Cheap Air Choice One flights St. Louis (STL) to Chicago (ORD)

You’ll find cheap round-trip Air Choice One flights from STL to ORD by organizing your results from “Price (lowest to highest)” on Expedia. Or look for bargains for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Browse for one-way or return flights to Chicago in January or February. You could find a cheap fare with Air Choice One during these off-season months.

Start searching one to three months before your departure to score cheap fares on Air Choice One flights from Lambert-St. Louis Intl. Airport (STL) to O’Hare Intl. Airport (ORD). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic flights.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

To see if there’s a direct route from STL to ORD with Air Choice One or another carrier, check the “Nonstop” filter when browsing for flights.

Search Air Choice One’s earliest flights from STL to ORD by using our “Early Morning” and “Morning” filters. Not only will you get to where you’re going sooner, early departures also experience 20% fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Air Choice One flights from Lambert-St. Louis Intl. Airport (STL) to Chicago touch down at O’Hare Intl. Airport (ORD). This is the main gateway to this destination.

Changes are usually free within 24 hours of making your booking, but your airline may add a charge after that. For more information about modifying your reservation, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to change your plans without extra charges, apply the “Changes included” and “No cancel fee” filters when planning your trip.