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St. Louis Lambert International Airport to Seattle-Tacoma International Airport flight

Explore the cheapest one-way and round-trip flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport over the next 90 days, with one-way fares from KRW 140,300 and round-trip from KRW 214,900. Based on Trip.com's latest 7-day flight data.

    • Cheapest
      STL 6:32 AM
      10h 31m
      1 stop
      SEA 3:03 PM
      St. Louis - Seattle | Wed, Dec 2 | Delta Air Lines
      KRW 140,300 KRW 218,300
      36% off
      36% off
      KRW 218,300 KRW 140,300
    • STL 7:08 AM
      9h 35m
      1 stop
      SEA 2:43 PM
      St. Louis - Seattle | Tue, Dec 15 | Delta Air Lines
      KRW 140,700 KRW 218,300
      36% off
      36% off
      KRW 218,300 KRW 140,700
    • STL 7:46 PM
      6h 24m
      1 stop
      SEA 12:10 AM
      St. Louis - Seattle | Mon, Dec 21 | Delta Air Lines
      KRW 140,900 KRW 218,300
      35% off
      35% off
      KRW 218,300 KRW 140,900
    • STL 10:14 AM
      10h 29m
      1 stop
      SEA 6:43 PM
      St. Louis - Seattle | Wed, Dec 16 | Delta Air Lines
      KRW 141,100
      35% off
      KRW 218,300 KRW 141,100
    • STL 5:00 PM
      7h 52m
      1 stop
      SEA 10:52 PM
      St. Louis - Seattle | Sat, Dec 12 | Delta Air Lines
      KRW 141,300
      35% off
      KRW 218,300 KRW 141,300
    • STL 7:08 AM
      9h 35m
      1 stop
      SEA 2:43 PM
      St. Louis - Seattle | Tue, Dec 8 | Delta Air Lines
      KRW 141,300
      35% off
      KRW 218,300 KRW 141,300
    • STL 12:31 PM
      6h 39m
      1 stop
      SEA 5:10 PM
      St. Louis - Seattle | Wed, Dec 9 | Delta Air Lines
      KRW 141,300
      35% off
      KRW 218,300 KRW 141,300
    • STL 2:17 PM
      9h 47m
      1 stop
      SEA 10:04 PM
      St. Louis - Seattle | Fri, Dec 11 | Delta Air Lines
      KRW 144,500
      34% off
      KRW 218,300 KRW 144,500
    • STL 10:25 AM
      8h 31m
      1 stop
      SEA 4:56 PM
      St. Louis - Seattle | Tue, Dec 15 | American Airlines
      KRW 146,200
      33% off
      KRW 218,300 KRW 146,200
    • STL 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      St. Louis - Seattle | Fri, Nov 6 | Normal Airline
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    • Cheapest nonstop
      STL 6:00 AM
      4h 36m
      Nonstop
      SEA 8:36 AM
      St. Louis - Seattle | Sun, Nov 8 | Alaska Airlines
      SEA 6:07 PM
      3h 52m
      Nonstop
      STL 11:59 PM
      Seattle - St. Louis | Mon, Nov 16 | Alaska Airlines
      KRW 268,700 KRW 362,300
      26% off
      26% off
      KRW 362,300 KRW 268,700
    • STL 6:00 AM
      4h 36m
      Nonstop
      SEA 8:36 AM
      St. Louis - Seattle | Thu, Nov 5 | Alaska Airlines
      SEA 6:07 PM
      3h 52m
      Nonstop
      STL 11:59 PM
      Seattle - St. Louis | Thu, Nov 12 | Alaska Airlines
      KRW 315,200 KRW 362,300
      13% off
      13% off
      KRW 362,300 KRW 315,200
    • STL 6:00 AM
      9h 15m
      1 stop
      SEA 1:15 PM
      St. Louis - Seattle | Sat, Nov 14 | American Airlines
      SEA 11:34 PM
      9h 18m
      1 stop
      STL 10:52 AM
      Seattle - St. Louis | Sat, Nov 14 | American Airlines
      KRW 214,900 KRW 362,300
      41% off
      41% off
      KRW 362,300 KRW 214,900
    • STL 7:26 AM
      8h 54m
      1 stop
      SEA 2:20 PM
      St. Louis - Seattle | Fri, Nov 13 | American Airlines
      SEA 11:34 PM
      9h 13m
      1 stop
      STL 10:47 AM
      Seattle - St. Louis | Wed, Nov 18 | American Airlines
      KRW 214,900
      41% off
      KRW 362,300 KRW 214,900
    • STL 8:00 AM
      7h 51m
      1 stop
      SEA 1:51 PM
      St. Louis - Seattle | Fri, Nov 20 | American Airlines
      SEA 11:34 PM
      8h 42m
      1 stop
      STL 10:16 AM
      Seattle - St. Louis | Fri, Nov 20 | American Airlines
      KRW 214,900
      41% off
      KRW 362,300 KRW 214,900
    • STL 7:26 AM
      8h 54m
      1 stop
      SEA 2:20 PM
      St. Louis - Seattle | Thu, Nov 12 | American Airlines
      SEA 11:34 PM
      9h 13m
      1 stop
      STL 10:47 AM
      Seattle - St. Louis | Thu, Nov 12 | American Airlines
      KRW 214,900
      41% off
      KRW 362,300 KRW 214,900
    • STL 2:20 PM
      6h 21m
      1 stop
      SEA 6:41 PM
      St. Louis - Seattle | Fri, Nov 13 | Delta Air Lines
      SEA 11:15 PM
      8h 10m
      1 stop
      STL 9:25 AM
      Seattle - St. Louis | Wed, Nov 18 | Delta Air Lines
      KRW 219,100
      40% off
      KRW 362,300 KRW 219,100
    • STL 7:00 PM
      6h 59m
      1 stop
      SEA 11:59 PM
      St. Louis - Seattle | Sat, Nov 14 | Delta Air Lines
      SEA 11:15 PM
      8h 10m
      1 stop
      STL 9:25 AM
      Seattle - St. Louis | Thu, Nov 19 | Delta Air Lines
      KRW 219,100
      40% off
      KRW 362,300 KRW 219,100
    • STL 2:20 PM
      6h 21m
      1 stop
      SEA 6:41 PM
      St. Louis - Seattle | Thu, Nov 12 | Delta Air Lines
      SEA 11:15 PM
      8h 10m
      1 stop
      STL 9:25 AM
      Seattle - St. Louis | Thu, Nov 12 | Delta Air Lines
      KRW 219,100
      40% off
      KRW 362,300 KRW 219,100
    • STL 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      St. Louis - Seattle | Fri, Nov 6 | Normal Airline
      SEA 3:00 PM
      6h
      Nonstop
      STL 4:00 PM
      Seattle - St. Louis | Sun, Nov 8 | Normal Airline
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    • Cheapest nonstop
      STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Wed, Jan 6 | Alaska Airlines
      KRW 181,400 KRW 586,800
      69% off
      69% off
      KRW 586,800 KRW 181,400
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Thu, Jan 7 | Alaska Airlines
      KRW 181,600 KRW 586,800
      69% off
      69% off
      KRW 586,800 KRW 181,600
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Tue, Jan 5 | Alaska Airlines
      KRW 181,600 KRW 586,800
      69% off
      69% off
      KRW 586,800 KRW 181,600
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Fri, Jan 8 | Alaska Airlines
      KRW 181,800
      69% off
      KRW 586,800 KRW 181,800
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Sat, Jan 9 | Alaska Airlines
      KRW 184,500
      69% off
      KRW 586,800 KRW 184,500
    • STL 6:00 AM
      4h 36m
      Nonstop
      SEA 8:36 AM
      St. Louis - Seattle | Fri, Nov 20 | Alaska Airlines
      KRW 185,500
      15% off
      KRW 218,300 KRW 185,500
    • STL 6:04 AM
      4h 46m
      Nonstop
      SEA 8:50 AM
      St. Louis - Seattle | Tue, Dec 15 | Alaska Airlines
      KRW 189,900
      13% off
      KRW 218,300 KRW 189,900
    • STL 6:00 AM
      4h 36m
      Nonstop
      SEA 8:36 AM
      St. Louis - Seattle | Sat, Nov 14 | Alaska Airlines
      KRW 249,900
      56% off
      KRW 586,800 KRW 249,900
    • STL 6:04 AM
      4h 46m
      Nonstop
      SEA 8:50 AM
      St. Louis - Seattle | Sat, Dec 5 | Alaska Airlines
      KRW 249,900
      56% off
      KRW 586,800 KRW 249,900
    • STL 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      St. Louis - Seattle | Fri, Nov 6 | Normal Airline
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    • Cheapest nonstop
      STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Wed, Jan 6 | Alaska Airlines
      KRW 181,400 KRW 586,800
      69% off
      69% off
      KRW 586,800 KRW 181,400
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Tue, Jan 5 | Alaska Airlines
      KRW 181,600 KRW 586,800
      69% off
      69% off
      KRW 586,800 KRW 181,600
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Thu, Jan 7 | Alaska Airlines
      KRW 181,600 KRW 586,800
      69% off
      69% off
      KRW 586,800 KRW 181,600
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Fri, Jan 8 | Alaska Airlines
      KRW 181,800
      69% off
      KRW 586,800 KRW 181,800
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Sat, Jan 9 | Alaska Airlines
      KRW 184,500
      69% off
      KRW 586,800 KRW 184,500
    • STL 6:04 AM
      4h 46m
      Nonstop
      SEA 8:50 AM
      St. Louis - Seattle | Sat, Dec 5 | Alaska Airlines
      KRW 249,900
      56% off
      KRW 586,800 KRW 249,900
    • STL 6:00 AM
      4h 36m
      Nonstop
      SEA 8:36 AM
      St. Louis - Seattle | Sat, Nov 14 | Alaska Airlines
      KRW 249,900
      56% off
      KRW 586,800 KRW 249,900
    • STL 6:04 AM
      4h 46m
      Nonstop
      SEA 8:50 AM
      St. Louis - Seattle | Tue, Dec 8 | Alaska Airlines
      KRW 250,800
      56% off
      KRW 586,800 KRW 250,800
    • STL 6:04 AM
      4h 46m
      Nonstop
      SEA 8:50 AM
      St. Louis - Seattle | Sat, Dec 12 | Alaska Airlines
      KRW 250,800
      56% off
      KRW 586,800 KRW 250,800
    • STL 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      St. Louis - Seattle | Fri, Nov 6 | Normal Airline
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    • Cheapest nonstop
      STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Fri, Nov 6 | Alaska Airlines
      KRW 283,000 KRW 587,300
      52% off
      52% off
      KRW 587,300 KRW 283,000
    • STL 7:00 AM
      4h 38m
      Nonstop
      SEA 9:38 AM
      St. Louis - Seattle | Sun, Nov 8 | Alaska Airlines
      KRW 283,000 KRW 587,300
      52% off
      52% off
      KRW 587,300 KRW 283,000
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Thu, Nov 5 | Alaska Airlines
      KRW 283,800 KRW 587,300
      52% off
      52% off
      KRW 587,300 KRW 283,800
    • STL 7:00 AM
      4h 38m
      Nonstop
      SEA 9:38 AM
      St. Louis - Seattle | Sat, Nov 7 | Alaska Airlines
      KRW 510,500
      13% off
      KRW 587,300 KRW 510,500
    • STL 7:00 AM
      4h 38m
      Nonstop
      SEA 9:38 AM
      St. Louis - Seattle | Mon, Nov 9 | Alaska Airlines
      KRW 510,500
      13% off
      KRW 587,300 KRW 510,500
    • STL 6:00 AM
      4h 36m
      Nonstop
      SEA 8:36 AM
      St. Louis - Seattle | Tue, Nov 10 | Alaska Airlines
      KRW 510,900
      13% off
      KRW 587,300 KRW 510,900
    • STL 5:00 PM
      7h 5m
      1 stop
      SEA 10:05 PM
      St. Louis - Seattle | Thu, Nov 5 | Delta Air Lines
      KRW 147,200
      75% off
      KRW 587,300 KRW 147,200
    • STL 12:28 PM
      6h 42m
      1 stop
      SEA 5:10 PM
      St. Louis - Seattle | Tue, Nov 10 | Delta Air Lines
      KRW 329,600
      44% off
      KRW 587,300 KRW 329,600
    • STL 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      St. Louis - Seattle | Fri, Nov 6 | Normal Airline
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    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Fri, Nov 6 | Alaska Airlines
      KRW 283,000 KRW 567,900
      50% off
      50% off
      KRW 567,900 KRW 283,000
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Thu, Nov 5 | Alaska Airlines
      KRW 283,800 KRW 567,900
      50% off
      50% off
      KRW 567,900 KRW 283,800
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Thu, Nov 5 | American Airlines
      KRW 342,500 KRW 567,900
      40% off
      40% off
      KRW 567,900 KRW 342,500
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Fri, Nov 6 | American Airlines
      KRW 342,500
      40% off
      KRW 567,900 KRW 342,500
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Thu, Nov 19 | Alaska Airlines
      KRW 377,900
      33% off
      KRW 567,900 KRW 377,900
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Fri, Nov 13 | Alaska Airlines
      KRW 417,200
      27% off
      KRW 567,900 KRW 417,200
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Thu, Nov 19 | American Airlines
      KRW 482,300
      15% off
      KRW 567,900 KRW 482,300
    • STL 3:23 PM
      4h 30m
      Nonstop
      SEA 5:53 PM
      St. Louis - Seattle | Fri, Nov 13 | American Airlines
      KRW 494,000
      13% off
      KRW 567,900 KRW 494,000
    • STL 3:54 PM
      4h 32m
      Nonstop
      SEA 6:26 PM
      St. Louis - Seattle | Wed, Jan 6 | Alaska Airlines
      KRW 181,400
      69% off
      KRW 586,800 KRW 181,400
    • STL 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      St. Louis - Seattle | Fri, Nov 6 | Normal Airline
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Displayed flight fares from St. Louis to Seattle are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Trip.com Price Insights: Flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport

Which month is the cheapest for round-trip flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport?

The data is based on the average round-trip flight prices on Trip.com for flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport across different months over the past 12 months.

Based on Trip.com data from the past 12 months, February is usually the cheapest month to find flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport, with an average price of KRW 295,700. In contrast, June is typically the most expensive month, with average prices reaching KRW 796,100.

KRW 796,100
KRW 545,900
KRW 295,700
KRW 45,500
    Cheapest
  • KRW 796,100
    Jun
  • KRW 597,900
    Jul
  • KRW 523,400
    Aug
  • KRW 318,900
    Sep
  • KRW 445,000
    Oct
  • KRW 427,500
    Nov
  • KRW 329,200
    Dec
  • KRW 350,300
    Jan
  • KRW 295,700
    Feb
  • KRW 400,100
    Mar
  • KRW 376,500
    Apr
  • KRW 656,800
    May

What is the cheapest day of the week to fly from St. Louis Lambert International Airport to Seattle-Tacoma International Airport?

The data is based on the average flight prices on Trip.com from St. Louis Lambert International Airport to Seattle-Tacoma International Airport across different days of the week over the past 12 months.

Based on Trip.com data from the past 12 months, the cheapest day to depart from St. Louis Lambert International Airport to Seattle-Tacoma International Airport is usually Tuesday, with average fares typically lower than other days. Try to avoid departing on Wednesday, as prices are usually the highest on that day.

KRW 362,800
KRW 308,600
KRW 254,400
KRW 200,200
  • KRW 310,500
    Mon
  • KRW 254,400
    Tue
  • KRW 362,800
    Wed
  • KRW 314,300
    Thu
  • KRW 278,000
    Fri
  • KRW 345,700
    Sat
  • KRW 347,000
    Sun

Which airline offers the cheapest flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport?

The cheapest airline flying from St. Louis Lambert International Airport to Seattle-Tacoma International Airport is Delta Air Lines (from KRW 140,300) among 6 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Delta Air Lines
From KRW 140,300
American Airlines
From KRW 146,200
Frontier Airlines
From KRW 161,700
United Airlines
From KRW 183,600
Alaska Airlines
From KRW 185,500
Hahn Air
From KRW 185,900

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What is the flight schedule from St. Louis Lambert International Airport to Seattle-Tacoma International Airport?

Check the schedule for flights from St. Louis to Seattle and find the flight that best matches your travel plans.

Flight info.
Departure
Arrival
Weekly Schedule

  1. DL2455

    St. Louis Lambert International Airport

    2:15 PM

    STL

    3h 17m

    Nonstop

    4:32 PM

    SLC

    S M - - - - S
    Search

  2. DL871

    Salt Lake City International Airport

    5:10 PM

    SLC

    2h 20m

    Nonstop

    6:30 PM

    SEA

    S M T W T F S

  3. DL5092

    St. Louis Lambert International Airport

    12:31 PM

    STL

    1h 49m

    Nonstop

    2:20 PM

    MSP

    S M - - - - -
    Search

  4. DL877

    Minneapolis-Saint Paul International Airport

    2:40 PM

    MSP

    3h 55m

    Nonstop

    4:35 PM

    SEA

    S M T W T F S

  5. AA2103

    St. Louis Lambert International Airport

    8:29 AM

    STL

    2h 9m

    Nonstop

    10:38 AM

    DFW

    S M T W T F S
    Search

  6. AA717

    Dallas Fort Worth International Airport

    10:44 AM

    DFW

    4h 31m

    Nonstop

    1:15 PM

    SEA

    S M T W T F S

  7. AA2574

    St. Louis Lambert International Airport

    7:56 AM

    STL

    3h 36m

    Nonstop

    10:32 AM

    PHX

    S M T W T F S
    Search

  8. AA2073

    Phoenix Sky Harbor International Airport

    11:30 AM

    PHX

    3h 21m

    Nonstop

    1:51 PM

    SEA

    S M T W T F S

  9. DL1492

    St. Louis Lambert International Airport

    5:00 PM

    STL

    3h 26m

    Nonstop

    7:26 PM

    SLC

    S M T W T F S
    Search

  10. DL2998

    Salt Lake City International Airport

    10:45 PM

    SLC

    2h 26m

    Nonstop

    12:11 AM

    SEA

    S M - - - - S

  11. AA2261

    St. Louis Lambert International Airport

    5:00 AM

    STL

    2h 8m

    Nonstop

    7:08 AM

    DFW

    S M T W T F S
    Search

  12. AA767

    Dallas Fort Worth International Airport

    8:39 AM

    DFW

    4h 33m

    Nonstop

    11:12 AM

    SEA

    S M T W T F S

  13. AA1926

    St. Louis Lambert International Airport

    7:24 AM

    STL

    1h 36m

    Nonstop

    9:00 AM

    ORD

    S M T W T F S
    Search

  14. AA2398

    O'Hare International Airport

    11:30 AM

    ORD

    4h 50m

    Nonstop

    2:20 PM

    SEA

    S M T W T F S

  15. AA2897

    St. Louis Lambert International Airport

    10:21 AM

    STL

    2h 4m

    Nonstop

    12:25 PM

    DFW

    S M T W T F S
    Search

  16. AA727

    Dallas Fort Worth International Airport

    2:25 PM

    DFW

    4h 29m

    Nonstop

    4:54 PM

    SEA

    S M T W - F S

  17. DL1839

    St. Louis Lambert International Airport

    5:29 PM

    STL

    1h 42m

    Nonstop

    7:11 PM

    MSP

    S M - - - - -
    Search

  18. DL505

    Minneapolis-Saint Paul International Airport

    9:50 PM

    MSP

    4h 3m

    Nonstop

    11:53 PM

    SEA

    S M - - - - S

  19. DL2363

    St. Louis Lambert International Airport

    7:30 AM

    STL

    3h 23m

    Nonstop

    9:53 AM

    SLC

    S M T W T F S
    Search

  20. DL2921

    Salt Lake City International Airport

    1:20 PM

    SLC

    2h 23m

    Nonstop

    2:43 PM

    SEA

    S M - - - - S
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About St. Louis Lambert International Airport and Seattle-Tacoma International Airport

Learn about St. Louis Lambert International Airport (STL) and Seattle-Tacoma International Airport (SEA) — including location, terminals, transportation, and travel tips.

Flight distance 2,747.47 km
Cheapest one-way ticket price KRW 140,300
Cheapest return ticket price KRW 214,900

FAQs for St. Louis Lambert International Airport to Seattle-Tacoma International Airport Flights

  • How long is the flight from St. Louis Lambert International Airport to Seattle-Tacoma International Airport?

    St. Louis Lambert International Airport to Seattle-Tacoma International Airport takes about 3 hours 58 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 2 daily flights from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA).
  • The earliest flight from St. Louis Lambert International Airport to Seattle-Tacoma International Airport departs at 06:02, and the last departs at 16:42, with about 2 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) is quite popular. Without considering departure times or holidays, tickets cost around KRW 574,800 in November, the most expensive month to book this route.
    • The distance from Seattle-Tacoma International Airport to downtown is about 17 km. It takes about 30 minutes by taxi.
  • American Airlines is a very popular airline operating an average of 678 flights per month.
  • One-way flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport currently start from KRW 140,300, and round-trip fares start from KRW 214,900. The current lowest fare is a Delta Air Lines flight departing on Wed, Dec 2; prices may vary depending on availability.
  • Yes. Alaska Airlines operate direct flights from St. Louis Lambert International Airport to Seattle-Tacoma International Airport, with an average flight time of 3 hours 53 minutes, and around 13 weekly flights. Actual flight frequency may vary by season.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from St. Louis Lambert International Airport to Seattle-Tacoma International Airport is KRW 303,000. Prices may vary depending on the departure date, airline, and availability.
  • St. Louis Lambert International Airport to Seattle-Tacoma International Airport operates around 13 weekly flights, mainly by Alaska Airlines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter St. Louis Lambert International Airport and Seattle-Tacoma International Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

Popular Destinations

Note: Prices shown on this page are the lowest estimated prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before payment. Charges for checked baggage, onboard meals, Wi-Fi, and other optional services may also appear in the flight cards where applicable.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours, and for many routes the data may refresh in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.