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>

$106 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

Wed, Sep 2 - Sat, Sep 5

11:30 pm - 10:30 am

PDX

STL

9h 00m

1 stop

8:30 am - 10:40 am

STL

PDX

4h 10mnonstop

$222Southwest

Tue, Aug 4 - Sat, Aug 15

11:15 pm - 8:23 am

PDX

STL

7h 08m

1 stop

8:00 am - 1:52 pm

STL

PDX

7h 52m

1 stop

$231American Airlines

Sun, Aug 16 - Wed, Aug 26

9:14 pm - 6:15 pm

GEG

STL

19h 01m

1 stop

6:58 pm - 9:22 am

STL

GEG

16h 24m

1 stop

$242Multiple Airlines

Thu, Aug 20 - Wed, Aug 26

10:12 am - 7:36 pm

GEG

STL

7h 24m

1 stop

6:58 pm - 9:22 am

STL

GEG

16h 24m

1 stop

$245Multiple Airlines

Thu, Aug 13 - Mon, Aug 17

2:27 pm - 10:59 pm

PDX

STL

6h 32m

1 stop

5:30 pm - 10:52 pm

STL

PDX

7h 22m

1 stop

$251United Airlines

Fri, Aug 28 - Mon, Aug 31

10:50 am - 8:46 pm

PDX

STL

7h 56m

1 stop

5:10 am - 9:32 am

STL

PDX

6h 22m

1 stop

$271United Airlines

Wed, Jul 29 - Tue, Aug 4

5:21 pm - 7:23 pm

PDX

STL

24h 02m

1 stop

8:08 pm - 4:36 pm

STL

PDX

22h 28m

1 stop

$275Frontier

Thu, Aug 20 - Sun, Aug 23

5:08 pm - 12:41 am

PDX

STL

5h 33m

1 stop

5:34 pm - 11:20 pm

STL

PDX

7h 46m

1 stop

$285Delta

Fri, Jul 10 - Wed, Jul 29

7:06 pm - 8:57 am

SEA

STL

11h 51m

2 stops

7:03 pm - 10:39 am

STL

SEA

17h 36m

1 stop

$375Frontier

Mon, Jun 29 - Tue, Jun 30

5:21 pm - 12:43 am

PSC

STL

5h 22m

1 stop

7:55 pm - 11:58 pm

STL

PSC

6h 03m

1 stop

$437Delta

Useful Info

Low season	January
High season	July
Cheapest flight	$106

Best time to beat the crowds with an average 2% drop in price.

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

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

St. Louis (STL)

STL

$106 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

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

FAQs for booking flights from Washington to St. Louis

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

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

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