How much does it cost to fly round-trip from Washington, D.C. to St. Louis?

Airfare is below average for this route at the moment. Washington, D.C. to St. Louis flights typically cost between $265 and $568 in October. The cheapest round-trip price found within the last 3 days was $143 on Frontier (Oct 11-Oct 13).

How long is the flight from Washington, D.C. to St. Louis?

A quick flight from Washington, D.C. to St. Louis can take about 5h 32m. Frontier provides one of the quickest options available for as low as $143. There are 736 mi between Washington, D.C. and St. Louis. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

What are the cheapest airlines flying from Washington, D.C. to St. Louis round-trip?

Our cheapest airline available from Washington, D.C. to St. Louis is American Airlines. Our recent data shows that you can find tickets from as low as $179 on this airline. Additional options worth looking into are Southwest and Delta, starting at $188 and $196 round-trip. These flights start at 44% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from Washington, D.C. to St. Louis one-way?

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $73. United Airlines flights start at $76 while deals on Delta start at $99 one-way.

How far ahead should I book a flight from Washington, D.C. to St. Louis?

To ensure you get the cheapest price possible for a flight from Washington, D.C. to St. Louis, you should look to book at least 48 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Washington, D.C. to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to St. Louis (average of $311). Flying from Washington, D.C. to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest day to fly from Washington, D.C. to St. Louis?

Travelers seeking maximum savings on their Washington, D.C. to St. Louis flight should consider departing on Wednesday evenings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Washington, D.C. to St. Louis

The most flights from WAS to STL are scheduled on a Monday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What are the most popular routes from Washington, D.C. to St. Louis?

When deciding which route to take from Washington, D.C. to St. Louis consider Washington, D.C. Reagan-National - Lambert-St Louis, Washington, D.C. Dulles Intl - Lambert-St Louis or Baltimore/Washington - Lambert-St Louis as they are the most popular.

What are the cheapest flights from Washington, D.C. to St. Louis?

The cheapest flight price from Washington, D.C. to St. Louis is $115. On average you can expect to pay $452. The most popular route, (Washington, D.C. Reagan-National - Lambert-St Louis), can usually be booked for $165.

What are the most reliable airlines from Washington, D.C. to St. Louis?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. to St. Louis on time: United Airlines (86%), GoJet (78%), Avianca (78%).

What are the most popular airlines that fly from Washington, D.C. to St. Louis?

When booking a flight from Washington, D.C. to St. Louis, you may want to consider flying on American Airlines, Delta or United Airlines as they are the most popular for this route.

What is the cheapest time of day to fly from WAS to STL?

It’s optimal to fly from Washington, D.C. to St. Louis at noon. By choosing this option you can save up to 19% on the cost of your flight, compared to a flight in the afternoon.

What airport do you fly into for flights to St. Louis from Washington, D.C.?

Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to St. Louis. 5 airlines have flights to Lambert-St Louis from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Lambert-St Louis should not be difficult; the airport handles an average of 14 inbound flights from Washington, D.C. per day.

Can I find deals for flights from Washington, D.C. to St. Louis that include hotel bookings?

Yes. In addition to deals on Washington, D.C. to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Washington, D.C. to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to St. Louis.

Can I find deals for business class flights from Washington, D.C. to St. Louis?

Yes. Cheapflights offers flight deals from Washington, D.C. to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$65+ Cheap Flights from Washington, D.C. to St. Louis

Round-trip from	$143 (Mytrip)
One-way from	$65 (American Airlines)
Popular in	March
Cheapest in	August
Average price	$317
Good round-trip deal	$284 or less
Good one-way deal	$148 or less

DCA

DCA is easily accessible via the Metro, offering a clean and affordable way to reach the airport from D.C. and nearby Maryland.

IAD

IAD's Aerotrain connects the main terminal to concourses, but pay attention to signage for the correct train direction.

STL

STL's MetroLink offers a convenient and economical way to reach downtown St. Louis in about 40 minutes.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$109	Average$179	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$167	Average$310	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$169	Average$282	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$188	Average$342	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$271	Average$478	FlexibilityNo cancel fee	On-time69%

$65+ Cheap flights from Washington, D.C. (WAS) to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to St. Louis with Cheapflights

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Cheapflights Tip: The best prices from Washington, D.C. to Lambert-St Louis are usually found in August or May, booked 61 days in advance, depart on a Wednesday or Tuesday and return on a Friday

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Cheapest flights from Washington, D.C. to St. LouisExplore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 16, 2025.

Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 16, 2025.

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Best time to book a flight from Washington, D.C. to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Washington, D.C. with our price prediction graph.

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Everything you need to know about your flight from Washington, D.C. to St. Louis

How far ahead should I book a flight from Washington, D.C. to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to St. Louis. Price data was last updated on September 12, 2025.

What is the cheapest month to book a flight from Washington, D.C. to St. Louis?

What is the cheapest time of day to fly from WAS to STL?

Find hourly flight availability from Washington, D.C. to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 16, 2025.

What is the cheapest day to fly from Washington, D.C. to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to St. Louis. Price data was last updated on September 14, 2025.

Weekly flight availability from Washington, D.C. to St. Louis

How much does it cost to fly round-trip from Washington, D.C. to St. Louis?

Reviews of airlines servicing St. Louis

See what other customers who have flown with Southwest, Delta, and United Airlines from Washington, D.C. to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to St. Louis from Washington, D.C.?

How long is the flight from Washington, D.C. to St. Louis?

What are the cheapest airlines flying from Washington, D.C. to St. Louis round-trip?

What are the cheapest airlines to fly from Washington, D.C. to St. Louis one-way?

What are the most popular routes from Washington, D.C. to St. Louis?

What are the most reliable airlines from Washington, D.C. to St. Louis?

What are the cheapest flights from Washington, D.C. to St. Louis?

Can I find deals for flights from Washington, D.C. to St. Louis that include hotel bookings?

How can I find direct flights from Washington, D.C. to St. Louis?

Can I find deals for business class flights from Washington, D.C. to St. Louis?

What is the cheapest month to book a flight from Washington, D.C. to St. Louis?

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Cheapest flights from Washington, D.C. to St. Louis
Explore the most affordable flight options available from Washington, D.C. to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 16, 2025.