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Cheap flights from Seattle to St. Louis from $80

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to St. Louis departing on 2/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Seattle to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
12:59 am - 11:01 am
SEA
-
STL
8h 02m
1 stop
American Airlines Logo
6:37 pm - 12:24 am
STL
-
SEA
7h 47m
1 stop
$159American Airlines
Mon, Mar 2 - Tue, Mar 10
American Airlines Logo
11:55 pm - 8:54 am
SEA
-
STL
6h 59m
1 stop
American Airlines Logo
5:21 pm - 10:38 pm
STL
-
SEA
7h 17m
1 stop
$167American Airlines
Mon, Apr 20 - Sat, Apr 25
American Airlines Logo
12:07 am - 8:41 am
SEA
-
STL
6h 34m
1 stop
American Airlines Logo
6:36 pm - 12:24 am
STL
-
SEA
7h 48m
1 stop
$168American Airlines
Thu, Feb 26 - Sat, Feb 28
Delta Logo
3:30 pm - 11:25 pm
SEA
-
STL
5h 55m
1 stop
Delta Logo
6:12 pm - 12:03 am
STL
-
SEA
7h 51m
1 stop
$177Delta
Thu, Mar 26 - Thu, Apr 9
American Airlines Logo
3:00 pm - 11:59 pm
SEA
-
STL
6h 59m
1 stop
American Airlines Logo
6:36 pm - 12:24 am
STL
-
SEA
7h 48m
1 stop
$184American Airlines
Sat, Feb 28 - Sat, Mar 7
American Airlines Logo
12:07 am - 8:41 am
SEA
-
STL
6h 34m
1 stop
American Airlines Logo
6:36 pm - 12:24 am
STL
-
SEA
7h 48m
1 stop
$193American Airlines
Sun, Mar 1 - Sat, Mar 7
Alaska Airlines Logo
7:55 am - 1:51 pm
SEA
-
STL
3h 56mnonstop
Alaska Airlines Logo
7:00 am - 9:42 am
STL
-
SEA
4h 42mnonstop
$197Alaska Airlines
Tue, Mar 3 - Wed, Mar 4
American Airlines Logo
11:57 pm - 8:55 am
SEA
-
STL
6h 58m
1 stop
American Airlines Logo
6:36 pm - 12:24 am
STL
-
SEA
7h 48m
1 stop
$198American Airlines
Fri, Feb 20 - Sat, Feb 28
Frontier Logo
12:00 pm - 1:56 pm
SEA
-
STL
23h 56m
1 stop
Frontier Logo
10:11 pm - 10:54 am
STL
-
SEA
14h 43m
1 stop
$205Frontier
Fri, Feb 20 - Mon, Feb 23
Alaska Airlines Logo
6:07 pm - 11:59 pm
SEA
-
STL
3h 52mnonstop
Alaska Airlines Logo
2:47 pm - 5:26 pm
STL
-
SEA
4h 39mnonstop
$207Alaska Airlines
Thu, Feb 26 - Sat, Feb 28

Alaska Airlines flights from Seattle to St. Louis

Our best Alaska Airlines deals on Seattle to St. Louis flight tickets
Alaska Airlines
Mar 3
SEA7:55 amSeattle/Tacoma Intl
3h 56m
STL1:51 pmLambert-St Louis
Mar 4
STL7:00 amLambert-St Louis
4h 42m
SEA9:42 amSeattle/Tacoma Intl
$197
Alaska Airlines
Feb 26
SEA6:07 pmSeattle/Tacoma Intl
3h 52m
STL11:59 pmLambert-St Louis
Feb 28
STL2:47 pmLambert-St Louis
4h 39m
SEA5:26 pmSeattle/Tacoma Intl
$207
Alaska Airlines
Feb 23
SEA6:07 pmSeattle/Tacoma Intl
3h 52m
STL11:59 pmLambert-St Louis
Feb 27
STL2:47 pmLambert-St Louis
4h 39m
SEA5:26 pmSeattle/Tacoma Intl
$217

Frontier flights from Seattle to St. Louis

Our best Frontier deals on Seattle to St. Louis flight tickets
Frontier
Feb 20
SEA12:00 pmSeattle/Tacoma Intl
23h 56m
1 stop
STL1:56 pmLambert-St Louis
Feb 23
STL10:11 pmLambert-St Louis
14h 43m
1 stop
SEA10:54 amSeattle/Tacoma Intl
$205
Frontier
Feb 27
SEA12:00 pmSeattle/Tacoma Intl
23h 56m
1 stop
STL1:56 pmLambert-St Louis
Mar 3
STL3:49 pmLambert-St Louis
42h 24m
2 stops
SEA8:13 amSeattle/Tacoma Intl
$214
Frontier
Mar 9
SEA9:36 pmSeattle/Tacoma Intl
19h 35m
1 stop
STL7:11 pmLambert-St Louis
Mar 16
STL8:12 pmLambert-St Louis
46h 57m
2 stops
SEA5:09 pmSeattle/Tacoma Intl
$223

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Seattle to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 3/2

12:59 am-11:01 am

1 stop8h 02m

Lambert-St Louis

Tue 3/10

6:37 pm-12:24 am

1 stop7h 47m

$159

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 4/20

11:55 pm-8:54 am

1 stop6h 59m

Lambert-St Louis

Sat 4/25

5:21 pm-10:38 pm

1 stop7h 17m

$167

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 2/26

12:07 am-8:41 am

1 stop6h 34m

Lambert-St Louis

Sat 2/28

6:36 pm-12:24 am

1 stop7h 48m

$168

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 3/26

3:30 pm-11:25 pm

1 stop5h 55m

Lambert-St Louis

Thu 4/9

6:12 pm-12:03 am

1 stop7h 51m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 2/28

3:00 pm-11:59 pm

1 stop6h 59m

Lambert-St Louis

Sat 3/7

6:36 pm-12:24 am

1 stop7h 48m

$184

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 3/1

12:07 am-8:41 am

1 stop6h 34m

Lambert-St Louis

Sat 3/7

6:36 pm-12:24 am

1 stop7h 48m

$193

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 3/3

7:55 am-1:51 pm

Nonstop3h 56m

Lambert-St Louis

Wed 3/4

7:00 am-9:42 am

Nonstop4h 42m

$197

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 2/20

11:57 pm-8:55 am

1 stop6h 58m

Lambert-St Louis

Sat 2/28

6:36 pm-12:24 am

1 stop7h 48m

$198

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 2/20

12:00 pm-1:56 pm

1 stop23h 56m

Lambert-St Louis

Mon 2/23

10:11 pm-10:54 am

1 stop14h 43m

$205

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 2/26

6:07 pm-11:59 pm

Nonstop3h 52m

Lambert-St Louis

Sat 2/28

2:47 pm-5:26 pm

Nonstop4h 39m

$207

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Seattle to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

In general, January is the cheapest month to fly from Seattle to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $268. The month of October is another great option to travel to St. Louis, with average flight prices from Seattle averaging around $327.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $379. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $485. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Seattle at noon is the least expensive time of day to depart. momondo users have found prices as low as $269 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $417 per ticket.

What is the cheapest Seattle/Tacoma Intl to Lambert-St Louis flight route?

Fly from Seattle/Tacoma Intl to Lambert-St Louis for the best Seattle/Tacoma Intl - Lambert-St Louis flight prices

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

You are more likely to see cheaper flights to St. Louis from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $375 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Seattle for as low as $262 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to St. Louis flights?

You could potentially save up to 38% on your flight if you consider stops on a Seattle to St. Louis flight.

How have Seattle to St. Louis flight prices changed over time?

As of February 2026, prices for Seattle to St. Louis flights are approximately 3% more expensive when compared to flights at the same time last year.

When to book flights from Seattle to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to St. Louis (SEA to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to St. Louis

Best Price Found

$174

Fastest flight time

3h 50m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Seattle in the past 72 hours is $174. The best round-trip flight deal from Seattle to St. Louis found on momondo in the last 72 hours is $217.
The fastest flight from Seattle to St. Louis takes 3h 50m
Direct flights go from Seattle to St. Louis every day.
There is 1 airport in St. Louis. From Seattle there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Seattle/Tacoma Intl to Lambert-St Louis by plane?

    The distance between Seattle/Tacoma Intl and Lambert-St Louis is about 1719.6 mi. Typically, this will take 3h 50m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Seattle to St. Louis?

  • What is the most popular airline from Seattle to St. Louis?

Best airlines flying from Seattle to St. Louis

Compare and see reviews for airlines that fly from Seattle to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $94Free CancellationRating
7.9
8,138 reviews
Search Delta flights
FrontierPriceFrom $121Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
United AirlinesPriceFrom $157Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
Hawaiian AirlinesPriceFrom $181Free CancellationRating
7.8
2,831 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $182Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
American AirlinesPriceFrom $188Free CancellationRating
7.2
11,218 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $228Free CancellationRating
8.0
11,834 reviews
Search Alaska Airlines flights

  • Alaska Airlines Flights From Seattle to St. Louis

    Alaska Airlines is one of the most popular airlines flying from Seattle to St. Louis, operating 2 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to St. Louis starts from $228 round-trip, up to an average price of $403. Our users have rated Alaska Airlines at 8.0/10.

  • Hawaiian Airlines Flights From Seattle to St. Louis

    $181 is the best Hawaiian Airlines flight deal from Seattle to St. Louis found on momondo over the last 72 hours. The average Hawaiian Airlines ticket price found was closer to $386, however, with flight time and availability significantly affecting the price. Hawaiian Airlines (7.8/10 from 2,830 user reviews) flies into St. Louis from Seattle 4 times in an average week so prices can vary.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to St. Louis?

Finding the right flight to St. Louis from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

Can I find flights from Seattle to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to St. Louis?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to St. Louis.

I’m not ready to book a flight from Seattle to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Seattle and alert you when they change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
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