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Fly from
Fly to
Route
Depart
Return
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Wed 24/2
13:45-23:18
1 stop7h 33m
Lambert-St Louis
Sun 28/2
6:30-10:55
1 stop6h 25m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Wed 21/10
15:30-23:15
1 stop5h 45m
Lambert-St Louis
Tue 27/10
5:20-13:35
2 stops10h 15m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 5/11
11:20-0:55
2 stops11h 35m
Lambert-St Louis
Thu 12/11
21:45-8:25
1 stop12h 40m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Mon 16/11
9:25-17:41
1 stop6h 16m
Lambert-St Louis
Thu 19/11
12:28-17:10
1 stop6h 42m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Wed 21/10
12:05-22:10
2 stops8h 05m
Lambert-St Louis
Tue 27/10
5:20-13:35
2 stops10h 15m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Tue 20/10
0:10-9:15
1 stop7h 05m
Lambert-St Louis
Wed 28/10
14:35-19:05
1 stop6h 30m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Wed 21/10
12:05-22:10
2 stops8h 05m
Lambert-St Louis
Mon 26/10
18:10-0:40
1 stop8h 30m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Tue 20/10
15:30-23:15
1 stop5h 45m
Lambert-St Louis
Sat 24/10
8:25-20:30
1 stop14h 05m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Sun 1/11
5:30-13:32
1 stop6h 02m
Lambert-St Louis
Wed 4/11
6:21-12:30
1 stop8h 09m
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Tue 3/11
16:40-9:35
2 stops14h 55m
Lambert-St Louis
Tue 10/11
16:40-23:35
1 stop8h 55m
See travel insights to St. Louis from
How to get the cheapest flight ticket from Seattle to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Seattle and St. Louis?
Prices are currently low for flights on this route.
Typical prices usually range from R4 789 to R8 713.The lowest price recently found on this route was R3 691.
What is the cheapest month to fly to St. Louis?
In general, January is the cheapest month to fly from Seattle to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around R3 941. If you aren’t able to travel to St. Louis during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of R4 772.
How far in advance should I book a flight from Seattle to St. Louis?
You are more likely to see cheaper flights to St. Louis from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around R7 169 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Seattle for as low as R4 390 on momondo.
How many flights depart from Seattle to St. Louis on average per day?
The number of flights available between Seattle and St. Louis is 4 per day as of October 2026. The most frequent departure time is 18:00, with 69% of daily flights leaving in the evening.
How many flights depart from Seattle to St. Louis on average per week?
28 flights are operational weekly from Seattle to St. Louis as of October 2026. The most popular departure day for this route is Wed, with 29% of flights per week taking off on this day.
When to book flights from Seattle to St. Louis
Cheap Seattle to St. Louis (SEA to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to St. Louis
Frequently asked questions about flying from Seattle to St. Louis
How far is Seattle/Tacoma Intl to Lambert-St Louis by plane?
The straight-line distance from Seattle/Tacoma Intl to Lambert-St Louis is 2767,4 km.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport are refreshed on a daily basis.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to St. Louis?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Seattle to St. Louis is Boeing 737 (45,04% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (17,02%), Boeing 737-800 Passenger/BBJ2 (winglets) (15,25%), and Boeing 737 MAX 9 (7,45%).
Why use momondo?
Why should I use momondo to find a flight deal from Seattle to St. Louis?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to St. Louis . Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Seattle to St. Louis with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Seattle to St. Louis flights to just show those with flexible booking policies.
How can momondo help me find flights from Seattle to St. Louis?
momondo provides multiple filters to help you find the best flight to St. Louis from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Seattle to St. Louis right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Seattle to St. Louis flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.