Cheap Flights to Southwest Illinois , IL from CA $300

View CA $317 flight on Fri, Sep. 5, 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 $300 for one-way flights and CA $505 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed., Apr. 23 - Wed., May 7
YYZ
Pearson Intl.
STL
Lambert-St. Louis Intl.
CA $505 Roundtrip, found 6 days ago
CA $505
Roundtrip
found 6 days ago
Select Delta flight, departing Wed., Apr. 23 from Pearson Intl. to Lambert-St. Louis Intl., returning Wed., May 7, priced at CA $505 found 6 days ago
American Airlines
Wed., Apr. 30 - Wed., May 28
YYZ
Pearson Intl.
STL
Lambert-St. Louis Intl.
CA $548 Roundtrip, found 6 days ago
CA $548
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed., Apr. 30 from Pearson Intl. to Lambert-St. Louis Intl., returning Wed., May 28, priced at CA $548 found 6 days ago
United
Fri., Sep. 5 - Sun., Sep. 7
YYZ
Pearson Intl.
STL
Lambert-St. Louis Intl.
CA $564 Roundtrip, found 1 day ago
CA $564
Roundtrip
found 1 day ago
Select United flight, departing Fri., Sep. 5 from Pearson Intl. to Lambert-St. Louis Intl., returning Sun., Sep. 7, priced at CA $564 found 1 day ago
Air Canada
Thu., May 1 - Mon., May 5
YYZ
Pearson Intl.
STL
Lambert-St. Louis Intl.
CA $564 Roundtrip, found 1 day ago
CA $564
Roundtrip
found 1 day ago
Select Air Canada flight, departing Thu., May 1 from Pearson Intl. to Lambert-St. Louis Intl., returning Mon., May 5, priced at CA $564 found 1 day ago
WestJet
Tue., May 13 - Thu., May 15
YYZ
Pearson Intl.
STL
Lambert-St. Louis Intl.
CA $567 Roundtrip, found 13 hours ago
CA $567
Roundtrip
found 13 hours ago
Select WestJet flight, departing Tue., May 13 from Pearson Intl. to Lambert-St. Louis Intl., returning Thu., May 15, priced at CA $567 found 13 hours ago

Expedia.ca gives you the best tools to secure great deals on flights to Southwest 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 Southwest Illinois. Whatever your travel needs, you can always rely on Expedia.ca to help you find cheap flights to Southwest 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 Southwest 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 Southwest Illinois.

Looking to save even more? Get additional savings by bundling your Southwest 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 Southwest Illinois trip!

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 $505 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 $505 and reached a maximum price of CA $597. For one-way trips departing from Toronto (YYZ), the lowest amount paid during this time was only CA $300.
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 $505 and CA $597. 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.
Flights to Southwest Illinois information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
CA $492

Trending flights to Southwest Illinois

Prices were available within the past 7 days and start at CA $300 for one-way flights and CA $505 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Fri., May 9 - Wed., May 14
YWG
Winnipeg James Armstrong Richardson Intl.
STL
Lambert-St. Louis Intl.
CA $597 Roundtrip, found 1 day ago
CA $597
Roundtrip
found 1 day ago
Select Delta flight, departing Fri., May 9 from Winnipeg James Armstrong Richardson Intl. to Lambert-St. Louis Intl., returning Wed., May 14, priced at CA $597 found 1 day ago
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