A city skyline with a prominent arch bridge at sunset.

$116 Cheap Flights from Washington (DCA) to St. Louis (STL)

View $116 flight on Wed, Oct 21, 2026Opens in a new window

Popular airlines from Ronald Reagan Washington National Airport (DCA) to St. Louis Lambert Intl. Airport (STL)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Washington to St. Louis (DCA-STL)

Prices were available within the past 7 days and start at $116 for one-way flights and $207 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Oct 28 - Fri, Oct 30
DCA
Washington
STL
St. Louis
$207 Roundtrip, found 3 days ago
$207
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Oct 28 from Washington to St. Louis, returning Fri, Oct 30, priced at $207 found 3 days ago
Frontier Airlines
Fri, Nov 6 - Sat, Nov 14
DCA
Washington
STL
St. Louis
$227 Roundtrip, found 3 days ago
$227
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sat, Nov 14, priced at $227 found 3 days ago
Delta
Tue, Oct 13 - Thu, Oct 15
DCA
Washington
STL
St. Louis
$229 Roundtrip, found 3 days ago
$229
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Oct 13 from Washington to St. Louis, returning Thu, Oct 15, priced at $229 found 3 days ago
Delta
Tue, Nov 17 - Thu, Nov 26
DCA
Washington
STL
St. Louis
$237 Roundtrip, found 3 days ago
$237
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Nov 17 from Washington to St. Louis, returning Thu, Nov 26, priced at $237 found 3 days ago
Southwest Airlines
Mon, Nov 2 - Mon, Nov 9
DCA
Washington
STL
St. Louis
$242 Roundtrip, found 3 days ago
$242
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Mon, Nov 2 from Washington to St. Louis, returning Mon, Nov 9, priced at $242 found 3 days ago
Southwest Airlines
Wed, Nov 18 - Mon, Nov 23
DCA
Washington
STL
St. Louis
$243 Roundtrip, found 2 hours ago
$243
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Wed, Nov 18 from Washington to St. Louis, returning Mon, Nov 23, priced at $243 found 2 hours ago
Frontier Airlines
Fri, Nov 6 - Sat, Nov 14
DCA
Washington
STL
St. Louis
$244 Roundtrip, found 3 days ago
$244
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Fri, Nov 6 from Washington to St. Louis, returning Sat, Nov 14, priced at $244 found 3 days ago
Southwest Airlines
Mon, Oct 12 - Tue, Oct 13
DCA
Washington
STL
St. Louis
$252 Roundtrip, found 3 days ago
$252
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Mon, Oct 12 from Washington to St. Louis, returning Tue, Oct 13, priced at $252 found 3 days ago
American Airlines
Thu, Nov 19 - Mon, Nov 23
DCA
Washington
STL
St. Louis
$255 Roundtrip, found 2 hours ago
$255
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Thu, Nov 19 from Washington to St. Louis, returning Mon, Nov 23, priced at $255 found 2 hours ago
United
Wed, Jan 13 - Mon, Jan 18
DCA
Washington
STL
St. Louis
$275 Roundtrip, found 6 hours ago
$275
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Jan 13 from Washington to St. Louis, returning Mon, Jan 18, priced at $275 found 6 hours ago

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $953
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $953

What you need to know for your flight from Ronald Reagan Washington National to Lambert-St. Louis Intl.

Washington (DCA) to St. Louis (STL) at a glance

Travel from Washington (DCA) to St. Louis (STL) with a selection of airlines on this domestic short-haul route. Discover cheap flights from Washington and weigh your options between full-service and budget carriers to find the itinerary that best aligns with your travel plans and budget. As you prepare to explore the iconic sights and neighborhoods of St. Louis, keep an eye on STL flight status for the latest updates on your next flight from Ronald Reagan Washington National Airport to Lambert-St. Louis International Airport.

  • Fastest flight duration: around 2h 15m non-stop
  • Route distance: roughly 700 miles (1,130 km)
  • Flights per week: around 25+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $90–$400, depending on seasonality and how far ahead you book

Flights from Ronald Reagan Washington National Airport (DCA) to Lambert-St. Louis International Airport (STL)

Based on the latest traveler bookings, here are the top airlines favored for flights from Washington to St. Louis, particularly for non-stop and one-stop options. Common layover points include O'Hare International Airport (ORD) with a layover of about 1 hour and 15 minutes, Detroit Metropolitan Wayne County Airport (DTW) also around 1 hour and 15 minutes, and Hartsfield-Jackson Atlanta International Airport (ATL) with a layover of approximately 1 hour. These choices allow you to balance price, total travel time, and cabin class to craft your ideal itinerary.

  • Southwest Airlines: This budget-friendly airline provides both non-stop and one-stop flights, with one-way prices generally falling between $90 and $410. Southwest handles about 49% of departures on this route, and the average non-stop flight duration is 2 hours and 15 minutes.
  • American Airlines: Known as a full-service airline, American Airlines offers non-stop and one-stop options, with one-way fares usually ranging from $90 to $400. They account for roughly 46% of flights on this route, and expect a typical non-stop travel time of 2 hours and 15 minutes.
  • Delta: As a full-service airline, Delta provides one-stop services, with one-way ticket prices often between $100 and $350. They represent about 3% of departures on this route, featuring an in-flight duration of 3 hours and 45 minutes, leading to a total travel time of around 5 hours including layovers.
  • United: Another full-service option, United offers one-stop flights with one-way fares typically ranging from $100 to $355. They make up about 2% of departures for this route, with an in-flight time of 3 hours and 45 minutes, totaling approximately 5 hours of travel time including layovers.
  • Frontier Airlines: This low-cost airline specializes in one-stop services, with one-way fares generally priced between $90 and $230. Expect 3 hours and 45 minutes in the air, leading to a total journey time of about 5 hours including any layovers.

Travelers can opt to upgrade their flight from Washington to St. Louis, where American Airlines provides first-class service on this route.

Best time to fly from Washington (DCA) to St. Louis (STL)

The most popular months for travelers flying from Washington to St. Louis are March, April, and July, when peak temperatures in St. Louis reach up to 78.6°F in July. If you prefer quieter travel, consider September, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 70.9°F. For better deals, August usually offers the lowest average one-way fare around $166. Flight availability peaks in July, with approximately 35 flights per week, making it easier to find convenient departure times. January and February have the fewest flights, with approximately 17 flights per week.

  • Cheapest time to fly: August usually offers good deals with average one-way fare around $166, roughly 17% cheaper than the yearly average.
  • Another budget-friendly time to fly: July typically offers an average one-way fare of around $188.
  • Most flight options: July has the highest number of flights from Washington to St. Louis, with approximately 35 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Average17$203
February34.9°F (1.6°C)Moderately Low17$196
March46.4°F (8.0°C)Moderately High24$233
April56.1°F (13.4°C)Moderately High27$213
May66.6°F (19.2°C)Average31$191
June76.1°F (24.5°C)Average29$200
July78.6°F (25.9°C)Moderately High35$188
August77.0°F (25.0°C)Average27$166
September70.9°F (21.6°C)Moderately Low28$191
October58.6°F (14.8°C)Average33$204
November46.2°F (7.9°C)Average32$221
December37.8°F (3.2°C)Moderately Low25$214

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from Washington (DCA) to St. Louis (STL)

  • Washington to St. Louis (IAD-STL): Washington Dulles International Airport (IAD) is located approximately 23 miles from Ronald Reagan Washington National Airport (DCA). One-way economy fares for this journey generally fall between $100 and $455, varying according to the season and how far in advance you book. Travelers can choose from both non-stop and one-stop flights on this route. Major airlines servicing this route include United and Delta, with first-class service also available.

How to find the best prices for flights from Washington (DCA) to St. Louis (STL)

Getting some of the best deals on flights from Washington to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually available when booking at least two months in advance, but most travelers tend to book between two to eight weeks ahead. Morning flights from 5 AM to 12 PM often offer better prices, while afternoon flights from 12 PM to 6 PM are more popular. Additionally, flying on Wednesday generally yields lower prices, although Friday is the busiest travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Ronald Reagan Washington National Airport

St. Louis welcomes travelers from Washington with a range of transport options based on price, convenience, and proximity. For departures, Ronald Reagan Washington National Airport is roughly a 10-minute drive (covering about 5 miles) from central Washington. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is located about 0.1 miles away on foot, providing easy access to public transportation for travelers.

Frequently asked questions

How much does a flight from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $116 and cheap return flights from $207 Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights typically cost between $136 and $767, and return flights often range between $299 and $1010. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The cheapest month to fly from DCA to STL is October when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly direct from DCA to STL on American Airlines, with around 25 flights per week.
What is the cheapest airline that flies from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
American Airlines is one of the cheapest airlines offering nonstop flights from Ronald Reagan Washington National (DCA) to Lambert-St. Louis Intl. (STL), with round-trip tickets starting from around $386. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Washington, DC (DCA) to St. Louis (STL) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. American Airlines offers the most daily flights from DCA to STL, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are approximately 7 nonstop flights per day from Ronald Reagan Washington National (DCA) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Washington, DC (DCA) to St. Louis (STL) typically departs at 5:00 AM, operated by American Airlines. This seasonal service is available in May, giving you an early start to your day in St. Louis. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Washington, DC (DCA) to St. Louis, MO (STL) are in the early morning, from 6am to 9am. This time window accounts for around 31% of total passenger traffic, indicating a strong preference for morning departures. Delta, United Airlines, and Southwest Airlines all offer flights during this busy period.
How long does it take to fly from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A nonstop flight from DCA to STL typically takes around 2 hours 30 minutes, covering approximately 717 miles. Connecting flights on this route usually add 2 hours 30 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly first class between DCA and STL. First class cabins are available on:

  • Delta Air Lines
  • United Airlines
  • American Airlines

How much is a business class flight from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A direct, return business class ticket from Washington, DC (DCA) to St. Louis, MO (STL) typically costs between $761 - $1,111. A non-stop, one-way business class flight is usually around $580 - $730. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
How do I earn miles on a Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Ronald Reagan Washington National (DCA)?
From Ronald Reagan Washington National (DCA), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Hartsfield-Jackson Atlanta Intl. (ATL), Love Field (DAL), John Glenn Columbus Intl. (CMH) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Ronald Reagan Washington National
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$207
Distance
716 mi
Average flight time
1 hour 12 mins

Book with confidence

Washington to St. Louis Flights

The cheapest times to fly from Washington to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to St. Louis are during the month of October. You can find some of the cheapest flights from Washington to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to St. Louis

Sunday is one of the best days to book for cheap flights from Washington to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to St. Louis in 2026. You can also book with separate airlines for your outbound and return journeys, from $116 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Washington to St. Louis Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

Explore a world of travel with Expedia