Flight Routes from St. Louis to Seattle Tacoma

Compare cheap outbound and return flights from St. Louis (STL) to Seattle-Tacoma (SEA) and find the best offer from numerous airlines and travel agencies.

Trip type
Cheapest roundtrip flight
from€444
Fastest outbound flight
Fastest inbound flight
Flight distance
2,748 km
Time difference

Cheap flight offers from St. Louis to Seattle

sorted by price and recency
filters
  1. –
    Alaska Airlines
    –
    STL–SEA
    non-stop flight
    Alaska Airlines
    –
    SEA–STL
    non-stop flight
    €448
  2. –
    American Airlines
    –
    STL–SEA
    1 stopover
    American Airlines
    –
    SEA–STL
    1 stopover
    €444
  3. –
    American Airlines
    –
    STL–SEA
    1 stopover
    American Airlines
    –
    SEA–STL
    1 stopover
    €617
  4. –
    United Airlines
    –
    STL–SEA
    1 stopover
    American Airlines
    –
    SEA–STL
    1 stopover
    €529
  5. –
    Alaska Airlines
    –
    STL–SEA
    non-stop flight
    Alaska Airlines
    –
    SEA–STL
    non-stop flight
    €3,032
  6. –
    Delta Air Lines
    –
    STL–SEA
    1 stopover
    Delta Air Lines
    –
    SEA–STL
    1 stopover
    €506

Flight schedule from St. Louis (STL) to Seattle-Tacoma (SEA)

Select a travel date in the flight schedule for the route from St. Louis (STL) to Seattle-Tacoma (SEA) and compare affordable flight deals.

offers
Active filtersnone
Matching outbound flightsSTL–SEA · 5 of 5
fromto
dep.arr.
durationstopovers
  1. November 1 – 7, 2026
  2. November 8 – 14, 2026
  3. November 15 – 21, 2026
    1. STLSEA
      nonstop
      1. Southwest Airlines
    2. STLSEA
      nonstop
      1. Alaska Airlines
    3. STLSEA
      nonstop
      1. Alaska Airlines
    4. STLSEA
      nonstop
      1. Alaska Airlines
    5. STLSEA
      nonstop
      1. Alaska Airlines

      Tips and tricks to help you find cheap flights from St. Louis to Seattle Tacoma

      Favorite airline: Alaska Airlines
      Alaska Airlines is the most popular airline for flights from St. Louis to Seattle-Tacoma.
      Alaska Airlines
      33 %
      Delta
      22 %
      Spirit Airlines
      14 %
      Stopover flights are the cheapest connection
      Direct flights on this route are $42.00 more expensive on average than flights with a stopover.
      non stop flight
      1 stop
      04h 20min
      16h 00min
      232 $US
      190 $US
      The favorite connection is non-stop
      Non-stop flights are especially popular on this route. 32 % of travelers will book a direct flight.
      Route
      bookings
      Direct flights
      04h 20min, from 232 $US
      32 %
      1 stopover Salt Lake City International Airport, UT
      07h 08min, from 210 $US
      28 %
      1 stopover Las Vegas - McCarran International Airport, NV
      07h 54min, from 307 $US
      20 %

      Important flight information

      Frequently Asked Questions (FAQ)

      How long is the flight from St. Louis to Seattle-Tacoma?
      The route from St. Louis to Seattle-Tacoma is served by connecting flights with one stop. These typically take around 9 hours 53 minutes, depending on the layover time and the connection chosen. If travel time matters to you, look especially for connections with a short layover.
      Are there nonstop flights from St. Louis to Seattle-Tacoma?
      No, there are currently no nonstop flights from St. Louis to Seattle-Tacoma. However, you can reach Seattle-Tacoma with a one-stop connecting flight. Allow extra travel time for the connection and pay close attention to the length of the layover.
      Which airlines fly from St. Louis to Seattle-Tacoma?
      Flights from St. Louis to Seattle-Tacoma are available with one stop, operated by, among others, Delta (via Detroit, Salt Lake City). When comparing options, look beyond the fare and consider the total travel time and the length of the layover.

      Discover more flights around St. Louis and Seattle-Tacoma

      Departure airport Airport St. Louis - Lambert International Airport (STL)
      Arrival airport Airport Seattle-Tacoma International Airport, WA (SEA)
      Destination country Flights to United States
      Departure airport - Destination country St. Louis - Lambert International Airport - United States
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      Alternative flights to Seattle-Tacoma
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