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CA $176 Cheap Flights from Washington (DCA) to St. Louis (STL)

View CA $176 flight on Thu, Oct 29, 2026Opens in a new window

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

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Cheap flights from Washington (DCA) to St. Louis (STL)

Prices were available within the past 7 days and start at CA $176 for one-way flights and CA $379 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Nov 3 - Mon, Nov 16
DCA
Washington
STL
St. Louis
CA $379 Roundtrip, found 18 hours ago
CA $379
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, Nov 3 from Washington to St. Louis, returning Mon, Nov 16, priced at CA $379 found 18 hours ago
Delta
Sat, Oct 10 - Mon, Oct 26
DCA
Washington
STL
St. Louis
CA $405 Roundtrip, found 18 hours ago
CA $405
Roundtrip
found 18 hours ago
Select Delta flight, departing Sat, Oct 10 from Washington to St. Louis, returning Mon, Oct 26, priced at CA $405 found 18 hours ago
Delta
Mon, Dec 14 - Tue, Dec 29
DCA
Washington
STL
St. Louis
CA $438 Roundtrip, found 18 hours ago
CA $438
Roundtrip
found 18 hours ago
Select Delta flight, departing Mon, Dec 14 from Washington to St. Louis, returning Tue, Dec 29, priced at CA $438 found 18 hours ago
American Airlines
Thu, Oct 29 - Sun, Nov 1
DCA
Washington
STL
St. Louis
CA $443 Roundtrip, found 2 days ago
CA $443
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Oct 29 from Washington to St. Louis, returning Sun, Nov 1, priced at CA $443 found 2 days ago
American Airlines
Sun, Nov 1 - Sat, Nov 7
DCA
Washington
STL
St. Louis
CA $444 Roundtrip, found 18 hours ago
CA $444
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Sun, Nov 1 from Washington to St. Louis, returning Sat, Nov 7, priced at CA $444 found 18 hours ago
Southwest Airlines
Thu, Oct 29 - Sun, Nov 1
DCA
Washington
STL
St. Louis
CA $456 Roundtrip, found 2 days ago
CA $456
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, Oct 29 from Washington to St. Louis, returning Sun, Nov 1, priced at CA $456 found 2 days ago
American Airlines
Thu, Oct 29 - Sun, Nov 1
DCA
Washington
STL
St. Louis
CA $456 Roundtrip, found 2 days ago
CA $456
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Oct 29 from Washington to St. Louis, returning Sun, Nov 1, priced at CA $456 found 2 days ago
American Airlines
Sun, Nov 1 - Sat, Nov 7
DCA
Washington
STL
St. Louis
CA $457 Roundtrip, found 18 hours ago
CA $457
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Sun, Nov 1 from Washington to St. Louis, returning Sat, Nov 7, priced at CA $457 found 18 hours ago
American Airlines
Mon, Dec 14 - Thu, Dec 31
DCA
Washington
STL
St. Louis
CA $463 Roundtrip, found 18 hours ago
CA $463
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Mon, Dec 14 from Washington to St. Louis, returning Thu, Dec 31, priced at CA $463 found 18 hours ago
United
Thu, Oct 29 - Sun, Nov 1
DCA
Washington
STL
St. Louis
CA $511 Roundtrip, found 2 days ago
CA $511
Roundtrip
found 2 days ago
Select United flight, departing Thu, Oct 29 from Washington to St. Louis, returning Sun, Nov 1, priced at CA $511 found 2 days ago

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 one-way and return flights from DCA to STL with Expedia. 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 our cheapest fares first, and use the Price Tracking tool to receive alerts when DCA to STL ticket fares go up or down.
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 months to fly from DCA to STL are typically during off-peak season 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 are 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.)?
There are 2 airlines offering direct flights from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.). These include:
  • American Airlines operates 28 direct flights from Ronald Reagan Washington National to Lambert-St. Louis Intl. every week.
  • Southwest Airlines operates 28 direct flights from Ronald Reagan Washington National to Lambert-St. Louis Intl. every week.
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-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will differ from traveler to traveler. If you like to fly early, American Airlines offers early morning flights. If price is the most important factor, Southwest Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.), 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.)?
You'll find approximately 8 nonstop flights per day from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.). For even more choices, look at flights that include layovers, as there are around 114 connecting flights per day. Some common connection points include O'Hare Intl. (ORD), Hartsfield-Jackson Atlanta Intl. (ATL), and Midway Intl. (MDW).
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-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically departs at around 5:00 AM local time. This flight is operated by American Airlines. This is a seasonal service, active only in May. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You'll find the most flights from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) on Fridays, with around 72 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, American Airlines, and United. Flight schedules are fairly consistent throughout the week, with Fridays offering only slightly more options than other weekdays.
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-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) are in the early morning, from 6am to 9am. Many major carriers, including Southwest Airlines, American Airlines and Delta, offer flights during this window. Many travellers prefer these times because it allows them to arrive at their destination early, giving them a full day for business or leisure activities.
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 non-stop flight from Washington, DC (DCA-Ronald Reagan Washington National) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically takes around 2 hours 30 minutes, covering a distance of approximately 1,154 kilometers. If you opt for a one-stop flight, your journey will usually be longer, averaging around 7 hours. Flights with two or more stops generally take even more time, often around 8 hours 48 minutes. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to allow for some extra time when planning your trip.
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 business or first class between DCA and STL. You can fly business class with Frontier Airlines.First class cabins are available on Alaska Airlines, Delta, United, and American Airlines.
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, MO (STL) from Washington, DC (DCA)?
If you're planning to travel to St. Louis from Ronald Reagan Washington National (DCA), you can fly directly into Lambert-St. Louis International Airport (STL). Some flights may connect through major hubs like Hartsfield-Jackson Atlanta International Airport (ATL), Love Field (DAL), or John Glenn Columbus International Airport (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) to St. Louis, MO (STL) at the last minute?
Typically, booking a last minute flight from Washington, DC (DCA) to St. Louis, MO (STL) 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) to St. Louis, MO (STL) flight and hotel package?
Securing a Washington, DC (DCA) to St. Louis, MO (STL) flight and hotel package 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
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
CA $379
Distance
1147 km
Average flight time
1 hour 12 mins

Book with confidence

Washington to St. Louis Flights

The easy way to book your flights from Washington to St. Louis 

With Expedia, it’s simple to find and book flights to St. Louis from Washington whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Lambert-St. Louis Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Washington to St. Louis today, tomorrow, or this week.  

 

Save dollars with cheap flights from Ronald Reagan Washington National, DCA to Lambert-St. Louis Intl., STL 

Sort your search results by price to find great deals on your flight from Washington to St. Louis—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to St. Louis from Washington currently is just CA $379 rising to CA $511.  

Here are more money-saving tips: 

  • Fly in November when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to St. Louis  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to St. Louis from Washington 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to St. Louis with Expedia today.

Washington to St. Louis Flights

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