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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 US$80 and round-trip from US$160. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        SEA 18:07
        3h 52m
        Direct
        STL 23:59
        Seattle - St. Louis | Fri, Nov 6 | Alaska Airlines
        STL 06:00
        4h 36m
        Direct
        SEA 08:36
        St. Louis - Seattle | Sat, Nov 14 | Alaska Airlines
        US$205 US$228
        10% off
        10% off
        US$228 US$205
      • 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
        US$160 US$228
        30% off
        30% off
        US$228 US$160
      • 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
        US$163 US$228
        28% off
        28% off
        US$228 US$163
      • SEA 16:27
        24h 47m
        1 stop
        STL 19:14
        Seattle - St. Louis | Fri, Nov 6 | Frontier Airlines
        STL 06:40
        10h 10m
        1 stop
        SEA 14:50
        St. Louis - Seattle | Sat, Nov 14 | Delta Air Lines
        US$177
        22% off
        US$228 US$177
      • SEA 23:50
        8h 48m
        1 stop
        STL 10:38
        Seattle - St. Louis | Fri, Nov 6 | Delta Air Lines
        STL 10:20
        10h 17m
        1 stop
        SEA 18:37
        St. Louis - Seattle | Sat, Nov 14 | Delta Air Lines
        US$181
        21% off
        US$228 US$181
      • SEA 06:00
        7h 37m
        1 stop
        STL 15:37
        Seattle - St. Louis | Sat, Nov 7 | Delta Air Lines
        STL 16:39
        7h 19m
        1 stop
        SEA 21:58
        St. Louis - Seattle | Sat, Nov 14 | Delta Air Lines
        US$181
        21% off
        US$228 US$181
      • SEA 23:15
        8h 10m
        1 stop
        STL 09:25
        Seattle - St. Louis | Fri, Nov 13 | Delta Air Lines
        STL 19:00
        6h 59m
        1 stop
        SEA 23:59
        St. Louis - Seattle | Sun, Nov 15 | Delta Air Lines
        US$194
        15% off
        US$228 US$194
      • SEA 16:27
        24h 47m
        1 stop
        STL 19:14
        Seattle - St. Louis | Fri, Nov 13 | Frontier Airlines
        STL 19:00
        6h 59m
        1 stop
        SEA 23:59
        St. Louis - Seattle | Sun, Nov 15 | Delta Air Lines
        US$198
        13% off
        US$228 US$198
      • SEA 16:58
        15h 59m
        1 stop
        STL 10:57
        Seattle - St. Louis | Fri, Dec 4 | Frontier Airlines
        STL 17:20
        8h 33m
        1 stop
        SEA 23:53
        St. Louis - Seattle | Sun, Dec 6 | Delta Air Lines
        US$198
        13% off
        US$228 US$198
      • SEA 06:00
        9h 20m
        1 stop
        STL 17:20
        Seattle - St. Louis | Fri, Dec 4 | Delta Air Lines
        STL 17:20
        8h 33m
        1 stop
        SEA 23:53
        St. Louis - Seattle | Sun, Dec 6 | Delta Air Lines
        US$207
        9% off
        US$228 US$207
      • SEA 23:10
        8h 39m
        1 stop
        STL 09:49
        Seattle - St. Louis | Sat, Oct 24 | Delta Air Lines
        STL 17:35
        8h 24m
        1 stop
        SEA 23:59
        St. Louis - Seattle | Mon, Oct 26 | Delta Air Lines
        US$207
        9% off
        US$228 US$207
      • SEA 13:00
        17h 25m
        1 stop
        STL 14:00
        Seattle - St. Louis | Wed, Oct 14 | Normal Airline
        STL 15:00
        6h
        Direct
        SEA 16:00
        St. Louis - Seattle | Fri, Oct 16 | Normal Airline
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      • Cheapest nonstop
        SEA 10:50
        3h 50m
        Direct
        STL 16:40
        Seattle - St. Louis | Tue, Dec 8 | Alaska Airlines
        US$96 US$106
        9% off
        9% off
        US$106 US$96
      • SEA 13:45
        7h 41m
        1 stop
        STL 23:26
        Seattle - St. Louis | Mon, Dec 7 | Delta Air Lines
        US$80 US$106
        25% off
        25% off
        US$106 US$80
      • SEA 14:07
        7h 26m
        1 stop
        STL 23:33
        Seattle - St. Louis | Tue, Nov 17 | American Airlines
        US$80 US$106
        25% off
        25% off
        US$106 US$80
      • SEA 23:34
        9h 19m
        1 stop
        STL 10:53
        Seattle - St. Louis | Sat, Nov 7 | American Airlines
        US$80
        25% off
        US$106 US$80
      • SEA 06:00
        9h 19m
        1 stop
        STL 17:19
        Seattle - St. Louis | Wed, Oct 28 | Delta Air Lines
        US$81
        24% off
        US$106 US$81
      • SEA 15:28
        6h 34m
        1 stop
        STL 00:02
        Seattle - St. Louis | Mon, Dec 7 | American Airlines
        US$82
        23% off
        US$106 US$82
      • SEA 06:12
        8h 41m
        1 stop
        STL 16:53
        Seattle - St. Louis | Wed, Oct 28 | American Airlines
        US$84
        21% off
        US$106 US$84
      • SEA 23:47
        7h 33m
        1 stop
        STL 09:20
        Seattle - St. Louis | Tue, Nov 17 | Delta Air Lines
        US$84
        21% off
        US$106 US$84
      • SEA 05:30
        6h 2m
        1 stop
        STL 13:32
        Seattle - St. Louis | Sat, Nov 7 | Delta Air Lines
        US$84
        21% off
        US$106 US$84
      • SEA 13:00
        17h 25m
        1 stop
        STL 14:00
        Seattle - St. Louis | Wed, Oct 14 | 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 March, with an average price of US$173. It is best to avoid December, when the average price can reach US$384.

US$384
US$279
US$173
US$68
    Cheapest
  • US$174
    Oct
  • US$274
    Nov
  • US$384
    Dec
  • US$265
    Jan
  • US$228
    Feb
  • US$173
    Mar
  • US$180
    Apr
  • US$296
    May
  • US$244
    Jun
  • US$224
    Jul
  • US$288
    Aug
  • US$205
    Sep

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.

US$348
US$277
US$205
US$134
  • US$326
    Mon
  • US$205
    Tue
  • US$232
    Wed
  • US$254
    Thu
  • US$220
    Fri
  • US$348
    Sat
  • US$227
    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 US$81) among 7 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Delta Air Lines
From US$81
American Airlines
From US$84
Alaska Airlines
From US$126
Frontier Airlines
From US$135
United Airlines
From US$151
Hahn Air
From US$223
Sun Country Airlines
From US$275

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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

    05:45

    SEA

    2h 6m

    Direct

    08:51

    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

    13:30

    SEA

    2h 7m

    Direct

    16:37

    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. AA717

    Seattle-Tacoma International Airport

    14:26

    SEA

    4h 4m

    Direct

    20:30

    DFW

    S M T W T F S
    Search

  6. AA1010

    Dallas Fort Worth International Airport

    20:13

    DFW

    1h 46m

    Direct

    21:59

    STL

    S M T W T F S

  7. DL953

    Seattle-Tacoma International Airport

    23:53

    SEA

    3h 22m

    Direct

    05:15

    MSP

    S M T W T F S
    Search

  8. DL5286

    Minneapolis-Saint Paul International Airport

    07:10

    MSP

    1h 43m

    Direct

    08:53

    STL

    S M T W T - 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

    13:17

    DTW

    1h 36m

    Direct

    13:53

    STL

    S M T W T F S

  11. DL810

    Seattle-Tacoma International Airport

    23:05

    SEA

    4h 21m

    Direct

    06:26

    DTW

    S M T W T F S
    Search

  12. DL2868

    Detroit Metropolitan Wayne County Airport

    09:10

    DTW

    1h 39m

    Direct

    09:49

    STL

    S M T W T F S

  13. AA1872

    Seattle-Tacoma International Airport

    05:50

    SEA

    4h 17m

    Direct

    12:07

    ORD

    S M T W T F S
    Search

  14. AA3620

    O'Hare International Airport

    15:28

    ORD

    1h 25m

    Direct

    16:53

    STL

    S M T W T F S

  15. DL812

    Seattle-Tacoma International Airport

    06:00

    SEA

    4h 15m

    Direct

    13:15

    DTW

    S M T W T F S
    Search

  16. DL2822

    Detroit Metropolitan Wayne County Airport

    16:39

    DTW

    1h 40m

    Direct

    17:19

    STL

    S M T W T - 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 distance 2,747.47km
Cheapest one-way ticket price US$80
Cheapest return ticket price US$160

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 22 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 2 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 08:03, and the last departs at 18:03, with about 5 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 US$315 in October, 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 US$80, and round-trip fares start from US$160. The current lowest fare is a Delta Air Lines flight departing on Mon, Dec 7; 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 17 minutes, and around 14 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 US$226. Prices may vary depending on the departure date, airline, and availability.
  • Seattle-Tacoma International Airport to St. Louis Lambert International Airport operates around 16 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.

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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.
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