Flights to Southern Illinois, Illinois from NT$19,670

View NT$10,155 flight on Mon, 2026/6/29Opens in a new window

Popular airlines

  • Contour Airlines

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 45% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

How much is the cheapest flight to Southern Illinois?

Prices were available within the past 7 days and start at NT$10,155 for one-way flights and NT$19,670 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Jul 21 - Fri, Aug 7
BIL
Billings
CGI
Cape Girardeau
NT$19,670 Roundtrip, found 1 day ago
NT$19,670
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jul 21 from Billings to Cape Girardeau, returning Fri, Aug 7, priced at NT$19,670 found 1 day ago
United
Wed, Jul 1 - Fri, Jul 10
BIL
Billings
CGI
Cape Girardeau
NT$19,923 Roundtrip, found 1 day ago
NT$19,923
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jul 1 from Billings to Cape Girardeau, returning Fri, Jul 10, priced at NT$19,923 found 1 day ago
United
Wed, Jul 22 - Fri, Aug 7
BIL
Billings
CGI
Cape Girardeau
NT$20,618 Roundtrip, found 1 day ago
NT$20,618
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jul 22 from Billings to Cape Girardeau, returning Fri, Aug 7, priced at NT$20,618 found 1 day ago
United
Wed, Jul 29 - Mon, Aug 17
BIL
Billings
CGI
Cape Girardeau
NT$20,682 Roundtrip, found 1 day ago
NT$20,682
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jul 29 from Billings to Cape Girardeau, returning Mon, Aug 17, priced at NT$20,682 found 1 day ago
American Airlines
Thu, May 28 - Thu, Jun 4
CMH
Columbus
CGI
Cape Girardeau
NT$26,285 Roundtrip, found 1 day ago
NT$26,285
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, May 28 from Columbus to Cape Girardeau, returning Thu, Jun 4, priced at NT$26,285 found 1 day ago

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. NT$19,670 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 NT$19,670 and NT$26,285. Many lucky travelers scored one-way seats from Billings (BIL) for just NT$10,155.
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 NT$19,670 to NT$26,285 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.

Travel information

Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
NT$11,717

Explore a world of travel with Expedia

*Available to Expedia members.