Cheap Flights to Southern Illinois , IL from CA $247

View CA $247 flight on Sat, Sep. 13, 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 CA $247 for one-way flights and CA $430 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Nov. 1 - Tue, Nov. 4
YYZ
Toronto
STL
St. Louis
CA $430 Roundtrip, found 5 hours ago
CA $430
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Sat, Nov. 1 from Toronto to St. Louis, returning Tue, Nov. 4, priced at CA $430 found 5 hours ago
United
Sat, Nov. 15 - Mon, Nov. 17
YYZ
Toronto
STL
St. Louis
CA $467 Roundtrip, found 5 days ago
CA $467
Roundtrip
found 5 days ago
Select United flight, departing Sat, Nov. 15 from Toronto to St. Louis, returning Mon, Nov. 17, priced at CA $467 found 5 days ago
Air Canada
Wed, Oct. 1 - Wed, Oct. 8
YYZ
Toronto
STL
St. Louis
CA $507 Roundtrip, found 22 hours ago
CA $507
Roundtrip
found 22 hours ago
Select Air Canada flight, departing Wed, Oct. 1 from Toronto to St. Louis, returning Wed, Oct. 8, priced at CA $507 found 22 hours ago
Delta
Fri, Sep. 26 - Sun, Sep. 28
YUL
Montreal
EVV
Evansville
CA $794 Roundtrip, found 1 day ago
CA $794
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Sep. 26 from Montreal to Evansville, returning Sun, Sep. 28, priced at CA $794 found 1 day ago
WestJet
Thu, Sep. 4 - Sun, Sep. 7
YQT
Thunder Bay
EVV
Evansville
CA $1,741 Roundtrip, found 15 hours ago
CA $1,741
Roundtrip
found 15 hours ago
Select WestJet flight, departing Thu, Sep. 4 from Thunder Bay to Evansville, returning Sun, Sep. 7, priced at CA $1,741 found 15 hours ago

Expedia.ca gives you the best tools to secure great deals on flights to Southern Illinois. Use our easy and convenient booking engine to browse nonstop flights and convenient departure points every day of the year. Search airfares from the top airlines to book your perfect flight to Southern Illinois. Whatever your travel needs, you can always rely on Expedia.ca to help you find cheap flights to Southern Illinois.

Using our booking engine is simple - just type in your points of travel and preferred dates and Expedia.ca does the rest! If your travel times are flexible, you can find even better bargains by adjusting your flight dates. Browse connecting flights to increase your chances of finding even lower fares. Thanks to Expedia's Best Price Guarantee, you can book your Southern Illinois flights with full confidence knowing that you've found the best deal online.

Expedia.ca makes the booking process easy and stress-free by offering support along the entire way. Our friendly staff is available 24 hours a day to provide assistance and help you book your ticket. Call us toll-free at 1-888-397-3342 to answer any questions that you may have about your trip to Southern Illinois.

Looking to save even more? Get additional savings by bundling your Southern Illinois flight with a hotel and/or car rental to create a bargain travel package. Early birds can discover terrific savings by booking in advance while last minute travelers can enjoy great last minute deals. With Expedia.ca, there's no shortage of options to save even more on your Southern Illinois trip!

Frequently asked questions

How do I find cheap flights to Southern Illinois that have flexible change policies?
We get that travel arrangements can change in a flash, so reserving a flexible ticket with Expedia makes sense. Simply mark the "No change fee" box under the "Flexible change policies" filter. Your low-cost, flexible flight to Southern Illinois is just a few clicks away.
Which airlines fly to Southern Illinois?
With a good range of airlines offering flights into or near Southern Illinois, you won't be short of options:

  • Southwest Airlines - 2,907 flights to or near Southern Illinois each month, including 2,907 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • American Airlines - 1,023 flights to or near Southern Illinois each month, including 810 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • Delta - 602 flights to or near Southern Illinois each month, including 516 flights to Lambert-St. Louis Intl. Airport (STL) per month.

How can I find cheap tickets to Southern Illinois?
A helpful strategy for getting your hands on cheap tickets is to be flexible with your dates. Start by searching for your flight to Southern Illinois, then click on the "flexible dates" link for a list of prices for nearby days. Another helpful hint? Book well ahead of time. For an idea of fares, CA $430 was the best price for a flight to Southern Illinois in the last seven days.
How much is a flight to Southern Illinois?
You could have picked up a round-trip flight to Southern Illinois from anywhere between CA $430 and CA $1,741 in the last seven days. For one-way trips leaving from Toronto (YYZ), the lowest price during this period was just CA $247.
What are the most popular airports to fly into in Southern Illinois?
Land at any one of these major airports in Southern Illinois and you'll be perfectly placed to experience all that this renowned region has to offer:

  • Lambert-St. Louis Intl. Airport (STL) - 5,094 flights per month.
  • Evansville Regional Airport (EVV) - 325 flights per month.
  • Williamson County Regional Airport (MWA) - 52 flights per month.

When is the cheapest time to fly to Southern Illinois?
Consider jetting off early in the week to land a bargain airfare to Southern Illinois. Tuesday is usually the most cost-effective day to depart, with Monday running a close second. Saturday typically has the highest prices. This is because lots of travellers prefer to begin their break on a weekend.
How much is a plane ticket to Southern Illinois?
In the last seven days, tickets to Southern Illinois fluctuated from CA $430 to CA $1,741.
What are the best things to do in Southern Illinois?

  • Get your vacation underway in the premier city of Alton and you'll have a seemingly endless list of attractions to enjoy. Argosy Casino is just the tip of the sightseeing iceberg. You'll want to soak up the buzzing nightlife, taste the local cuisine and shop up a storm while you're in town as well.
  • If you're not sure what to pack beyond your credit card, passport and cellphone, check the local forecast. This will help you choose your travel wardrobe for the time of year you're staying in Alton, which has a humid subtropical climate.

What is the best time to go to Southern Illinois?
If you like the lively energy of major cities, go to Belleville during April, May and June. This is a very popular time for one of Southern Illinois's much-loved destinations. Summer begins June 20 and brings average temperatures of between 19ºC and 29ºC. Time your getaway then and look forward to plenty of glorious sunny days.
What months are the cheapest to book a flight to Southern Illinois?
The most cost-effective month to land a great deal to Southern Illinois is February, whereas prices are at their highest in December. Try to avoid this month if you're watching your pennies.
Flights to Southern Illinois information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
CA $506

Trending flights to Southern Illinois

Prices were available within the past 7 days and start at CA $247 for one-way flights and CA $430 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Nov. 1 - Tue, Nov. 4
YYZ
Toronto
STL
St. Louis
CA $430 Roundtrip, found 5 hours ago
CA $430
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Sat, Nov. 1 from Toronto to St. Louis, returning Tue, Nov. 4, priced at CA $430 found 5 hours ago
*Available to Expedia members.