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Flights from Washington D.C. to St. Louis

Flight Info | Washington D.C. to St. Louis

The distance between Washington D.C. and St. Louis is approximately 1,139.76 km. It takes around 2 hours 20 minutes on average to fly from Washington D.C. to St. Louis. Based on Trip.com's data, travel demand peaks in July.

Cheapest one-way
$72
Frontier Airlines Frontier Airlines WAS-STL 6h 20m · 1 stop Fri, Sep 11
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Cheapest round-trip
$208
Frontier Airlines Frontier Airlines WAS-STL 9h 51m · 2 stops Mon, Aug 31 - Wed, Sep 2
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Recommended airlines
Frontier Airlines Frontier Airlines Cheapest · From $72 American Airlines American Airlines Most booked
When to travel
October
Cheapest
July
Peak season for travel
Route details
1,139.76 km
Flight distance
2h 20m
Average flight time

Find flight deals from Washington D.C. to St. Louis for the next 3 months. Book one way flights from $72 or round trip flights from $231.

      • Cheapest nonstop
        DCA 8:40 AM
        2h 34m
        Nonstop
        STL 10:14 AM
        Washington D.C. - St. Louis | Tue, Aug 25 | American Airlines
        STL 10:44 AM
        2h 33m
        Nonstop
        DCA 2:17 PM
        St. Louis - Washington D.C. | Thu, Aug 27 | American Airlines
        $231 $334
        31% off
        31% off
        $334 $231
      • DCA 8:40 AM
        2h 34m
        Nonstop
        STL 10:14 AM
        Washington D.C. - St. Louis | Wed, Aug 19 | American Airlines
        STL 7:00 AM
        2h 13m
        Nonstop
        DCA 10:13 AM
        St. Louis - Washington D.C. | Sat, Aug 22 | American Airlines
        $238 $334
        28% off
        28% off
        $334 $238
      • IAD 8:59 AM
        9h 51m
        1 stop
        STL 5:50 PM
        Washington D.C. - St. Louis | Mon, Aug 31 | Frontier Airlines
        STL 6:45 PM
        12h 19m
        1 stop
        IAD 8:04 AM
        St. Louis - Washington D.C. | Wed, Sep 2 | Frontier Airlines
        $208 $334
        38% off
        38% off
        $334 $208
      • DCA 10:10 AM
        7h 13m
        1 stop
        STL 4:23 PM
        Washington D.C. - St. Louis | Wed, Oct 7 | Delta Air Lines
        STL 6:00 PM
        4h 11m
        1 stop
        IAD 11:11 PM
        St. Louis - Washington D.C. | Mon, Oct 12 | Delta Air Lines
        $213
        36% off
        $334 $213
      • IAD 6:20 AM
        14h 40m
        1 stop
        STL 8:00 PM
        Washington D.C. - St. Louis | Tue, Aug 25 | Frontier Airlines
        STL 3:55 PM
        2h
        Nonstop
        DCA 6:55 PM
        St. Louis - Washington D.C. | Thu, Aug 27 |
        $215
        36% off
        $334 $215
      • DCA 7:45 PM
        4h 36m
        1 stop
        STL 11:21 PM
        Washington D.C. - St. Louis | Tue, Aug 25 | Delta Air Lines
        STL 7:55 PM
        2h
        Nonstop
        DCA 10:55 PM
        St. Louis - Washington D.C. | Thu, Aug 27 |
        $227
        32% off
        $334 $227
      • WAS 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Washington D.C. - St. Louis | Wed, Aug 19 | Normal Airline
        STL 3:00 PM
        6h
        Nonstop
        WAS 4:00 PM
        St. Louis - Washington D.C. | Fri, Aug 21 | Normal Airline
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      • IAD 7:50 AM
        6h 20m
        1 stop
        STL 1:10 PM
        Washington D.C. - St. Louis | Fri, Sep 11 | Frontier Airlines
        $72 $142
        49% off
        49% off
        $142 $72
      • IAD 8:39 PM
        21h 43m
        1 stop
        STL 5:22 PM
        Washington D.C. - St. Louis | Wed, Aug 19 | Frontier Airlines
        $73 $142
        49% off
        49% off
        $142 $73
      • IAD 8:59 AM
        9h 51m
        1 stop
        STL 5:50 PM
        Washington D.C. - St. Louis | Thu, Aug 27 | Frontier Airlines
        $80 $142
        44% off
        44% off
        $142 $80
      • IAD 7:50 AM
        6h 20m
        1 stop
        STL 1:10 PM
        Washington D.C. - St. Louis | Wed, Sep 30 | Frontier Airlines
        $83
        42% off
        $142 $83
      • IAD 11:12 AM
        6h 12m
        1 stop
        STL 4:24 PM
        Washington D.C. - St. Louis | Thu, Sep 17 | Frontier Airlines
        $85
        40% off
        $142 $85
      • IAD 11:12 AM
        7h 42m
        1 stop
        STL 5:54 PM
        Washington D.C. - St. Louis | Thu, Sep 10 | Frontier Airlines
        $86
        39% off
        $142 $86
      • DCA 1:00 PM
        7h 17m
        1 stop
        STL 7:17 PM
        Washington D.C. - St. Louis | Wed, Sep 16 | Frontier Airlines
        $86
        39% off
        $142 $86
      • DCA 1:06 PM
        7h 11m
        1 stop
        STL 7:17 PM
        Washington D.C. - St. Louis | Sat, Oct 3 | Frontier Airlines
        $87
        39% off
        $142 $87
      • IAD 9:16 PM
        13h 24m
        1 stop
        STL 9:40 AM
        Washington D.C. - St. Louis | Sun, Oct 11 | Frontier Airlines
        $88
        38% off
        $142 $88
      • DCA 6:00 PM
        26h 17m
        1 stop
        STL 7:17 PM
        Washington D.C. - St. Louis | Tue, Sep 15 | Frontier Airlines
        $90
        37% off
        $142 $90
      • WAS 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Washington D.C. - St. Louis | Wed, Aug 19 | Normal Airline
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Popular airlines from Washington D.C. to St. Louis

You can choose from 3 airlines that fly from Washington D.C. to St. Louis, including American Airlines, Delta Air Lines, and United Airlines. Frontier Airlines has lowest fares on this route.
American Airlines logo American Airlines
Delta Air Lines logo Delta Air Lines
United Airlines logo United Airlines
Airlines are determined based on actual purchased flight tickets from Washington D.C. to St. Louis according to previous 12 months data from Trip.com.

Frequently Asked Questions

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

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as $72 on Cheapest nonstop routes (e.g. IAD to STL on Fri, Sep 11), while Frontier Airlines offers Cheapest nonstop round-trips from $208 departing on Mon, Aug 31 and returning on Wed, Sep 2.
  • At the moment, you can catch a nonstop flight from Washington D.C. to St. Louis with the following airlines, including: American Airlines Delta Air Lines United Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes around 2 hours 20 minutes to fly from Washington D.C. (WAS) to St. Louis (STL).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Washington D.C. to St. Louis 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.
  • Based on Trip.com data in the past 4 weeks, there is 50 flight per week flying from Washington D.C. to St. Louis. You can check the weekly schedule for popular airlines on this route below: United Airlines: S/M/T/W/T/F/S -- UA4427 (09:22)
  • To find best deals on flights from Washington D.C. to St. Louis, 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 Fri, Sep 11, with one-way flights priced at just $72.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
    · 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 St. Louis travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Washington D.C. to St. Louis is October, when demand for travel is lower.
  • After crunching the numbers on our August flight calendar, it's currently cheapest to fly from Washington D.C. to St. Louis on August 27, 2026 with Frontier Airlines, with prices starting at $175.
  • You can land at any one of the following hubs in St. Louis, with Dulles International Airport to St. Louis Lambert International Airport (IAD-STL) is by far the most common option on this route: St. Louis Lambert International Airport (STL) St. Louis Downtown Airport (CPS).
  • The time difference between St. Louis and Washington D.C. 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.
  • Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Washington D.C. to St. Louis is $174. Fares vary by travel date, airline and availability.
  • Based on Trip.com data for travel in the next 30 days, the average round-trip fare from Washington D.C. to St. Louis is $343. The final price depends on the outbound and return dates, airline and fare conditions.
  • Enter Washington D.C. and St. Louis, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.

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

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Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
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.
Cancellation/change due to a flight schedule change:
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.