STL

$72 Find Cheap Flights from Washington to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to St. Louis departing on 2/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$157
Overall average: $347
Frontier
Tue 2/24Mon 3/2
SEA - STL • 2 stops
Cheapest non-stop
$197
Typical prices: $303-$447
Alaska Airlines
Wed 4/8Wed 4/22
SEA - STL • Non-stop
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We hope you love your trip to St. Louis!
Flight Deals
Useful Info
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.

Recent round-trip flight deals from Washington to St. Louis

Tue, Feb 24 - Mon, Mar 2
Frontier Logo
6:30 pm - 3:53 pm
SEA
-
STL
19h 23m
2 stops
Frontier Logo
10:11 pm - 6:18 pm
STL
-
SEA
22h 07m
1 stop
$157Frontier
Tue, Feb 24 - Sat, Feb 28
American Airlines Logo
12:07 am - 10:03 am
SEA
-
STL
7h 56m
1 stop
American Airlines Logo
6:36 pm - 12:24 am
STL
-
SEA
7h 48m
1 stop
$159American Airlines
Tue, Feb 24 - Mon, Mar 2
American Airlines Logo
6:44 am - 5:13 pm
SEA
-
STL
8h 29m
1 stop
American Airlines Logo
6:36 pm - 12:24 am
STL
-
SEA
7h 48m
1 stop
$168American Airlines
Wed, Apr 8 - Wed, Apr 22
Delta Logo
5:30 am - 1:17 pm
SEA
-
STL
5h 47m
1 stop
Delta Logo
2:20 pm - 6:30 pm
STL
-
SEA
6h 10m
1 stop
$177Delta
Wed, Mar 25 - Mon, Mar 30
Delta Logo
1:32 pm - 12:21 am
SEA
-
STL
8h 49m
1 stop
Delta Logo
6:12 pm - 12:03 am
STL
-
SEA
7h 51m
1 stop
$185Delta
Sat, Apr 18 - Sat, Apr 25
Frontier Logo
12:27 pm - 7:12 pm
PDX
-
STL
28h 45m
1 stop
Frontier Logo
4:16 pm - 8:59 am
STL
-
PDX
18h 43m
1 stop
$191Frontier
Wed, Apr 8 - Wed, Apr 22
Alaska Airlines Logo
6:02 pm - 11:59 pm
SEA
-
STL
3h 57mnonstop
Alaska Airlines Logo
7:00 am - 9:32 am
STL
-
SEA
4h 32mnonstop
$197Alaska Airlines
Wed, Mar 4 - Tue, Mar 31
United Airlines Logo
1:18 pm - 11:21 pm
PDX
-
STL
8h 03m
1 stop
United Airlines Logo
8:30 am - 2:30 pm
STL
-
PDX
8h 00m
1 stop
$249United Airlines
Tue, Feb 24 - Fri, Feb 27
United Airlines Logo
8:30 am - 9:05 pm
PDX
-
STL
10h 35m
2 stops
United Airlines Logo
6:00 pm - 11:14 pm
STL
-
PDX
7h 14m
1 stop
$254United Airlines
Thu, Jun 11 - Wed, Jun 17
Alaska Airlines Logo
11:25 am - 5:13 pm
PDX
-
STL
3h 48mnonstop
Alaska Airlines Logo
6:20 pm - 8:30 pm
STL
-
PDX
4h 10mnonstop
$269Alaska Airlines
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$60
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Seattle to St. Louis

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

Insights shared by verified travelers who flew the route from Washington to St. Louis 
Learn how KAYAK collects reviews and tips from users.
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.

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?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Wentzville
Farmington
Eureka
Litchfield
Grafton
Shrewsbury
Glencoe

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

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

St. Louis (STL)