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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 MXN$1,517 and round-trip from MXN$3,011. Based on Trip.com's latest 7-day flight data.

Displayed flight fares from Seattle to St. Louis 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 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 MXN$3,264. It is best to avoid December, when the average price can reach MXN$7,256.

MXN$7,256
MXN$5,260
MXN$3,264
MXN$1,268
    Cheapest
  • MXN$5,177
    Nov
  • MXN$7,256
    Dec
  • MXN$5,004
    Jan
  • MXN$4,296
    Feb
  • MXN$3,264
    Mar
  • MXN$3,388
    Apr
  • MXN$5,581
    May
  • MXN$4,611
    Jun
  • MXN$4,225
    Jul
  • MXN$5,428
    Aug
  • MXN$3,869
    Sep
  • MXN$4,418
    Oct

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 Monday as prices are typically highest on that day.

MXN$6,627
MXN$5,310
MXN$3,992
MXN$2,675
  • MXN$6,627
    Mon
  • MXN$3,992
    Tue
  • MXN$4,307
    Wed
  • MXN$4,795
    Thu
  • MXN$4,206
    Fri
  • MXN$6,573
    Sat
  • MXN$4,281
    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 Alaska Airlines (from MXN$1,808) among 7 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Alaska Airlines
From MXN$1,808
Delta Air Lines
From MXN$1,881
Frontier Airlines
From MXN$1,890
American Airlines
From MXN$2,048
Hahn Air
From MXN$2,500
United Airlines
From MXN$2,842
Sun Country Airlines
From MXN$6,473

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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. AS314

    08:22

    SEA

    4h 3m

    14:25

    STL

    S M T W T F S
    Search
  2. DL949

    18:00

    SEA

    3h 21m

    Direct

    23:21

    MSP

    S - - - - - S
    Search
  3. DL1609

    21:45

    MSP

    1h 33m

    Direct

    23:18

    STL

    S - - - - - -
  4. DL1128

    05:45

    SEA

    2h 6m

    Direct

    08:51

    SLC

    S M T W T F S
    Search
  5. DL2455

    09:30

    SLC

    2h 53m

    Direct

    13:23

    STL

    S M T W T F S
  6. DL536

    08:25

    SEA

    3h 23m

    Direct

    13:48

    MSP

    S M T W T F S
    Search
  7. DL1839

    15:03

    MSP

    1h 31m

    Direct

    16:34

    STL

    S - - - - - -
  8. DL943

    06:05

    SEA

    3h 27m

    Direct

    11:32

    MSP

    S M T W T F S
    Search
  9. DL5165

    12:52

    MSP

    1h 39m

    Direct

    14:31

    STL

    S - - - - - -
  10. AA717

    14:07

    SEA

    4h 1m

    Direct

    20:08

    DFW

    S M T W T F S
    Search
  11. AA1010

    20:09

    DFW

    1h 50m

    Direct

    21:59

    STL

    S M T W T F S
  12. DL810

    23:05

    SEA

    4h 21m

    Direct

    06:26

    DTW

    S M T W T F S
    Search
  13. DL2868

    09:10

    DTW

    1h 39m

    Direct

    09:49

    STL

    S M T W T F S
  14. DL943

    06:05

    SEA

    3h 27m

    Direct

    11:32

    MSP

    S M T W T F S
    Search
  15. DL1839

    15:03

    MSP

    1h 31m

    Direct

    16:34

    STL

    S - - - - - -
  16. DL812

    06:00

    SEA

    4h 15m

    Direct

    13:15

    DTW

    S M T W T F S
    Search
  17. DL2822

    16:10

    DTW

    1h 40m

    Direct

    16:50

    STL

    S - - - - - 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 MXN$1,517
Cheapest return ticket price MXN$3,011

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 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 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 09:40, and the last departs at 18:03, 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 Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) is quite popular. Without considering departure times or holidays, tickets cost around MXN$5,716 in December, 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 MXN$1,517, and round-trip fares start from MXN$3,011. 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 23 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 MXN$4,087. Prices may vary depending on the departure date, airline, and availability.
  • Seattle-Tacoma International Airport to St. Louis Lambert International Airport operates around 14 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.

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 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.