$109 Cheap American Airlines flights St. Louis (STL) to Chicago (ORD)

Apply the “Price (lowest to highest)” filter on Expedia to look for cheap American Airlines round-trip flights from $138 from STL to ORD. Affordable one-way options from $109 are also on offer.**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.

American Airlines flights to Chicago are often more affordable in the quieter months of January and February. Whether you need a one-way or a return ticket, you could score a better deal then.

Search for affordable American Airlines flights from Lambert-St. Louis Intl. Airport (STL) to O’Hare Intl. Airport (ORD) one to three months before your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the best day of the week to book a domestic flight is generally Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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.

American Airlines offers direct flights from Lambert-St. Louis Intl. Airport (STL) to O’Hare Intl. Airport (ORD), with 28 weekly departures. Just apply the “Nonstop” and “Airline” filters while searching on Expedia to find all direct American Airlines flights to ORD.

It takes approximately 1h 26m to fly nonstop from Lambert-St. Louis Intl. Airport (STL) to O’Hare Intl. Airport (ORD) with American Airlines.

Saturday has the most American Airlines flights from Lambert-St. Louis Intl. Airport (STL) to O’Hare Intl. Airport (ORD). With 4 daily departures, this is the best day to find something that will fit your plans.

The first flight from STL to ORD with American Airlines leaves at 5:40AM UTC-6. You’ll land at 7:08AM UTC-6. The final American Airlines flight of the day leaves at 6:00PM UTC-6 and arrives at 7:29PM UTC-6. With approximately 20% fewer cancellations for early and mid-morning departures, beginning your travel day early is often the best way to go.**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.

O’Hare Intl. Airport (ORD) is the main arrival point for American Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Chicago. But the airline also flies to Midway Intl. Airport (MDW). Make sure you select the “All Airports” option for your destination to see exactly what’s available for your trip to Chicago.

American Airlines typically uses Embraer 170 planes for flights from Lambert-St. Louis Intl. Airport (STL) to O’Hare Intl. Airport (ORD). This airline also operates the Embraer 175 on this route. Remember that aircraft type can change depending on operational needs, so the plane you catch could be different on the day.

Changes are often free within 24 hours of making a booking, but your airline may add a charge after that time. For more details about altering your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you want the freedom to adjust your plans without extra charges, tick the “Changes included” or “No cancel fee” filter when planning your next break.