Trip.com
>
Flights
>
Flights to United States
>
Flights to Missouri
>
Flights to St. Louis
>
Seattle to St. Louis flight
>
Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport flight

Explore the cheapest one-way and round-trip flights from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport over the next 90 days, with one-way fares from $81 and round-trip from $159. Based on Trip.com's latest 7-day flight data.

      • SEA 5:10 AM
        6h 54m
        1 stop
        STL 2:04 PM
        Seattle - St. Louis | Wed, Nov 11 | American Airlines
        STL 5:00 AM
        8h 12m
        1 stop
        SEA 11:12 AM
        St. Louis - Seattle | Fri, Nov 13 | American Airlines
        $159 $299
        47% off
        47% off
        $299 $159
      • SEA 11:15 PM
        8h 10m
        1 stop
        STL 9:25 AM
        Seattle - St. Louis | Wed, Nov 11 | Delta Air Lines
        STL 5:22 PM
        8h 35m
        1 stop
        SEA 11:57 PM
        St. Louis - Seattle | Fri, Nov 13 | Delta Air Lines
        $162 $299
        46% off
        46% off
        $299 $162
      • SEA 11:50 PM
        8h 48m
        1 stop
        STL 10:38 AM
        Seattle - St. Louis | Sat, Oct 10 | Delta Air Lines
        STL 5:35 PM
        8h 24m
        1 stop
        SEA 11:59 PM
        St. Louis - Seattle | Wed, Oct 14 | Delta Air Lines
        $163 $299
        45% off
        45% off
        $299 $163
      • SEA 11:50 PM
        7h 3m
        1 stop
        STL 8:53 AM
        Seattle - St. Louis | Wed, Oct 21 | Delta Air Lines
        STL 6:47 AM
        9h 58m
        1 stop
        SEA 2:45 PM
        St. Louis - Seattle | Wed, Oct 28 | Delta Air Lines
        $204
        32% off
        $299 $204
      • SEA 11:10 PM
        8h 39m
        1 stop
        STL 9:49 AM
        Seattle - St. Louis | Sat, Oct 24 | Delta Air Lines
        STL 9:47 AM
        9h 11m
        1 stop
        SEA 4:58 PM
        St. Louis - Seattle | Wed, Oct 28 | Delta Air Lines
        $206
        31% off
        $299 $206
      • SEA 11:10 PM
        8h 39m
        1 stop
        STL 9:49 AM
        Seattle - St. Louis | Sun, Oct 25 | Delta Air Lines
        STL 5:35 PM
        8h 24m
        1 stop
        SEA 11:59 PM
        St. Louis - Seattle | Tue, Oct 27 | Delta Air Lines
        $207
        31% off
        $299 $207
      • SEA 12:10 AM
        7h 39m
        1 stop
        STL 9:49 AM
        Seattle - St. Louis | Mon, Oct 26 | Delta Air Lines
        STL 6:47 AM
        9h 58m
        1 stop
        SEA 2:45 PM
        St. Louis - Seattle | Thu, Oct 29 | Delta Air Lines
        $207
        31% off
        $299 $207
      • SEA 4:27 PM
        24h 30m
        1 stop
        STL 6:57 PM
        Seattle - St. Louis | Sat, Oct 24 | Frontier Airlines
        STL 5:35 PM
        8h 24m
        1 stop
        SEA 11:59 PM
        St. Louis - Seattle | Wed, Oct 28 | Delta Air Lines
        $208
        30% off
        $299 $208
      • SEA 9:42 AM
        6h 2m
        1 stop
        STL 5:44 PM
        Seattle - St. Louis | Thu, Oct 29 | Delta Air Lines
        STL 10:35 AM
        10h
        1 stop
        SEA 6:35 PM
        St. Louis - Seattle | Sun, Nov 1 | Delta Air Lines
        $209
        30% off
        $299 $209
      • SEA 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Seattle - St. Louis | Tue, Oct 6 | Normal Airline
        STL 3:00 PM
        6h
        Nonstop
        SEA 4:00 PM
        St. Louis - Seattle | Thu, Oct 8 | Normal Airline
        Find more flights
        Find more flights
      • Cheapest nonstop
        SEA 6:00 PM
        3h 59m
        Nonstop
        STL 11:59 PM
        Seattle - St. Louis | Fri, Oct 16 | Alaska Airlines
        $126 $229
        45% off
        45% off
        $229 $126
      • SEA 6:07 PM
        3h 52m
        Nonstop
        STL 11:59 PM
        Seattle - St. Louis | Thu, Nov 19 | Alaska Airlines
        $160 $229
        30% off
        30% off
        $229 $160
      • SEA 6:00 AM
        9h 19m
        1 stop
        STL 5:19 PM
        Seattle - St. Louis | Wed, Oct 28 | Delta Air Lines
        $81 $229
        65% off
        65% off
        $229 $81
      • SEA 6:12 AM
        8h 41m
        1 stop
        STL 4:53 PM
        Seattle - St. Louis | Wed, Oct 28 | American Airlines
        $83
        64% off
        $229 $83
      • SEA 6:00 AM
        7h 37m
        1 stop
        STL 3:37 PM
        Seattle - St. Louis | Sat, Oct 31 | Delta Air Lines
        $101
        56% off
        $229 $101
      • SEA 11:10 PM
        8h 39m
        1 stop
        STL 9:49 AM
        Seattle - St. Louis | Tue, Nov 3 | Delta Air Lines
        $105
        54% off
        $229 $105
      • SEA 5:30 AM
        6h 2m
        1 stop
        STL 1:32 PM
        Seattle - St. Louis | Wed, Nov 4 | Delta Air Lines
        $105
        54% off
        $229 $105
      • SEA 11:10 PM
        8h 39m
        1 stop
        STL 9:49 AM
        Seattle - St. Louis | Tue, Oct 20 | Delta Air Lines
        $105
        54% off
        $229 $105
      • SEA 7:15 AM
        8h 29m
        1 stop
        STL 5:44 PM
        Seattle - St. Louis | Wed, Oct 21 | Delta Air Lines
        $105
        54% off
        $229 $105
      • SEA 6:00 AM
        6h 45m
        1 stop
        STL 2:45 PM
        Seattle - St. Louis | Sat, Nov 7 | Delta Air Lines
        $105
        54% off
        $229 $105
      • SEA 6:00 AM
        9h 20m
        1 stop
        STL 5:20 PM
        Seattle - St. Louis | Wed, Dec 2 | Delta Air Lines
        $105
        54% off
        $229 $105
      • SEA 3:14 PM
        7h 5m
        1 stop
        STL 12:19 AM
        Seattle - St. Louis | Tue, Oct 20 | American Airlines
        $109
        52% off
        $229 $109
      • SEA 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Seattle - St. Louis | Tue, Oct 6 | Normal Airline
        Find more flights
        Find more flights

Displayed flight fares from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport 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 Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport

What is the cheapest month for one-way flights from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport?

Data is based on average one-way flight prices from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport in Trip.com's database over the past 12 months.

Based on Trip.com’s data from the past 12 months, if you’re looking for a low-cost one-way ticket from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport, the best time to buy is in September, with an average price of $167. You’ll want to avoid December, when the average price can reach as high as $384.

$384
$276
$167
$59
  • $167
    Sep
  • $173
    Oct
  • $274
    Nov
  • $384
    Dec
  • $265
    Jan
  • $227
    Feb
  • $173
    Mar
  • $179
    Apr
  • $295
    May
  • $244
    Jun
  • $224
    Jul
  • $287
    Aug

What is the cheapest day of the week to fly from Seattle Tacoma Intl. 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 Intl. 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 day to depart from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport is Friday, with average fares typically lower than other days. You’ll want to avoid flying on Saturday, as ticket prices are usually the highest that day.

$348
$284
$219
$155
    Cheapest
  • $325
    Mon
  • $239
    Tue
  • $231
    Wed
  • $253
    Thu
  • $219
    Fri
  • $348
    Sat
  • $226
    Sun

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

The cheapest airline flying from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport is Delta Air Lines (from $81) among 7 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Delta Air Lines
From $81
American Airlines
From $83
Alaska Airlines
From $126
Frontier Airlines
From $135
United Airlines
From $151
Hahn Air
From $223
Sun Country Airlines
From $275

Find more flights and airlines

What is the flight schedule from Seattle Tacoma Intl. 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 Intl. Airport

    5:45 AM

    SEA

    2h 6m

    Nonstop

    8:51 AM

    SLC

    S M T W T F S
    Search

  2. DL2455

    Salt Lake City International Airport

    9:30 AM

    SLC

    2h 53m

    Nonstop

    1:23 PM

    STL

    S M T W T F S

  3. DL1120

    Seattle Tacoma Intl. Airport

    1:30 PM

    SEA

    2h 7m

    Nonstop

    4:37 PM

    SLC

    S M T W T F S
    Search

  4. DL2666

    Salt Lake City International Airport

    8:45 PM

    SLC

    2h 51m

    Nonstop

    12:36 AM

    STL

    S M T W T F S

  5. DL943

    Seattle Tacoma Intl. Airport

    6:05 AM

    SEA

    3h 27m

    Nonstop

    11:32 AM

    MSP

    S M T W T F S
    Search

  6. DL3787

    Minneapolis-Saint Paul International Airport

    1:05 PM

    MSP

    1h 40m

    Nonstop

    2:45 PM

    STL

    - M T W T F -

  7. AA1476

    Seattle Tacoma Intl. Airport

    3:14 PM

    SEA

    4h 15m

    Nonstop

    9:29 PM

    ORD

    S M T W T F S
    Search

  8. AA3069

    O'Hare Intl. Airport

    10:39 PM

    ORD

    1h 23m

    Nonstop

    12:02 AM

    STL

    S M T W T F S

  9. AA767

    Seattle Tacoma Intl. Airport

    12:02 PM

    SEA

    4h 5m

    Nonstop

    6:07 PM

    DFW

    S M T W T F S
    Search

  10. AA1010

    Dallas Fort Worth International Airport

    8:08 PM

    DFW

    1h 49m

    Nonstop

    9:57 PM

    STL

    S M T W T F S

  11. DL953

    Seattle Tacoma Intl. Airport

    11:53 PM

    SEA

    3h 22m

    Nonstop

    5:15 AM

    MSP

    S M T W T F S
    Search

  12. DL5286

    Minneapolis-Saint Paul International Airport

    7:00 AM

    MSP

    1h 48m

    Nonstop

    8:48 AM

    STL

    S M T W T - S

  13. DL812

    Seattle Tacoma Intl. Airport

    6:00 AM

    SEA

    4h 15m

    Nonstop

    1:15 PM

    DTW

    S M T W T F S
    Search

  14. DL1371

    Detroit Metropolitan Wayne County Airport

    12:30 PM

    DTW

    1h 36m

    Nonstop

    1:06 PM

    STL

    S M T W T F S

  15. AA3234

    Seattle Tacoma Intl. Airport

    10:31 AM

    SEA

    4h 24m

    Nonstop

    4:55 PM

    ORD

    S M T W T F S
    Search

  16. AA2444

    O'Hare Intl. Airport

    7:18 PM

    ORD

    1h 26m

    Nonstop

    8:44 PM

    STL

    S M T W T F S

  17. DL2858

    Seattle Tacoma Intl. Airport

    7:15 AM

    SEA

    2h 16m

    Nonstop

    10:31 AM

    SLC

    S M T W T F S
    Search

  18. DL1492

    Salt Lake City International Airport

    1:55 PM

    SLC

    2h 49m

    Nonstop

    5:44 PM

    STL

    S M T W T - S

  19. DL810

    Seattle Tacoma Intl. Airport

    11:05 PM

    SEA

    4h 21m

    Nonstop

    6:26 AM

    DTW

    S M T W T F S
    Search

  20. DL2868

    Detroit Metropolitan Wayne County Airport

    8:50 AM

    DTW

    1h 39m

    Nonstop

    9:29 AM

    STL

    S M T W T F S
Find more flights and airlines

About Seattle Tacoma Intl. Airport and St. Louis Lambert International Airport

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

Flight distance 2,747.47 km
Cheapest one-way ticket price $81
Cheapest return ticket price $159

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

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

    Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport takes about 3 hours 27 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 2 daily flights from Seattle Tacoma Intl. Airport (SEA) to St. Louis Lambert International Airport (STL).
  • The earliest flight from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport departs at 08:03, 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 Intl. Airport (SEA) to St. Louis Lambert International Airport (STL) is quite popular. Without considering departure times or holidays, tickets cost around $388 in October, the most expensive month to book this route.
  • The earliest flight departs from Seattle Tacoma Intl. Airport (SEA) at 07:00 and arrives in St. Louis Lambert International Airport (STL) at 15:46.
  • The latest flight departs from Seattle Tacoma Intl. Airport (SEA) at 18:05 and arrives in St. Louis Lambert International Airport (STL) at 23:59.
    • The distance from St. Louis Lambert International Airport to downtown is about 20 km. It takes about 40 minutes by taxi.
  • American Airlines is a very popular airline operating an average of 693 flights per month.
  • One-way flights from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport currently start from $81, and round-trip fares start from $159. The current lowest fare is a Delta Air Lines flight departing on Wed, Oct 28; prices may vary depending on availability.
  • Yes. Alaska Airlines operate direct flights from Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport, with an average flight time of 3 hours 18 minutes, and around 21 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 Intl. Airport to St. Louis Lambert International Airport is $226. Prices may vary depending on the departure date, airline, and availability.
  • Seattle Tacoma Intl. Airport to St. Louis Lambert International Airport operates around 23 weekly flights, mainly by Alaska Airlines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter Seattle Tacoma Intl. 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.

Popular Destinations

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

Book with no extra fees

Prices displayed in 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, WLAN, 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 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.