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$63+ Cheap flights from Missouri to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — SEA
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Missouri to Seattle

Cheapest flights from Missouri to Seattle
Explore the most affordable flight options available from Missouri to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This CheapOair deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1910:10 pmSTL - SEA
1 stop15h 21mFrontier
Thu 1/1512:19 pmSEA - STL
1 stop28h 13mFrontier
Deal found 12/16$268
This CheapOair deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:10 pmSTL - SEA
1 stop14h 01mFrontier
Sun 1/46:05 pmSEA - STL
1 stop25h 20mFrontier
Deal found 12/17$323
This CheapOair deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:43 pmSTL - SEA
1 stop18h 47mFrontier
Thu 1/11:25 pmSEA - STL
1 stop18h 37mFrontier
Deal found 12/16$338
This American Airlines deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:00 amSTL - SEA
1 stop9h 37mAmerican Airlines
Wed 1/77:35 amSEA - STL
1 stop6h 39mAmerican Airlines
Deal found 12/16$339
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/228:45 pmMCI - SEA
2 stops19h 09mMultiple Airlines
Fri 1/99:02 pmSEA - MCI
1 stop24h 31mMultiple Airlines
Deal found 12/15$358
This American Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/182:43 pmSTL - SEA
1 stop7h 38mAmerican Airlines
Thu 1/157:35 amSEA - STL
1 stop6h 39mAmerican Airlines
Deal found 12/17$369
This Super.com deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2310:10 pmSTL - SEA
1 stop17h 41mFrontier
Tue 12/302:54 pmSEA - STL
1 stop17h 08mFrontier
Deal found 12/16$380
This CheapOair deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2310:10 pmSTL - SEA
1 stop17h 41mFrontier
Mon 12/296:33 pmSEA - STL
1 stop24h 52mFrontier
Deal found 12/16$384
This CheapOair deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:10 pmSTL - SEA
1 stop17h 41mFrontier
Fri 1/22:54 pmSEA - STL
1 stop17h 08mFrontier
Deal found 12/16$388
This Delta deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/227:33 amMCI - SEA
Nonstop4h 12mDelta
Fri 1/95:55 pmSEA - MCI
Nonstop3h 28mDelta
Deal found 12/15$397
This CheapOair deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:10 pmSTL - SEA
1 stop14h 01mFrontier
Mon 12/296:33 pmSEA - STL
1 stop24h 52mFrontier
Deal found 12/17$398
This Delta deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:20 amSTL - SEA
1 stop7h 16mDelta
Wed 12/315:25 amSEA - STL
1 stop5h 58mDelta
Deal found 12/17$403

Find flight deals from Missouri to Seattle

Keep the following information in mind while searching for Missouri to Seattle flight deals. Data was last updated December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$138
(Kiwi.com)

One-way from

$63
(Trip.com)

Popular in

July

Cheapest in

October

Average price

$354

Good round-trip deal

$303 or less

Good one-way deal

$157 or less
Provider with most accurate pricing for Lambert-St Louis-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Seattle/Tacoma Intl flights.
Search Deals
From Missouri to Seattle/Tacoma Intl
Search Deals
One-way flight from Missouri to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Missouri to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Missouri to Seattle/Tacoma Intl.
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from Missouri to Seattle that are best for you.

Fly from

Missouri

Fly to

Seattle

Route

Depart

Return

Price

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 3/3

7:00 am-2:44 pm

1 stop9h 44m

Seattle/Tacoma Intl

Fri 3/6

1:38 pm-12:25 am

1 stop8h 47m

$177

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 3/11

7:15 am-2:45 pm

1 stop9h 30m

Seattle/Tacoma Intl

Mon 3/16

11:59 pm-8:50 am

1 stop6h 51m

$177

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 1/28

6:10 am-12:23 pm

1 stop8h 13m

Seattle/Tacoma Intl

Wed 1/28

11:10 pm-9:39 am

1 stop8h 29m

$177

Kansas CitySeattle

MCI - SEA

MCISEA

Kansas City

Tue 1/27

2:45 pm-4:51 pm

Nonstop4h 06m

Seattle/Tacoma Intl

Tue 2/3

8:15 am-1:50 pm

Nonstop3h 35m

$197

Kansas CitySeattle

MCI - SEA

MCISEA

Kansas City

Wed 1/14

2:45 pm-4:51 pm

Nonstop4h 06m

Seattle/Tacoma Intl

Wed 1/21

8:15 am-1:50 pm

Nonstop3h 35m

$197

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sat 1/31

6:19 pm-8:54 pm

Nonstop4h 35m

Seattle/Tacoma Intl

Tue 2/3

7:55 am-1:54 pm

Nonstop3h 59m

$197

Kansas CitySeattle

MCI - SEA

MCISEA

Kansas City

Tue 1/27

7:00 am-9:06 am

Nonstop4h 06m

Seattle/Tacoma Intl

Tue 2/3

5:55 pm-11:23 pm

Nonstop3h 28m

$197

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sat 2/14

2:47 pm-5:26 pm

Nonstop4h 39m

Seattle/Tacoma Intl

Tue 2/17

7:55 am-1:51 pm

Nonstop3h 56m

$197

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Mon 2/9

9:45 pm-5:15 pm

2 stops21h 30m

Seattle/Tacoma Intl

Thu 2/19

9:23 pm-9:26 pm

1 stop22h 03m

$198

Kansas CitySeattle

MCI - SEA

MCISEA

Kansas City

Fri 2/13

2:49 pm-4:54 pm

Nonstop4h 05m

Seattle/Tacoma Intl

Tue 2/17

8:21 am-1:55 pm

Nonstop3h 34m

$198

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 60 results
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Best time to book a flight from Missouri to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Missouri with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Missouri to Seattle

What is the cheapest month to book a flight from Missouri to Seattle?

Currently, April is the cheapest month in which you can book a flight from Missouri to Seattle (average of $121). Flying from Missouri to Seattle in August is currently the most expensive (average of $197). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from MO to SEA?

Find hourly flight availability from Missouri to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

One of the essential ways to save on airfare from Missouri to Seattle is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 15% on airfare.

What is the cheapest day to fly from Missouri to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Missouri to Seattle. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Missouri to Seattle flight should consider departing on Sunday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Missouri to Seattle

Explore weekly flight availability from Missouri to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated December 18, 2025.

The most flights from USMO to SEA are scheduled on a Thursday (13 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

Related info for your journey

Find useful and relevant information for your journey from Missouri to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Missouri?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Missouri to Seattle.

  • How popular is this Missouri to Seattle flight route?

    The Missouri to Seattle/Tacoma Intl flight path was viewed by 84 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Missouri to Seattle?

    Departing from Missouri to Seattle will take you 4h 06m. The distance from Missouri to Seattle is about 1485 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the most popular routes from Missouri to Seattle?

    While some choose either Lambert-St Louis - Seattle/Tacoma Intl or Springfield-Branson - Seattle/Tacoma Intl, Kansas City - Seattle/Tacoma Intl is the most popular route from Missouri to Seattle.

  • What are the most reliable airlines from Missouri to Seattle?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Missouri to Seattle on time: KLM (100%), Qatar Airways (85%), Japan Airlines (85%).

  • What are the cheapest flights from Missouri to Seattle?

    While on average a flight from Missouri to Seattle is generally $687, our data shows the cheapest flight currently is $127. When looking at the most popular route, (Kansas City - Seattle/Tacoma Intl), you can expect to pay $197 for that flight.

  • Can I find deals for flights from Missouri to Seattle that include hotel bookings?

    Yes. In addition to deals on Missouri to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Missouri to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Missouri to Seattle.

  • Can I find deals for business class flights from Missouri to Seattle?

    Yes. Cheapflights offers flight deals from Missouri to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Missouri to Seattle?

    Currently, April is the cheapest month in which you can book a flight from Missouri to Seattle (average of $121). Flying from Missouri to Seattle in August is currently the most expensive (average of $197). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

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

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Alternative routes for Missouri to Seattle

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Top 8 airlines flying from Missouri to Seattle

Discover the top 8 airlines that operate flights from Missouri to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$94Average$289FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$111Average$225FlexibilityNo cancel feeOn-time65%
FrontierCheapest$119Average$237FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$149Average$377FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$176Average$382FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$188Average$485FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$193Average$439FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$237Average$471FlexibilityNo cancel feeOn-time75%

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