Cheap flights from St. Louis to Seattle

Flights overview

Useful information for finding cheap flights from St. Louis to Seattle and booking your next trip
Cheapest round-trip flights $181
Southwest 1 stop 9 hr Sat, Apr 25 — Sat, May 2
The cheapest round-trip flight from St. Louis to Seattle is currently $181
Cheapest one-way flight $91
Southwest 1 stop 8 hr Wed, Apr 22
The cheapest one-way flight from St. Louis to Seattle is currently $91
Cheapest nonstop flights $217
Alaska Nonstop 5 hr Sat, Apr 4 — Sat, Apr 11
The cheapest nonstop round-trip flight from St. Louis to Seattle is currently $217
Last-minute weekend getaway $400
Frontier 1 stop 24 hr Thu, Mar 12 — Mon, Mar 16
The cheapest last-minute weekend getaway from St. Louis to Seattle is currently $400
Cheapest business class flights $424
Frontier 1 stop 16 hr Sat, Apr 25 — Sun, May 3
The cheapest business class round-trip flight from St. Louis to Seattle is currently $424
Fastest flight 4 hr 15 min The fastest nonstop flight from St. Louis to Seattle takes 4 hr 15 min
Nonstop flights Every day There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from St. Louis to Seattle is typically September. The most expensive month to fly is typically July.
September
Cheapest
Typical prices: $145–240
July
Most expensive
Typical prices: $220–360

Popular airlines from St. Louis to Seattle

  • Alaska
    Nonstop
    from $217
    Typical price: $245–550
    11 weekly nonstop flights
    STL - SEA Every day
  • Southwest
    from $182
    Typical price: $220–490
    367 weekly connecting flights
    STL - SEA Every day
  • Delta
    from $249
    Typical price: $220–600
    245 weekly connecting flights
    STL - SEA Every day
  • American
    from $243
    Typical price: $225–500
    233 weekly connecting flights
    STL - SEA Every day
  • United
    from $249
    Typical price: $230–500
    201 weekly connecting flights
    STL - SEA Every day
  • Frontier
    from $190
    Typical price: $195–485
    20 weekly connecting flights
    STL - SEA Every day

Popular airports near St. Louis

  • St. Louis Lambert International Airport (STL)
    St. Louis United States 21 min 12 mi
  • General Wayne A. Downing Peoria International Airport (PIA)
    Peoria United States 2 hr 35 min 143 mi
  • Columbia Regional Airport (COU)
    Columbia United States 2 hr 7 min 109 mi
  • MidAmerica St. Louis Airport (BLV)
    Belleville United States 34 min 20 mi

Popular airports near Seattle

  • Seattle-Tacoma International Airport (SEA)
    Seattle United States 18 min 11 mi
  • Paine Field (PAE)
    Everett United States 31 min 21 mi
  • King County International Airport - Boeing Field (BFI)
    Seattle United States 11 min 5 mi
  • Portland International Airport (PDX)
    Portland United States 2 hr 44 min 140 mi

Frequently asked questions about flying from St. Louis to Seattle

The cheapest flights from St. Louis to Seattle are usually in September. Typical ticket prices in September range from $145 to $240.
The cheapest round-trip flight from St. Louis to Seattle recently found on Google Flights was with Southwest from $181. The cheapest one-way flight was with Southwest from $91.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Alaska flight from St. Louis to Seattle is $217, flying from Apr 4 to Apr 11.
  • The cheapest Southwest flight from St. Louis to Seattle is $182, flying from May 2 to May 9.
  • The cheapest Delta flight from St. Louis to Seattle is $249, flying from Apr 23 to Apr 29.
  • The cheapest American flight from St. Louis to Seattle is $243, flying from Apr 2 to Apr 8.
  • The cheapest United flight from St. Louis to Seattle is $249, flying from May 1 to May 7.
  • The cheapest Frontier flight from St. Louis to Seattle is $190, flying from Apr 24 to May 3.
The cheapest round-trip flight from St. Louis to Seattle starts at $181 from Sat, Apr 25 to Sat, May 2. The cheapest one-way flight starts at $91 and departs on Wed, Apr 22.
4 hr 15 min is the shortest flight time from St. Louis to Seattle.
Most visitors come May–Sep, a period encompassing events such as the Seattle International Film Festival (May); Seafair (Jul), a summer festival including boat races, marathons and parades; and Bumbershoot (Sep), an international music and arts festival. Rainy season is Nov–May, though rain is possible year-round.
It's easy to use Google Flights to find the cheapest days to fly from St. Louis to Seattle.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.
What counts as the best airline for your flights from St. Louis to Seattle really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from St. Louis to Seattle.

In terms of nonstop flights, Alaska is the most popular. Alaska offers 11 nonstop flights per week. Alaska flies from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) .

In terms of flights, Southwest is the most popular. Southwest offers 367 connecting flights per week. Southwest flies from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) .

Other popular airlines flying from St. Louis to Seattle are:
  • Delta offers 245 connecting flights per week. Delta flies from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) .
  • American offers 233 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) .
  • United offers 201 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) .
  • Frontier offers 20 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) .
The number of connecting flights refers to distinct flights with at least one stop between St. Louis and Seattle.
The cheapest round-trip flight from St. Louis to Seattle recently found on Google Flights was with Southwest from $181. The cheapest one-way flight was with Southwest from $91.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Alaska flight from St. Louis to Seattle is $217, flying from Apr 4 to Apr 11.
  • The cheapest Southwest flight from St. Louis to Seattle is $182, flying from May 2 to May 9.
  • The cheapest Delta flight from St. Louis to Seattle is $249, flying from Apr 23 to Apr 29.
  • The cheapest American flight from St. Louis to Seattle is $243, flying from Apr 2 to Apr 8.
  • The cheapest United flight from St. Louis to Seattle is $249, flying from May 1 to May 7.
  • The cheapest Frontier flight from St. Louis to Seattle is $190, flying from Apr 24 to May 3.
Alaska flies direct from St. Louis to Seattle.
  • There are 11 Alaska direct flights from St. Louis to Seattle per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
The cheapest last-minute deal between St. Louis and Seattle at price $400 is offered by Frontier from Thu, Mar 12 to Mon, Mar 16.
Alaska flies direct from St. Louis to Seattle.
  • There are 11 Alaska direct flights from St. Louis to Seattle per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
There are direct flights from St. Louis to Seattle on a daily basis.
The cheapest direct (nonstop) round-trip flights between St. Louis and Seattle start at $217 from Sat, Apr 4 to Sat, Apr 11 with Alaska.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from St. Louis to Seattle, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.
The cheapest business class round-trip flights between St. Louis and Seattle start at $424 from Sat, Apr 25 to Sun, May 3 with Frontier.
The cheapest economy class round-trip flights between St. Louis and Seattle start at $181 from Sat, Apr 25 to Sat, May 2.
To book business class trips from St. Louis to Seattle, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.
The best last-minute getaway deal for the next weekend between St. Louis and Seattle starts at $400 from Thu, Mar 12 to Mon, Mar 16 with Frontier.
The cheapest last-minute deal between St. Louis and Seattle at price $400 is offered by Frontier from Thu, Mar 12 to Mon, Mar 16.
To find last-minute flight deals from St. Louis to Seattle, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.

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