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Find cheap one-way flights from St. Louis to Washington D.C. starting at US$69.

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

  • One way
  • Round-trip
      • STL06:20
        2h 1m
        Direct
        DCA09:21
        Sat, Apr 27|St. Louis - Washington D.C.|American Airlines
        US$69US$112
        38% OFF
        38% OFF
        US$112US$69
      • STL06:16
        1h 59m
        Direct
        DCA09:15
        Sat, May 11|St. Louis - Washington D.C.|American Airlines
        US$78US$112
        31% OFF
        31% OFF
        US$112US$78
      • STL06:20
        2h 1m
        Direct
        DCA09:21
        Tue, Apr 30|St. Louis - Washington D.C.|American Airlines
        US$78US$112
        31% OFF
        31% OFF
        US$112US$78
      • STL06:20
        2h 1m
        Direct
        DCA09:21
        Sat, May 4|St. Louis - Washington D.C.|American Airlines
        US$80
        US$80
      • STL06:16
        1h 59m
        Direct
        DCA09:15
        Tue, May 14|St. Louis - Washington D.C.|American Airlines
        US$81
        US$81
      • STL17:25
        4h 21m
        1 stop
        DCA22:46
        Sat, May 4|St. Louis - Washington D.C.|Delta Air Lines
        US$82
        US$82
      • STL06:09
        2h 2m
        Direct
        DCA09:11
        Wed, Jul 3|St. Louis - Washington D.C.|American Airlines
        US$82
        US$82
      • STL13:01
        4h 13m
        1 stop
        DCA18:14
        Sat, Apr 27|St. Louis - Washington D.C.|Delta Air Lines
        US$83
        US$83
      • STL17:29
        4h 23m
        1 stop
        IAD22:52
        Sat, May 11|St. Louis - Washington D.C.|Delta Air Lines
        US$84
        US$84
      • STL17:35
        17h 25m
        1 stop
        DCA12:00
        Fri, May 3|St. Louis - Washington D.C.|Frontier Airlines
        US$85
        US$85
      • STL13:00
        3h 5m
        Direct
        WAS14:00
        Wed, May 1|St. Louis - Washington D.C.|American Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to book flights from St. Louis to Washington D.C.?

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Cheapest airlines flights from St. Louis to Washington D.C.

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

American Airlines
From US$69
Delta Air Lines
From US$82
Frontier Airlines
From US$99
United Airlines
From US$109
Southwest Airlines
From US$119
Sun Country Airlines
From US$129
Alaska Airlines
From US$428
ANA airlines

Find more flights and airlines

Find cheap flights from St. Louis to Washington D.C. by different airports

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from St. Louis to Washington D.C..

  • Cheapest
    American Airlines
    STL
    06:20
    2h 1m
    Direct
    DCA
    09:21
    St. Louis Lambert International Airport - Ronald Reagan Washington National Airport
    Sat, Apr 27American Airlines
    US$69
  • Delta Air Lines
    STL
    14:27
    4h 16m
    1 transfer
    IAD
    19:43
    St. Louis Lambert International Airport - Dulles International Airport
    Sat, Apr 27Delta Air Lines
    US$83
  • Delta Air Lines
    STL
    14:27
    4h 16m
    1 transfer
    IAD
    19:43
    St. Louis Lambert International Airport - Dulles International Airport
    Sat, Apr 27Delta Air Lines
    US$83
    Find More Flights

Frequently Asked Questions

  • When are flight tickets from St. Louis (STL) to Washington D.C. (WAS) the cheapest?

    Airlines adjust prices for flights from St. Louis to Washington D.C. based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from St. Louis (STL) to Washington D.C. (WAS) cost?

    According to Trip.com's data, the lowest price is around $348.

  • How long does it take to fly from St. Louis (STL) to Washington D.C. (WAS) and what is the distance?

    It takes around 2 hours 33 minutes to fly from St. Louis (STL) to Washington D.C. (WAS).

  • What are the most popular airlines that fly from St. Louis (STL) to Washington D.C. (WAS)?

    Airlines with flights from St. Louis (STL) to Washington D.C. (WAS): American Airlines, Brussels Airlines, Copa Airlines, United Airlines, Southwest Airlines, Lufthansa, Scandinavian Airlines and Avianca.

How to find a cheap flight from St. Louis to Washington D.C.

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Washington D.C.. Book your flights at the right time and save more.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

St. Louis to Washington D.C. Flight Information

Cheapest nonstop flight price

$69

Cheapest round-trip ticket price

$120

Off-season for travel

December

Peak season for travel

October

Flight distance

1,139.76km

Average flight time

2 hours 33 minutes

Popular airline

American Airlines

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