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

SEA — STL
Sep 27 — Oct 41

The best prices from Seattle/Tacoma Intl to Lambert-St Louis are usually found in October or January, booked 44 days in advance, depart on a Saturday or Wednesday and return on a Tuesday

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

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

$237 - $593

STL

Temperature

32 - 80.6 °F

STL

Rainfall

2.2 - 4.7 inches

Popular inJuneHigh demand for flights, 35% potential price rise
Cheapest inOctoberBest time to find cheap flights, 38% potential price drop
Round-trip from$237From Seattle/Tacoma Intl to Lambert-St Louis
One-way from$119One-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 Thursday 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 44 days before your planned departure. Booking around this time can save you about 41% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $442 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $530.

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

October can be a great time to fly to St. Louis from Seattle with a flight ticket averaging about $384. Cheapflights users have found deals in the month of October for as cheap as $197. The most expensive prices can be found in the month of June.

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 in the morning, which can drop the price by up to 16% versus a flight in the afternoon.

Cheap flights from Seattle to St. Louis in September, October 2022

The best prices found for SEA to STL flights for September, October
Oct 19 - Oct 25
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 19m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$128

Spirit Airlines

Pick Dates

Deal found 20/9/22

Oct 12 - Oct 18
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

26h 59m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$133

Spirit Airlines

Pick Dates

Deal found 19/9/22

Oct 19 - Oct 25
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 19m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$135

Spirit Airlines

Pick Dates

Deal found 20/9/22

Seattle to St. Louis 2022 flight deals

Cheap flights to St. Louis from Seattle found for this year
Oct 19 - Oct 25
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 19m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$128

Spirit Airlines

Pick Dates

Deal found 20/9/22

Oct 12 - Oct 18
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

26h 59m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$133

Spirit Airlines

Pick Dates

Deal found 19/9/22

Oct 19 - Oct 25
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 19m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$135

Spirit Airlines

Pick Dates

Deal found 20/9/22

Cheap Frontier flights from Seattle to St. Louis

Oct 21 - Oct 28
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

11h 42m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

11h 48m
$164

Frontier

Pick Dates

Deal found 21/9/22

Oct 4 - Oct 10
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

7h 16m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

13h 16m
$168

Frontier

Pick Dates

Deal found 21/9/22

Nov 9 - Dec 5
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

20h 37m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

21h 46m
$172

Frontier

Pick Dates

Deal found 22/9/22

  • One of the most popular airlines traveling from Seattle to St. Louis is Frontier. Flights from Frontier traveling this route typically cost $377.20 RT. This price is typically 44% cheaper than other airlines that offer Seattle to St. Louis flights. When booking this route, the cheapest RT price found was $157. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to St. Louis. Lambert-St Louis Airport is the most popular arrival airport in St. Louis. When flying from Seattle to St. Louis, Frontier flights are 27% more popular than any other airline flying that same route.

Cheap Spirit Airlines flights from Seattle to St. Louis

Oct 19 - Oct 25
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 19m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$128

Spirit Airlines

Pick Dates

Deal found 20/9/22

Oct 12 - Oct 18
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

26h 59m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$133

Spirit Airlines

Pick Dates

Deal found 19/9/22

Oct 18 - Oct 25
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

11h 42m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$135

Spirit Airlines

Pick Dates

Deal found 19/9/22

  • If you’re traveling from Seattle to St. Louis, one of the more common airlines traveling that route is Spirit Airlines. Seattle to St. Louis flights are typically 21% cheaper than other airlines traveling the same route. Flights from Spirit Airlines typically cost $615.20 RT. The cheapest Spirit Airlines flight found for this route was $209. When traveling from Seattle to St. Louis on Spirit Airlines, the most popular airport to depart from is Seattle/Tacoma Intl Airport and the most popular airport to arrive at is Lambert-St Louis Airport. When flying from Seattle to St. Louis, Spirit Airlines flights are 19% more popular than any other airline flying that same route.

Non-stop flights to St. Louis from Seattle

Save time with Seattle to St. Louis direct flight deals
Jan 10 - Jan 31
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 52m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 44m
$298

Alaska Airlines

Pick Dates

Deal found 19/9/22

Jan 7 - Jan 25
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 54m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 44m
$328

Alaska Airlines

Pick Dates

Deal found 19/9/22

Jan 10 - Jan 29
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

Nonstop

3h 52m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

Nonstop

4h 44m
$337

Alaska Airlines

Pick Dates

Deal found 19/9/22

Last minute flights from Seattle to St. Louis

Late deals on return flights to St. Louis from Seattle, departing today and this week
Sep 30 - Oct 11
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

11h 49m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

15h 47m
$150

Multiple Airlines

Pick Dates

Deal found 21/9/22

Sep 30 - Oct 4
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

11h 49m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

14h 56m
$164

Frontier

Pick Dates

Deal found 21/9/22

Sep 30 - Oct 4
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

11h 06m
STL

Lambert-St Louis

SEA

Seattle/Tacoma Intl

1 stop

14h 56m
$168

Frontier

Pick Dates

Deal found 20/9/22

One-way flights to St. Louis from Seattle

The cheapest one-way flights from Seattle to St. Louis
Oct 19
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

11h 42m
$60

Spirit Airlines

Pick Dates

Deal found 20/9/22

Oct 19
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

6h 19m
$62

Spirit Airlines

Pick Dates

Deal found 20/9/22

Oct 17
SEA

Seattle/Tacoma Intl

STL

Lambert-St Louis

1 stop

26h 59m
$68

Spirit Airlines

Pick Dates

Deal found 19/9/22

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 48m for a nonstop flight. There are 4 flights 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, American Airlines, and Delta 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 Spirit Airlines for just $128, but on average you can expect to pay $149.

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

Cheapflights has at least 20 direct flights from Seattle to St. Louis under $300. A good price for a nonstop flight from Seattle to St. Louis is less than $397.

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.

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

You can find nonstop flights on the following days: Friday.

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

The Seattle/Tacoma Intl to Lambert-St Louis flight path was viewed by 37 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

On average 7 flights depart from Seattle to St. Louis per day.
Morning (6am - Noon) - 43% of flight departures
Evening (6pm - Midnight) - 57% of flight departures

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

Spirit Airlines and Frontier can get you from Seattle to St. Louis in just under 6h 19m. Your travel time can differ by up to 5h 23m. Airlines will cover a distance of 1714 mi. This flight may include one or multiple stops.

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 $128. Another airline that can offer you cheap pricing is Frontier. These flights start at 66% lower than the current average price 3 months from now.

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

$60 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on Frontier and Delta, with prices starting from $86 and $119, respectively.

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

American Airlines, Alaska Airlines and Delta 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 (94%), Singapore Airlines (89%), Alaska Airlines (86%).

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

The cheapest flight price from Seattle to St. Louis is $148. On average you can expect to pay $732. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $152.

Alternative routes for Seattle to St. Louis

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

Top 7 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
Juneyao AirlinesCheapest$14Average$23FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
FrontierCheapest$108Average$325FlexibilityNo cancel feeOn-time62%COVID-19 safety
Search Frontier flights
Spirit AirlinesCheapest$126Average$246FlexibilityNo cancel feeOn-time65%COVID-19 safety
Search Spirit Airlines flights
Alaska AirlinesCheapest$157Average$377FlexibilityNo cancel feeOn-time75%COVID-19 safety
Search Alaska Airlines flights
DeltaCheapest$195Average$473FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
United AirlinesCheapest$202Average$447FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights
American AirlinesCheapest$209Average$615FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights

Hourly flight availability from Seattle to St. Louis

See what time of day planes typically take off from Seattle to St. Louis
1%of flight departuresEarly morningMidnight to 6 am
17%of flight departuresMorning6 am to noon
82%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
Monday6daily flights
Tuesday7daily flights
Wednesday6daily flights
Thursday3daily flights
Friday5daily flights
Saturday1daily flight