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Cheap flights from Missouri to Seattle from $71

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 4/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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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.
Frontier Logo
8:12 pm - 9:27 am
STL
-
SEA
15h 15m
1 stop
Frontier Logo
6:57 pm - 7:12 pm
SEA
-
STL
22h 15m
1 stop
$173Frontier
Mon, May 11 - Sun, May 17
Multiple Airlines Logo
4:39 pm - 12:01 pm
MCI
-
SEA
21h 22m
1 stop
Multiple Airlines Logo
7:33 pm - 11:33 pm
SEA
-
MCI
26h 00m
1 stop
$174Multiple Airlines
Wed, Feb 25 - Tue, Mar 3
Delta Logo
2:27 pm - 10:01 pm
STL
-
SEA
9h 34m
1 stop
Delta Logo
5:30 am - 1:32 pm
SEA
-
STL
6h 02m
1 stop
$177Delta
Fri, May 8 - Tue, May 12
Frontier Logo
4:39 pm - 12:01 pm
MCI
-
SEA
21h 22m
1 stop
Frontier Logo
1:16 pm - 7:55 pm
SEA
-
MCI
28h 39m
1 stop
$177Frontier
Wed, Feb 25 - Thu, Mar 5
American Airlines Logo
6:50 pm - 12:55 am
STL
-
SEA
8h 05m
1 stop
American Airlines Logo
12:07 am - 11:35 am
SEA
-
STL
9h 28m
1 stop
$184American Airlines
Wed, Mar 25 - Tue, Mar 31
Hawaiian Airlines Logo
2:47 pm - 5:26 pm
STL
-
SEA
4h 39mnonstop
Hawaiian Airlines Logo
7:55 am - 1:51 pm
SEA
-
STL
3h 56mnonstop
$188Hawaiian Airlines
Sat, Feb 28 - Sat, Mar 7
American Airlines Logo
8:03 pm - 12:51 am
STL
-
SEA
6h 48m
1 stop
American Airlines Logo
11:55 pm - 8:54 am
SEA
-
STL
6h 59m
1 stop
$193American Airlines
Thu, Apr 9 - Mon, Apr 13
Hawaiian Airlines Logo
2:49 pm - 4:54 pm
MCI
-
SEA
4h 05mnonstop
Hawaiian Airlines Logo
8:21 am - 1:55 pm
SEA
-
MCI
3h 34mnonstop
$196Hawaiian Airlines
Wed, Mar 4 - Wed, Mar 11
Alaska Airlines Logo
3:50 pm - 6:23 pm
STL
-
SEA
4h 33mnonstop
Alaska Airlines Logo
5:57 pm - 11:59 pm
SEA
-
STL
4h 02mnonstop
$197Alaska Airlines
Tue, Apr 21 - Sat, Apr 25
Delta Logo
7:59 pm - 12:12 am
STL
-
SEA
6h 13m
1 stop
Delta Logo
5:30 am - 5:16 pm
SEA
-
STL
9h 46m
1 stop
$198Delta
Thu, May 7 - Sat, May 9

Delta flights from Missouri to Seattle

Our best Delta deals on Missouri to Seattle flight tickets
Delta
May 8
STL2:27 pmLambert-St Louis
9h 34m
1 stop
SEA10:01 pmSeattle/Tacoma Intl
May 12
SEA5:30 amSeattle/Tacoma Intl
6h 02m
1 stop
STL1:32 pmLambert-St Louis
$177
Delta
May 7
STL7:59 pmLambert-St Louis
6h 13m
1 stop
SEA12:12 amSeattle/Tacoma Intl
May 19
SEA5:30 amSeattle/Tacoma Intl
6h 02m
1 stop
STL1:32 pmLambert-St Louis
$198
Delta
Mar 10
MCI7:55 amKansas City
4h 03m
SEA9:58 amSeattle/Tacoma Intl
Mar 25
SEA5:50 pmSeattle/Tacoma Intl
3h 26m
MCI11:16 pmKansas City
$207

Southwest flights from Missouri to Seattle

Our best Southwest deals on Missouri to Seattle flight tickets
Southwest
Mar 6
STL3:50 pmLambert-St Louis
10h 25m
2 stops
SEA12:15 amSeattle/Tacoma Intl
Mar 9
SEA3:45 pmSeattle/Tacoma Intl
7h 20m
1 stop
STL1:05 amLambert-St Louis
$248
Southwest
Feb 25
STL3:50 pmLambert-St Louis
9h 15m
2 stops
SEA11:05 pmSeattle/Tacoma Intl
Mar 1
SEA5:50 amSeattle/Tacoma Intl
7h 55m
1 stop
STL3:45 pmLambert-St Louis
$249
Southwest
Mar 9
STL5:30 amLambert-St Louis
9h 10m
1 stop
SEA12:40 pmSeattle/Tacoma Intl
Mar 24
SEA9:50 amSeattle/Tacoma Intl
9h 35m
2 stops
STL9:25 pmLambert-St Louis
$254

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 February 8, 2026.
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

Mon 5/11

8:12 pm-9:27 am

1 stop15h 15m

Seattle/Tacoma Intl

Sun 5/17

6:57 pm-7:12 pm

1 stop22h 15m

$173

Kansas CitySeattle

MCI - SEA

MCISEA

Kansas City

Wed 2/25

4:39 pm-12:01 pm

1 stop21h 22m

Seattle/Tacoma Intl

Tue 3/3

7:33 pm-11:33 pm

1 stop26h 00m

$174

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 5/8

2:27 pm-10:01 pm

1 stop9h 34m

Seattle/Tacoma Intl

Tue 5/12

5:30 am-1:32 pm

1 stop6h 02m

$177

Kansas CitySeattle

MCI - SEA

MCISEA

Kansas City

Wed 2/25

4:39 pm-12:01 pm

1 stop21h 22m

Seattle/Tacoma Intl

Thu 3/5

1:16 pm-7:55 pm

1 stop28h 39m

$177

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 3/25

6:50 pm-12:55 am

1 stop8h 05m

Seattle/Tacoma Intl

Tue 3/31

12:07 am-11:35 am

1 stop9h 28m

$184

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sat 2/28

2:47 pm-5:26 pm

Nonstop4h 39m

Seattle/Tacoma Intl

Sat 3/7

7:55 am-1:51 pm

Nonstop3h 56m

$188

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Thu 4/9

8:03 pm-12:51 am

1 stop6h 48m

Seattle/Tacoma Intl

Mon 4/13

11:55 pm-8:54 am

1 stop6h 59m

$193

Kansas CitySeattle

MCI - SEA

MCISEA

Kansas City

Wed 3/4

2:49 pm-4:54 pm

Nonstop4h 05m

Seattle/Tacoma Intl

Wed 3/11

8:21 am-1:55 pm

Nonstop3h 34m

$196

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 4/21

3:50 pm-6:23 pm

Nonstop4h 33m

Seattle/Tacoma Intl

Sat 4/25

5:57 pm-11:59 pm

Nonstop4h 02m

$197

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Thu 5/7

7:59 pm-12:12 am

1 stop6h 13m

Seattle/Tacoma Intl

Sat 5/9

5:30 am-5:16 pm

1 stop9h 46m

$198

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 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 $249. If you don’t want to visit Seattle in October, then you should wait until November to fly from Missouri, 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 Missouri is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $450. 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 $563.

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 $443 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $504. Departure times in the morning 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 Lambert-St Louis 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 $339 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 $294 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?

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

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

$160

Fastest flight time

3h 58m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Missouri in the past 72 hours is $160. The best round-trip flight deal from Missouri to Seattle found on momondo in the last 72 hours is $292.
The fastest flight from Missouri to Seattle takes 3h 58m
Direct flights go from Missouri to Seattle every day.
There is 1 airport in Seattle. From Missouri there are direct flights to 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
8,172 reviews
Search Delta flights
FrontierPriceFrom $100Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $111Free CancellationRating
6.3
8,430 reviews
Search Spirit Airlines flights
Hawaiian AirlinesPriceFrom $138Free CancellationRating
7.8
2,829 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $176Free CancellationRating
8.0
4,280 reviews
Search Southwest flights
American AirlinesPriceFrom $176Free CancellationRating
7.2
11,249 reviews
Search American Airlines flights
United AirlinesPriceFrom $179Free CancellationRating
7.4
9,254 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $209Free CancellationRating
8.0
11,851 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
Marysville
Redmond
Puyallup
Cle Elum
Tukwila
Lakewood
Federal Way
Westport
Kirkland
Centralia
Fife
Tumwater

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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