A calm lake surrounded by trees and vegetation.

Cheap Flights to Southwest Illinois

View ₩261,100 flight on Tue, Oct 6, 2026Opens in a new window

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How much is the cheapest flight to Southwest Illinois?

Prices were available within the past 7 days and start at ₩261,100 for one-way flights and ₩522,200 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Delta
American Airlines
Southwest Airlines
Jeju Air

Frequently asked questions

How do I find cheap flights to Southwest Illinois that have flexible change policies?
By using our neat "No change fee" filter, that's how. Just enter your travel details, click "Search," then tick the checkbox directly underneath the "Flexible change policies" heading (top left-hand side of your screen). Expedia makes it a cinch to find flexible and affordable tickets to Southwest Illinois.
Which airlines fly to Southwest Illinois?
When you're ready to reserve your ticket to or near Southwest Illinois, these popular carriers are waiting to welcome you on board:
  • Southwest Airlines - 2,214 flights to or near Southwest Illinois each month, including 2,214 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • American Airlines - 971 flights to or near Southwest Illinois each month, including 789 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • Delta Air Lines - 728 flights to or near Southwest Illinois each month, including 650 flights to Lambert-St. Louis Intl. Airport (STL) per month.
How can I find cheap tickets to Southwest Illinois?
In the last seven days, ₩522,200 was the best price for a flight to Southwest Illinois. If you'd love to save even more, book in advance and be flexible with your travel dates. Search for your flight to Southwest Illinois, then see prices for similar time frames by clicking on the "flexible dates" link above.
How much is a flight to Southwest Illinois?
In the last seven days, round-trip tickets to Southwest Illinois sold for as little as ₩522,200 and reached a maximum price of ₩1,240,900. For one-way trips departing from Los Angeles (LAX), the lowest amount paid during this time was only ₩261,100.
What are the most popular airports to fly into in Southwest Illinois?
Choosing your airport comes down to factors including your airline, budget and where you plan to explore. These are your choices in Southwest Illinois:
  • Lambert-St. Louis Intl. Airport (STL) - 4,902 flights per month.
  • Evansville Regional Airport (EVV) - 277 flights per month.
When is the cheapest time to fly to Southwest Illinois?
Consider jetting off earlier in the week to book the best airfare to Southwest Illinois. Tuesday is usually the most affordable day to fly, with Monday right behind it. Saturday often has the most expensive ticket prices. This is because a lot of people choose to begin their trip on a weekend.
How much is a plane ticket to Southwest Illinois?
In the last seven days, plane tickets to Southwest Illinois ranged between ₩522,200 and ₩1,240,900. Prices depend on multiple things, particularly the time of departure, carrier, cabin class and when the fare is booked.
What months are the cheapest to book a flight to Southwest Illinois?
The most affordable month to score a terrific deal to Southwest Illinois is February, while the priciest month is December. Avoid this month if you're looking to save money.

Book with confidence

Searching for cheap flights to Southwest Illinois? No travel company presents more choices than Expedia if you're looking to compare flights to Southwest 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 Southwest Illinois.

Travel information

Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
₩522,200

Trending flights to Southwest Illinois

Prices were available within the past 7 days and start at ₩261,100 for one-way flights and ₩522,200 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Jeju Air

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