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Cheap flights from Missouri to Seattle from $61

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Missouri to Seattle departing on 12/6. 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 Missouri to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
1:35 pm - 9:00 pmSTL-SEA
9h 25m2 stops
United Airlines Logo
7:00 am - 3:40 pmSEA-STL
6h 40m1 stop
$189United Airlines
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Tue, Dec 9 - Tue, Dec 16
Frontier Logo
7:43 pm - 12:14 pmSTL-SEA
18h 31m1 stop
Frontier Logo
12:48 pm - 8:59 amSEA-STL
18h 11m2 stops
$191Frontier
Find Deal
Wed, Dec 3 - Sun, Dec 7
American Airlines Logo
3:37 pm - 11:51 pmSTL-SEA
10h 14m1 stop
American Airlines Logo
9:45 pm - 9:40 amSEA-STL
9h 55m1 stop
$193American Airlines
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Thu, Jan 15 - Mon, Jan 19
Frontier Logo
7:43 pm - 12:14 pmSTL-SEA
18h 31m1 stop
Frontier Logo
12:48 pm - 8:59 amSEA-STL
18h 11m2 stops
$195Frontier
Find Deal
Wed, Dec 3 - Sun, Dec 7
Hawaiian Airlines Logo
7:00 am - 9:26 amSTL-SEA
4h 26mnonstop
Hawaiian Airlines Logo
6:00 pm - 11:56 pmSEA-STL
3h 56mnonstop
$197Hawaiian Airlines
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Sat, Feb 28 - Tue, Mar 3
Delta Logo
6:00 am - 10:54 amSTL-SEA
6h 54m1 stop
Delta Logo
6:00 am - 5:00 pmSEA-STL
9h 00m1 stop
$198Delta
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Tue, Dec 16 - Thu, Jan 1
Multiple Airlines Logo
9:47 pm - 9:36 amSTL-SEA
13h 49m1 stop
Multiple Airlines Logo
7:55 am - 1:54 pmSEA-STL
3h 59mnonstop
$204Multiple Airlines
Find Deal
Thu, Jan 15 - Mon, Jan 19
Delta Logo
6:59 pm - 12:11 amSTL-SEA
7h 12m1 stop
Delta Logo
9:55 am - 8:39 pmSEA-STL
8h 44m1 stop
$209Delta
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Fri, Mar 20 - Wed, Mar 25
American Airlines Logo
11:35 am - 6:55 pmSTL-SEA
9h 20m1 stop
American Airlines Logo
12:31 am - 8:50 amSEA-STL
6h 19m1 stop
$216American Airlines
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Wed, Dec 3 - Sat, Dec 6
Multiple Airlines Logo
9:54 pm - 1:22 pmSTL-SEA
17h 28m1 stop
Multiple Airlines Logo
6:00 pm - 11:54 pmSEA-STL
3h 54mnonstop
$222Multiple Airlines
Find Deal
Tue, Nov 25 - Fri, Nov 28

United Airlines flights from Missouri to Seattle

Our best United Airlines deals on Missouri to Seattle flight tickets
United Airlines
Dec 9
STL1:35 pmLambert-St Louis
9h 25m
2 stops
SEA9:00 pmSeattle/Tacoma Intl
Dec 16
SEA7:00 amSeattle/Tacoma Intl
6h 40m
1 stop
STL3:40 pmLambert-St Louis
$189
Find similar
United Airlines
Dec 2
STL5:30 pmLambert-St Louis
7h 45m
1 stop
SEA11:15 pmSeattle/Tacoma Intl
Dec 9
SEA7:00 amSeattle/Tacoma Intl
6h 40m
1 stop
STL3:40 pmLambert-St Louis
$220
Find similar
United Airlines
Jan 18
MCI1:42 pmKansas City
9h 30m
2 stops
SEA9:12 pmSeattle/Tacoma Intl
Jan 24
SEA10:58 amSeattle/Tacoma Intl
6h 59m
1 stop
MCI7:57 pmKansas City
$222
Find similar

Frontier flights from Missouri to Seattle

Our best Frontier deals on Missouri to Seattle flight tickets
Frontier
Dec 3
STL7:43 pmLambert-St Louis
18h 31m
1 stop
SEA12:14 pmSeattle/Tacoma Intl
Dec 7
SEA12:48 pmSeattle/Tacoma Intl
18h 11m
2 stops
STL8:59 amLambert-St Louis
$191
Find similar
Frontier
Dec 3
STL7:43 pmLambert-St Louis
18h 31m
1 stop
SEA12:14 pmSeattle/Tacoma Intl
Dec 7
SEA12:48 pmSeattle/Tacoma Intl
18h 11m
2 stops
STL8:59 amLambert-St Louis
$195
Find similar
Frontier
Dec 11
STL1:16 pmLambert-St Louis
22h 50m
1 stop
SEA10:06 amSeattle/Tacoma Intl
Dec 13
SEA12:48 pmSeattle/Tacoma Intl
21h 24m
2 stops
STL12:12 pmLambert-St Louis
$202
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Missouri 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 November 6, 2025.
Use the filters below to find and compare flights from Missouri to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 12/9

1:35 pm-9:00 pm

2 stops9h 25m

Seattle/Tacoma Intl

Tue 12/16

7:00 am-3:40 pm

1 stop6h 40m

$189

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 12/3

7:43 pm-12:14 pm

1 stop18h 31m

Seattle/Tacoma Intl

Sun 12/7

12:48 pm-8:59 am

2 stops18h 11m

$191

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Thu 1/15

3:37 pm-11:51 pm

1 stop10h 14m

Seattle/Tacoma Intl

Mon 1/19

9:45 pm-9:40 am

1 stop9h 55m

$193

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 12/3

7:43 pm-12:14 pm

1 stop18h 31m

Seattle/Tacoma Intl

Sun 12/7

12:48 pm-8:59 am

2 stops18h 11m

$195

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sat 2/28

7:00 am-9:26 am

Nonstop4h 26m

Seattle/Tacoma Intl

Tue 3/3

6:00 pm-11:56 pm

Nonstop3h 56m

$197

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 12/16

6:00 am-10:54 am

1 stop6h 54m

Seattle/Tacoma Intl

Thu 1/1

6:00 am-5:00 pm

1 stop9h 00m

$198

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Thu 1/15

9:47 pm-9:36 am

1 stop13h 49m

Seattle/Tacoma Intl

Mon 1/19

7:55 am-1:54 pm

Nonstop3h 59m

$204

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 3/20

6:59 pm-12:11 am

1 stop7h 12m

Seattle/Tacoma Intl

Wed 3/25

9:55 am-8:39 pm

1 stop8h 44m

$209

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 12/3

11:35 am-6:55 pm

1 stop9h 20m

Seattle/Tacoma Intl

Sat 12/6

12:31 am-8:50 am

1 stop6h 19m

$216

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 11/25

9:54 pm-1:22 pm

1 stop17h 28m

Seattle/Tacoma Intl

Fri 11/28

6:00 pm-11:54 pm

Nonstop3h 54m

$222

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Missouri 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 Missouri to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $273. If you don’t want to visit Seattle in October, then you should wait until September to fly from Missouri, when ticket prices are also cheap, with an average price of $296.

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

On average, the least expensive day to fly to Seattle from Missouri is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $458. 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 Missouri because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $569.

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

Flying to Seattle from Missouri in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $447 when looking at flights departing in the afternoon. Flights to Seattle are more costly at noon, with an average ticket price of $526. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Missouri to Seattle/Tacoma Intl flight route?

Fly from Kansas City to Seattle/Tacoma Intl for the best Missouri - 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 Missouri when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $348 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Missouri for as low as $296 on momondo.

What cabin class options are available on Missouri to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Missouri 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 Missouri to Seattle flights?

You could potentially save up to 13% on your flight if you consider stops on a Missouri to Seattle flight.

Cheap Missouri to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Missouri to Seattle

Best Price Found

$238

Fastest flight time

3h 59m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Missouri in the past 72 hours is $238. The best round-trip flight deal from Missouri to Seattle found on momondo in the last 72 hours is $348.
The fastest flight from Missouri to Seattle takes 3h 59m
Direct flights go from Missouri to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

  • When did momondo last update prices for flights from Missouri to Seattle/Tacoma Intl Airport?

    Prices for flights from Missouri to Seattle/Tacoma Intl Airport refresh daily.

  • How many operators does momondo search for flights from Missouri to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Missouri to Seattle/Tacoma Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Missouri to Seattle/Tacoma Intl Airport.

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

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Missouri to Seattle?

Best airlines flying from Missouri to Seattle

Compare and see reviews for airlines that fly from Missouri to Seattle with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $94Free CancellationRating
7.9
8,004 reviews
Search Delta flights
Spirit AirlinesPriceFrom $111Free CancellationRating
6.3
8,114 reviews
Search Spirit Airlines flights
FrontierPriceFrom $119Free CancellationRating
5.8
3,116 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $149Free CancellationRating
7.8
2,804 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $176Free CancellationRating
8.0
4,240 reviews
Search Southwest flights
American AirlinesPriceFrom $188Free CancellationRating
7.2
11,041 reviews
Search American Airlines flights
United AirlinesPriceFrom $216Free CancellationRating
7.4
9,003 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $238Free CancellationRating
8.0
11,243 reviews
Search Alaska Airlines flights

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
Puyallup
Marysville
Redmond
Tukwila
Lakewood
Federal Way
Fife
Cle Elum
Centralia
Kirkland
Westport
Shoreline

Why use momondo?

Why should I use momondo to find a flight deal from Missouri to Seattle?

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

Can I find flights from Missouri to Seattle with flexible booking policies on momondo?

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

How can momondo help me find flights from Missouri to Seattle?

Once you have performed a search for Missouri to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

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

An easier way to manage your Seattle 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.
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