$95 Cheap American Airlines flights St. Louis (STL) to Seattle (SEA)

Scoring cheap one-way American Airlines flights from STL to SEA from $95 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Or check out our affordable return fares from $189 for your next exciting getaway.**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.

January is one of the cheapest months to fly to Seattle with American Airlines. You could also find great deals on one-way and round-trip tickets in February.

For cheap American Airlines fares from Lambert-St. Louis Intl. Airport (STL) to Seattle - Tacoma Intl. Airport (SEA), start searching one to three months before your planned departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact how much you pay. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight on a Sunday.**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.

Click on the “Nonstop” filter when looking for direct American Airlines flights from STL to SEA. It’s also an easy way to compare other airlines offering the same direct trip.

Find American Airlines’s earliest flights from STL to SEA by selecting the “Morning” and “Early Morning” filters. Not only will you get to where you’re going sooner, early departures are also 20% less likely to be canceled.**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.

Seattle - Tacoma Intl. Airport (SEA) is the primary Seattle hub for American Airlines flights from Lambert-St. Louis Intl. Airport (STL).

Depending on the type of ticket you purchased, a fee typically applies if you change or cancel your flight more than 24 hours after confirmation. To find plane tickets with more flexibility, select our “Changes included” or “No cancel fee” filter when searching for flights. To learn more about canceling or modifying your reservation, visit “Trips,” select your flight and click on “Manage Booking.”