Find Cheap Flights from Seattle to St. Louis (SEA - STL)

Flights overview

Useful information for finding cheap flights from Seattle to St. Louis and booking your next trip

Cheapest round-trip flights	$200	Frontier 1 stop 15 hr Fri, Apr 17 — Fri, Apr 24	The cheapest round-trip flight from Seattle to St. Louis is currently $200
Cheapest one-way flight	$91	Southwest 1 stop 8 hr Wed, Apr 22	The cheapest one-way flight from Seattle to St. Louis is currently $91
Cheapest nonstop flights	$277	Alaska Nonstop 4 hr Thu, Apr 16 — Wed, Apr 22	The cheapest nonstop round-trip flight from Seattle to St. Louis is currently $277
Last-minute weekend getaway	$516	Frontier 1 stop 12 hr Thu, Mar 12 — Mon, Mar 16	The cheapest last-minute weekend getaway from Seattle to St. Louis is currently $516
Cheapest business class flights	$428	Frontier 1 stop 15 hr Fri, Apr 17 — Sat, Apr 25	The cheapest business class round-trip flight from Seattle to St. Louis is currently $428

Fastest flight	3 hr 50 min	The fastest nonstop flight from Seattle to St. Louis takes 3 hr 50 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 Seattle to St. Louis is typically October. The most expensive month to fly is typically July.

October Cheapest	Typical prices: $145–240
July Most expensive	Typical prices: $215–350

Popular airlines from Seattle to St. Louis

Alaska

Nonstop

from $327

Typical price: $245–540

11 weekly nonstop flights

SEA - STL Every day
Southwest

from $181

Typical price: $215–490

420 weekly connecting flights

SEA - STL Every day
Delta

from $215

Typical price: $220–580

262 weekly connecting flights

SEA - STL Every day
United

from $243

Typical price: $235–490

245 weekly connecting flights

SEA - STL Every day
American

from $237

Typical price: $220–495

234 weekly connecting flights

SEA - STL Every day
Frontier

from $200

Typical price: $190–495

22 weekly connecting flights

SEA - STL Every day

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

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

Frequently asked questions about flying from Seattle to St. Louis

The cheapest flights from Seattle to St. Louis are usually in October. Typical ticket prices in October range from $145 to $240.

The cheapest round-trip flight from Seattle to St. Louis recently found on Google Flights was with Frontier from $200. 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 Seattle to St. Louis is $327, flying from May 28 to Jun 3.
The cheapest Southwest flight from Seattle to St. Louis is $181, flying from Apr 25 to May 2.
The cheapest Delta flight from Seattle to St. Louis is $215, flying from Apr 30 to May 6.
The cheapest United flight from Seattle to St. Louis is $243, flying from Apr 25 to May 2.
The cheapest American flight from Seattle to St. Louis is $237, flying from Apr 18 to Apr 25.
The cheapest Frontier flight from Seattle to St. Louis is $200, flying from Apr 17 to Apr 24.

The cheapest round-trip flight from Seattle to St. Louis starts at $200 from Fri, Apr 17 to Fri, Apr 24. The cheapest one-way flight starts at $91 and departs on Wed, Apr 22.

3 hr 50 min is the shortest flight time from Seattle to St. Louis.

Apr–Sep is the most popular time to visit, coinciding with hot, humid summer and events like Fair St. Louis, a huge Fourth of July festival at Forest Park, and the Taste of St. Louis food festival (Sep). Weather in winter is cold, with occasional snow.

It's easy to use Google Flights to find the cheapest days to fly from Seattle to St. Louis.
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 Seattle to St. Louis 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 Seattle to St. Louis.

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

In terms of flights, Southwest is the most popular. Southwest offers 420 connecting flights per week. Southwest flies from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) .

Other popular airlines flying from Seattle to St. Louis are:

Delta offers 262 connecting flights per week. Delta flies from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) .
United offers 245 connecting flights per week. United flies from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) .
American offers 234 connecting flights per week. American flies from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) .
Frontier offers 22 connecting flights per week. Frontier flies from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert International Airport (STL) .

The number of connecting flights refers to distinct flights with at least one stop between Seattle and St. Louis.

The cheapest round-trip flight from Seattle to St. Louis recently found on Google Flights was with Frontier from $200. 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 Seattle to St. Louis is $327, flying from May 28 to Jun 3.
The cheapest Southwest flight from Seattle to St. Louis is $181, flying from Apr 25 to May 2.
The cheapest Delta flight from Seattle to St. Louis is $215, flying from Apr 30 to May 6.
The cheapest United flight from Seattle to St. Louis is $243, flying from Apr 25 to May 2.
The cheapest American flight from Seattle to St. Louis is $237, flying from Apr 18 to Apr 25.
The cheapest Frontier flight from Seattle to St. Louis is $200, flying from Apr 17 to Apr 24.

Alaska flies direct from Seattle to St. Louis.

There are 11 Alaska direct flights from Seattle to St. Louis 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 Seattle and St. Louis at price $516 is offered by Frontier from Thu, Mar 12 to Mon, Mar 16.

Alaska flies direct from Seattle to St. Louis.

There are 11 Alaska direct flights from Seattle to St. Louis 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 Seattle to St. Louis on a daily basis.

The cheapest direct (nonstop) round-trip flights between Seattle and St. Louis start at $277 from Thu, Apr 16 to Wed, Apr 22 with Alaska.

It's easy to find nonstop flights with Google Flights! Once you've searched for flights from Seattle to St. Louis, 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 Seattle and St. Louis start at $428 from Fri, Apr 17 to Sat, Apr 25 with Frontier.

The cheapest economy class round-trip flights between Seattle and St. Louis start at $200 from Fri, Apr 17 to Fri, Apr 24.

To book business class trips from Seattle to St. Louis, 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 Seattle and St. Louis starts at $516 from Thu, Mar 12 to Mon, Mar 16 with Frontier.

The cheapest last-minute deal between Seattle and St. Louis at price $516 is offered by Frontier from Thu, Mar 12 to Mon, Mar 16.

To find last-minute flight deals from Seattle to St. Louis, 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.