St Louis to Seattle Flights STL → SEA

St. Louis Lambert International Airport → Seattle–Tacoma International Airport

🇺🇸 St Louis, US → 🇺🇸 Seattle, US

The St Louis to Seattle route connects St. Louis Lambert International Airport (STL) in US with Seattle–Tacoma International Airport (SEA) in US. This medium-haul flight covers approximately 2275 miles (3661 km). This route is served by 2 airlines: Southwest, Alaska Airlines.

Airport Information

Departure Airport

St. Louis Lambert International Airport

ICAO Code:: KSTL
IATA Code:: STL
City:: 🇺🇸 St Louis
Country:: US
Elevation:: 618 ft

Destination Airport

Seattle–Tacoma International Airport

ICAO Code:: KSEA
IATA Code:: SEA
City:: 🇺🇸 Seattle
Country:: US
Elevation:: 433 ft

Route Statistics

Operators

Routes Tracked

2275

Miles

Flight Duration

Route Map

Operating Airlines

Airline	ICAO	IATA
Southwest	`SWA`	`WN`
Alaska Airlines	`ASA`	`AS`

Flight Schedule Pattern

Day	Flights Observed	Frequency
Monday	0	0%
Tuesday	1	33%
Wednesday	0	0%
Thursday	2	67%
Friday	0	0%
Saturday	0	0%
Sunday	0	0%

Pattern Analysis

Data Points: 3
API observations used to build this analysis

Weekdays: 3 flights
Weekend: 0 flights

All Flight Routes

2 Routes

Note: This table shows aggregated route data by airline. Each airline may operate multiple daily flights at different times. See the "Spotted Departure Times" section below for all observed departure times.

Airline	Flight Numbers	Aircraft Type	Typical Time	Days Active	Last Seen	Status
Alaska Airlines `ASA` / `AS`	-	B39M	-	M T W T F S S	Jul 17, 2025	Active
Southwest `SWA` / `WN`	-	B739	-	M T W T F S S	Nov 18, 2025	Active

Total Routes: 2

Active Routes: 2

Unique Airlines: 2

Aircraft Types: 2