" search function to help you find flexible, low-priced tickets to Southern Illinois. It's on the left of your screen underneath the "Flexible change policies" heading.
Which airlines fly to Southern Illinois?
Work out your travel dates and then fly into or near Southern Illinois with one of these well-known airlines:

  • Southwest Airlines - 2,214 flights to or near Southern Illinois each month, including 2,214 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • American Airlines - 971 flights to or near Southern Illinois each month, including 789 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • Delta Air Lines - 728 flights to or near Southern Illinois each month, including 650 flights to Lambert-St. Louis Intl. Airport (STL) per month.

How can I find cheap tickets to Southern Illinois?
You'll always nab a fabulous deal with Expedia, but our "flexible dates" search function makes it that much easier. Enter your preferred travel date, then click on the flexible dates link above to see a list of prices for nearby days. ₩473,600 was the best price for a flight to Southern Illinois in the last seven days.
How much is a flight to Southern Illinois?
There were a lot of low-cost fares for the taking in the last seven days, with the price of a return ticket to Southern Illinois varying between ₩473,600 and ₩1,317,000. Many lucky travelers scored one-way seats from Las Vegas (LAS) for just ₩226,500.
What are the most popular airports to fly into in Southern Illinois?
Jet off to Southern Illinois and you'll have a few airports to decide between. Here are some of the region's busiest:

  • Lambert-St. Louis Intl. Airport (STL) - 4,902 flights per month.
  • Evansville Regional Airport (EVV) - 277 flights per month.
  • Williamson County Regional Airport (MWA) - 156 flights per month.

When is the cheapest time to fly to Southern Illinois?
If you'd prefer to spend your cash experiencing Southern Illinois rather than on your flight there, leave earlier in the week. The cheapest day to travel is normally Tuesday, with Monday a close second. With many folks traveling on the weekend, Saturday typically has the highest ticket prices.
How much is a plane ticket to Southern Illinois?
Airfares varied from ₩473,600 to ₩1,317,000 over the last seven days. When you're ready to book, we're here to help you pick up the best price to Southern Illinois.
What months are the cheapest to book a flight to Southern Illinois?
To pick up an awesome deal to Southern Illinois, book during February when prices are at their cheapest. The most expensive time to book? In the U.S, it's the festive month of December.
Flights to Southern Illinois information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
₩473,600

Trending flights to Southern Illinois

Prices were available within the past 7 days and start at ₩226,500 for one-way flights and ₩473,600 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Oct 16 - Sat, Oct 18
ICN
Seoul
STL
St. Louis
₩849,500 Roundtrip, found 3 days ago
₩849,500
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Oct 16 from Seoul to St. Louis, returning Sat, Oct 18, priced at ₩849,500 found 3 days ago
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