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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 NZD 187 and round-trip from NZD 287. Based on Trip.com's latest 7-day flight data.

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 NZD 394. In contrast, June is typically the most expensive month, with average prices reaching NZD 1,061.

NZD 1,061
NZD 728
NZD 394
NZD 61
    Cheapest
  • NZD 1,061
    Jun
  • NZD 797
    Jul
  • NZD 698
    Aug
  • NZD 425
    Sep
  • NZD 593
    Oct
  • NZD 570
    Nov
  • NZD 439
    Dec
  • NZD 467
    Jan
  • NZD 394
    Feb
  • NZD 533
    Mar
  • NZD 502
    Apr
  • NZD 875
    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.

NZD 484
NZD 412
NZD 339
NZD 267
  • NZD 414
    Mon
  • NZD 339
    Tue
  • NZD 484
    Wed
  • NZD 419
    Thu
  • NZD 371
    Fri
  • NZD 461
    Sat
  • NZD 463
    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 NZD 187) among 6 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Delta Air Lines
From NZD 187
American Airlines
From NZD 195
Frontier Airlines
From NZD 216
United Airlines
From NZD 245
Alaska Airlines
From NZD 247
Hahn Air
From NZD 248

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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

    2:15 PM

    STL

    3h 17m

    Nonstop

    4:32 PM

    SLC

    S M T - - - S
    Search
  2. DL871

    5:10 PM

    SLC

    2h 20m

    Nonstop

    6:30 PM

    SEA

    S M T W T F S
  3. DL5092

    12:31 PM

    STL

    1h 49m

    Nonstop

    2:20 PM

    MSP

    S M T - - - -
    Search
  4. DL877

    2:40 PM

    MSP

    3h 55m

    Nonstop

    4:35 PM

    SEA

    S M T W T F S
  5. AA2103

    8:29 AM

    STL

    2h 9m

    Nonstop

    10:38 AM

    DFW

    S M T W T F S
    Search
  6. AA717

    10:44 AM

    DFW

    4h 31m

    Nonstop

    1:15 PM

    SEA

    S M T W T F S
  7. AA2574

    7:56 AM

    STL

    3h 36m

    Nonstop

    10:32 AM

    PHX

    S M T W T F S
    Search
  8. AA2073

    11:30 AM

    PHX

    3h 21m

    Nonstop

    1:51 PM

    SEA

    S M T W T F S
  9. DL1492

    5:00 PM

    STL

    3h 26m

    Nonstop

    7:26 PM

    SLC

    S M T W T F S
    Search
  10. DL2998

    10:45 PM

    SLC

    2h 26m

    Nonstop

    12:11 AM

    SEA

    S M T - - - S
  11. AA2261

    5:00 AM

    STL

    2h 8m

    Nonstop

    7:08 AM

    DFW

    S M T W T F S
    Search
  12. AA767

    8:39 AM

    DFW

    4h 33m

    Nonstop

    11:12 AM

    SEA

    S M T W T F S
  13. AA1926

    7:24 AM

    STL

    1h 36m

    Nonstop

    9:00 AM

    ORD

    S M T W T F S
    Search
  14. AA2398

    11:30 AM

    ORD

    4h 50m

    Nonstop

    2:20 PM

    SEA

    S M T W T F S
  15. AA2897

    10:21 AM

    STL

    2h 4m

    Nonstop

    12:25 PM

    DFW

    S M T W T F S
    Search
  16. AA727

    2:25 PM

    DFW

    4h 29m

    Nonstop

    4:54 PM

    SEA

    S M T W - F S
  17. DL1839

    5:29 PM

    STL

    1h 42m

    Nonstop

    7:11 PM

    MSP

    S M T - - - -
    Search
  18. DL505

    9:50 PM

    MSP

    4h 3m

    Nonstop

    11:53 PM

    SEA

    S M T - - - S
  19. DL2363

    7:30 AM

    STL

    3h 23m

    Nonstop

    9:53 AM

    SLC

    S M T W T F S
    Search
  20. DL2921

    1:20 PM

    SLC

    2h 23m

    Nonstop

    2:43 PM

    SEA

    S M T - - - 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 NZD 187
Cheapest return ticket price NZD 287

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 NZD 766 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 NZD 187, and round-trip fares start from NZD 287. 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 NZD 404. 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.

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.