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St. Louis Lambert International Airport to Dulles International Airport flight

Explore the cheapest one-way and round-trip flights from St. Louis Lambert International Airport to Dulles International Airport over the next 90 days, with one-way fares from AU$ 94 and round-trip from AU$ 169. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        STL 12:44
        2h 6m
        Direct
        IAD 15:50
        St. Louis - Washington D.C. | Mon, Sep 28 | United Airlines
        IAD 08:25
        2h 14m
        Direct
        STL 09:39
        Washington D.C. - St. Louis | Wed, Sep 30 | United Airlines
        AU$ 536 AU$ 754
        28% off
        28% off
        AU$ 754 AU$ 536
      • STL 13:00
        2h 6m
        Direct
        IAD 16:06
        St. Louis - Washington D.C. | Sat, Sep 26 | United Airlines
        IAD 08:25
        2h 14m
        Direct
        STL 09:39
        Washington D.C. - St. Louis | Wed, Sep 30 | United Airlines
        AU$ 610 AU$ 754
        19% off
        19% off
        AU$ 754 AU$ 610
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Mon, Oct 19 | Frontier Airlines
        IAD 07:50
        10h 50m
        1 stop
        STL 17:40
        Washington D.C. - St. Louis | Mon, Oct 26 | Frontier Airlines
        AU$ 169 AU$ 754
        78% off
        78% off
        AU$ 754 AU$ 169
      • STL 14:29
        8h 41m
        1 stop
        IAD 00:10
        St. Louis - Washington D.C. | Sat, Oct 10 | Frontier Airlines
        IAD 07:50
        6h 20m
        1 stop
        STL 13:10
        Washington D.C. - St. Louis | Mon, Oct 12 | Frontier Airlines
        AU$ 190
        75% off
        AU$ 754 AU$ 190
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Mon, Oct 26 | Frontier Airlines
        IAD 07:50
        10h 50m
        1 stop
        STL 17:40
        Washington D.C. - St. Louis | Sat, Oct 31 | Frontier Airlines
        AU$ 196
        74% off
        AU$ 754 AU$ 196
      • STL 18:39
        14h 38m
        1 stop
        IAD 10:17
        St. Louis - Washington D.C. | Tue, Sep 29 | Frontier Airlines
        IAD 07:50
        6h 20m
        1 stop
        STL 13:10
        Washington D.C. - St. Louis | Mon, Oct 5 | Frontier Airlines
        AU$ 226
        70% off
        AU$ 754 AU$ 226
      • STL 18:39
        14h 38m
        1 stop
        IAD 10:17
        St. Louis - Washington D.C. | Tue, Oct 6 | Frontier Airlines
        IAD 07:50
        6h 20m
        1 stop
        STL 13:10
        Washington D.C. - St. Louis | Sat, Oct 10 | Frontier Airlines
        AU$ 240
        68% off
        AU$ 754 AU$ 240
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Wed, Oct 14 | Frontier Airlines
        IAD 07:50
        10h 50m
        1 stop
        STL 17:40
        Washington D.C. - St. Louis | Sat, Oct 17 | Frontier Airlines
        AU$ 258
        66% off
        AU$ 754 AU$ 258
      • STL 14:29
        8h 41m
        1 stop
        IAD 00:10
        St. Louis - Washington D.C. | Mon, Oct 12 | Frontier Airlines
        IAD 07:50
        10h 50m
        1 stop
        STL 17:40
        Washington D.C. - St. Louis | Sat, Oct 17 | Frontier Airlines
        AU$ 261
        65% off
        AU$ 754 AU$ 261
      • STL 14:29
        8h 41m
        1 stop
        IAD 00:10
        St. Louis - Washington D.C. | Mon, Oct 5 | Frontier Airlines
        DCA 13:06
        7h 11m
        1 stop
        STL 19:17
        Washington D.C. - St. Louis | Thu, Oct 8 | Frontier Airlines
        AU$ 263
        65% off
        AU$ 754 AU$ 263
      • STL 16:26
        16h 55m
        1 stop
        IAD 10:21
        St. Louis - Washington D.C. | Thu, Nov 5 | Frontier Airlines
        IAD 11:16
        13h
        1 stop
        STL 23:16
        Washington D.C. - St. Louis | Thu, Nov 12 | Frontier Airlines
        AU$ 270
        64% off
        AU$ 754 AU$ 270
      • STL 16:30
        16h 47m
        1 stop
        IAD 10:17
        St. Louis - Washington D.C. | Tue, Oct 13 | Frontier Airlines
        IAD 11:12
        13h 1m
        1 stop
        STL 23:13
        Washington D.C. - St. Louis | Thu, Oct 15 | Frontier Airlines
        AU$ 272
        64% off
        AU$ 754 AU$ 272
      • STL 12:17
        17h 3m
        1 stop
        IAD 06:20
        St. Louis - Washington D.C. | Sun, Sep 27 | Frontier Airlines
        IAD 06:00
        30h 32m
        1 stop
        STL 11:32
        Washington D.C. - St. Louis | Sun, Oct 4 | Frontier Airlines
        AU$ 288
        62% off
        AU$ 754 AU$ 288
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Sat, Oct 31 | Frontier Airlines
        DCA 18:00
        26h 14m
        1 stop
        STL 19:14
        Washington D.C. - St. Louis | Tue, Nov 3 | Frontier Airlines
        AU$ 294
        61% off
        AU$ 754 AU$ 294
      • STL 13:00
        17h 25m
        1 stop
        WAS 14:00
        St. Louis - Washington D.C. | Fri, Sep 25 | Normal Airline
        WAS 15:00
        6h
        Direct
        STL 16:00
        Washington D.C. - St. Louis | Sun, Sep 27 | Normal Airline
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      • Cheapest nonstop
        STL 08:40
        2h 14m
        Direct
        IAD 11:54
        St. Louis - Washington D.C. | Fri, Oct 2 | United Airlines
        AU$ 210 AU$ 278
        24% off
        24% off
        AU$ 278 AU$ 210
      • STL 08:30
        2h 16m
        Direct
        IAD 11:46
        St. Louis - Washington D.C. | Thu, Nov 5 | United Airlines
        AU$ 225 AU$ 278
        19% off
        19% off
        AU$ 278 AU$ 225
      • STL 14:29
        8h 41m
        1 stop
        IAD 00:10
        St. Louis - Washington D.C. | Sat, Oct 10 | Frontier Airlines
        AU$ 94 AU$ 278
        66% off
        66% off
        AU$ 278 AU$ 94
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Sat, Oct 17 | Frontier Airlines
        AU$ 99
        64% off
        AU$ 278 AU$ 99
      • STL 14:29
        25h 49m
        1 stop
        IAD 17:18
        St. Louis - Washington D.C. | Mon, Oct 5 | Frontier Airlines
        AU$ 103
        63% off
        AU$ 278 AU$ 103
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Mon, Oct 12 | Frontier Airlines
        AU$ 104
        63% off
        AU$ 278 AU$ 104
      • STL 14:29
        8h 41m
        1 stop
        IAD 00:10
        St. Louis - Washington D.C. | Thu, Oct 8 | Frontier Airlines
        AU$ 119
        56% off
        AU$ 278 AU$ 119
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Mon, Oct 19 | Frontier Airlines
        AU$ 124
        55% off
        AU$ 278 AU$ 124
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Sat, Oct 24 | Frontier Airlines
        AU$ 124
        55% off
        AU$ 278 AU$ 124
      • STL 16:30
        16h 47m
        1 stop
        IAD 10:17
        St. Louis - Washington D.C. | Thu, Oct 15 | Frontier Airlines
        AU$ 133
        52% off
        AU$ 278 AU$ 133
      • STL 18:35
        4h 46m
        1 stop
        IAD 00:21
        St. Louis - Washington D.C. | Thu, Oct 22 | Frontier Airlines
        AU$ 134
        52% off
        AU$ 278 AU$ 134
      • STL 14:29
        8h 41m
        1 stop
        IAD 00:10
        St. Louis - Washington D.C. | Sat, Oct 3 | Frontier Airlines
        AU$ 137
        51% off
        AU$ 278 AU$ 137
      • STL 14:29
        8h 41m
        1 stop
        IAD 00:10
        St. Louis - Washington D.C. | Thu, Oct 1 | Frontier Airlines
        AU$ 142
        49% off
        AU$ 278 AU$ 142
      • STL 12:17
        17h 3m
        1 stop
        IAD 06:20
        St. Louis - Washington D.C. | Fri, Oct 9 | Frontier Airlines
        AU$ 145
        48% off
        AU$ 278 AU$ 145
      • STL 13:00
        17h 25m
        1 stop
        WAS 14:00
        St. Louis - Washington D.C. | Fri, Sep 25 | Normal Airline
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Flight prices from St. Louis Lambert International Airport to Dulles International Airport are based on the average fares across airlines for the next three months, based on Trip.com’s latest data.

Which airline offers the cheapest flights from St. Louis Lambert International Airport to Dulles International Airport?

The cheapest airline flying from St. Louis Lambert International Airport to Dulles International Airport is Frontier Airlines (from AU$ 99) among 4 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Frontier Airlines
From AU$ 99
Delta Air Lines
From AU$ 176
American Airlines
From AU$ 181
United Airlines
From AU$ 203

Find more flights and airlines

What is the flight schedule from St. Louis Lambert International Airport to Dulles International Airport?

Check the schedule for flights from St. Louis to Washington D.C. and find the flight that best matches your travel plans.

Flight info.
Departure
Arrival
Weekly Schedule

  1. AA1515

    St. Louis Lambert International Airport

    05:32

    STL

    1h 57m

    Direct

    08:29

    CLT

    S M T W T F S
    Search

  2. AA5154

    Charlotte Douglas International Airport

    10:25

    CLT

    1h 31m

    Direct

    11:56

    IAD

    S M T W T F S

  3. AA3096

    St. Louis Lambert International Airport

    12:50

    STL

    1h 55m

    Direct

    15:45

    CLT

    S M T W T F S
    Search

  4. AA1954

    Charlotte Douglas International Airport

    17:37

    CLT

    1h 22m

    Direct

    18:59

    IAD

    S M T W T F S

  5. DL1393

    St. Louis Lambert International Airport

    18:54

    STL

    1h 41m

    Direct

    21:35

    ATL

    S M T W T - S
    Search

  6. DL2549

    Hartsfield–Jackson Atlanta International Airport

    22:40

    ATL

    1h 40m

    Direct

    00:20

    IAD

    S M T W T F S

  7. AA712

    St. Louis Lambert International Airport

    07:30

    STL

    1h 57m

    Direct

    10:27

    CLT

    S M T W T F S
    Search

  8. AA5154

    Charlotte Douglas International Airport

    10:25

    CLT

    1h 31m

    Direct

    11:56

    IAD

    S M T W T F S

  9. DL1524

    St. Louis Lambert International Airport

    06:00

    STL

    1h 40m

    Direct

    08:40

    ATL

    S M T W T F S
    Search

  10. DL1444

    Hartsfield–Jackson Atlanta International Airport

    09:44

    ATL

    1h 46m

    Direct

    11:30

    IAD

    S M T W T - S

  11. F94474

    St. Louis Lambert International Airport

    14:29

    STL

    1h 41m

    Direct

    17:10

    ATL

    S - T - T - -
    Search

  12. F93692

    Hartsfield–Jackson Atlanta International Airport

    22:24

    ATL

    1h 46m

    Direct

    00:10

    IAD

    S M T W T F S

  13. UA4423

    St. Louis Lambert International Airport

    06:40

    STL

    1h 20m

    Direct

    08:00

    ORD

    S - T W T F S
    Search

  14. UA2277

    O'Hare International Airport

    08:42

    ORD

    2h 7m

    Direct

    11:49

    IAD

    S M T W T F S

  15. UA2792

    St. Louis Lambert International Airport

    08:00

    STL

    1h 31m

    Direct

    09:31

    ORD

    - - - W T F -
    Search

  16. UA1486

    O'Hare International Airport

    10:30

    ORD

    2h

    Direct

    13:30

    IAD

    - - - W T F -

  17. DL543

    St. Louis Lambert International Airport

    17:30

    STL

    1h 40m

    Direct

    20:10

    ATL

    S M T W T F S
    Search

  18. DL2549

    Hartsfield–Jackson Atlanta International Airport

    22:40

    ATL

    1h 40m

    Direct

    00:20

    IAD

    S M T W T F S

  19. DL1524

    St. Louis Lambert International Airport

    06:00

    STL

    1h 40m

    Direct

    08:40

    ATL

    S M T W T F S
    Search

  20. DL2135

    Hartsfield–Jackson Atlanta International Airport

    13:00

    ATL

    1h 41m

    Direct

    14:41

    IAD

    S M T W T F S
Find more flights and airlines

About St. Louis Lambert International Airport and Dulles International Airport

Learn about St. Louis Lambert International Airport (STL) and Dulles International Airport (IAD) — including location, terminals, transportation, and travel tips.

Flight distance1,119.28km
Cheapest one-way ticket priceAU$ 94
Cheapest return ticket priceAU$ 169

FAQs for St. Louis Lambert International Airport to Dulles International Airport Flights

  • How long is the flight from St. Louis Lambert International Airport to Dulles International Airport?

    St. Louis Lambert International Airport to Dulles International Airport takes about 1 hour 43 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 2 daily flights from St. Louis Lambert International Airport (STL) to Dulles International Airport (IAD).
  • The earliest flight from St. Louis Lambert International Airport to Dulles International Airport departs at 08:40, and the last departs at 13:00, with about 2 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from St. Louis Lambert International Airport (STL) to Dulles International Airport (IAD) is quite popular. Without considering departure times or holidays, tickets cost around AU$ 422 in September, the most expensive month to book this route.
  • United Airlines is a very popular airline operating an average of 626 flights per month.
  • One-way flights from St. Louis Lambert International Airport to Dulles International Airport currently start from AU$ 94, and round-trip fares start from AU$ 169. The current lowest fare is a Frontier Airlines flight departing on Sat, Oct 10; prices may vary depending on availability.
  • Yes. United Airlines operate direct flights from St. Louis Lambert International Airport to Dulles International Airport, with an average flight time of 1 hour 41 minutes, and around 14 weekly flights. Actual flight frequency may vary by season.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from St. Louis Lambert International Airport to Dulles International Airport is AU$ 259. Prices may vary depending on the departure date, airline, and availability.
  • St. Louis Lambert International Airport to Dulles International Airport operates around 10 weekly flights, mainly by United Airlines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter St. Louis Lambert International Airport and Dulles International Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

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

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Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are shown before payment. Charges for checked baggage, meals, Wi-Fi, and other optional services may also appear in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours, and with many routes refreshed in real time. The more popular the route, the more accurate 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.