St. Louis

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

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

How to find the cheapest flight from Seattle to St. Louis

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

SEA - STL

Price

$246 - $402

STL

Temperature

32 - 80.6 °F

STL

Precipitation

2.2 - 4.7 inches

Popular in

December

High demand for flights, 27% potential price rise

Cheapest in

August

Best time to find cheap flights, 16% potential price drop

Round-trip from

$246

From Seattle/Tacoma Intl to Lambert-St Louis

One-way from

$99

One-way flight from Seattle/Tacoma Intl to Lambert-St Louis

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

Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to St. Louis. Check prices with Cheapflights to find a great deal for your trip.

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

To save on the cost of your flight from Seattle to St. Louis, book at least 28 days before your planned departure. Booking around this time can save you about 69% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $316 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $464.

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

August can be a great time to fly to St. Louis from Seattle with a flight ticket averaging about $293. Cheapflights users have found deals in the month of August for as cheap as $177. The most expensive prices can be found in the month of December.

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

When flying from Seattle to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 20% versus a flight in the morning.

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

The best prices found for SEA to STL flights for January, February
Feb 10 - Feb 14
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 10m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$151

Multiple Airlines

View Deal

Deal found 25/1/22

Feb 10 - Feb 14
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 10m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$152

Multiple Airlines

View Deal

Deal found 26/1/22

Feb 9 - Feb 10
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

20h 47m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

25h 10m
$154

Spirit Airlines

View Deal

Deal found 24/1/22

Seattle to St. Louis 2022 flight deals

Cheap flights to St. Louis from Seattle found for this year
May 2 - May 4
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 41m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

7h 36m
$139

Frontier

View Deal

Deal found 26/1/22

Feb 10 - Feb 14
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 10m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$151

Multiple Airlines

View Deal

Deal found 25/1/22

Feb 10 - Feb 14
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 10m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$152

Multiple Airlines

View Deal

Deal found 26/1/22

Non-stop flights to St. Louis from Seattle

Save time with Seattle to St. Louis direct flight deals
Feb 10 - Feb 12
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 50m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$178

Alaska Airlines

View Deal

Deal found 25/1/22

Feb 10 - Feb 14
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 50m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$179

Alaska Airlines

View Deal

Deal found 26/1/22

Feb 11 - Feb 12
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 50m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$188

Alaska Airlines

View Deal

Deal found 25/1/22

Last minute flights from Seattle to St. Louis

Late deals on return flights to St. Louis from Seattle, departing today and this week
Feb 3 - Feb 10
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

16h 29m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 40m
$175

Multiple Airlines

View Deal

Deal found 25/1/22

Feb 3 - Feb 7
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

20h 47m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

25h 10m
$183

Spirit Airlines

View Deal

Deal found 25/1/22

Feb 2 - Feb 7
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

20h 47m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

25h 10m
$192

Spirit Airlines

View Deal

Deal found 26/1/22

One-way flights to Lambert-St Louis from Seattle

The cheapest one-way flights from Seattle to St. Louis
Feb 24
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 10m
$61

Frontier

View Deal

Deal found 24/1/22

Feb 10
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 10m
$62

Frontier

View Deal

Deal found 24/1/22

Feb 23
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

24h 22m
$75

Spirit Airlines

View Deal

Deal found 24/1/22

Related info for your journey

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

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

If you book a flight from Seattle to St. Louis, you will be flying from Seattle/Tacoma Intl to Lambert-St Louis. Flights to Lambert-St Louis (STL) from Seattle/Tacoma Intl (SEA) take 3h 50m for a nonstop flight. There is 1 flight from Seattle/Tacoma Intl to St. Louis per day from 8 airlines.

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

Alaska Airlines, Delta, and Frontier are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from Seattle to St. Louis for under $200 on Cheapflights?

Yes, there are multiple flights from Seattle to St. Louis for under $200. The cheapest flight booked recently is on Frontier for just $139, but on average you can expect to pay $165.

Are there nonstop flights from Seattle to St. Louis for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to St. Louis under $200. A good price for a nonstop flight from Seattle to St. Louis is less than $248.

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

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

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

The Seattle/Tacoma Intl to Lambert-St Louis flight path was viewed by 47 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

Cheapflights users have booked flights from Seattle to St. Louis round-trip from $139. Other airlines that can offer you cheap pricing are Spirit Airlines, from $154, and Alaska Airlines, from $178. These flights start at 52% lower than the current average price 3 months from now.

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

$61 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Spirit Airlines and Alaska Airlines, with prices starting from $75 and $89, respectively.

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

Major Airline, American Airlines and Alaska Airlines are the most popular airlines when flying from Seattle to St. Louis.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to St. Louis on time: Southwest (100%), Alaska Airlines (72%), Singapore Airlines (36%).

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

The cheapest flight price from Seattle to St. Louis is $98. On average you can expect to pay $470. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $153.

Can I fly to Lambert-St Louis from Seattle/Tacoma Intl right now?

Information is based on travel restrictions for travel to Lambert-St Louis within the United States

Most visitors from Seattle/Tacoma Intl need to provide a negative COVID-19 test result and/or quarantine to enter Lambert-St Louis.

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Lambert-St Louis.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Lambert-St Louis.

Can I fly back to Seattle/Tacoma Intl from Lambert-St Louis?

Returning to Seattle/Tacoma Intl from Lambert-St Louis

COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Seattle/Tacoma Intl.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Seattle/Tacoma Intl.

Alternative routes for Seattle to St. Louis

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

Top 6 airlines flying from Seattle to St. Louis

The chart below displays the airlines Cheapflights users traveling from Seattle to St. Louis choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Frontier
Cheapest$115
Average$263
FlexibilityNo cancel fee
On-time62%
COVID-19 safety
Delta
Cheapest$117
Average$336
FlexibilityNo cancel fee
On-timeN/A
COVID-19 safety
American Airlines
Cheapest$137
Average$346
FlexibilityNo cancel fee
On-time71%
COVID-19 safety
United Airlines
Cheapest$140
Average$348
FlexibilityNo cancel fee
On-time69%
COVID-19 safety
Sun Country Air
Cheapest$146
Average$269
FlexibilityNo cancel fee
On-time83%
COVID-19 safety
Alaska Airlines
Cheapest$148
Average$352
FlexibilityNo cancel fee
On-time75%
COVID-19 safety

Hourly flight availability from Seattle to St. Louis

See what time of day planes typically take off from Seattle to St. Louis
30%of flight departuresEarly morningMidnight to 6 am
70%of flight departuresMorning6 am to noon
0%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to St. Louis

See how many times per day planes take to the skies headed from Seattle to St. Louis
Sunday2daily flights
Monday2daily flights
Tuesday1daily flight
Wednesday1daily flight
Thursday2daily flights
Friday2daily flights
Saturday1daily flight