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Flights from St. Louis to Washington D.C.

Search cheap flights from St. Louis to Washington D.C. in the next 3 months. Based on Trip.com's latest 7-day data, one-way fares start at US$122, and round-trip tickets start at US$215.

      • STL 06:00
        2h 14m
        Nonstop
        DCA 09:14
        St. Louis - Washington D.C. | Sun, Aug 16 | American Airlines
        IAD 07:48
        10h 49m
        1 stop
        STL 17:37
        Washington D.C. - St. Louis | Thu, Aug 20 | Frontier Airlines
        US$215 US$326
        34% off
        34% off
        US$326 US$215
      • STL 20:08
        15h 43m
        1 stop
        DCA 12:51
        St. Louis - Washington D.C. | Sun, Aug 16 | Frontier Airlines
        IAD 07:48
        10h 49m
        1 stop
        STL 17:37
        Washington D.C. - St. Louis | Thu, Aug 20 | Frontier Airlines
        US$220 US$326
        33% off
        33% off
        US$326 US$220
      • STL 15:39
        5h 6m
        1 stop
        DCA 21:45
        St. Louis - Washington D.C. | Fri, Aug 21 | Delta Air Lines
        DCA 06:00
        4h 54m
        1 stop
        STL 09:54
        Washington D.C. - St. Louis | Mon, Aug 24 | Delta Air Lines
        US$229 US$326
        30% off
        30% off
        US$326 US$229
      • STL 13:04
        5h 30m
        1 stop
        DCA 19:34
        St. Louis - Washington D.C. | Wed, Aug 19 | Delta Air Lines
        IAD 06:00
        4h 20m
        1 stop
        STL 09:20
        Washington D.C. - St. Louis | Wed, Aug 26 | Delta Air Lines
        US$239
        27% off
        US$326 US$239
      • STL 16:57
        4h 58m
        1 stop
        IAD 22:55
        St. Louis - Washington D.C. | Tue, Aug 11 | Frontier Airlines
        IAD 09:30
        9h 45m
        1 stop
        STL 18:15
        Washington D.C. - St. Louis | Wed, Aug 12 | Frontier Airlines
        US$241
        26% off
        US$326 US$241
      • STL 13:00
        17h 25m
        1 stop
        WAS 14:00
        St. Louis - Washington D.C. | Sun, Jul 12 | Normal Airline
        WAS 15:00
        6h
        Nonstop
        STL 16:00
        Washington D.C. - St. Louis | Tue, Jul 14 | Normal Airline
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      • STL 06:00
        4h 27m
        1 stop
        DCA 11:27
        St. Louis - Washington D.C. | Mon, Aug 31 | Delta Air Lines
        US$122 US$167
        27% off
        27% off
        US$167 US$122
      • STL 07:08
        6h 48m
        1 stop
        DCA 14:56
        St. Louis - Washington D.C. | Tue, Jul 21 | Delta Air Lines
        US$123 US$167
        26% off
        26% off
        US$167 US$123
      • STL 16:57
        4h 58m
        1 stop
        IAD 22:55
        St. Louis - Washington D.C. | Tue, Aug 11 | Frontier Airlines
        US$123 US$167
        26% off
        26% off
        US$167 US$123
      • STL 06:00
        4h 37m
        1 stop
        IAD 11:37
        St. Louis - Washington D.C. | Tue, Aug 4 | Delta Air Lines
        US$123
        26% off
        US$167 US$123
      • STL 13:00
        17h 25m
        1 stop
        WAS 14:00
        St. Louis - Washington D.C. | Sun, Jul 12 | Normal Airline
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Displayed flight fares from St. Louis to Washington D.C. are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

St. Louis to Washington D.C. Flight Details

The distance between St. Louis and Washington D.C. is about 1,139.76 km. The average flying time from St. Louis to Washington D.C. is around 2 hours 6 minutes. Based on Trip.com's latest data, travel demand is highest in July. The off-season for travel is November.

Cheapest one-way flight priceUS$122
Cheapest return ticket priceUS$215
Cheapest monthNovember
Peak season for travelJuly
Flight distance1,139.76 km
Average flight time2 hours 6 minutes
Flight statistics for the St. Louis–Washington D.C. route are based on aggregated booking data from Trip.com over the past 12 months.

Trip.com Price Insights on Flights from St. Louis to Washington D.C.

Which month has the cheapest one-way flights from St. Louis to Washington D.C.?

Average monthly one-way flight prices from St. Louis to Washington D.C., based on bookings made by Trip.com users over the past 12 months.

Based on Trip.com’s data, the cheapest month for flights from St. Louis to Washington D.C. is December, with an average price of US$112; while the month with the highest flight price is usually November, with an average price of up to US$364.

US$364
US$238
US$112
0
    Cheapest
  • US$121
    Jan
  • US$340
    Feb
  • US$206
    Mar
  • US$189
    Apr
  • US$206
    May
  • US$195
    Jun
  • US$232
    Jul
  • US$242
    Aug
  • US$303
    Sep
  • US$123
    Oct
  • US$364
    Nov
  • US$112
    Dec

Frequently Asked Questions

  • What are the cheapest flights from St. Louis to Washington D.C. (STL-WAS)?

    Based on Trip.com data, Delta Air Lines offers one-way fares as low as US$122 on Cheapest nonstop routes (e.g. STL to DCA on Mon, Aug 31), while American Airlines offers Cheapest nonstop round-trips from US$215 departing on Sun, Aug 16 and returning on Thu, Aug 20.
  • At the moment, several airlines serve connecting flights from St. Louis to Washington D.C., including: Frontier Airlines Selected airlines are based on historical data collected from flight bookings made by users on Trip.com within the last 90 days.
  • It takes about 2 hours 6 minutes to fly from St. Louis to Washington D.C..
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from St. Louis to Washington D.C. is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from St. Louis to Washington D.C., you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Aug 31, with one-way flights priced at just US$122.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Delta Air Lines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Washington D.C. travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from St. Louis to Washington D.C. is November, when demand for travel is lower.
  • You can land at any one of the following hubs in Washington D.C., with St. Louis Lambert International Airport to Ronald Reagan Washington National Airport (STL-DCA) is by far the most common option on this route: Ronald Reagan Washington National Airport (DCA) Dulles International Airport (IAD).
  • The time difference between Washington D.C. and St. Louis is 1h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

Trip.com Airline Insights on Flights from St. Louis to Washington D.C.

Which airline offers the cheapest direct flights from St. Louis to Washington D.C.?

Data is based on the average price of all nonstop flights from St. Louis to Washington D.C. on Trip.com over the past 12 months.

Based on Trip.com’s data from the past 12 months, Frontier Airlines provides the lowest-priced direct flights from St. Louis to Washington D.C., with fares starting at US$115.

US$52
US$115
US$178
US$241
US$304
Frontier Airlines
US$115
Frontier Airlines
United Airlines
US$277
United Airlines
American Airlines
US$299
American Airlines
Delta Air Lines
US$304
Delta Air Lines

Which airline operates the most flights from St. Louis to Washington D.C.?

Total flights from St. Louis to Washington D.C. across all airlines. (Based on Trip.com data from the past month)

Based on Trip.com’s data from the past month, American Airlines operates the most frequent flights from St. Louis to Washington D.C., with 19 flights per week.

3
8
14
19
American Airlines
19
American Airlines
United Airlines
15
United Airlines
Lufthansa
15
Lufthansa
Brussels Airlines
8
Brussels Airlines
avianca
8
avianca

How many flights fly from St. Louis to Washington D.C. daily?

The data is based on the flight numbers for each day of the week from St. Louis to Washington D.C. within the Trip.com database over the past month.

Based on the past month's historical data from Trip.com, the number of flights from St. Louis to Washington D.C. is the highest on Friday/Sunday and the lowest on Monday.

61
58
55
52
Highest
55
Mon
57
Tue
56
Wed
57
Thu
61
Fri
56
Sat
61
Sun

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Note: Prices shown on this page are the estimated lowest prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before you pay. Charges for checked baggage, onboard meals, Wi‑Fi, and other optional services are also included where applicable in the flight cards.

Real-time pricing updates

Prices, availability, and travel details on this page have been updated within the last 24 hours, and for many routes are refreshed in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.