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Cheap flights from St. Louis to Seattle 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 St. Louis to Seattle departing on 2/9. 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 St. Louis to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:46 pm - 11:19 am
STL
-
SEA
21h 33m1 stop
Frontier Logo
9:25 pm - 8:48 pm
SEA
-
STL
21h 23m1 stop
$181Frontier
Wed, Jan 21 - Thu, Jan 22
Frontier Logo
8:12 pm - 5:09 pm
STL
-
SEA
22h 57m2 stops
Frontier Logo
9:36 pm - 12:15 pm
SEA
-
STL
12h 39m1 stop
$183Frontier
Wed, Mar 11 - Mon, Mar 16
Frontier Logo
8:12 pm - 5:09 pm
STL
-
SEA
22h 57m2 stops
Frontier Logo
12:24 pm - 9:49 am
SEA
-
STL
19h 25m1 stop
$185Frontier
Wed, Mar 11 - Sun, Mar 15
Multiple Airlines Logo
7:00 am - 9:42 am
STL
-
SEA
4h 42mnonstop
Multiple Airlines Logo
9:23 pm - 11:19 am
SEA
-
STL
11h 56m1 stop
$186Multiple Airlines
Wed, Mar 4 - Thu, Mar 5
Frontier Logo
5:18 pm - 11:01 am
STL
-
SEA
19h 43m2 stops
Frontier Logo
9:23 pm - 11:19 am
SEA
-
STL
11h 56m1 stop
$188Frontier
Wed, Mar 4 - Thu, Mar 5
Alaska Airlines Logo
7:00 am - 9:42 am
STL
-
SEA
4h 42mnonstop
Alaska Airlines Logo
6:07 pm - 11:59 pm
SEA
-
STL
3h 52mnonstop
$189Alaska Airlines
Fri, Feb 13 - Mon, Feb 16
Southwest Logo
6:05 am - 1:15 pm
STL
-
SEA
9h 10m1 stop
Southwest Logo
9:55 am - 8:35 pm
SEA
-
STL
8h 40m2 stops
$191Southwest
Wed, Feb 4 - Wed, Feb 11
Alaska Airlines Logo
7:00 am - 9:42 am
STL
-
SEA
4h 42mnonstop
Alaska Airlines Logo
6:07 pm - 11:59 pm
SEA
-
STL
3h 52mnonstop
$192Alaska Airlines
Wed, Mar 11 - Sun, Mar 15
Delta Logo
6:59 pm - 12:01 am
STL
-
SEA
7h 02m1 stop
Delta Logo
6:05 am - 4:45 pm
SEA
-
STL
8h 40m1 stop
$193Delta
Fri, May 15 - Sun, May 24
Multiple Airlines Logo
7:00 am - 9:42 am
STL
-
SEA
4h 42mnonstop
Multiple Airlines Logo
1:16 pm - 9:49 am
SEA
-
STL
18h 33m1 stop
$196Multiple Airlines
Sun, Mar 1 - Thu, Mar 5

Southwest flights from St. Louis to Seattle

Our best Southwest deals on St. Louis to Seattle flight tickets
Southwest
Feb 4
STL6:05 amLambert-St Louis
9h 10m
1 stop
SEA1:15 pmSeattle/Tacoma Intl
Feb 11
SEA9:55 amSeattle/Tacoma Intl
8h 40m
2 stops
STL8:35 pmLambert-St Louis
$191
Find similar
Southwest
Feb 18
STL12:25 pmLambert-St Louis
12h 05m
1 stop
SEA10:30 pmSeattle/Tacoma Intl
Feb 25
SEA11:20 amSeattle/Tacoma Intl
9h 00m
2 stops
STL10:20 pmLambert-St Louis
$197
Find similar
Southwest
Jan 31
STL3:55 pmLambert-St Louis
7h 10m
1 stop
SEA9:05 pmSeattle/Tacoma Intl
Feb 3
SEA5:15 amSeattle/Tacoma Intl
9h 55m
2 stops
STL5:10 pmLambert-St Louis
$204
Find similar

American Airlines flights from St. Louis to Seattle

Our best American Airlines deals on St. Louis to Seattle flight tickets
American Airlines
Mar 1
STL4:13 pmLambert-St Louis
8h 54m
1 stop
SEA11:07 pmSeattle/Tacoma Intl
Mar 5
SEA5:37 amSeattle/Tacoma Intl
9h 36m
1 stop
STL5:13 pmLambert-St Louis
$208
Find similar
American Airlines
Jan 26
STL7:15 amLambert-St Louis
10h 19m
1 stop
SEA3:34 pmSeattle/Tacoma Intl
Jan 26
SEA9:45 pmSeattle/Tacoma Intl
9h 55m
1 stop
STL9:40 amLambert-St Louis
$217
Find similar
American Airlines
Jan 26
STL7:15 amLambert-St Louis
10h 19m
1 stop
SEA3:34 pmSeattle/Tacoma Intl
Jan 28
SEA8:35 amSeattle/Tacoma Intl
8h 54m
1 stop
STL7:29 pmLambert-St Louis
$221
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Seattle 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 January 7, 2026.
Use the filters below to find and compare flights from St. Louis to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 1/21

3:46 pm-11:19 am

1 stop21h 33m

Seattle/Tacoma Intl

Thu 1/22

9:25 pm-8:48 pm

1 stop21h 23m

$181

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 3/11

8:12 pm-5:09 pm

2 stops22h 57m

Seattle/Tacoma Intl

Mon 3/16

9:36 pm-12:15 pm

1 stop12h 39m

$183

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 3/11

8:12 pm-5:09 pm

2 stops22h 57m

Seattle/Tacoma Intl

Sun 3/15

12:24 pm-9:49 am

1 stop19h 25m

$185

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 3/4

7:00 am-9:42 am

Nonstop4h 42m

Seattle/Tacoma Intl

Thu 3/5

9:23 pm-11:19 am

1 stop11h 56m

$186

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 3/4

5:18 pm-11:01 am

2 stops19h 43m

Seattle/Tacoma Intl

Thu 3/5

9:23 pm-11:19 am

1 stop11h 56m

$188

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 2/13

7:00 am-9:42 am

Nonstop4h 42m

Seattle/Tacoma Intl

Mon 2/16

6:07 pm-11:59 pm

Nonstop3h 52m

$189

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 2/4

6:05 am-1:15 pm

1 stop9h 10m

Seattle/Tacoma Intl

Wed 2/11

9:55 am-8:35 pm

2 stops8h 40m

$191

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 3/11

7:00 am-9:42 am

Nonstop4h 42m

Seattle/Tacoma Intl

Sun 3/15

6:07 pm-11:59 pm

Nonstop3h 52m

$192

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 5/15

6:59 pm-12:01 am

1 stop7h 02m

Seattle/Tacoma Intl

Sun 5/24

6:05 am-4:45 pm

1 stop8h 40m

$193

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sun 3/1

7:00 am-9:42 am

Nonstop4h 42m

Seattle/Tacoma Intl

Thu 3/5

1:16 pm-9:49 am

1 stop18h 33m

$196

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 Seattle from

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

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 Seattle?

In general, October is the cheapest month to fly from St. Louis to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $249. If you don’t want to visit Seattle in October, then you should wait until November to fly from St. Louis, when ticket prices are also cheap, with an average price of $264.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from St. Louis is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $449. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $557.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from St. Louis in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $449 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $506. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

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

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $338 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from St. Louis for as low as $293 on momondo.

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

There are 4 cabin classes available to choose from on Lambert-St Louis to Seattle/Tacoma Intl 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 St. Louis to Seattle flights?

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

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

As of January 2026, prices for St. Louis to Seattle flights are approximately 4% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Seattle

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

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

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

Best Price Found

$163

Fastest flight time

4h 15m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from St. Louis in the past 72 hours is $163. The best round-trip flight deal from St. Louis to Seattle found on momondo in the last 72 hours is $320.
The fastest flight from St. Louis to Seattle takes 4h 15m
Direct flights go from St. Louis to Seattle every day.
There is 1 airport in Seattle. From St. Louis there are direct flights to Seattle/Tacoma Intl (SEA).
Search flight deals

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

    Lambert-St Louis and Seattle/Tacoma Intl are 1719.6 mi apart from one another. By plane, this route typically takes 4h 15m.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

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

Best airlines flying from St. Louis to Seattle

Compare and see reviews for airlines that fly from St. Louis to Seattle with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $94Free CancellationRating
7.9
8,021 reviews
Search Delta flights
FrontierPriceFrom $120Free CancellationRating
5.7
3,063 reviews
Search Frontier flights
SouthwestPriceFrom $176Free CancellationRating
8.0
4,249 reviews
Search Southwest flights
American AirlinesPriceFrom $188Free CancellationRating
7.2
11,090 reviews
Search American Airlines flights
United AirlinesPriceFrom $193Free CancellationRating
7.4
9,138 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $237Free CancellationRating
8.0
11,658 reviews
Search Alaska Airlines flights
Hawaiian AirlinesPriceFrom $237Free CancellationRating
7.8
2,824 reviews
Search Hawaiian Airlines flights

  • Alaska Airlines Flights From St. Louis to Seattle

    Alaska Airlines operates around 2 flights from St. Louis to Seattle every week. The average price of these flights found in the last 72 hours has been $381, but momondo users have found Alaska Airlines deals from St. Louis to Seattle from as low as $237 round-trip. Alaska Airlines has been scored 8.0/10 in 11,658 reviews.

  • Hawaiian Airlines Flights From St. Louis to Seattle

    Another popular option for St. Louis to Seattle flights is Hawaiian Airlines (7.8/10, 2,824 ratings). Hawaiian Airlines flies from St. Louis to Seattle around 5 times per week, with deals starting from $237 round-trip and rising to an average price of around $380.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Redmond
Tukwila
Federal Way
Cle Elum
Lakewood
Fife
Westport
Kirkland
Centralia
Shoreline

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Seattle. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo allows you to filter the results for St. Louis to Seattle flights to just show those with flexible booking policies.

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

Once all potential St. Louis to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of St. Louis to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Seattle trip

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