Cheap Flights to Southwest Illinois , IL from CA $227

View CA $261 flight on Thu, May 15, 2025Opens 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 CA $227 for one-way flights and CA $373 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu., May 22 - Tue., May 27
YYZ
Toronto
STL
St. Louis
CA $483 Roundtrip, just found
CA $483
Roundtrip
just found
Select United flight, departing Thu., May 22 from Toronto to St. Louis, returning Tue., May 27, priced at CA $483 just found
Delta
Thu., May 22 - Tue., May 27
YYZ
Toronto
STL
St. Louis
CA $485 Roundtrip, just found
CA $485
Roundtrip
just found
Select Delta flight, departing Thu., May 22 from Toronto to St. Louis, returning Tue., May 27, priced at CA $485 just found
American Airlines
Thu., May 22 - Tue., May 27
YYZ
Toronto
STL
St. Louis
CA $496 Roundtrip, just found
CA $496
Roundtrip
just found
Select American Airlines flight, departing Thu., May 22 from Toronto to St. Louis, returning Tue., May 27, priced at CA $496 just found
American Airlines
Wed., Jun. 25 - Wed., Jul. 9
YUL
Montreal
STL
St. Louis
CA $498 Roundtrip, found 2 hours ago
CA $498
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Wed., Jun. 25 from Montreal to St. Louis, returning Wed., Jul. 9, priced at CA $498 found 2 hours ago
Air Canada
Thu., May 22 - Tue., May 27
YYZ
Toronto
STL
St. Louis
CA $519 Roundtrip, just found
CA $519
Roundtrip
just found
Select Air Canada flight, departing Thu., May 22 from Toronto to St. Louis, returning Tue., May 27, priced at CA $519 just found

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, CA $373 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 CA $373 and reached a maximum price of CA $519. For one-way trips departing from Toronto (YYZ), the lowest amount paid during this time was only CA $227.
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 CA $373 and CA $519. 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.

Trending flights to Southwest Illinois

Prices were available within the past 7 days and start at CA $227 for one-way flights and CA $373 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue., May 6 - Tue., May 6
YYC
Calgary
STL
St. Louis
CA $373 Roundtrip, found 18 hours ago
CA $373
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Tue., May 6 from Calgary to St. Louis, returning Tue., May 6, priced at CA $373 found 18 hours ago
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