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

STL — SEA
Dec 13 — Dec 201

The best prices from Lambert-St Louis to Seattle/Tacoma Intl are usually found in January or February, booked 29 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

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

All the information you need to plan the best STL to SEA flight in 2022: compare St. Louis to Seattle flight prices with the expected peak season, weather and rainfall in Seattle.

STL - SEA

Price

$248 - $668

SEA

Temperature

41 - 66.2 °F

SEA

Rainfall

0.7 - 6.6 inches

Popular inJulyHigh demand for flights, 39% potential price rise
Cheapest inJanuaryBest time to find cheap flights, 39% potential price drop
Round-trip from$248From Lambert-St Louis to Seattle/Tacoma Intl
One-way from$157One-way flight from Lambert-St Louis to Seattle/Tacoma Intl

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

Leaving on a Monday 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 22% 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 24% by booking at least 28 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 $489.

What is the cheapest month to fly from St. Louis to Seattle?

Flights from St. Louis to Seattle lean towards being more expensive in July. Prices are generally better when you fly from St. Louis to Seattle in January, with the cheapest ticket starting at $160.

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

Unlike in the evening, when flights are generally more expensive, you can save up to 23% on flights from St. Louis to Seattle by exploring options for tickets in the afternoon.

Cheap flights from St. Louis to Seattle in December, January 2022

The best prices found for STL to SEA flights for December, January
Jan 5 - Jan 10
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

11h 47m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

16h 50m
$167

Multiple Airlines

Pick Dates

Deal found 12/6

Jan 5 - Jan 10
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

11h 47m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

16h 50m
$169

Multiple Airlines

Pick Dates

Deal found 12/7

Jan 15 - Jan 18
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

8h 48m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

22h 33m
$176

Frontier

Pick Dates

Deal found 12/7

St. Louis to Seattle 2022 flight deals

Cheap flights to Seattle from St. Louis found for this year
Dec 13 - Jan 5
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

7h 46m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

23h 08m
$180

Spirit Airlines

Pick Dates

Deal found 12/6

Dec 13 - Jan 5
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

7h 46m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

2 stops

12h 12m
$227

Multiple Airlines

Pick Dates

Deal found 12/6

Dec 14 - Jan 6
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

24h 48m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

14h 08m
$232

Frontier

Pick Dates

Deal found 12/8

Cheap United Airlines flights from St. Louis to Seattle

Dec 16 - Dec 29
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

9h 04m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

7h 17m
$515

United Airlines

Pick Dates

Deal found 12/6

Dec 16 - Dec 28
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

8h 37m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

18h 53m
$552

United Airlines

Pick Dates

Deal found 12/6

Cheap Frontier flights from St. Louis to Seattle

Jan 15 - Jan 18
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

8h 48m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

22h 33m
$176

Frontier

Pick Dates

Deal found 12/7

Jan 15 - Jan 19
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

8h 48m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

12h 28m
$187

Frontier

Pick Dates

Deal found 12/6

Jan 12 - Jan 17
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

8h 48m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

16h 50m
$189

Frontier

Pick Dates

Deal found 12/7

Non-stop flights to Seattle from St. Louis

Save time with St. Louis to Seattle direct flight deals
Feb 4 - Feb 11
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 42m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 52m
$259

Alaska Airlines

Pick Dates

Deal found 12/6

Feb 1 - Feb 5
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 42m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 48m
$278

Alaska Airlines

Pick Dates

Deal found 12/8

Feb 4 - Feb 9
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 42m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 48m
$284

Alaska Airlines

Pick Dates

Deal found 12/8

Last minute flights from St. Louis to Seattle

Late deals on return flights to Seattle from St. Louis, departing today and this week
Dec 13 - Jan 5
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

7h 46m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

23h 08m
$180

Spirit Airlines

Pick Dates

Deal found 12/6

Dec 13 - Jan 5
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

7h 46m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

2 stops

12h 12m
$227

Multiple Airlines

Pick Dates

Deal found 12/6

Dec 14 - Jan 6
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

24h 48m
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

14h 08m
$232

Frontier

Pick Dates

Deal found 12/8

One-way flights to Seattle from St. Louis

The cheapest one-way flights from St. Louis to Seattle
Dec 13
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

7h 46m
$80

Spirit Airlines

Pick Dates

Deal found 12/6

Jan 5
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

11h 47m
$81

Spirit Airlines

Pick Dates

Deal found 12/8

Jan 16
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

30h 14m
$88

Frontier

Pick Dates

Deal found 12/7

Related info for your journey

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

What airports do I use to fly from St. Louis to Seattle?

Booking a flight from Lambert-St Louis (STL) to Seattle/Tacoma Intl (SEA) is your only option if you wish to fly from St. Louis to Seattle. On a typical day, there is 1 flight from Lambert-St Louis to Seattle/Tacoma Intl, all of which are around 4h 26m for a nonstop flight. You can also purchase a plane ticket from 10 airlines when you book a flight from Lambert-St Louis to Seattle.

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, American 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 $200 on Cheapflights?

Yes, there are multiple flights from St. Louis to Seattle for under $200. The cheapest flight booked recently is on Multiple Airlines for just $167, but on average you can expect to pay $193.

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 $310.

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 can be found on the following days: Monday, Tuesday, Thursday, Friday.

How popular is this St. Louis to Seattle flight route?

Within the past month, 62 users have taken a look at flights from Lambert-St Louis to Seattle/Tacoma Intl.

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

Per day, 8 flights depart from St. Louis to Seattle on average.
Afternoon (Noon - 6pm) - 100% of flight departures

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

Airlines like Frontier and Spirit Airlines fly from St. Louis to Seattle in about 8h 48m. The time it takes to get you to your destination can typically vary by up to 2h 59m. There are 1714 mi between St. Louis and Seattle. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

What are the cheapest airlines flying from St. Louis to Seattle round-trip?

Currently priced at $176, Frontier will fly you from St. Louis to Seattle and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Spirit Airlines for as low as $186. You may be able to fly from St. Louis to Seattle for 56% less than the average price by searching for these airlines.

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 Spirit Airlines ($80), Frontier ($88), and United Airlines ($119).

What are the most popular airlines that fly from St. Louis to Seattle?

Consider American Airlines, Alaska Airlines or Delta when booking your flight. These represent the most popular airlines when flying from St. Louis to Seattle.

What are the most reliable airlines from St. Louis to Seattle?

The top 3 most reliable airlines when flying from St. Louis to Seattle are Qatar Airways (98%), Japan Airlines (89%) and Alaska Airlines (84%).

What are the cheapest flights from St. Louis to Seattle?

Looking for the cheapest flight from St. Louis to Seattle? While on average our users pay $895, our data indicates the cheapest price to be $169. The most popular route (Lambert-St Louis - Seattle/Tacoma Intl), is priced around $180.

Alternative routes for St. Louis to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying 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.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Juneyao AirlinesCheapest$14Average$22FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
FrontierCheapest$141Average$265FlexibilityNo cancel feeOn-time62%COVID-19 safety
Search Frontier flights
Spirit AirlinesCheapest$142Average$305FlexibilityNo cancel feeOn-time65%COVID-19 safety
Search Spirit Airlines flights
United AirlinesCheapest$174Average$499FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights
Alaska AirlinesCheapest$177Average$409FlexibilityNo cancel feeOn-time75%COVID-19 safety
Search Alaska Airlines flights
DeltaCheapest$199Average$403FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
American AirlinesCheapest$285Average$667FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights

Hourly flight availability from St. Louis to Seattle

See what time of day planes typically take off from St. Louis to Seattle
0%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
100%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to Seattle

See how many times per day planes take to the skies headed from St. Louis to Seattle
Sunday3daily flights
Monday3daily flights
Tuesday0daily flights
Wednesday3daily flights
Thursday3daily flights
Friday0daily flights
Saturday0daily flights