Cheap flights from St. Louis to Seattle

Lambert-St. Louis
STL
Seattle-Tacoma
SEA

Flight deals from St. Louis to Seattle

Below you can see the best deals on flights St. Louis — Seattle for upcoming dates. Direct and connecting flights from various airlines — compare prices and choose the right ticket.

The lowest price for the next 2 months is on 15 September, from $81.

Top 10 cheap flights from St. Louis to Seattle

DL
DL
$ 81

St. Louis — Seattle

18:55—23:59
21 Sep 2026
7 h 4 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

18:55—23:59
18 Sep 2026
7 h 4 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

08:00—14:50
16 Sep 2026
8 h 50 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

18:55—23:59
17 Sep 2026
7 h 4 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

14:25—18:36
15 Sep 2026
6 h 11 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

17:47—23:55
15 Sep 2026
8 h 8 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

06:40—14:49
15 Sep 2026
10 h 9 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

14:25—18:36
23 Sep 2026
6 h 11 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

13:55—22:05
23 Sep 2026
10 h 10 m
1 stop
DL
DL
$ 81

St. Louis — Seattle

10:29—18:45
23 Sep 2026
10 h 16 m
1 stop

Prices were found in the last 72 hours and may change — check the exact price when you continue.

About the St. Louis — Seattle flight

Looking for cheap flights from St. Louis to Seattle? Compare fares from different airlines, check the flight schedule and travel time — and book your St. Louis — Seattle ticket online at the best price.

The route has direct flights — around 90 flights per week, flights are operated by Alaska Airlines, Hawaiian Airlines, American Airlines, Qatar Airways and 1 more airline, a nonstop flight takes about 3 h 58 min, the distance between the cities is around 2,775 km.

Planning your trip? You may find our Seattle travel guide, how to get from the airport into town and Seattle weather forecast useful. To catch a low fare, use the low-price calendar and the monthly price chart on this page.

Facts about this route

from $81Min. price
SeptemberCheapest
AugustPeak season
YesDirect flights
2,775 kmDistance
3 h 58 minTravel time
5Airlines
90 / wkFlights

Flight schedule from St. Louis to Seattle

The table shows direct flights from St. Louis to Seattle on the selected date. The flight takes approximately 3 h 58 min. Regular flights are operated by Alaska Airlines, Hawaiian Airlines, American Airlines and Qatar Airways. Departures from Lambert-St. Louis International Airport airports, arrivals at Seattle-Tacoma International Airport and Paine Field.

For each flight, the following details are shown: departure time (local), arrival city and airport, flight number and airline, terminal or gate, and status. Click on a flight to open its details and go to ticket search. To view flights on a different day, change the date above the table.

Today
Any time
Last update: 25 Aug 2026

Flight ticket prices by day: St. Louis — Seattle

Below is a calendar of the lowest flight ticket prices for St. Louis — Seattle by day. Pick a convenient date and instantly see the fare. The cheapest flights on this route start from $81 in September, and the most expensive are around $269 in August. If your travel dates are flexible, the calendar will help you find the best price for your preferred period. To view round-trip fares, switch to the "Round trip" tab above the calendar, select your departure date — and the right-hand calendar will highlight the lowest prices for return flights on each day.

 
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Prices by month

Average one-way fares from St. Louis to Seattle by month. Tickets are usually cheapest in February (around $141) and priciest in July (about $261) — use the table and chart below to pick the best time to fly.

MonthAverage priceLevelMonthAverage priceLevelMonthAverage priceLevel
Jan$152lowMay$218mediumSep$174low
Feb$141lowJun$239highOct$163low
Mar$163mediumJul$261highNov$218medium
Apr$196mediumAug$228highDec$250high

Some values are estimated based on seasonality.

When to fly

Weather in Seattle: it is warmest in August (up to 25 °C on average) and coolest in December (around 8 °C). The driest month is July.

Tickets are usually cheapest in September and most expensive in August. Compare prices and weather by month in the charts below to pick the best time to fly.

Temperature · Seattle

Dry and wet days · Seattle

Wind speed and direction · Seattle

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How to get the best deal on a St. Louis — Seattle ticket

  • Book ahead: fares for St. Louis — Seattle are usually lower 3–8 weeks before departure than at the last minute.
  • Play with your dates — Tuesday, Wednesday and Saturday departures are often cheaper than Friday and Sunday.
  • The cheapest month to fly to Seattle is usually September — plan your trip around it if your dates are flexible.
  • Compare direct and connecting flights: nonstop is faster, while a connection is sometimes noticeably cheaper.
  • Watch the low-price calendar and the monthly price trend on this page — they make it easier to catch a good date.
  • Travelling light? Pick a cabin-baggage-only fare — tickets without checked luggage are noticeably cheaper.
  • Get to the airport in good time — about 2–3 hours before an international departure and roughly an hour before a domestic one.

Airlines

Flights on the St. Louis — Seattle route are operated by 5 airlines; Alaska Airlines runs the most flights (around 51% of all flights). Compare carriers, flight shares and schedules below.

  • Alaska AirlinesAS
    15x/week
    WebsiteFleet: 31545M pax/year
    • Direct flight STL → SEA15x/week
      Duration
      4h 25m
      Days
      MTWTFSS
    51.1%Open →
  • Hawaiian AirlinesHA
    10x/week
    WebsiteFleet: 7511M pax/year
    • Direct flight STL → SEA10x/week
    34.4%
  • American AirlinesAA
    3x/week
    WebsiteFleet: 965211M pax/year
    • Direct flight STL → SEA3x/week
    11.1%Open →
  • Qatar AirwaysQR
    1x/week
    WebsiteFleet: 26640M pax/year
    • Direct flight STL → SEA1x/week
      Duration
      4h 31m
      Days
      MTWTFSS
    2.2%Open →
  • Japan AirlinesJL
    1x/week
    WebsiteFleet: 14540M pax/year
    • Direct flight STL → SEA1x/week
    1.1%Open →

Cities and airports on the St. Louis — Seattle route

Flights St. Louis — Seattle depart from Lambert-St. Louis International Airport and arrive at Seattle-Tacoma International Airport and Paine Field. Below are pages for the cities, countries, and airports on the route: airlines, schedules, and travel guides.

Departure

St. Louis

STL
United States
About the cityHow to get thereWeatherAll about the country United States
Arrival

Seattle

SEA
United States
About the cityHow to get thereWeatherAll about the country United States
Departure airports
Arrival airports

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Frequently asked questions about the St. Louis — Seattle flight

How long is the flight from St. Louis to Seattle?

A nonstop St. Louis — Seattle flight takes about 3 h 58 min — the distance between the cities is around 2,775 km.

How far is it from St. Louis to Seattle?

The distance from St. Louis to Seattle is about 2,775 km, which a nonstop flight covers in around 3 h 58 min.

Are there direct flights from St. Louis to Seattle?

Yes, there are nonstop flights St. Louis — Seattle — around 90 flights per week.

Which airlines fly from St. Louis to Seattle?

Airlines operating St. Louis — Seattle include Alaska Airlines, Hawaiian Airlines, American Airlines, Qatar Airways, Japan Airlines. See the full list with schedules in the "Airlines" section on this page.

Which airports do St. Louis — Seattle flights use?

Flights from St. Louis depart from Lambert-St. Louis International Airport, and arrive at Seattle-Tacoma International Airport, Paine Field. If a city has more than one airport, check which one your ticket uses before you travel.

How much is a ticket from St. Louis to Seattle?

The price of a St. Louis — Seattle ticket depends on your travel date, season and demand: it is usually cheapest to fly in September, and most expensive in August. Tickets typically cost between $81 and $269. Check the current lowest fare and low-price calendar on this page.

When is the best time to book flights St. Louis — Seattle?

Flights St. Louis — Seattle are usually cheaper when booked in advance — a few weeks before departure and away from peak dates; the most budget-friendly month to fly is September. Compare prices by month in the price trend chart on this page.

How can I find the cheapest flights from St. Louis to Seattle?

To catch a low fare St. Louis — Seattle, book a few weeks in advance, keep your dates flexible, and compare airlines and connecting options. The low-price calendar and monthly price chart on this page show the cheapest days and months at a glance: the most budget-friendly month to fly is usually September.

How early should I arrive at the airport?

For international flights, plan to be at the airport about 2–3 hours before departure, and around an hour before a domestic flight. Allow extra time during busy travel seasons and at large hubs, where check-in and security lines can be longer.

Where else you can fly from St. Louis

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ChicagoDallasNew York CityAtlantaMinneapolisTorontoDenverHoustonCharlotteWashington, D.C.DetroitBostonPortlandOrlandoPhoenixPhiladelphiaSalt Lake CityMontrealMiamiLos AngelesLas VegasCancunFort LauderdaleJonesboroSan FranciscoLondonTampaFrankfurt am MainPunta CanaQuincyManhattan

Where else you can fly from Seattle

See all
Los AngelesAnchorageVancouverSan FranciscoPhoenixSan DiegoSan JoseSpokanePortlandSanta AnaNew York CityBoiseDenverChicagoDallasSalt Lake CitySacramentoLas VegasRedmondBostonAtlantaHonoluluWashington, D.C.MinneapolisPascoAustinBurbankFairbanksEugeneJuneauNashvilleHoustonCalgaryBozemanDetroitPalm SpringsMissoulaMedfordRenoOrlando

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