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Cheap flights from Seattle to St. Louis from $84

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 10/11. 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

United Airlines Logo
7:00 am - 3:44 pmSEA-STL
6h 44m1 stop
United Airlines Logo
5:49 pm - 10:59 pmSTL-SEA
7h 10m1 stop
$174United Airlines
Find Deal
Wed, Sep 3 - Fri, Sep 5
Delta Logo
11:55 pm - 10:37 amSEA-STL
8h 42m1 stop
Delta Logo
7:35 am - 2:43 pmSTL-SEA
9h 08m1 stop
$177Delta
Find Deal
Tue, Aug 26 - Tue, Sep 2
American Airlines Logo
3:00 pm - 11:48 pmSEA-STL
6h 48m1 stop
American Airlines Logo
10:10 am - 4:53 pmSTL-SEA
8h 43m1 stop
$189American Airlines
Find Deal
Thu, Sep 25 - Mon, Oct 6
American Airlines Logo
12:59 am - 10:37 amSEA-STL
7h 38m1 stop
American Airlines Logo
4:48 pm - 11:18 pmSTL-SEA
8h 30m1 stop
$213American Airlines
Find Deal
Wed, Nov 5 - Mon, Nov 10
Hawaiian Airlines Logo
8:36 am - 2:39 pmSEA-STL
4h 03mnonstop
Hawaiian Airlines Logo
3:35 pm - 5:54 pmSTL-SEA
4h 19mnonstop
$214Hawaiian Airlines
Find Deal
Sat, Sep 6 - Sat, Sep 13
Hawaiian Airlines Logo
11:34 am - 5:34 pmSEA-STL
4h 00mnonstop
Hawaiian Airlines Logo
6:00 am - 8:30 amSTL-SEA
4h 30mnonstop
$217Hawaiian Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
Southwest Logo
5:35 am - 2:25 pmSEA-STL
6h 50m1 stop
Southwest Logo
5:25 pm - 10:50 pmSTL-SEA
7h 25m1 stop
$236Southwest
Find Deal
Tue, Sep 30 - Tue, Sep 30
Alaska Airlines Logo
6:03 pm - 11:59 pmSEA-STL
3h 56mnonstop
Alaska Airlines Logo
6:00 am - 8:30 amSTL-SEA
4h 30mnonstop
$237Alaska Airlines
Find Deal
Thu, Aug 28 - Mon, Sep 1
Southwest Logo
6:45 am - 5:40 pmSEA-STL
8h 55m2 stops
Southwest Logo
4:35 pm - 11:35 pmSTL-SEA
9h 00m1 stop
$242Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Alaska Airlines Logo
8:38 am - 2:39 pmSEA-STL
4h 01mnonstop
Alaska Airlines Logo
6:00 am - 8:30 amSTL-SEA
4h 30mnonstop
$297Alaska Airlines
Find Deal
Sun, Aug 24 - Fri, Aug 29

Hawaiian Airlines flights from Seattle to St. Louis

Our best Hawaiian Airlines deals on Seattle to St. Louis flight tickets
Hawaiian Airlines
Sep 6
SEA8:36 amSeattle/Tacoma Intl
4h 03m
STL2:39 pmLambert-St Louis
Sep 13
STL3:35 pmLambert-St Louis
4h 19m
SEA5:54 pmSeattle/Tacoma Intl
$214
Find similar
Hawaiian Airlines
Aug 26
SEA11:34 amSeattle/Tacoma Intl
4h 00m
STL5:34 pmLambert-St Louis
Sep 2
STL6:00 amLambert-St Louis
4h 30m
SEA8:30 amSeattle/Tacoma Intl
$217
Find similar
Hawaiian Airlines
Aug 31
SEA6:03 pmSeattle/Tacoma Intl
3h 56m
STL11:59 pmLambert-St Louis
Sep 9
STL6:00 amLambert-St Louis
4h 30m
SEA8:30 amSeattle/Tacoma Intl
$227
Find similar

Delta flights from Seattle to St. Louis

Our best Delta deals on Seattle to St. Louis flight tickets
Delta
Aug 26
SEA11:55 pmSeattle/Tacoma Intl
8h 42m
1 stop
STL10:37 amLambert-St Louis
Sep 2
STL7:35 amLambert-St Louis
9h 08m
1 stop
SEA2:43 pmSeattle/Tacoma Intl
$177
Find similar
Delta
Sep 19
SEA11:40 pmSeattle/Tacoma Intl
6h 57m
1 stop
STL8:37 amLambert-St Louis
Sep 23
STL7:40 amLambert-St Louis
8h 59m
1 stop
SEA2:39 pmSeattle/Tacoma Intl
$183
Find similar
Delta
Sep 19
SEA11:40 pmSeattle/Tacoma Intl
6h 57m
1 stop
STL8:37 amLambert-St Louis
Sep 21
STL6:00 amLambert-St Louis
6h 45m
1 stop
SEA10:45 amSeattle/Tacoma Intl
$224
Find similar

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 July 31, 2025.
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

Wed 9/3

7:00 am-3:44 pm

1 stop6h 44m

Lambert-St Louis

Fri 9/5

5:49 pm-10:59 pm

1 stop7h 10m

$174

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 8/26

11:55 pm-10:37 am

1 stop8h 42m

Lambert-St Louis

Tue 9/2

7:35 am-2:43 pm

1 stop9h 08m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 9/25

3:00 pm-11:48 pm

1 stop6h 48m

Lambert-St Louis

Mon 10/6

10:10 am-4:53 pm

1 stop8h 43m

$189

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 11/5

12:59 am-10:37 am

1 stop7h 38m

Lambert-St Louis

Mon 11/10

4:48 pm-11:18 pm

1 stop8h 30m

$213

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 9/6

8:36 am-2:39 pm

Nonstop4h 03m

Lambert-St Louis

Sat 9/13

3:35 pm-5:54 pm

Nonstop4h 19m

$214

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 8/26

11:34 am-5:34 pm

Nonstop4h 00m

Lambert-St Louis

Tue 9/2

6:00 am-8:30 am

Nonstop4h 30m

$217

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 9/30

5:35 am-2:25 pm

1 stop6h 50m

Lambert-St Louis

Tue 9/30

5:25 pm-10:50 pm

1 stop7h 25m

$236

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 8/28

6:03 pm-11:59 pm

Nonstop3h 56m

Lambert-St Louis

Mon 9/1

6:00 am-8:30 am

Nonstop4h 30m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 8/27

6:45 am-5:40 pm

2 stops8h 55m

Lambert-St Louis

Wed 9/3

4:35 pm-11:35 pm

1 stop9h 00m

$242

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 8/24

8:38 am-2:39 pm

Nonstop4h 01m

Lambert-St Louis

Fri 8/29

6:00 am-8:30 am

Nonstop4h 30m

$297

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, September 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 $306. The month of October is another great option to travel to St. Louis, with average flight prices from Seattle averaging around $336.

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 $384. 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 $488. 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 in the evening is the least expensive time of day to depart. momondo users have found prices as low as $267 when looking at flights departing in the evening. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $439 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 $389 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 $297 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?

No. A direct flight is the cheapest option for a flight between Seattle to St. Louis.

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

As of July 2025, prices for Seattle to St. Louis flights are approximately 2% 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

$84

Fastest flight time

3h 52m

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 $84. The best round-trip flight deal from Seattle to St. Louis found on momondo in the last 72 hours is $174.
The fastest flight from Seattle to St. Louis takes 3h 52m
Direct flights go from Seattle to St. Louis every day.
There is 1 airport near St. Louis: 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 56m 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
FrontierPriceFrom $134Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
DeltaPriceFrom $182Free CancellationRating
8.0
7,981 reviews
Search Delta flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $188Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
United AirlinesPriceFrom $216Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $236Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
Hawaiian AirlinesPriceFrom $237Free CancellationRating
7.8
2,611 reviews
Search Hawaiian Airlines flights

  • Southwest Flights From Seattle to St. Louis

    Southwest is one of the most popular airlines flying from Seattle to St. Louis, operating 6 flights/week on average for this route. A good Southwest flight deal for Seattle to St. Louis starts from $188 round-trip, up to an average price of $423. Our users have rated Southwest at 8.0/10.

  • Alaska Airlines Flights From Seattle to St. Louis

    $236 is the best Alaska Airlines flight deal from Seattle to St. Louis found on momondo over the last 72 hours. The average Alaska Airlines ticket price found was closer to $417, however, with flight time and availability significantly affecting the price. Alaska Airlines (8.0/10 from 10,000 user reviews) flies into St. Louis from Seattle 8 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
Fenton
Collinsville
O'Fallon
Alton
St. Peters
Farmington
Wentzville
Festus
Glencoe
Eureka
Edwardsville
Clayton
Shrewsbury
Grafton

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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