$104 Cheap American Airlines flights St. Louis (STL) to Boston (BOS)

Set the “Price (lowest to highest)” filter on Expedia to find cheap American Airlines round-trip flights from $196 from STL to BOS. Affordable one-way fares from $104 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 Boston are often cheaper in the low-season months of January and February. Whether you’re after a one-way or round-trip ticket, you could score a better deal then.

Begin your search one to three months ahead of your travel date to find cheap fares on American Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS). 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 cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing spot on, 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.

Jet off on one of American Airlines’s 10 direct weekly flights from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS). To see what’s available, enter your dates, origin and destination and hit search. Then apply the “Nonstop” and “Airline” filters.

From wheels-up to touchdown, a nonstop American Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS) typically takes 2h 40m.

If flexibility is what you’re after, Tuesday offers the most choice for American Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS). Take your pick of 2 different departures.

The first flight from STL to BOS with American Airlines leaves at 9:25AM UTC-6. You’ll land at 1:05PM UTC-5. The last American Airlines flight of the day leaves at 1:30PM UTC-6 and arrives at 5:10PM UTC-5. With 20% fewer cancellations for early and mid-morning departures, starting your travel day early is typically 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.

Logan Intl. Airport (BOS) is the primary Boston hub for American Airlines flights from Lambert-St. Louis Intl. Airport (STL).

Take an American Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS), and you’ll probably board an Embraer 175. Bear in mind though, that the aircraft type can change depending on operational needs.

Changes are often free within 24 hours of booking, but your airline may add a charge after that time. For more information about altering your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to update your itinerary without additional costs, apply the “No cancel fee” or “Changes included” filter when organizing your next break.