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>

$84 CHEAP FLIGHTS from Washington to St. Louis

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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, Sep 3 - Fri, Sep 5

7:00 am - 3:44 pmSEA-STL

6h 44m1 stop

5:49 pm - 10:59 pmSTL-SEA

7h 10m1 stop

$174United Airlines

Find Deal

Tue, Aug 26 - Tue, Sep 2

11:55 pm - 10:37 amSEA-STL

8h 42m1 stop

7:35 am - 2:43 pmSTL-SEA

9h 08m1 stop

$177Delta

Find Deal

Thu, Sep 25 - Mon, Oct 6

3:00 pm - 11:48 pmSEA-STL

6h 48m1 stop

10:10 am - 4:53 pmSTL-SEA

8h 43m1 stop

$189American Airlines

Find Deal

Wed, Nov 5 - Mon, Nov 10

12:59 am - 10:37 amSEA-STL

7h 38m1 stop

4:48 pm - 11:18 pmSTL-SEA

8h 30m1 stop

$213American Airlines

Find Deal

Sat, Sep 6 - Sat, Sep 13

8:36 am - 2:39 pmSEA-STL

4h 03mnonstop

3:35 pm - 5:54 pmSTL-SEA

4h 19mnonstop

$214Hawaiian Airlines

Find Deal

Tue, Aug 26 - Tue, Sep 2

11:34 am - 5:34 pmSEA-STL

4h 00mnonstop

6:00 am - 8:30 amSTL-SEA

4h 30mnonstop

$217Hawaiian Airlines

Find Deal

Thu, Aug 21 - Sat, Aug 23

11:52 am - 9:11 amGEG-STL

19h 19m1 stop

7:54 pm - 11:07 amSTL-GEG

17h 13m1 stop

$235Frontier

Find Deal

Tue, Sep 30 - Tue, Sep 30

5:35 am - 2:25 pmSEA-STL

6h 50m1 stop

5:25 pm - 10:50 pmSTL-SEA

7h 25m1 stop

$236Southwest

Find Deal

Wed, Aug 27 - Wed, Sep 3

6:45 am - 5:40 pmSEA-STL

8h 55m2 stops

4:35 pm - 11:35 pmSTL-SEA

9h 00m1 stop

$242Southwest

Find Deal

Sat, Aug 23 - Tue, Aug 26

6:27 am - 9:11 amPDX-STL

24h 44m1 stop

7:54 pm - 10:39 pmSTL-PDX

28h 45m1 stop

$245Frontier

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	$84

Best time to beat the crowds but there is an average 1% increase in price.

Most popular time to fly and prices are also 1% 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.

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

$84 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.

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