How does KAYAK find such low prices on flights from Washington to St. Louis?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to St. Louis. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to St. Louis?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Washington is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Washington to St. Louis?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Washington with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to St. Louis?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$62 CHEAP FLIGHTS from Washington to St. Louis

STL

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals

Cheap Flights from Washington to St. Louis

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Washington to St. Louis

Wed, Dec 3 - Tue, Dec 9

11:15 am - 7:06 pmSEA-STL

5h 51m1 stop

2:36 pm - 10:15 pmSTL-SEA

9h 39m1 stop

$177Delta

Find Deal

Tue, Sep 30 - Tue, Oct 7

10:45 pm - 7:35 amSEA-STL

6h 50m1 stop

3:00 pm - 10:00 pmSTL-SEA

9h 00m2 stops

$183Southwest

Find Deal

Mon, Sep 29 - Fri, Oct 3

4:36 pm - 9:06 amSEA-STL

14h 30m2 stops

7:55 pm - 12:30 amSTL-SEA

6h 35m1 stop

$188Frontier

Find Deal

Wed, Dec 3 - Thu, Dec 11

12:31 am - 8:50 amSEA-STL

6h 19m1 stop

2:09 pm - 8:56 pmSTL-SEA

8h 47m1 stop

$189American Airlines

Find Deal

Fri, Oct 3 - Sun, Oct 5

6:12 am - 9:06 amSEA-STL

24h 54m1 stop

7:55 pm - 12:30 amSTL-SEA

6h 35m1 stop

$195Frontier

Find Deal

Thu, Oct 30 - Tue, Nov 4

7:35 am - 11:59 pmGEG-STL

14h 24m1 stop

7:00 am - 12:26 pmSTL-GEG

7h 26m1 stop

$206Alaska Airlines

Find Deal

Tue, Sep 30 - Tue, Oct 7

7:00 am - 9:06 amSEA-STL

24h 06m1 stop

6:33 am - 9:05 amSTL-SEA

4h 32mnonstop

$210

Find Deal

Fri, Oct 17 - Tue, Oct 21

8:43 pm - 9:07 amSEA-STL

10h 24m1 stop

3:57 pm - 6:25 pmSTL-SEA

4h 28mnonstop

$211

Find Deal

Sat, Dec 6 - Sat, Dec 13

8:34 am - 2:27 pmSEA-STL

3h 53mnonstop

7:00 am - 9:40 amSTL-SEA

4h 40mnonstop

$237Alaska Airlines

Find Deal

Thu, Oct 23 - Mon, Oct 27

11:58 pm - 8:09 amPDX-STL

6h 11m1 stop

5:11 am - 10:56 amSTL-PDX

7h 45m1 stop

$249American Airlines

Find Deal

Cheapest round-trip

$177

Overall average: $466

Delta

Wed 12/3Tue 12/9

SEA - STL • 1 stop

Cheapest non-stop

$233

Typical prices: $280-623

Hawaiian Airlines

Sat 10/11Sat 10/18

SEA - STL • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to St. Louis!

Useful Info

Low season	January
High season	October
Cheapest flight	$62

Best time to beat the crowds with an average 3% drop in price.

Most popular time to fly and prices are also 7% lower on average.

Flight from Seattle to St. Louis

Verified travelerFlew with Alaska AirlinesSEA-STLJul 2025

Give yourself extra time. Love the self check in options.

Verified travelerFlew with Alaska AirlinesSEA-STLFeb 2024

Be sure to measure your wheels for carry on my luggage was the correct size but the wheels made it over so had to check my bag wasn't happy about that since you have to pay for checked should at least get one free.

How does KAYAK find such low prices on flights from Washington to St. Louis?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to St. Louis.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to St. Louis?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Washington is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Washington to St. Louis?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Washington with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to St. Louis?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

O'Fallon

Wentzville

Farmington

Eureka

Litchfield

Grafton

Glencoe

Shrewsbury

Everything you need to know for your flight to St. Louis

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in St. Louis

St. Louis (STL)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

STL

$62 Find Cheap Flights from Washington to St. Louis

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

Cheap Flights from Washington to St. Louis

Recent round-trip flight deals from Washington to St. Louis

Recent one-way flight deals from Washington to St. Louis

Recent last minute flight deals from Washington to St. Louis

Recent direct flight deals from Washington to St. Louis

Everything you should know

Good to know

Flights from Washington to St. Louis: the best tips from KAYAK users

FAQs for booking flights from Washington to St. Louis

How does KAYAK find such low prices on flights from Washington to St. Louis?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to St. Louis.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to St. Louis?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Washington is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Washington to St. Louis?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Washington with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to St. Louis?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near St. Louis?

Everything you need to know for your flight to St. Louis

Information on the airport you'll fly into in St. Louis

Cabin class types available on flights to Washington

Complete your trip to St. Louis with a hotel stay or car rental

Find direct flights for St. Louis

Flights to other popular destinations

Flights from domestic origins to St. Louis

Choose which airport to fly into in St. Louis

Find deals for your return flight