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Cheap flights from St Louis to Washington Ronald Reagan

Compare St Louis to Washington Ronald Reagan flight deals

Find the cheapest month or even day of the year to fly to Washington Ronald Reagan

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Flight deals from St Louis to Washington Ronald Reagan

Looking for a cheap last-minute deal or the best return flight from St Louis to Washington Ronald Reagan? Find the lowest prices on one-way and return tickets right here.
Washington D.C..$108 per passenger.Departing Mon, 13 Apr.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 13 Apr, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $108, select.
Washington D.C..$108 per passenger.Departing Fri, 1 May.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 1 May, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $108, select.
Washington D.C..$121 per passenger.Departing Sat, 9 May.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sat, 9 May, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $121, select.
Washington D.C..$135 per passenger.Departing Wed, 11 Mar.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 11 Mar, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $135, select.
Washington D.C..$136 per passenger.Departing Tue, 14 Apr.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Tue, 14 Apr, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $136, select.
Washington D.C..$149 per passenger.Departing Wed, 18 Mar.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Wed, 18 Mar, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $149, select.
Washington D.C..$186 per passenger.Departing Thu, 11 Jun.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 11 Jun, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $186, select.
Washington D.C..$187 per passenger.Departing Sat, 1 Aug.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sat, 1 Aug, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $187, select.

Find the cheapest month to fly from St Louis to Washington Ronald Reagan

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Washington Ronald Reagan flights are currently cheapest in April.
Feb
from $202
Mar
from $135
Apr
from $108
May
from $108
Jun
from $186
Jul
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Aug
from $187
Sep
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Oct
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Nov
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Dec
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Jan
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Direct flights from St Louis to Washington Ronald Reagan

St Louis to Washington Ronald Reagan: Alternative routes

Compare routes from St Louis to Washington D.C. below. You may find an airport to fly into that's cheaper, faster, or easier than Washington Ronald Reagan.

Washington Ronald Reagan

5km from central Washington D.C.
Closest
from $108
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Camp Springs Andrews AFB

17km from central Washington D.C.
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Washington Dulles

37km from central Washington D.C.
Cheapest
from $77
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Baltimore Washington International

44km from central Washington D.C.
Cheapest
from $77
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Manassas

47km from central Washington D.C.
Search flights

St Louis to Washington D.C.: Flight information

The things to know before you go.
Cheapest flight found$108
Cheapest month to flyApril
Average flight time2 hrs, 5 mins
Most popular airlineAmerican Airlines
Average flights per week82

Finding cheap flights from St Louis to Washington Ronald Reagan: Frequently asked questions

The best price we found for a return flight from St Louis to Washington Ronald Reagan is $202. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 5 minutes is the average flight time from St Louis to Washington Ronald Reagan.
American Airlines, Southwest Airlines and PSA Airlines fly direct from St Louis to Washington Ronald Reagan.
As of February 2026, there are 82 flights per week flying from St Louis to Washington Ronald Reagan.
The cheapest month to fly from St Louis to Washington Ronald Reagan is usually April.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Washington Ronald Reagan Airport on Friday, 10 April 2026.
Yes – the average flight time is 2 hours and 5 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Washington Ronald Reagan but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Washington Ronald Reagan.

Travelling from Lambert-St. Louis International Airport (STL) to Ronald Reagan National Airport (DCA): what you need to know

  • The average duration of a direct flight from Lambert-St. Louis International Airport to Ronald Reagan National Airport is 2 hours.

  • The timezone in Washington DC is UTC-4, which is one hour ahead of St Louis.

  • Take your pick of 96 weekly Lambert-St. Louis International Airport to Ronald Reagan National Airport flights. The 06:01 departure with American Airlines is the earliest flight available. Southwest Airlines operates the latest service of the day at 19:55.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for hassle-free flying. Be at the airport on time to catch your STL to DCA flight.

  • You'll likely experience longer lines in popular months such as July. Arriving up to four hours ahead of an international flight and two hours for a domestic departure will help ensure a smooth travel experience.

  • American Airlines is your gateway to exploring Washington DC (and maybe even some other great corners of United States!). Check out the direct flights from Lambert-St. Louis International Airport to Ronald Reagan National Airport offered by this popular airline.

  • The airline with the highest booking volume on this route is American Airlines.

  • American Airlines is the most punctual carrier operating STL to DCA flights. An exceptional 82.11% of its departures on this route land as scheduled.

  • We make it a cinch to book a flight with a stopover. To see your options for tickets from Lambert-St. Louis International Airport to Ronald Reagan National Airport, uncheck 'Direct flights only.' Then, pick a flight offering a stop long enough to visit your chosen city. Popular stopovers between STL and DCA include:

    • Chicago Midway International Airport

    • Detroit Metropolitan Wayne County Airport

    • Nashville International Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Ronald Reagan National Airport (DCA)

  • The lowest price we've found for a one-way Lambert-St. Louis International Airport to Ronald Reagan National Airport flight is $108. A round-trip plane ticket right now is $202. Depending on the availability and when you book, these fares can change.

  • To score cheap tickets from STL to DCA, reserve your journey seven months ahead of your departure.

  • The cheapest month for flights from Lambert-St. Louis International Airport to Ronald Reagan National Airport is June. Use the 'Whole month' tool to see the lowest prices if you have a flexible travel schedule.

  • Never miss a deal on cheap flights from STL to DCA by creating a Price Alert. You'll receive an email or notification through the app when fares go down.

  • Discover the right flight for you by using the filters. To see the 'Cheapest,' 'Fastest' or 'Best' flights from Lambert-St. Louis International Airport to Ronald Reagan National Airport, use the 'Sort by' tool. You can also filter results by airline, arrival and departure times, and journey duration.

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at Ronald Reagan National Airport (DCA)

Getting from Ronald Reagan National Airport (DCA) to central Washington DC

  • You'll find DCA at 1 Aviation Circle.

  • Ronald Reagan National Airport is roughly 8 kilometres from central Washington DC. Driving there takes about 15 minutes.

  • If you're travelling by public transport, expect a journey of about 45 minutes.

When to fly to Ronald Reagan National Airport (DCA)

  • The quietest month for a flight from Lambert-St. Louis International Airport to Ronald Reagan National Airport is May, while February is the most popular. Choose the ideal time to visit Washington DC based on whether you prefer a more fast-paced or easygoing experience.

  • The warmest month in Washington DC is July, with temperatures ranging between 19ºC (66ºF) and 33ºC (91ºF). Book your flights from Lambert-St. Louis International Airport to Ronald Reagan National Airport in this month if you enjoy this type of weather.

  • Look for cheap tickets from STL to DCA in January if you like cooler conditions. Temperatures are at their lowest around then, ranging between -6ºC (21ºF) and 10ºC (50ºF) on average.

Explore more of United States

  • You've visited Washington DC, now it's time to discover more of United States. Travel about 322 kilometres north-east to New York to tick off its popular sights. From Statue of Liberty to Central Park and Empire State Building, there's plenty to keep you busy.

  • If you're interested in discovering another corner of United States, head for Philadelphia, roughly 193 kilometres north-east of Washington DC. Liberty Bell, Independence Hall and Philadelphia Museum of Art are the start of reasons to visit.

Plan the rest of your trip from St Louis to Washington D.C.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.