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

Explore the cheapest one-way and round-trip flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport over the next 90 days, with one-way fares from €70 and round-trip from €139. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        SEA 12:35
        4h 3m
        Direct
        STL 18:38
        Seattle - St. Louis | Wed, Sep 30 | Alaska Airlines
        STL 10:55
        4h 20m
        Direct
        SEA 13:15
        St. Louis - Seattle | Sun, Oct 4 |
        €215 €335
        36% off
        36% off
        €335 €215
      • SEA 18:03
        3h 56m
        Direct
        STL 23:59
        Seattle - St. Louis | Sun, Sep 27 | Alaska Airlines
        STL 10:55
        4h 20m
        Direct
        SEA 13:15
        St. Louis - Seattle | Sun, Oct 4 |
        €268 €335
        20% off
        20% off
        €335 €268
      • SEA 15:41
        6h 46m
        1 stop
        STL 00:27
        Seattle - St. Louis | Thu, Sep 24 | American Airlines
        STL 05:43
        7h 28m
        1 stop
        SEA 11:11
        St. Louis - Seattle | Tue, Sep 29 | American Airlines
        €139 €335
        59% off
        59% off
        €335 €139
      • SEA 05:00
        7h 30m
        1 stop
        STL 14:30
        Seattle - St. Louis | Sat, Oct 17 | American Airlines
        STL 19:10
        7h
        1 stop
        SEA 00:10
        St. Louis - Seattle | Sat, Oct 24 | American Airlines
        €139
        59% off
        €335 €139
      • SEA 05:10
        6h 54m
        1 stop
        STL 14:04
        Seattle - St. Louis | Tue, Nov 10 | American Airlines
        STL 05:00
        8h 12m
        1 stop
        SEA 11:12
        St. Louis - Seattle | Thu, Nov 12 | American Airlines
        €139
        59% off
        €335 €139
      • SEA 05:30
        7h 14m
        1 stop
        STL 14:44
        Seattle - St. Louis | Tue, Sep 29 | American Airlines
        STL 05:00
        7h 9m
        1 stop
        SEA 10:09
        St. Louis - Seattle | Thu, Oct 1 | American Airlines
        €139
        59% off
        €335 €139
      • SEA 15:41
        6h 46m
        1 stop
        STL 00:27
        Seattle - St. Louis | Mon, Sep 28 | American Airlines
        STL 05:00
        7h 9m
        1 stop
        SEA 10:09
        St. Louis - Seattle | Thu, Oct 1 | American Airlines
        €139
        59% off
        €335 €139
      • SEA 06:00
        7h 14m
        1 stop
        STL 15:14
        Seattle - St. Louis | Sat, Sep 26 | Delta Air Lines
        STL 16:10
        7h 55m
        1 stop
        SEA 22:05
        St. Louis - Seattle | Sat, Oct 3 | Delta Air Lines
        €141
        57% off
        €335 €141
      • SEA 23:15
        8h 10m
        1 stop
        STL 09:25
        Seattle - St. Louis | Tue, Nov 10 | Delta Air Lines
        STL 17:22
        8h 35m
        1 stop
        SEA 23:57
        St. Louis - Seattle | Thu, Nov 12 | Delta Air Lines
        €142
        57% off
        €335 €142
      • SEA 23:50
        8h 48m
        1 stop
        STL 10:38
        Seattle - St. Louis | Fri, Oct 9 | Delta Air Lines
        STL 17:35
        8h 24m
        1 stop
        SEA 23:59
        St. Louis - Seattle | Tue, Oct 13 | Delta Air Lines
        €142
        57% off
        €335 €142
      • SEA 15:41
        6h 46m
        1 stop
        STL 00:27
        Seattle - St. Louis | Sat, Sep 26 | American Airlines
        STL 07:21
        9h 30m
        1 stop
        SEA 14:51
        St. Louis - Seattle | Fri, Oct 2 | American Airlines
        €145
        56% off
        €335 €145
      • SEA 15:41
        6h 46m
        1 stop
        STL 00:27
        Seattle - St. Louis | Fri, Oct 2 | American Airlines
        STL 05:40
        7h 34m
        1 stop
        SEA 11:14
        St. Louis - Seattle | Tue, Oct 6 | American Airlines
        €145
        56% off
        €335 €145
      • SEA 16:27
        24h 50m
        1 stop
        STL 19:17
        Seattle - St. Louis | Thu, Sep 24 | Frontier Airlines
        STL 20:10
        20h 58m
        1 stop
        SEA 15:08
        St. Louis - Seattle | Sat, Sep 26 | Frontier Airlines
        €149
        56% off
        €335 €149
      • SEA 13:00
        17h 25m
        1 stop
        STL 14:00
        Seattle - St. Louis | Thu, Sep 24 | Normal Airline
        STL 15:00
        6h
        Direct
        SEA 16:00
        St. Louis - Seattle | Sat, Sep 26 | Normal Airline
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      • Cheapest nonstop
        SEA 18:00
        3h 59m
        Direct
        STL 23:59
        Seattle - St. Louis | Tue, Oct 13 | Alaska Airlines
        €110 €175
        37% off
        37% off
        €175 €110
      • SEA 18:07
        3h 52m
        Direct
        STL 23:59
        Seattle - St. Louis | Mon, Nov 16 | Alaska Airlines
        €140 €175
        20% off
        20% off
        €175 €140
      • SEA 06:00
        9h 19m
        1 stop
        STL 17:19
        Seattle - St. Louis | Wed, Nov 4 | Delta Air Lines
        €70 €175
        60% off
        60% off
        €175 €70
      • SEA 06:12
        8h 41m
        1 stop
        STL 16:53
        Seattle - St. Louis | Wed, Nov 4 | American Airlines
        €73
        57% off
        €175 €73
      • SEA 06:00
        8h 47m
        1 stop
        STL 16:47
        Seattle - St. Louis | Sat, Oct 10 | Delta Air Lines
        €73
        57% off
        €175 €73
      • SEA 23:57
        8h 21m
        1 stop
        STL 10:18
        Seattle - St. Louis | Sat, Oct 10 | American Airlines
        €73
        57% off
        €175 €73
      • SEA 23:59
        8h 32m
        1 stop
        STL 10:31
        Seattle - St. Louis | Wed, Sep 30 | Delta Air Lines
        €74
        57% off
        €175 €74
      • SEA 06:00
        7h 14m
        1 stop
        STL 15:14
        Seattle - St. Louis | Sat, Sep 26 | Delta Air Lines
        €79
        55% off
        €175 €79
      • SEA 16:27
        24h 47m
        1 stop
        STL 19:14
        Seattle - St. Louis | Fri, Nov 6 | Frontier Airlines
        €80
        54% off
        €175 €80
      • SEA 16:27
        24h 30m
        1 stop
        STL 18:57
        Seattle - St. Louis | Fri, Oct 30 | Frontier Airlines
        €80
        54% off
        €175 €80
      • SEA 05:30
        9h 10m
        1 stop
        STL 16:40
        Seattle - St. Louis | Wed, Sep 30 | American Airlines
        €86
        51% off
        €175 €86
      • SEA 23:10
        8h 39m
        1 stop
        STL 09:49
        Seattle - St. Louis | Tue, Nov 10 | Delta Air Lines
        €91
        48% off
        €175 €91
      • SEA 13:00
        17h 25m
        1 stop
        STL 14:00
        Seattle - St. Louis | Thu, Sep 24 | Normal Airline
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Flight fares from Seattle-Tacoma International Airport to St. Louis Lambert International Airport are based on average airline prices for the next 3 months, according to Trip.com’s latest data.

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

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

The data is based on the past 12 months and shows the average one-way ticket prices from Seattle-Tacoma International Airport to St. Louis Lambert International Airport for each month in the Trip.com database.

Based on Trip.com's data from the past 12 months, the cheapest one-way flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport are usually in September, with an average price of €146. It is best to avoid December, when the average price can reach €335.

€335
€241
€146
€52
  • €146
    Sep
  • €151
    Oct
  • €239
    Nov
  • €335
    Dec
  • €231
    Jan
  • €199
    Feb
  • €151
    Mar
  • €157
    Apr
  • €258
    May
  • €213
    Jun
  • €195
    Jul
  • €251
    Aug

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

The data is based on the past 12 months and shows the average ticket prices from Seattle-Tacoma International Airport to St. Louis Lambert International Airport for each day of the week in the Trip.com database.

Based on Trip.com's data from the past 12 months, the cheapest departure day from Seattle-Tacoma International Airport to St. Louis Lambert International Airport is Tuesday, with average prices usually lower than other days. Avoid departing on Saturday as prices are typically highest on that day.

€303
€228
€152
€77
  • €271
    Mon
  • €152
    Tue
  • €196
    Wed
  • €217
    Thu
  • €192
    Fri
  • €303
    Sat
  • €198
    Sun

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

The cheapest airline flying from Seattle-Tacoma International Airport to St. Louis Lambert International Airport is Delta Air Lines (from €70) among 6 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Delta Air Lines
From €70
American Airlines
From €72
Alaska Airlines
From €110
Frontier Airlines
From €118
United Airlines
From €131
Hahn Air
From €195

Find more flights and airlines

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

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

Flight info.
Departure
Arrival
Weekly Schedule

  1. DL1128

    Seattle-Tacoma International Airport

    05:20

    SEA

    2h 4m

    Direct

    08:24

    SLC

    S M T W T F S
    Search

  2. DL2455

    Salt Lake City International Airport

    09:30

    SLC

    2h 53m

    Direct

    13:23

    STL

    S M T W T F S

  3. DL1120

    Seattle-Tacoma International Airport

    13:25

    SEA

    2h 4m

    Direct

    16:29

    SLC

    S M T W T F S
    Search

  4. DL2666

    Salt Lake City International Airport

    20:45

    SLC

    2h 51m

    Direct

    00:36

    STL

    S M T W T F S

  5. AA1476

    Seattle-Tacoma International Airport

    15:41

    SEA

    4h 29m

    Direct

    22:10

    ORD

    S M T W T F S
    Search

  6. AA3069

    O'Hare International Airport

    23:05

    ORD

    1h 22m

    Direct

    00:27

    STL

    S M T W T F S

  7. AA767

    Seattle-Tacoma International Airport

    12:02

    SEA

    4h 5m

    Direct

    18:07

    DFW

    S M T W T F S
    Search

  8. AA1010

    Dallas Fort Worth International Airport

    20:08

    DFW

    1h 49m

    Direct

    21:57

    STL

    - - - W - - S

  9. DL812

    Seattle-Tacoma International Airport

    06:00

    SEA

    4h 15m

    Direct

    13:15

    DTW

    S M T W T F S
    Search

  10. DL1371

    Detroit Metropolitan Wayne County Airport

    12:30

    DTW

    1h 36m

    Direct

    13:06

    STL

    S M T W T F S

  11. AA2379

    Seattle-Tacoma International Airport

    23:34

    SEA

    4h 1m

    Direct

    05:35

    ORD

    S M T W T F S
    Search

  12. AA2818

    O'Hare International Airport

    08:55

    ORD

    1h 23m

    Direct

    10:18

    STL

    S M T W T F S

  13. DL2858

    Seattle-Tacoma International Airport

    07:15

    SEA

    2h 16m

    Direct

    10:31

    SLC

    S M T W T F S
    Search

  14. DL1492

    Salt Lake City International Airport

    13:55

    SLC

    2h 49m

    Direct

    17:44

    STL

    S M T W T - S

  15. DL953

    Seattle-Tacoma International Airport

    23:53

    SEA

    3h 22m

    Direct

    05:15

    MSP

    S M T W T F S
    Search

  16. DL1289

    Minneapolis-Saint Paul International Airport

    09:00

    MSP

    1h 31m

    Direct

    10:31

    STL

    S M T W T - S

  17. DL810

    Seattle-Tacoma International Airport

    23:14

    SEA

    4h 16m

    Direct

    06:30

    DTW

    S M T W T F S
    Search

  18. DL2868

    Detroit Metropolitan Wayne County Airport

    08:50

    DTW

    1h 46m

    Direct

    09:36

    STL

    S M T W T F S

  19. DL943

    Seattle-Tacoma International Airport

    06:00

    SEA

    3h 19m

    Direct

    11:19

    MSP

    S M T W T F S
    Search

  20. DL1224

    Minneapolis-Saint Paul International Airport

    15:15

    MSP

    1h 32m

    Direct

    16:47

    STL

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

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

Flight distance2,747.47km
Cheapest one-way ticket price€70
Cheapest return ticket price€139

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

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

    Seattle-Tacoma International Airport to St. Louis Lambert International Airport takes about 3 hours 31 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 3 daily flights from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL).
  • The earliest flight from Seattle-Tacoma International Airport to St. Louis Lambert International Airport departs at 08:13, and the last departs at 18:03, with about 6 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) is quite popular. Without considering departure times or holidays, tickets cost around €387 in September, the most expensive month to book this route.
    • The distance from St. Louis Lambert International Airport to downtown is about 20km, by taxi about 40 minutes.
  • American Airlines is a very popular airline operating an average of 693 flights per month.
  • One-way flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport currently start from €70, and round-trip fares start from €139. The current lowest fare is a Delta Air Lines flight departing on Wed, Nov 4; prices may vary depending on availability.
  • Yes. Alaska Airlines operate direct flights from Seattle-Tacoma International Airport to St. Louis Lambert International Airport, with an average flight time of 3 hours 18 minutes, and around 23 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 Seattle-Tacoma International Airport to St. Louis Lambert International Airport is €181. Prices may vary depending on the departure date, airline, and availability.
  • Seattle-Tacoma International Airport to St. Louis Lambert International Airport operates around 15 weekly flights, mainly by Alaska Airlines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter Seattle-Tacoma International Airport and St. Louis Lambert 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.

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

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Prices displayed on this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, Wi-Fi, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within the last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.