Cheap Flights from Saint Louis to Washington

Cheapest flights from Saint Louis to Washington

Flaut.Travel was designed and developed by a team dedicated to making the process of searching, comparing and booking airline tickets as easy and convenient as possible. Our service helps travelers to find and buy the cheapest flights from Saint Louis to Washington. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.

Cheapest one way flight

$61

Frontier Airlines

1 layover

4h 59m

10/14/2026

The cheapest one-way flight from Saint Louis to Washington departs on 10/14/2026, is operated by Frontier Airlines and costs $61

Cheapest round trip flight

—

There is no information about the cheapest roundtrip flight from Saint Louis to Washington

The fastest flight

4h 59m

Fastest flight from Saint Louis to Washington takes 4h 59m

Direct flights

Several times a week

There are direct flights on this route 6 days a week: Mo, Tu, We, Th, Fr, and Sa

Earliest flight

6:00 AM

Latest flight

7:55 PM

Direct flights count

55

Distance

1140km

Timezone difference

1h

The distance between Saint Louis and Washington is 1140km (707 miles). There are 55 direct flights from Saint Louis to Washington. The time difference between Saint Louis and Washington is 1h. Flights from Saint Louis begin at 6:00 AM. The latest flight from Saint Louis departs at 7:55 PM

Remember that on average the ideal time to book flights is 2 months before departure!

Airfare from Saint Louis to Washington by month

We carefully collect statistics on the search and pricing of airlines and, based on these data, we make an assumption about future prices. Thus, you can better understand which season is the cheapest to fly from Saint Louis to Washington

September 2026

Lowest price

on average:

$152

Avg Price

Airlines operating on route

The Saint Louis — Washington route is served by multiple airlines, including Southwest Airlines and Frontier Airlines. This is convenient for those who want the best balance of price, schedule, and travel conditions. Tickets start from $61, and depending on season and promotions, even better deals may appear. With our service, you can easily compare available options and book tickets that match your plans. The variety of carriers allows flexible choices and comfortable travel without overpaying.

Southwest Airlines

starting at $186

Frontier Airlines

starting at $61

Non-stop flights from Saint Louis to Washington

A non-stop flight is the most convenient and comfortable way to fly from Saint Louis to Washington, despite the fact that sometimes flights with transfers can cost significantly less.

Saint Louis — Baltimore

STL — BWI

09/22/2026

Departure

Direct flight

WN3812

starting at $439

Saint Louis — Baltimore

STL — BWI

09/24/2026

Departure

Direct flight

WN3812

starting at $470

Saint Louis — Baltimore

STL — BWI

09/25/2026

Departure

Direct flight

WN332

starting at $439

Saint Louis — Baltimore

STL — BWI

09/26/2026

Departure

Direct flight

WN3813

starting at $439

Saint Louis — Baltimore

STL — BWI

09/28/2026

Departure

Direct flight

WN3814

starting at $441

Saint Louis — Baltimore

STL — BWI

09/28/2026

Departure

Direct flight

WN3814

starting at $439

Saint Louis — Baltimore

STL — BWI

10/14/2026

Departure

Direct flight

WN1100

starting at $186

Schedule of direct flights from Saint Louis to Washington

There are most likely no direct flights on the Saint Louis — Washington route

Saint Louis airports overview

Lambert-St. Louis International Airport

•

STL

20km

Serving St. Louis, Missouri, and the surrounding metro area, it handles domestic and limited international flights with major carriers, a compact terminal, and convenient access to downtown.

Spirit of St. Louis Airport

•

SUS

20km

Serving the St. Louis metro in western St. Louis County, Missouri, primarily a reliever and general aviation field with FBO services, hangars and private-charter operations.

•

Washington airports overview

Ronald Reagan National Airport

•

DCA

5km

Convenient for downtown Washington, D.C. and the National Mall, offering primarily domestic and short-haul flights with direct Metro access and quick transfers across the Potomac.

Washington Dulles International Airport

•

IAD

37km

•

Frequently asked questions (FAQ)

Answers to questions about the route that travelers are most interested in.

What is the cheapest price for flights from Saint Louis to Washington?

The cheapest flight ticket from Saint Louis to Washington according to data for the last 48 hours costs $61

When is the best time to buy air tickets on the route Saint Louis — Washington?

Often the best time to buy tickets from Saint Louis to Washington is 2 months before departure.

When is the cheapest time of year to fly from Saint Louis to Washington?

Based on statistics over the past years, the lowest prices for flights from Saint Louis to Washington can be found flying in these months: September.

How long does it take to fly from Saint Louis to Washington?

The fastest flights from Saint Louis to Washington start from 4 hours 59 minutes in the air.

Which airline can fly direct from Saint Louis to Washington?

The following airlines operate direct flights on the route Saint Louis — Washington: Southwest Airlines

Special offers and sales on air tickets from Saint Louis to Washington

We keep tight track on airlines' pre-holidays sales and other special offers occurences all the time to let you save maximum amount of funds while traveling to your family or just going out on vacation.

We couldn't find any special offers for flights from Saint Louis to Washington

Alternative routes

Nashville ➜ Washington•Burlington ➜ Washington•Chicago ➜ Washington•Cedar Rapids ➜ Washington•Champaign ➜ Washington•Evansville ➜ Washington•Indianapolis ➜ Washington•Memphis ➜ Washington•Saint Louis ➜ Baltimore•Saint Louis ➜ Charlottesville•Saint Louis ➜ Hagerstown•Saint Louis ➜ Lancaster•Saint Louis ➜ Philadelphia•Saint Louis ➜ Richmond

•••••••••••••••••••

Cheapest one way flight

$61

Frontier Airlines

1 layover

4h 59m

10/14/2026

The cheapest one-way flight from Saint Louis to Washington departs on 10/14/2026, is operated by Frontier Airlines and costs $61

Cheapest round trip flight

—

There is no information about the cheapest roundtrip flight from Saint Louis to Washington

The fastest flight