Direct flights from St Louis to Seattle

Did you mean Flights from Seattle to St Louis?

St Louis

United States

STL

Lambert St Louis International Airport

Seattle

United States

SEA

Seattle Tacoma International Airport

Route: Nonstop service available
Distance: 1,705 miles
Marketing airlines: 7 airlines
Aircraft: 8 aircraft types
Dates: Oct 19, 2026 – Sep 29, 2027

Observed award fares

A sample of one-way prices for one traveler from Roame’s fare cache. Points, fees, and seats describe the same observation. Availability can change; confirm with the loyalty program before transferring points.

Lowest price in this limited sample: 15,000 points + $5.00 for STL → SEA, Economy, on 2026-11-08, booked with Alaska Atmos Rewards. This is an observed fare, not a guaranteed price or the lowest price across all dates and programs.

Departure window: 2026-10-23 – 2026-11-21.

STL → SEAEconomy
AS615
15,000 points+ $5.00
Departure
2026-11-08
Seats seen
9
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-21 17:32
STL → SEAEconomy
AS615
15,000 points+ $5.00
Departure
2026-11-12
Seats seen
9
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-21 04:36
STL → SEAEconomy
AS615
15,000 points+ $5.00
Departure
2026-11-15
Seats seen
7
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-21 09:52
STL → SEAEconomy
AS669
15,000 points+ $5.00
Departure
2026-11-20
Seats seen
7
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-22 18:36
STL → SEAEconomy
AS615
17,500 points+ $5.00
Departure
2026-11-01
Seats seen
9
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-21 22:23
STL → SEAEconomy
AS615
17,500 points+ $5.00
Departure
2026-11-08
Seats seen
9
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-23 01:27
STL → SEAEconomy
AS473
20,000 points+ $5.00
Departure
2026-10-23
Seats seen
1
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-22 23:45
STL → SEAEconomy
AS473
20,000 points+ $5.00
Departure
2026-10-28
Seats seen
9
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-22 09:30
STL → SEAEconomy
AS615
20,000 points+ $5.00
Departure
2026-11-04
Seats seen
9
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-21 16:14
STL → SEAEconomy
AS615
20,000 points+ $5.00
Departure
2026-11-10
Seats seen
9
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-22 15:14
STL → SEAEconomy
AS618
20,000 points+ $5.00
Departure
2026-11-20
Seats seen
3
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-22 18:36
STL → SEAEconomy
AS314
22,500 points+ $5.00
Departure
2026-10-28
Seats seen
8
Book with
Alaska Atmos Rewards
Observed (UTC)
2026-10-22 09:30

St Louis to Seattle route overview

Lambert St Louis International Airport (STL) serves St Louis; Seattle Tacoma International Airport (SEA) serves Seattle.

The airports are 1,705 miles apart by great-circle distance.

Roame's current schedule feed shows nonstop service from STL to SEA.

Marketing airlines listed in the current schedule, including codeshare sellers, are American Airlines (AA), Alaska Airlines (AS), Finnair (AY), Cathay Pacific (CX), Japan Airlines (JL), Qatar Airways (QR) and Southwest Airlines (WN). This list does not identify the operating airline for each flight; check the flight details before booking.

Published schedule dates span Oct 19, 2026 – Sep 29, 2027.

Marketing airlines on the St Louis to Seattle route

These are marketing airlines, including codeshare sellers. This list does not identify the operating airline for each flight; check the flight details before booking.

American Airlines (AA)Codeshare only
Finnair (AY)Codeshare only
Cathay Pacific (CX)Codeshare only
Japan Airlines (JL)Codeshare only
Qatar Airways (QR)Codeshare only

Airline alliance affiliations represented: Oneworld

Aircraft flying from STL to SEA

Frequently asked questions

Which airports serve the St Louis to Seattle route?

Lambert St Louis International Airport (STL) is the origin airport and Seattle Tacoma International Airport (SEA) is the destination airport.

How far is Seattle from St Louis?

STL and SEA are approximately 1,705 miles apart by great-circle distance.

Are there direct flights from STL to SEA?

Yes. Roame's current schedule feed shows nonstop service from STL to SEA.

Which airlines market flights from STL to SEA?

Which aircraft fly from STL to SEA?

Aircraft listed in the current schedule include 737, Boeing 737-900 / Boeing 737-900ER (739), Boeing 737-700 / Boeing 737-700ER (73G), Boeing 737-800 Winglets (73H), Boeing 737-900 Winglets (73J), Boeing 737 MAX 8 (7M8), 7S7 and JET.