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

Find The Best Day To Fly from Seattle to St. Louis

Amazing American Airlines SEA to STL Flight Deals

The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were $189 round trip and $95 one way. Prices and availability subject to change. Additional terms may apply.

Thu, Oct 2 - Sat, Oct 4
SEA
Seattle
STL
St. Louis
$189 Roundtrip, found 3 hours ago
$189
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Thu, Oct 2 from Seattle to St. Louis, returning Sat, Oct 4, priced at $189 found 3 hours ago
Thu, Oct 2 - Sat, Oct 4
SEA
Seattle
STL
St. Louis
$206 Roundtrip, found 3 hours ago
$206
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Thu, Oct 2 from Seattle to St. Louis, returning Sat, Oct 4, priced at $206 found 3 hours ago
Thu, Oct 2 - Sun, Oct 5
SEA
Seattle
STL
St. Louis
$213 Roundtrip, just found
$213
Roundtrip
just found
Select American Airlines flight, departing Thu, Oct 2 from Seattle to St. Louis, returning Sun, Oct 5, priced at $213 just found
Tue, Mar 3 - Tue, Mar 10
SEA
Seattle
STL
St. Louis
$221 Roundtrip, found 23 hours ago
$221
Roundtrip
found 23 hours ago
Select American Airlines flight, departing Tue, Mar 3 from Seattle to St. Louis, returning Tue, Mar 10, priced at $221 found 23 hours ago
Thu, Oct 2 - Sat, Oct 4
SEA
Seattle
STL
St. Louis
$230 Roundtrip, found 3 hours ago
$230
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Thu, Oct 2 from Seattle to St. Louis, returning Sat, Oct 4, priced at $230 found 3 hours ago
Thu, Oct 2 - Sun, Oct 5
SEA
Seattle
STL
St. Louis
$237 Roundtrip, just found
$237
Roundtrip
just found
Select American Airlines flight, departing Thu, Oct 2 from Seattle to St. Louis, returning Sun, Oct 5, priced at $237 just found

Frequently asked questions

Can I catch a flight from Seattle - Tacoma Intl. Airport (SEA) to St. Louis Lambert International Airport right now?
For info on any current STL travel advice and quarantine requirements, go to the Covid-19 Travel Advisor. Check before you book your flight, so you don't get caught out en route.
What terminal is American Airlines at Sea-Tac Airport?
If you're traveling from Seattle - Tacoma Intl. Airport (SEA) to STL, you'll probably be exiting the plane at terminal 1. We can't say for certain which terminal you'll be setting off from --- it's a good idea to ask your airline.
Are there American Airlines non-stop flights from SEA to STL?
There aren't any nonstop flights with American Airlines from Seattle - Tacoma Intl. Airport (SEA) to St. Louis Lambert International Airport. You will have at least one stopover, so make the most of this time to wander around and stretch those legs before catching your next flight.
How long is an American Airlines flight from SEA to STL?
Watch a movie or two, listen to music through your headphones or just put your seat back and take it easy. Whatever interests you, find a way to amuse yourself during the 5 hours and 44 minutes that it takes to venture from SEA to STL with American Airlines.
What type of aircraft does American Airlines fly from SEA to STL?
If you're traveling from SEA to STL with American Airlines, there's a good chance you'll be cruising the skies aboard the Boeing 737-900 or the Boeing 737-900.
How many direct and indirect flights does American Airlines fly from SEA to STL?
If you're traveling from SEA to STL, you'll discover about 5 American Airlines daily flights to choose from.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Lambert Field, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.
American Airlines Airports
Hop on a(n) American Airlines flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
DFWUSADallas-Fort Worth Intl.599
CLTUSACharlotte-Douglas Intl.536
ORDUSAO'Hare Intl.317
PHLUSAPhiladelphia Intl.247
MIAUSAMiami Intl.193
DCAUSARonald Reagan Washington National152
PHXUSASky Harbor Intl.141
LAXUSALos Angeles Intl.81
LGAUSALaGuardia72
BOSUSALogan Intl.57

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Pear Tree Inn St. Louis Airport

2.5 out of 5
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Wingate by Wyndham St. Louis Airport

Wingate by Wyndham St. Louis Airport

2.5 out of 5
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This hotel features an outdoor pool and a 24-hour gym. Traveling on business? Take advantage of the business center, free WiFi in public areas, and free airport ...
9.2/10 Wonderful! (1,333 reviews)
"The whole process was smooth checking in and out. the staff were all great. Bedroom was clean"

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DoubleTree by Hilton St. Louis Airport

DoubleTree by Hilton St. Louis Airport

4 out of 5
4505 Woodson Road, St. Louis, MO
This hotel features an outdoor pool, a 24-hour gym, and a restaurant. Bring the family and enjoy the arcade/game room and kid-friendly dining. Unwind with a ...
7.8/10 Good! (768 reviews)
"Clean and the staff was wonderful"

Reviewed on Jul 10, 2025

DoubleTree by Hilton St. Louis Airport
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.