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

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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

Sun, May 10 - Wed, May 20

9:46 pm - 8:23 pm

PDX

STL

20h 37m

1 stop

6:51 pm - 10:20 am

STL

PDX

17h 29m

1 stop

$221Frontier

Sat, May 23 - Sat, May 30

12:35 pm - 7:23 pm

PDX

STL

28h 48m

1 stop

6:30 pm - 10:20 am

STL

PDX

17h 50m

1 stop

$236Frontier

Mon, Jun 1 - Sat, Jun 6

11:15 am - 8:11 pm

PDX

STL

6h 56m

1 stop

5:33 pm - 7:50 pm

STL

PDX

4h 17mnonstop

$244Multiple Airlines

Thu, Jun 4 - Sat, Jun 6

11:15 am - 8:11 pm

PDX

STL

6h 56m

1 stop

5:33 pm - 7:50 pm

STL

PDX

4h 17mnonstop

$270Multiple Airlines

Wed, Jun 3 - Sat, Jun 6

10:37 am - 4:37 pm

PDX

STL

4h 00mnonstop

5:33 pm - 7:50 pm

STL

PDX

4h 17mnonstop

$277Alaska Airlines

Fri, May 29 - Sat, May 30

10:37 am - 4:37 pm

PDX

STL

4h 00mnonstop

5:33 pm - 7:50 pm

STL

PDX

4h 17mnonstop

$283Alaska Airlines

Wed, Jun 24 - Mon, Jun 29

5:30 am - 1:36 pm

SEA

STL

6h 06m

1 stop

8:00 am - 12:52 pm

STL

SEA

6h 52m

1 stop

$304Delta

Wed, Jun 10 - Tue, Jun 16

2:23 pm - 11:23 pm

GEG

STL

7h 00m

1 stop

7:55 pm - 11:59 pm

STL

GEG

6h 04m

1 stop

$347Delta

Wed, Sep 2 - Tue, Sep 8

1:38 pm - 12:30 am

GEG

STL

8h 52m

2 stops

9:00 am - 2:58 pm

STL

GEG

7h 58m

1 stop

$352United Airlines

Wed, Jun 10 - Sat, Jun 13

7:00 am - 6:17 pm

PSC

STL

9h 17m

1 stop

7:23 pm - 12:50 am

STL

PSC

7h 27m

1 stop

$446United Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$82

Best time to beat the crowds with an average 1% drop in price.

Most popular time to fly with an average 1% increase 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

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Complete your trip

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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