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Flight tickets from St Louis to Washington D.C.

Compare St Louis to Washington D.C. flight deals

Find the cheapest month or even day of the year to fly to Washington D.C.

Book the best Washington D.C. fare with no extra fees

Flight deals from St Louis to Washington D.C.

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Washington D.C.? If you want to travel next month, return fares start from ₹ 13,007. Find the lowest prices on one-way and return tickets right here.
Washington D.C..₹ 5,770 per passenger.Departing Wed, 29 Apr.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 29 Apr, arriving in Baltimore Washington International.Price includes taxes and charges.From ₹ 5,770, select.
Washington D.C..₹ 6,293 per passenger.Departing Mon, 4 May.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 4 May, arriving in Washington Dulles.Price includes taxes and charges.From ₹ 6,293, select.
Washington D.C..₹ 8,883 per passenger.Departing Sun, 7 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 7 Jun, arriving in Washington Ronald Reagan.Price includes taxes and charges.From ₹ 8,883, select.
Washington D.C..₹ 11,032 per passenger.Departing Tue, 19 May.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Tue, 19 May, arriving in Washington Ronald Reagan.Price includes taxes and charges.From ₹ 11,032, select.
Washington D.C..₹ 11,044 per passenger.Departing Wed, 17 Jun.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Wed, 17 Jun, arriving in Washington Ronald Reagan.Price includes taxes and charges.From ₹ 11,044, select.
Washington D.C..₹ 12,336 per passenger.Departing Thu, 30 Apr.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 30 Apr, arriving in Washington Ronald Reagan.Price includes taxes and charges.From ₹ 12,336, select.
Washington D.C..₹ 14,665 per passenger.Departing Mon, 6 Jul.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Mon, 6 Jul, arriving in Washington Ronald Reagan.Price includes taxes and charges.From ₹ 14,665, select.
Washington D.C..₹ 14,683 per passenger.Departing Wed, 10 Feb.One-way flight with American Airlines.Outbound direct flight with American Airlines departs from St Louis on Wed, 10 Feb, arriving in Washington Ronald Reagan.Price includes taxes and charges.From ₹ 14,683, select.
Washington D.C..₹ 15,597 per passenger.Departing Mon, 7 Sep.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Mon, 7 Sep, arriving in Washington Dulles.Price includes taxes and charges.From ₹ 15,597, select.
Washington D.C..₹ 15,863 per passenger.Departing Thu, 15 Oct.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Thu, 15 Oct, arriving in Baltimore Washington International.Price includes taxes and charges.From ₹ 15,863, select.
Washington D.C..₹ 20,668 per passenger.Departing Thu, 15 Oct.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 15 Oct, arriving in Baltimore Washington International.Price includes taxes and charges.From ₹ 20,668, select.
Washington D.C..₹ 22,238 per passenger.Departing Mon, 7 Sep.One-way flight with United.Outbound direct flight with United departs from St Louis on Mon, 7 Sep, arriving in Washington Dulles.Price includes taxes and charges.From ₹ 22,238, select.

Find the cheapest month to fly from St Louis to Washington D.C.

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Washington D.C. flights are currently cheapest in April.
Apr
from ₹ 5,770
May
from ₹ 6,293
Jun
from ₹ 8,883
Jul
from ₹ 14,665
Aug
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Sep
from ₹ 15,597
Oct
from ₹ 15,863
Nov
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Dec
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Jan
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Feb
from ₹ 14,683
Mar
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Direct flights from St Louis to Washington D.C.

Alternative St Louis to Washington D.C. routes

Looking for the cheapest, fastest or easiest route from St Louis to Washington D.C.? You could fly into the following airports instead.

Washington Ronald Reagan

5km from central Washington D.C.
Closest
from ₹ 8,883
Search flights

Camp Springs Andrews AFB

17km from central Washington D.C.
Search flights

Washington Dulles

37km from central Washington D.C.
from ₹ 6,293
Search flights

Baltimore Washington International

44km from central Washington D.C.
Cheapest
from ₹ 5,770
Search flights

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₹ 5,770
Cheapest month to flyApril
Average flight time2 hrs, 7 mins
Most popular airlineSouthwest Airlines
Average flights per week156

Finding cheap flights from St Louis to Washington D.C.: Frequently asked questions

There are 5 airports in Washington D.C.: Washington Ronald Reagan, Camp Springs Andrews AFB, Washington Dulles, Baltimore Washington International, and Manassas.
The best price we found for a return flight from St Louis to Washington D.C. is ₹ 13,007. 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 7 minutes is the average flight time from St Louis to Washington D.C..
Southwest Airlines, American Airlines and PSA Airlines fly direct from St Louis to Washington D.C..
As of April 2026, there are 156 flights per week flying from St Louis to Washington D.C..
The cheapest month to fly from St Louis to Washington D.C. is usually May.
If you're flying from St Louis Airport, the cheapest airport near Washington D.C. is Baltimore Washington International – which is 43.6 km away from the centre of Washington D.C.. We've found flights into this airport from ₹ 13,007.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Washington D.C. on Monday, 4 May 2026.
Yes – the average flight time is 2 hours and 7 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 D.C. 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.
In April, the average temperature is usually around 12°C. July is typically the warmest month in Washington D.C., when it usually averages around 31°C. You can expect the least rain in February. The coldest month is January, with temperatures averaging -4°C. The rainiest month is September.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Washington D.C..

Flying from Lambert-St. Louis International Airport (STL) to Washington DC: what you need to know

  • Approximately 2 hours 20 minutes is how long you can expect to be travelling on a direct flight from Lambert-St. Louis International Airport to Washington DC.

  • Lambert-St. Louis International Airport is located in St Louis. Following the UTC-4 timezone, Washington DC is one hour ahead of St Louis.

  • Lambert-St. Louis International Airport (STL) to Ronald Reagan National Airport (DCA) is the most traveled route, with 34 flights a week to choose from. If you have things to do before heading off, the last flight from STL to DCA is with Southwest Airlines at 20:50. Go for the first departure operated by American Airlines at 05:12 if you want to fly out earlier.

  • For a stress-free journey, turn up at the airport two hours ahead of international flights and one hour before domestic departures. That way, you won't have to rush to board your STL to Washington DC flight.

  • Be prepared for bigger queues in popular months like July. Arriving up to four hours ahead of international flights and two hours for a domestic departure is a wise move.

  • You can travel nonstop from STL to Washington DC. Pick from these arrival points when searching for a Lambert-St. Louis International Airport to Washington DC ticket:

    • Ronald Reagan National Airport (DCA)

    • Washington Dulles International Airport (IAD)

    • Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • You'll find a variety of carriers that operate direct flights from Lambert-St. Louis International Airport to Washington DC, including:

  • STL is about 16 kilometres from central St Louis. If you're catching a cab, driving or ride-sharing from the centre, it'll take you 20 minutes or so to get there, depending on the traffic. If you're planning to take public transport, expect the travel time to be around 35 minutes.

  • In search of a hotel near STL? If you're catching an early flight from Lambert-St. Louis International Airport to Washington DC, these stays put the terminal practically at your doorstep:

  • Of all flights leaving Lambert-St. Louis International Airport, 78.04% land on schedule at their destination.

  • You'll find STL at 10701 Lambert International Blvd..

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Washington DC

  • The lowest price we've seen for a one-way Lambert-St. Louis International Airport to Washington DC flight is ₹ 5,770. The cheapest price for a return flight is ₹ 13,007. Keep in mind fares can change due to demand at the time of booking.

  • Get cheap flights from STL to Washington DC by booking two months ahead. Based on our research, that's the sweet spot for finding the biggest deals.

  • Plan your trip for June. That's the best month for scoring a bargain on Lambert-St. Louis International Airport to Washington DC tickets. If you have flexibility with your dates, use the 'Whole month' tool to find the lowest price across each month.

  • Save time looking for cheap flights from STL to Washington DC by creating a Price Alert. You'll get an email or notification on the app when a new low fare is offered.

  • Select your ideal arrival and departure times, airlines and number of stops with our filters. Then, sort the results for your flight from Lambert-St. Louis International Airport to Washington DC by 'Best,' 'Cheapest' or 'Fastest.'

Airports in Washington DC

Ronald Reagan National Airport (DCA)

  • The distance from Ronald Reagan National Airport (DCA) to central Washington DC is roughly 8 kilometres. It takes around 15 minutes to reach the centre driving.

  • Getting to the centre on public transport typically takes 45 minutes.

  • The last thing you need is a lengthy journey to your hotel if you're getting in late on a flight from Lambert-St. Louis International Airport to Washington DC. Check in to one of these accommodation options near DCA instead:

  • Pick up a Ronald Reagan National Airport rental car and explore Washington DC and beyond with your own wheels. Thrifty, Sixt and Dollar are leading providers you can book with here.

  • Booking your ride from Ronald Reagan National Airport around four weeks ahead of your flight from STL to Washington DC can help you lock in the lowest rate.

  • DCA is located at 1 Aviation Circle.

Washington Dulles International Airport (IAD)

  • After your flight from Lambert-St. Louis International Airport to Washington DC has landed, you can make your way to the city centre in about 50 minutes by car. Central Washington DC is roughly 56 kilometres from Washington Dulles International Airport (IAD).

  • The trip will take roughly 1 hour 10 minutes on public transport.

  • You'll find some great places to park your luggage (and yourself) near IAD. Settle in and get cosy after your STL to Washington DC flight at one of these perfectly located options:

  • Forget about public transport timetables or long cab lines. Pick up a Washington Dulles International Airport rental car and let the journey unfold your way. Check out the availability and rates from Dollar, Thrifty and Sixt.

  • Snap up the best price by booking your ride from IAD one week in advance. You can also expect to have a greater selection of vehicles.

  • You can find Washington Dulles International Airport at 1 Saarinen Circle.

Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • Step off your flight from Lambert-St. Louis International Airport to Washington DC and head straight for your hotel or jump right into sightseeing. The centre of Washington DC is around 48 kilometres from Baltimore/Wash International Thurgood Marshall Airport (BWI) and typically takes 50 minutes to reach by car.

  • If you use public transport, the journey time is around 1 hour 30 minutes.

  • If you don't want to make your way into the centre, head for a hotel near BWI. Check in to one of these stays after your STL to Washington DC flight:

  • Start your trip without stressing over how to reach your destination with a Baltimore/Wash International Thurgood Marshall Airport rental car. You can book with trusted companies here like Dollar, Thrifty and Budget.

  • About two weeks ahead of your flight from Lambert-St. Louis International Airport to Washington DC is a good time to secure your ride from BWI. You're more likely to land a better deal or catch some early booking discounts.

Best time to go to Washington DC

  • Before locking in your flights from Lambert-St. Louis International Airport to Washington DC, consider which time of year is best for you. High season in Washington DC offers a lively atmosphere and plenty of things to do, while the off-season means you'll get better hotel deals and fewer crowds.

  • When booking your Lambert-St. Louis International Airport to Washington DC flight ticket, think about the kind of weather forecast you're hoping for. July is the warmest month in Washington DC, with temperatures ranging from 19ºC to 33ºC.

  • Look for cheap tickets from STL to Washington DC in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -6ºC and 10ºC on average.

More about Washington DC

Explore more of United States

  • New York is just one of the many cities in United States waiting to be explored once you've seen Washington DC. Around 322 kilometres away to the north-east, its top attractions include Statue of Liberty, Central Park and Empire State Building.

  • Philadelphia is another well-known destination in United States and is around 193 kilometres north-east of Washington DC. No journey is complete without dropping by Liberty Bell, Independence Hall and Philadelphia Museum of Art.

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.