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Cheap flights from St Louis to Seattle (STL - SEA)

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The best prices from St Louis to Seattle are usually found in July or January, booked 35 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

How to find the cheapest flight from
St Louis (STL) to Seattle (SEA)

STL - SEA
Price
$246 - $317
SEA
Temperature
46.4 - 77 °F
SEA
Rainfall
0.7 - 6.5 inches

Popular in

December

High demand for flights, 13% potential price rise

Cheapest in

July

Best time to find cheap flights, 11% potential price drop

Round-trip from

$246

From St Louis to Seattle

One-way from

$119

One-way flight from St Louis to Seattle

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from St Louis to Seattle?

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 16% on the overall cost on flights from St Louis to Seattle.

How far in advance should I book a flight from St Louis to Seattle?

Find a great deal and save up to 60% by booking at least 58 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St Louis to Seattle within the next two weeks, with the cheapest ticket starting at $385.

When is the cheapest time to fly from St Louis to Seattle (STL - SEA)?

One of the essential ways to save on airfare from St Louis to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 22% on airfare.

Cheap flights from St Louis to Seattle in November, December 2020

The best prices found for STL to SEA flights for November, December
11 Dec - 3 Jan
$68pp
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
10 Dec - 13 Dec
$78pp
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
11 Dec - 13 Dec
$84pp
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis

St Louis to Seattle 2021 flight deals

Cheap flights to Seattle from St Louis found for next year
11 Dec - 3 Jan
$68pp
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
10 Dec - 13 Dec
$78pp
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
11 Dec - 13 Dec
$84pp
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis

Non-stop flights to Seattle from St Louis

Save time with St Louis to Seattle direct flight deals
6 Jan - 9 Jan
$217pp
STL
Lambert-St Louis
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
STL
Lambert-St Louis
6 Jan - 11 Jan
$227pp
STL
Lambert-St Louis
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
STL
Lambert-St Louis
21 Jan - 25 Jan
$237pp
STL
Lambert-St Louis
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
STL
Lambert-St Louis

Last minute flights from St Louis to Seattle

Late deals on round-trip flights to Seattle from St Louis, departing today and this week
3 Dec - 6 Dec
$123pp
STL
Lambert-St Louis
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
2 Dec - 28 Jan
$177pp
STL
Lambert-St Louis
Frontier
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis
2 Dec - 24 Jan
$183pp
STL
Lambert-St Louis
Frontier
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
STL
Lambert-St Louis

One-way flights to Seattle from St Louis

The cheapest one-way flights from St Louis to Seattle
9:10 am - 11:35 am
Alaska Airlines
Nonstop
4h 25m
STL - SEA
Alaska Airlines
10:39 am - 4:09 pm
American Airlines
1 Stop
7h 30m
STL - SEA
American Airlines
2:00 am - 10:51 am
Major Airline
2 Stops
10h 51m
STL - SEA
Major Airline
$135
StudentUniverse

Related info for your journey

Useful info, stats and facts about St Louis to Seattle flights.

Flight FAQs

From St Louis to Seattle

Are flight prices decreasing from St Louis to Seattle due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both St Louis and Seattle for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from Lambert-St Louis to Seattle/Tacoma Intl to control the spread of COVID-19?

New policies can now be found on Alaska Airlines, Southwest, and Delta to help keep travelers safe while flying. New policies for travelers booking flights from Lambert-St Louis to Seattle/Tacoma Intl include masks being provided and required on board, daily cleaning and sanitization, use of HEPA filters, pre-flight testing for antibodies and symptoms, and socially distanced seating (for a limited time). Keep in mind that policies will vary by airline.

Which airlines flying from Lambert-St Louis to Seattle/Tacoma Intl have flexible cancellations due to COVID-19?

Some of our airline partners flying from Lambert-St Louis to Seattle/Tacoma Intl have new flexible policies in place due to COVID-19. Alaska Airlines, United Airlines, and Delta are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Alaska Airlines with this kind of flexibility.

Can I find flights from St Louis to Seattle for under $100 on Cheapflights?

Yes, there are multiple flights from St Louis to Seattle for under $100. The cheapest flight booked recently is on Frontier for just $68, but on average you can expect to pay $142.

Are there nonstop flights from St Louis to Seattle for under $300 on Cheapflights?

Cheapflights has at least 20 direct flights from St Louis to Seattle under $300. A good price for a nonstop flight from St Louis to Seattle is less than $324.

Are there last-minute flights available from St Louis to Seattle for under $200?

There are currently 20+ open flights from St Louis to Seattle within the next 7 days for less than $200.

What days are nonstop flights available from St Louis to Seattle?

Nonstop flights are available for this route on the following days: Wednesday, Saturday.

How many flights depart from St Louis to Seattle on average per day?

Per day, 2 flights depart from Lambert-St Louis to Seattle/Tacoma Intl on average.
Afternoon (Noon - 6pm) - 100% of flight departures

Does it rain more in St Louis or Seattle?

When traveling, we recommend packing in preparation to handle common weather conditions. The rainfall in St Louis is typically less than Seattle. We can gather that this will continue over the next 12 days.

Is St Louis weather warmer or cooler than Seattle?

Expect the weather to be around 90 °F on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Seattle is generally colder than in St Louis.

How long is the flight from St Louis to Seattle?

There are many flights that can get you from St Louis to Seattle in 9h 26m. Fly via Frontier to get the fastest option. The distance from St Louis to Seattle is about 1714 mi.

What is the cheapest airline to fly from St Louis to Seattle round-trip?

Cheapflights users have booked flights from St Louis to Seattle round-trip from $68. Frontier is currently priced 75% below the average price you’ll pay for this route.

What are the cheapest airlines to fly from St Louis to Seattle one-way?

The cheapest airlines for a one-way flight from St Louis to Seattle are Frontier ($34), Alaska Airlines ($109), and American Airlines ($112).

Alternative routes for St Louis to Seattle

Destination information for Seattle

Things to know before you go. Useful info for your trip from St Louis to Seattle
Average temperature for November in Seattle
51.8 °F
Avg rainfall for November in Seattle
6.5 ″

Airports servicing St. Louis

Airports servicing Seattle

Top 7 airlines from St Louis to Seattle

The chart below displays the airlines Cheapflights users traveling from St Louis to Seattle choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.

Airline Cheapest Average Flexibility On-time COVID-19 safety
Sun Country Air
$134 $241 N/A 83%
Frontier
$113 $242 No cancel fee 62%
Delta
$117 $289 No cancel fee N/A
United Airlines
$127 $312 No cancel fee 69%
American Airlines
$127 $338 No cancel fee 71%
Alaska Airlines
$148 $342 No cancel fee 75%
Southwest
$266 $641 No cancel fee 63%

Hourly flight availability from St Louis to Seattle

Afternoon Noon to 6 PM 63% of STL to SEA departures
Morning 6 AM to noon 36% of STL to SEA departures
Early morning Midnight to 6 AM 1% of STL to SEA departures
Evening 6 PM to midnight 0% of STL to SEA departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from St Louis to Seattle
Sunday
1 daily flight
Monday
0 flights
Tuesday
0 flights
Wednesday
0 flights
Thursday
0 flights
Friday
1 daily flight
Saturday
3 daily flights
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