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Cheap flights from Seattle to St. Louis from $62

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 10/15. 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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Find the cheapest flights from Seattle to St. Louis

Cheap round-trip flights

Delta Logo
11:15 am - 7:06 pmSEA-STL
5h 51m1 stop
Delta Logo
2:36 pm - 10:15 pmSTL-SEA
9h 39m1 stop
$177Delta
Find Deal
Wed, Dec 3 - Tue, Dec 9
Southwest Logo
10:45 pm - 7:35 amSEA-STL
6h 50m1 stop
Southwest Logo
3:00 pm - 10:00 pmSTL-SEA
9h 00m2 stops
$183Southwest
Find Deal
Tue, Sep 30 - Tue, Oct 7
Frontier Logo
4:36 pm - 9:06 amSEA-STL
14h 30m2 stops
Frontier Logo
7:55 pm - 12:30 amSTL-SEA
6h 35m1 stop
$188Frontier
Find Deal
Mon, Sep 29 - Fri, Oct 3
American Airlines Logo
12:31 am - 8:50 amSEA-STL
6h 19m1 stop
American Airlines Logo
2:09 pm - 8:56 pmSTL-SEA
8h 47m1 stop
$189American Airlines
Find Deal
Wed, Dec 3 - Thu, Dec 11
Frontier Logo
6:12 am - 9:06 amSEA-STL
24h 54m1 stop
Frontier Logo
7:55 pm - 12:30 amSTL-SEA
6h 35m1 stop
$195Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Hawaiian Airlines Logo
6:02 pm - 12:03 amSEA-STL
4h 01mnonstop
Hawaiian Airlines Logo
6:33 am - 9:05 amSTL-SEA
4h 32mnonstop
$233Hawaiian Airlines
Find Deal
Sat, Oct 11 - Sat, Oct 18
Alaska Airlines Logo
8:34 am - 2:27 pmSEA-STL
3h 53mnonstop
Alaska Airlines Logo
7:00 am - 9:40 amSTL-SEA
4h 40mnonstop
$237Alaska Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 13
Hawaiian Airlines Logo
9:15 am - 3:18 pmSEA-STL
4h 03mnonstop
Hawaiian Airlines Logo
7:00 am - 9:41 amSTL-SEA
4h 41mnonstop
$247Hawaiian Airlines
Find Deal
Sat, Nov 15 - Sun, Nov 23
Alaska Airlines Logo
6:02 pm - 12:03 amSEA-STL
4h 01mnonstop
Alaska Airlines Logo
7:00 am - 9:33 amSTL-SEA
4h 33mnonstop
$257Alaska Airlines
Find Deal
Fri, Oct 24 - Sun, Oct 26
American Airlines Logo
11:56 pm - 9:37 amSEA-STL
7h 41m1 stop
American Airlines Logo
5:20 am - 10:54 amSTL-SEA
7h 34m1 stop
$263American Airlines
Find Deal
Mon, Oct 20 - Wed, Oct 22

Delta flights from Seattle to St. Louis

Our best Delta deals on Seattle to St. Louis flight tickets
Delta
Dec 3
SEA11:15 amSeattle/Tacoma Intl
5h 51m
1 stop
STL7:06 pmLambert-St Louis
Dec 9
STL2:36 pmLambert-St Louis
9h 39m
1 stop
SEA10:15 pmSeattle/Tacoma Intl
$177
Find similar
Delta
Dec 3
SEA1:39 pmSeattle/Tacoma Intl
7h 49m
1 stop
STL11:28 pmLambert-St Louis
Dec 14
STL6:00 amLambert-St Louis
6h 54m
1 stop
SEA10:54 amSeattle/Tacoma Intl
$185
Find similar
Delta
Feb 18
SEA11:05 pmSeattle/Tacoma Intl
8h 39m
1 stop
STL9:44 amLambert-St Louis
Feb 24
STL7:30 amLambert-St Louis
9h 38m
1 stop
SEA3:08 pmSeattle/Tacoma Intl
$197
Find similar

Hawaiian Airlines flights from Seattle to St. Louis

Our best Hawaiian Airlines deals on Seattle to St. Louis flight tickets
Hawaiian Airlines
Oct 11
SEA6:02 pmSeattle/Tacoma Intl
4h 01m
STL12:03 amLambert-St Louis
Oct 18
STL6:33 amLambert-St Louis
4h 32m
SEA9:05 amSeattle/Tacoma Intl
$233
Find similar
Hawaiian Airlines
Nov 15
SEA9:15 amSeattle/Tacoma Intl
4h 03m
STL3:18 pmLambert-St Louis
Nov 23
STL7:00 amLambert-St Louis
4h 41m
SEA9:41 amSeattle/Tacoma Intl
$247
Find similar
Hawaiian Airlines
Sep 29
SEA6:03 pmSeattle/Tacoma Intl
3h 56m
STL11:59 pmLambert-St Louis
Oct 2
STL6:30 pmLambert-St Louis
4h 29m
SEA8:59 pmSeattle/Tacoma Intl
$409
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 September 15, 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 12/3

11:15 am-7:06 pm

1 stop5h 51m

Lambert-St Louis

Tue 12/9

2:36 pm-10:15 pm

1 stop9h 39m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 9/30

10:45 pm-7:35 am

1 stop6h 50m

Lambert-St Louis

Tue 10/7

3:00 pm-10:00 pm

2 stops9h 00m

$183

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 9/29

4:36 pm-9:06 am

2 stops14h 30m

Lambert-St Louis

Fri 10/3

7:55 pm-12:30 am

1 stop6h 35m

$188

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/3

12:31 am-8:50 am

1 stop6h 19m

Lambert-St Louis

Thu 12/11

2:09 pm-8:56 pm

1 stop8h 47m

$189

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 10/3

6:12 am-9:06 am

1 stop24h 54m

Lambert-St Louis

Sun 10/5

7:55 pm-12:30 am

1 stop6h 35m

$195

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 10/11

6:02 pm-12:03 am

Nonstop4h 01m

Lambert-St Louis

Sat 10/18

6:33 am-9:05 am

Nonstop4h 32m

$233

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 12/6

8:34 am-2:27 pm

Nonstop3h 53m

Lambert-St Louis

Sat 12/13

7:00 am-9:40 am

Nonstop4h 40m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 11/15

9:15 am-3:18 pm

Nonstop4h 03m

Lambert-St Louis

Sun 11/23

7:00 am-9:41 am

Nonstop4h 41m

$247

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 10/24

6:02 pm-12:03 am

Nonstop4h 01m

Lambert-St Louis

Sun 10/26

7:00 am-9:33 am

Nonstop4h 33m

$257

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 10/20

11:56 pm-9:37 am

1 stop7h 41m

Lambert-St Louis

Wed 10/22

5:20 am-10:54 am

1 stop7h 34m

$263

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, October 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 $336. The month of June is another great option to travel to St. Louis, with average flight prices from Seattle averaging around $360.

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 $394. 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 $487. 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 $440 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 $395 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 6% 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 September 2025, prices for Seattle to St. Louis flights are approximately 19% 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

$169

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 $169. The best round-trip flight deal from Seattle to St. Louis found on momondo in the last 72 hours is $289.
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 53m 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 $137Free CancellationRating
5.8
3,172 reviews
Search Frontier flights
DeltaPriceFrom $176Free CancellationRating
7.9
7,954 reviews
Search Delta flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $188Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $216Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
Hawaiian AirlinesPriceFrom $219Free CancellationRating
7.8
2,723 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $246Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights

  • Southwest Flights From Seattle to St. Louis

    Southwest is one of the most popular airlines flying from Seattle to St. Louis, operating 5 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 $388. Our users have rated Southwest at 8.0/10.

  • Alaska Airlines Flights From Seattle to St. Louis

    $246 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 $423, 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 12 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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
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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