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>

$68 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

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

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

Cheapest round-trip

$213

Overall average: $280

Frontier

Sun 1/4Sun 1/11

PDX - STL • 1 stop

Cheapest non-stop

$229

Alaska Airlines

Thu 5/21Wed 5/27

PDX - 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!

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

Sun, Jan 4 - Sun, Jan 11

12:47 pm - 10:02 am

PDX

STL

19h 15m1 stop

9:46 pm - 9:34 am

STL

PDX

13h 48m1 stop

$213Frontier

Thu, May 21 - Wed, May 27

11:25 am - 5:13 pm

PDX

STL

3h 48mnonstop

6:20 pm - 8:30 pm

STL

PDX

4h 10mnonstop

$229Alaska Airlines

Thu, Jan 8 - Sun, Jan 11

12:05 pm - 12:12 pm

PDX

STL

22h 07m2 stops

12:37 pm - 9:34 am

STL

PDX

22h 57m1 stop

$235Frontier

Thu, Jan 22 - Mon, Jan 26

7:55 am - 1:54 pm

SEA

STL

3h 59mnonstop

2:50 pm - 5:25 pm

STL

SEA

4h 35mnonstop

$237Alaska Airlines

Fri, Mar 13 - Mon, Mar 16

4:57 pm - 12:18 am

SEA

STL

5h 21m1 stop

6:04 pm - 12:03 am

STL

SEA

7h 59m1 stop

$238Delta

Thu, Jan 22 - Mon, Jan 26

5:00 am - 4:03 pm

SEA

STL

9h 03m2 stops

9:57 am - 4:01 pm

STL

SEA

8h 04m1 stop

$242United Airlines

Thu, Jan 15 - Sun, Jan 18

7:35 am - 4:14 pm

SEA

STL

6h 39m1 stop

11:55 am - 5:45 pm

STL

SEA

7h 50m1 stop

$243American Airlines

Mon, Apr 6 - Tue, Apr 7

1:33 am - 9:59 am

SEA

STL

6h 26m1 stop

6:00 pm - 11:00 pm

STL

SEA

7h 00m1 stop

$244American Airlines

Wed, Mar 4 - Mon, Mar 9

6:00 am - 4:45 pm

PDX

STL

8h 45m1 stop

6:04 pm - 11:54 pm

STL

PDX

7h 50m1 stop

$249Delta

Sat, Jan 10 - Tue, Jan 13

7:51 pm - 5:11 am

PDX

STL

7h 20m1 stop

11:20 am - 9:12 pm

STL

PDX

11h 52m2 stops

$254United Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$68

Best time to beat the crowds with an average 9% drop in price.

Flight from Seattle to St. Louis

Verified travelerFlew with Alaska Airlines

SEA

STL

Jul 2025

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

Verified travelerFlew with Alaska Airlines

SEA

STL

Feb 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

Shrewsbury

Glencoe

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)

STL

$68 Find Cheap Flights from Washington to St. Louis

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

Everything you should know

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

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