Flights to Southern Illinois, Illinois from NT$9,213

View NT$4,607 flight on Sat, 2026/1/31Opens 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 NT$4,607 for one-way flights and NT$9,213 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Jan 21 - Mon, Feb 2
ONT
Ontario
STL
St. Louis
NT$9,213 Roundtrip, found 6 hours ago
NT$9,213
Roundtrip
found 6 hours ago
Select Delta flight, departing Wed, Jan 21 from Ontario to St. Louis, returning Mon, Feb 2, priced at NT$9,213 found 6 hours ago
American Airlines
Sat, Jan 31 - Sat, Feb 7
ONT
Ontario
STL
St. Louis
NT$11,790 Roundtrip, found 21 hours ago
NT$11,790
Roundtrip
found 21 hours ago
Select American Airlines flight, departing Sat, Jan 31 from Ontario to St. Louis, returning Sat, Feb 7, priced at NT$11,790 found 21 hours ago
United
Sat, Jan 31 - Sat, Feb 7
ONT
Ontario
STL
St. Louis
NT$11,797 Roundtrip, found 21 hours ago
NT$11,797
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Jan 31 from Ontario to St. Louis, returning Sat, Feb 7, priced at NT$11,797 found 21 hours ago
Cathay Pacific
Sun, Jan 25 - Sun, Feb 1
TPE
Taipei
STL
St. Louis
NT$28,267 Roundtrip, found 6 hours ago
NT$28,267
Roundtrip
found 6 hours ago
Select Cathay Pacific flight, departing Sun, Jan 25 from Taipei to St. Louis, returning Sun, Feb 1, priced at NT$28,267 found 6 hours ago
Air Canada
Thu, Feb 26 - Tue, May 12
TPE
Taipei
STL
St. Louis
NT$40,710 Roundtrip, found 2 days ago
NT$40,710
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Feb 26 from Taipei to St. Louis, returning Tue, May 12, priced at NT$40,710 found 2 days 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$9,213 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$9,213 and NT$40,710. Many lucky travelers scored one-way seats from Ontario (ONT) for just NT$4,607.
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$9,213 to NT$40,710 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
NT$9,213

Trending flights to Southern Illinois

Prices were available within the past 7 days and start at NT$4,607 for one-way flights and NT$9,213 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, Jan 26 - Thu, Feb 5
TPE
Taipei
STL
St. Louis
NT$27,216 Roundtrip, found 6 hours ago
NT$27,216
Roundtrip
found 6 hours ago
Select Delta flight, departing Mon, Jan 26 from Taipei to St. Louis, returning Thu, Feb 5, priced at NT$27,216 found 6 hours ago

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