Cheap flights from Seattle to St. Louis (SEA - STL) from $57

This is the cheapest one-way flight price, found on 12/6. Prices may vary by date and flight preferences.
SEA — STL
déc. 12 — déc. 191

The best prices from Seattle/Tacoma Intl to Lambert-St Louis are usually found in September or October, booked 50 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

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How to find the cheapest flight from Seattle (SEA) to St. Louis (STL)

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated décembre 7, 2023.

Popular in

June

Cheapest in

September

Round-trip from

$302

One-way from

$57
High demand for flights, 23% potential price rise
Best time to find cheap flights, 22% potential price drop
From Seattle/Tacoma Intl to Lambert-St Louis
One-way flight from Seattle/Tacoma Intl to Lambert-St Louis

What is the cheapest day to fly round-trip from Seattle to St. Louis?

Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to St. Louis. Check prices with Cheapflights to find a great deal for your trip.

How far in advance should I book a flight from Seattle to St. Louis?

To save on the cost of your flight from Seattle to St. Louis, book at least 51 days before your planned departure. Booking around this time can save you about 105% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $344 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $460.

What is the cheapest month to fly from Seattle to St. Louis?

September can be a great time to fly to St. Louis from Seattle with a flight ticket averaging about $381. Cheapflights users have found deals in the month of September for as cheap as $144. The most expensive prices can be found in the month of June.

When is the cheapest time to fly from Seattle to St. Louis (SEA - STL)?

When flying from Seattle to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 35% versus a flight at noon.

Cheap American Airlines flights from Seattle to St. Louis

Explore cheap flight options specifically provided by American Airlines for the route between Seattle and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,618,515 searches. Data last updated décembre 7, 2023.
Take a peek at the cheapest American Airlines flights we've detected traveling from Seattle to St. Louis. Make sure to check back often as deals are often changing.
  • If you’re traveling from Seattle to St. Louis, one of the more common airlines traveling that route is American Airlines. Flights from American Airlines traveling this route typically cost $366.80 RT. This price is typically 42% more expensive than other airlines that offer Seattle to St. Louis flights. When booking this route, the cheapest RT price found was $167. The most popular departure airport in Seattle when flying to St. Louis is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting St. Louis is Lambert-St Louis Airport. When flying from Seattle to St. Louis, American Airlines flights are 14% more popular than any other airline flying that same route.

Cheap Frontier flights from Seattle to St. Louis

Explore cheap flight options specifically provided by Frontier for the route between Seattle and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,618,515 searches. Data last updated décembre 7, 2023.
Some of the lowest-priced Frontier flights we've found at this time heading from Seattle to St. Louis. Deals are refreshing constantly so come back soon for more options.
  • One of the most popular airlines traveling from Seattle to St. Louis is Frontier. Flights from Frontier traveling this route typically cost $537.80 RT. This price is typically 29% cheaper than other airlines that offer Seattle to St. Louis flights. When booking this route, the cheapest RT price found was $196. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to St. Louis. Lambert-St Louis Airport is the most popular arrival airport in St. Louis. When flying from Seattle to St. Louis, Frontier flights are 1% more popular than any other airline flying that same route.

Cheap Seattle to St. Louis flights in December & January 2023

Find cheap flight options from Seattle to St. Louis specifically for the months of December and January 2023. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,618,515 searches. Prices were last updated on décembre 7, 2023.
Listed are some of the best fares we've found on flights departing from Seattle to St. Louis in 2023. Check back regularly for other flight deals.

Seattle to St. Louis 2023 flight deals

Discover exclusive flight deals for travel between Seattle and St. Louis in 2023. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,618,515 searches. Data last updated décembre 7, 2023.
Listed are some of the best fares we've found on flights departing from Seattle to St. Louis in 2023. Check back regularly for other flight deals.

Non-stop flights to St. Louis from Seattle

Discover non-stop flight options from Seattle to St. Louis. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,618,515 searches. Data last updated décembre 7, 2023.
Consider booking one of these non-stop flights heading from Seattle to St. Louis. Select from other flights from Seattle to St. Louis by using the search form above.

Seattle to St. Louis flights leaving soon

Find last-minute flight options from Seattle to St. Louis for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,618,515 searches. Data last updated décembre 7, 2023.
Check out these flights departing soon from Seattle to St. Louis. To prevent any unwanted surprises, users should verify their flight info before booking.

One-way flights to St. Louis from Seattle

Search for one-way flight options from Seattle to St. Louis. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,618,515 searches. Data last updated décembre 7, 2023.
Users in need of a one-way flight from Seattle to St. Louis can choose from these deals. Those seeking round-trip flights from Seattle to St. Louis should utilize the search form at the the top of the page.

Find flights from Seattle to St. Louis within your budget

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, Cheapflights users made 2,618,515 searches. Data last updated décembre 7, 2023.

Fly from

Any airport

Fly to

Any airport

Budget

$154 - $372

Route

Depart

Return

Price

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

ven. 2/2

1 stop8h 17m

Lambert-St Louis

lun. 2/5

1 stop10h 51m

$154

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jeu. 2/1

1 stop7h 14m

Lambert-St Louis

lun. 2/5

1 stop10h 51m

$155

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jeu. 1/11

1 stop7h 14m

Lambert-St Louis

dim. 1/14

1 stop7h 05m

$157

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jeu. 1/11

1 stop11h 01m

Lambert-St Louis

lun. 1/15

1 stop19h 47m

$158

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

ven. 1/12

1 stop11h 14m

Lambert-St Louis

lun. 1/15

1 stop19h 47m

$168

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jeu. 1/11

2 stops11h 17m

Lambert-St Louis

lun. 1/15

1 stop19h 47m

$180

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

jeu. 1/11

Nonstop3h 47m

Lambert-St Louis

lun. 1/15

Nonstop4h 42m

$197

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

mer. 4/3

1 stop8h 57m

Lambert-St Louis

ven. 4/5

1 stop7h 51m

$237

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

ven. 2/2

2 stops11h 11m

Lambert-St Louis

lun. 2/5

1 stop9h 47m

$372

Flights are sorted by cheapest first

Deals found on 12/6

Average price of flights to St. Louis by month

Plan your trip from Seattle to St. Louis by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to St. Louis is currently 87.89 USD while a round-trip flight costs 197.56 USD. Price data was last updated on December 3, 2023.

Currently, February is the cheapest month in which you can book a flight from Seattle to St. Louis (average of $302). Flying from Seattle to St. Louis in June is currently the most expensive (average of $390). 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.

January

$332

February

$302

March

$341

April

$368

May

$361

June

$390

July

$383

August

$337

September

$324

October

$323

November

$335

December

$326

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated décembre 7, 2023.
Get a feel of what it's like to fly with American Airlines, Frontier and Alaska Airlines from Seattle to St. Louis by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
1,404 reviews

Overall

8.1

Boarding

8.3

Crew

8.6

Food

7.2

Comfort

8.0

Entertainment

7.2

Reviews

1 / 10

Excellent airlines the price was great service was excellent plane was very comfortable

8.1
Very good
1,404 reviews
8.1
Very good
1,404 reviews

Overall

8.1

Boarding

8.3

Crew

8.6

Food

7.2

Comfort

8.0

Entertainment

7.2

Reviews

1 / 10

Excellent airlines the price was great service was excellent plane was very comfortable

7.9
Good
3,035 reviews
8.1
Very good
1,404 reviews

Overall

8.1

Boarding

8.3

Crew

8.6

Food

7.2

Comfort

8.0

Entertainment

7.2

Reviews

1 / 10

Excellent airlines the price was great service was excellent plane was very comfortable

7.4
Good
1,902 reviews
8.1
Very good
1,404 reviews

Overall

8.1

Boarding

8.3

Crew

8.6

Food

7.2

Comfort

8.0

Entertainment

7.2

Reviews

1 / 10

Excellent airlines the price was great service was excellent plane was very comfortable

7.2
Good
2,645 reviews
8.1
Very good
1,404 reviews

Overall

8.1

Boarding

8.3

Crew

8.6

Food

7.2

Comfort

8.0

Entertainment

7.2

Reviews

1 / 10

Excellent airlines the price was great service was excellent plane was very comfortable

6.3
Okay
1,498 reviews
8.1
Very good
1,404 reviews

Overall

8.1

Boarding

8.3

Crew

8.6

Food

7.2

Comfort

8.0

Entertainment

7.2

Reviews

1 / 10

Excellent airlines the price was great service was excellent plane was very comfortable

Average temperature in St. Louis by month

Plan your trip to St. Louis by selecting the month that matches your preferred temperature. July sees the highest average temperature while January sees the lowest average temperature. Temperature data was last updated on December 3, 2023.

STL

Temperature

32 - 80.6 °F

Average rainfall in St. Louis by month

Keep in mind the precipitation totals in St. Louis when planning your trip. St. Louis sees an average of 3.40 precipitation per year with the most occurring in May. Precipitation data was last updated on December 3, 2023.

STL

Rainfall

2.2 - 4.7 inches

Related info for your journey

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

What airports do I use to fly from Seattle to St. Louis?

If you book a flight from Seattle to St. Louis, you will be flying from Seattle/Tacoma Intl to Lambert-St Louis. Flights to Lambert-St Louis (STL) from Seattle/Tacoma Intl (SEA) take 3h 47m for a nonstop flight. There are 6 flights from Seattle/Tacoma Intl to St. Louis per day from 6 airlines.

Can I find flights from Seattle to St. Louis for under $200 on Cheapflights?

Yes, there are multiple flights from Seattle to St. Louis for under $200. The cheapest flight booked recently is on American Airlines for just $154, but on average you can expect to pay $199.

Are there nonstop flights from Seattle to St. Louis for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to St. Louis under $200. A good price for a nonstop flight from Seattle to St. Louis is less than $396.

Are there last-minute flights available from Seattle to St. Louis for under $300?

There are currently 20+ open flights from Seattle to St. Louis within the next 7 days for less than $300.

What days are nonstop flights available from Seattle to St. Louis?

You can find nonstop flights on the following days: Sunday, Monday, Tuesday, Thursday, Friday, Saturday.

How popular is this Seattle to St. Louis flight route?

How many flights depart from Seattle to St. Louis on average per day?

On average 13 flights depart from Seattle to St. Louis per day.
Morning (6am - Noon) - 54% of flight departures
Evening (6pm - Midnight) - 46% of flight departures

How long is the flight from Seattle to St. Louis?

American Airlines, Frontier, and Alaska Airlines can get you from Seattle to St. Louis in just under 3h 47m. Your travel time can differ by up to 7h 14m. Airlines will cover a distance of 1714 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from Seattle to St. Louis round-trip?

Cheapflights users have booked flights from Seattle to St. Louis round-trip from $154. Other airlines that can offer you cheap pricing are Frontier, from $158, and Alaska Airlines, from $197. These flights start at 59% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from Seattle to St. Louis one-way?

$57 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on American Airlines and Frontier, with prices starting from $77 and $96, respectively.

What are the most popular airlines that fly from Seattle to St. Louis?

What are the most reliable airlines from Seattle to St. Louis?

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 Seattle to St. Louis on time: Qatar Airways (90%), Japan Airlines (90%), Singapore Airlines (88%).

What are the cheapest flights from Seattle to St. Louis?

The cheapest flight price from Seattle to St. Louis is $99. On average you can expect to pay $285. The most popular route, (Seattle/Tacoma Intl - Lambert-St Louis), can usually be booked for $168.

What does SEA to STL mean?

SEA stands for Seattle/Tacoma Intl Airport, while STL stands for Lambert-St Louis Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 6 airlines flying from Seattle to St. Louis

Discover the top 6 airlines that operate flights from Seattle to St. Louis. 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 2,618,515 searches. Data last updated décembre 7, 2023.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$124Average$375FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
FrontierCheapest$126Average$246FlexibilityNo cancel feeOn-time62%
Search Frontier flights
United AirlinesCheapest$138Average$344FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Spirit AirlinesCheapest$157Average$300FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
Alaska AirlinesCheapest$167Average$367FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
American AirlinesCheapest$196Average$538FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Search flights to St. Louis by cabin class

Hourly flight availability from Seattle to St. Louis

Find hourly flight availability from Seattle to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated décembre 7, 2023.
1%of flight departuresEarly morningMidnight to 6 am
54%of flight departuresMorning6 am to noon
45%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to St. Louis

Explore weekly flight availability from Seattle to St. Louis. 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 décembre 7, 2023.
Sunday9daily flights
Monday8daily flights
Tuesday4daily flights
Wednesday8daily flights
Thursday4daily flights
Friday8daily flights
Saturday3daily flights

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to St. Louis?

Cheapflights makes it easy to find Seattle to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Seattle to St. Louis?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to St. Louis from Seattle.

Can Cheapflights find flights from Seattle to St. Louis with no change fees?

Yes, we can. To see specific flights from Seattle to St. Louis with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to St. Louis become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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