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>

$82 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 23% 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

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, Apr 15 - Sat, Apr 18

12:28 pm - 10:30 am

PDX

STL

20h 02m

2 stops

8:17 pm - 10:20 am

STL

PDX

16h 03m

1 stop

$214Frontier

Mon, Apr 13 - Sat, Apr 18

11:58 am - 11:19 pm

PDX

STL

33h 21m

2 stops

8:17 pm - 10:20 am

STL

PDX

16h 03m

1 stop

$215Frontier

Sat, Apr 25 - Wed, Apr 29

5:57 pm - 11:59 pm

SEA

STL

4h 02mnonstop

7:00 am - 9:32 am

STL

SEA

4h 32mnonstop

$217Alaska Airlines

Wed, Apr 22 - Wed, Apr 29

11:47 pm - 8:24 am

PDX

STL

6h 37m

1 stop

5:20 am - 11:01 am

STL

PDX

7h 41m

1 stop

$217American Airlines

Tue, Apr 21 - Sat, Apr 25

11:40 am - 11:15 pm

SEA

STL

9h 35m

2 stops

10:35 am - 5:55 pm

STL

SEA

9h 20m

2 stops

$220Southwest

Mon, Apr 20 - Wed, Apr 29

4:20 pm - 11:19 pm

SEA

STL

28h 59m

2 stops

7:00 am - 9:32 am

STL

SEA

4h 32mnonstop

$223Multiple Airlines

Tue, Apr 14 - Wed, Apr 22

6:30 am - 5:55 pm

SEA

STL

9h 25m

2 stops

5:30 am - 6:00 pm

STL

SEA

14h 30m

2 stops

$225Southwest

Tue, Apr 14 - Wed, Apr 22

6:02 pm - 11:59 pm

SEA

STL

3h 57mnonstop

4:46 pm - 7:15 pm

STL

SEA

4h 29mnonstop

$227Alaska Airlines

Tue, Apr 14 - Wed, Apr 22

11:47 pm - 8:24 am

PDX

STL

6h 37m

1 stop

7:05 am - 12:33 pm

STL

PDX

7h 28m

1 stop

$227American Airlines

Fri, Mar 27 - Tue, Mar 31

6:00 am - 11:19 am

BLI

STL

27h 19m

1 stop

4:51 pm - 12:07 pm

STL

BLI

45h 16m

2 stops

$369Multiple Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$82

Best time to beat the crowds but there is an average 4% increase in price.

Most popular time to fly and prices are also 5% lower on average.

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

$82 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

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