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Cheap Flights from St Louis to Seattle, WA, United States - STL to SEA Last modified: May 29, 2016 8:07 AM

Popular flights from St Louis to Seattle Last modified: May 29, 2016 8:07 AM

We’ve got the inside scoop on finding the best time to fly for the best price. Not sure when to travel for your next vacation? Find details below on when-to-fly and when-to-buy.

Alaska Airlines
Departure Date Return Date Lowest Price
Aug 17, 2016 Aug 24, 2016 $347
Aug 27, 2016 Sep 1, 2016 $347
Aug 27, 2016 Sep 1, 2016 $347
Aug 30, 2016 Sep 1, 2016 $347
Sep 2, 2016 Sep 11, 2016 $347
American Airlines
Departure Date Return Date Lowest Price
Aug 17, 2016 Aug 24, 2016 $347
Aug 27, 2016 Sep 1, 2016 $347
Aug 27, 2016 Sep 1, 2016 $347
Aug 30, 2016 Sep 1, 2016 $347
Sep 2, 2016 Sep 4, 2016 $347
Frontier Airlines
Departure Date Return Date Lowest Price
Sep 13, 2016 Sep 15, 2016 $261
Sep 20, 2016 Oct 10, 2016 $261
Sep 23, 2016 Oct 1, 2016 $261
United Airlines
Departure Date Return Date Lowest Price
Aug 23, 2016 Aug 30, 2016 $372
Aug 23, 2016 Sep 6, 2016 $372
Aug 24, 2016 Aug 29, 2016 $372
Aug 25, 2016 Aug 30, 2016 $372
Aug 27, 2016 Sep 1, 2016 $372

How Much Does it Cost to Fly from St Louis to Seattle (STL to SEA)?

We have collected flight cost data from across the web for travel from St Louis to Seattle, and have found the average flight price for this trip to be $368.

When Can I Buy the Cheapest Flight from St Louis to Seattle (STL to SEA)?

Airlines can adjust prices for plane tickets from St Louis to Seattle based on the day and time that you decide to book your flight. We have collected data from all airlines, and have discovered that the best days to book flights are Tuesdays, Wednesdays, and Saturdays. Read our article to find more information about the best time to buy airline tickets.

How far in advance should you book flights from St Louis to Seattle

The chart below shows up-to-date information regarding how far in advance a flight from St Louis to Seattle should be booked.

Non Stop versus 1-Stop
Advanced PurchaseNon StopOne Stop
< 7 days $532 $505
7-14 days $477 $439
14-21 days $402 $393
21-30 days $427 $380
30-60 days $397 $380
60-90 days $347 $355
90+ days $347 $261

Cheapest Day To Fly from St Louis to Seattle

The chart below shows up-to-date information regarding the cheapest days to fly from St Louis to Seattle.

Monday Tuesday Wednesday Thursday Friday Saturday Sunday
$390 $359 $347 $359 $380 $347 $390

Lowest Fares Chart By Month from St Louis to Seattle

The chart below shows the lowest fare by month when flying from St Louis to Seattle.

Month Origin Destination Carrier Depart Date Return Date Stops Price
June St Louis Seattle American 6/28/16 7/3/16 1 $380
July St Louis Seattle American 7/12/16 7/20/16 1 $380
August St Louis Seattle Frontier 8/30/16 9/1/16 1 $344
September St Louis Seattle Frontier 9/13/16 9/15/16 1 $261
October St Louis Seattle Frontier 10/6/16 10/11/16 1 $261
November St Louis Seattle American 11/2/16 11/5/16 0 $347
December St Louis Seattle American 12/23/16 12/30/16 1 $380
February St Louis Seattle American 2/3/17 2/15/17 0 $347

Cheapest Weekend Non-Stop Flights for the Next 30 Days from St Louis to Seattle

If you're ready to take a trip in the next 30 days and want to fly on the weekend, you might be wondering which weekend is the cheapest to fly. The chart below shows up-to-date data regarding weekend flight prices from St Louis to Seattle.

Next 30 Days

SunMonTueWedThuFriSat
5 6 7 8 9 10 11
$532
12 13 14 15 16 17 18
$532 $402
19 20 21 22 23 24 25
$402 $557
26 27 28 29 30 1 2
$557 $577
3 4 5 6 7 8 9
$577
TIPSave $37 by flying into Portland instead of Seattle from St Louis

Non-Stop vs Connecting Flights from St Louis to Seattle (STL to SEA)

Your St Louis to Seattle flight can be significantly cheaper by choosing a multi-stop airline ticket. Although these connecting flights sacrifice some convenience, on average, travelers save 20%-60% when they choose to fly multi-stop versus a direct flight.

The average price for connecting flights from St Louis to Seattle is $370.

The average price for non-stop flights from St Louis to Seattle is $347.

The chart below shows up to date information regarding non-stop flights from St Louis to Seattle.

Nonstop Flight Details from St Louis to Seattle
CarrierMonTueWedThuFriSatSunEarliest FlightLatest Flight
Alaska 2 2 2 2 2 2 2 07:00 18:30

Round Trip vs One Way Flights from St Louis to Seattle (STL to SEA)

We have found that there is often no price difference between buying a round trip flight versus a one way flight. Increased flexibility is the main benefit when it comes to buying a one way flight from St Louis to Seattle. However, booking a round trip flight can be a simpler process. You can compare round trip and one way flights by using our flight comparison.

The average price for one way flights from St Louis to Seattle is $185.

The average price for round trip flights from St Louis to Seattle is $365.

More Cheap Flights

FlightsAirlineLowest Price
Springfield to Seattle American, Alaska, United $360
Moline to Seattle American, Alaska, United $362
Peoria to Seattle American, United $362
Evansville to Seattle American, United $412
Bloomington - Normal to Seattle American $386
Springfield to Seattle American, United $432
Champaign to Seattle American $447
St Louis to Portland American, Alaska, Frontier, United $261
St Louis to Vancouver American, Air Canada, Alaska, Frontier, United, WestJet $345
St Louis to Las Vegas American, Alaska, Frontier, United $108
St Louis to Victoria American, Air Canada, Alaska, United, WestJet $591
St Louis to Los Angeles American, Alaska, Frontier, United $244
St Louis to San Francisco American, Alaska, Frontier, United $244
Springfield to Portland American, Alaska, United $447
Moline to Portland American, Alaska, United $375
St Louis to Bellingham American, Alaska, United Check Dates
Bloomington - Normal to Portland American $430
Springfield to Vancouver American, Air Canada, Alaska, United, WestJet $524
St Louis to Chicago American, Alaska, United $219
Moline to Vancouver American, Air Canada, Alaska, Allegiant, United, WestJet $428
St Louis to Dallas - Ft Worth American, Alaska, United $209
Peoria to Vancouver American, Air Canada, United, WestJet $600
Peoria to Portland American, United $412
Evansville to Portland American, United $445
St Louis to Denver American, Alaska, Frontier, United $108
St Louis to Phoenix American, Alaska, Frontier, United $244
St Louis to Wenatchee Alaska $498
St Louis to Atlanta American, Alaska, Frontier, United $78
Champaign to Portland American $452
Springfield to Portland American, United $480

Airlines Flying from St Louis to Seattle (STL to SEA) Number of flights searched: 235Last modified: May 29, 2016 8:07 AM

Below are the different airlines that fly from St Louis to Seattle with the average price of their plane tickets. Just remember that different airlines offer different levels of comfort and service, so consider convenience when choosing your airline.

Below is the full flight schedule summary of the next 30 days for flights from St Louis to Seattle.

St Louis to Seattle
Airline Connections Mon Tue Wed Thu Fri Sat Sun
American LAX X X X X X X X
Alaska - X X X X X X X
Alaska PDX X X X X X X X
Delta DTW X X X X X X X
Frontier DEN X X X X
United SFO X X X X X X X
Southwest - X X X X X X X
Southwest MDW X X X X X X X

Airports for Your Route

These pages contain information about the major airports in St Louis and Seattle, so you can feel comfortable knowing how to get around whether you are about to take off or you just landed.

St Louis to Seattle Flight Questions

Below are some common questions that asked about this flight route:

Question: How long is a direct flight from St Louis to Seattle?
Answer: The average St Louis to Seattle flight time is 4 hours and 20 minutes.
Question: How many miles are there between St Louis and Seattle?
Answer: The distance from St Louis to Seattle is 1704 miles.
Question: How common are direct flights from St Louis to Seattle?
Answer: There are 14 direct flights from St Louis to Seattle.
Question: What is the most popular airline for non-stop flights from St Louis to Seattle?
Answer: Alaska Airlines provides 100% of the non-stop flights between St Louis and Seattle.
Question: What are the most popular connecting cities when flying from St Louis to Seattle?
Answer: Denver, CO
St Louis (STL) To Seattle, WA (SEA) Flights: Cheap Flights From St Louis To Seattle | FareCompare.