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

To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $99. United Airlines flights start at $100 while deals on Southwest start at $104 one-way.

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 cheapest flights from Washington, D.C. Reagan-National Airport to St. Louis?

Looking at all options, your cheapest flight can be booked for $89. While the most popular route (Washington, D.C. Reagan-National - Lambert-St Louis) can be booked for $197 on average our data indicates $255 when flying from Washington, D.C. Reagan-National Airport to St. Louis.

What are the most reliable airlines from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to St. Louis on time: Southwest (76%), American Airlines (67%), PSA Airlines (57%).

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

Before booking your flight from Washington, D.C. Reagan-National Airport to St. Louis check out the most popular airlines for this route: American Airlines, Delta or Southwest.

What is the cheapest day to fly round-trip from Washington, D.C. Reagan-National Airport to St. Louis?

Tuesday is generally a great day to depart. Flying on this day could help you save up to 17%.

What is the cheapest month to fly from Washington, D.C. Reagan-National Airport to St. Louis?

August can be a great time to fly to St. Louis from Washington, D.C. Reagan-National Airport with a flight ticket averaging about $329. Cheapflights users have found deals in the month of August for as cheap as $169. The most expensive prices can be found in the month of March.

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

Lambert-St Louis (STL) is the airport you will fly into if you book a flight from Washington, D.C. Reagan-National to St. Louis. You should not have trouble finding flights to Lambert-St Louis from Washington, D.C. Reagan-National; the airport handles an average of 4 inbound flights from Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 3 airlines have flights to the St. Louis airport from Washington, D.C. Reagan-National. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

Can I find deals for flights from Reagan-National to St. Louis that include hotel bookings?

Yes. In addition to deals on Reagan-National to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Reagan-National to St. Louis?

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

Can I find deals for business class flights from Reagan-National to St. Louis?

Yes. Cheapflights offers flight deals from Reagan-National 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.

$99+ Flights from Washington, D.C. Reagan-National Airport to St. Louis

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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Washington, D.C. Reagan-National to Lambert-St Louis are usually found in February or July, booked 74 days in advance, depart on a Wednesday or Friday and return on a Saturday

Cheap flight deals from Reagan-National to St. Louis

Round-trip from	$203 (Southwest)
One-way from	$99 (American Airlines)
Popular in	March
Cheapest in	February
Average price	$287
Good round-trip deal	$252 or less
Good one-way deal	$149 or less

From Washington, D.C. Reagan-National to Lambert-St Louis

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One-way flight from Washington, D.C. Reagan-National to Lambert-St Louis

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High demand for flights, 0% potential price rise

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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Price to beat on a round-trip flight from Washington, D.C. Reagan-National to Lambert-St Louis.

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Price to beat on a one-way flight from Washington, D.C. Reagan-National to Lambert-St Louis.

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Find flight deals from Reagan-National to St. Louis

Cheapest flights from Reagan-National to St. Louis
Explore the most affordable flight options available from Reagan-National to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 2, 2025.

mar. 8/198:00 amDCA - STL

Nonstop2h 10mSouthwest

jue. 8/219:50 amSTL - DCA

1 stop4h 05mSouthwest

Deal found 6/30

$203

jue. 8/141:00 pmDCA - STL

1 stop21h 11mFrontier

lun. 8/187:29 pmSTL - DCA

1 stop20h 30mFrontier

Deal found 6/30

$207

mar. 8/126:00 pmDCA - STL

1 stop5h 45mUnited Airlines

mar. 8/195:30 pmSTL - DCA

1 stop4h 13mUnited Airlines

Deal found 6/30

$217

jue. 9/2511:31 amDCA - STL

Nonstop2h 20mAmerican Airlines

lun. 9/296:05 amSTL - DCA

1 stop7h 19mAmerican Airlines

Deal found 7/1

$220

sáb. 8/166:00 amDCA - STL

1 stop4h 32mDelta

mar. 8/193:10 pmSTL - DCA

1 stop6h 46mDelta

Deal found 6/30

$231

Best flights from Reagan-National to St. Louis
Discover carefully curated flight deals from Reagan-National to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated julio 2, 2025.

mar. 8/198:00 amDCA - STL

Nonstop2h 10mSouthwest

jue. 8/219:50 amSTL - DCA

1 stop4h 05mSouthwest

Deal found 6/30

$203

jue. 8/141:00 pmDCA - STL

1 stop21h 11mFrontier

lun. 8/187:29 pmSTL - DCA

1 stop20h 30mFrontier

Deal found 6/30

$207

mar. 8/126:00 pmDCA - STL

1 stop5h 45mUnited Airlines

mar. 8/195:30 pmSTL - DCA

1 stop4h 13mUnited Airlines

Deal found 6/30

$217

jue. 9/2511:31 amDCA - STL

Nonstop2h 20mAmerican Airlines

lun. 9/296:05 amSTL - DCA

1 stop7h 19mAmerican Airlines

Deal found 7/1

$220

sáb. 8/166:00 amDCA - STL

1 stop4h 32mDelta

mar. 8/193:10 pmSTL - DCA

1 stop6h 46mDelta

Deal found 6/30

$231

Last-minute flights from Reagan-National to St. Louis
Discover last-minute flight deals from Reagan-National to St. Louis. Data last updated julio 2, 2025 and is based on user searches.

mié. 7/96:55 pmDCA - STL

Nonstop2h 15mSouthwest

vie. 7/111:05 pmSTL - DCA

Nonstop2h 00mSouthwest

Deal found 6/30

$529

mié. 7/97:59 amDCA - STL

1 stop5h 35mDelta

vie. 7/112:15 pmSTL - DCA

1 stop3h 44mDelta

Deal found 6/30

$549

mié. 7/96:00 amDCA - STL

1 stop5h 40mUnited Airlines

dom. 7/136:33 amSTL - DCA

1 stop4h 26mUnited Airlines

Deal found 6/29

$737

jue. 7/101:00 pmDCA - STL

1 stop21h 11mFrontier

sáb. 7/127:29 pmSTL - DCA

1 stop15h 35mFrontier

Deal found 7/1

$282

vie. 7/117:54 pmDCA - STL

Nonstop2h 25mAmerican Airlines

dom. 7/276:10 amSTL - DCA

1 stop4h 22mAmerican Airlines

Deal found 7/1

$413

mar. 8/126:00 pmDCA - STL

1 stop5h 45mUnited Airlines

mar. 8/195:30 pmSTL - DCA

1 stop4h 13mUnited Airlines

Deal found 7/1

$217

jue. 8/141:00 pmDCA - STL

1 stop21h 11mFrontier

lun. 8/187:29 pmSTL - DCA

1 stop20h 30mFrontier

Deal found 6/30

$207

sáb. 8/162:56 pmDCA - STL

Nonstop2h 18mAmerican Airlines

mar. 8/1910:10 amSTL - DCA

Nonstop2h 04mAmerican Airlines

Deal found 6/30

$211

sáb. 8/166:00 amDCA - STL

1 stop4h 32mDelta

mar. 8/193:10 pmSTL - DCA

1 stop6h 46mDelta

Deal found 6/30

$231

mar. 8/198:00 amDCA - STL

Nonstop2h 10mSouthwest

jue. 8/219:50 amSTL - DCA

1 stop4h 05mSouthwest

Deal found 6/30

$203

One-way flights from Reagan-National to St. Louis
Search for one-way flight options from Reagan-National to St. Louis. Find affordable one-way fares based on user searches. Data last updated julio 2, 2025.

jue. 9/252:56 pmDCA - STL

Nonstop2h 19mAmerican Airlines

Deal found 6/30

$99

dom. 8/3110:30 amDCA - STL

1 stop6h 14mUnited Airlines

Deal found 6/30

$100

lun. 9/223:40 pmDCA - STL

1 stop4h 05mSouthwest

Deal found 6/30

$104

jue. 9/256:00 amDCA - STL

1 stop4h 59mDelta

Deal found 7/2

$109

lun. 9/16:00 pmDCA - STL

1 stop16h 11mFrontier

Deal found 7/2

$119

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mar. 8/19

8:00 am-9:10 am

Nonstop2h 10m

Lambert-St Louis

jue. 8/21

9:50 am-2:55 pm

1 stop4h 05m

$203

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

jue. 8/14

1:00 pm-9:11 am

1 stop21h 11m

Lambert-St Louis

lun. 8/18

7:29 pm-4:59 pm

1 stop20h 30m

$207

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

mar. 8/12

6:00 pm-10:45 pm

1 stop5h 45m

Lambert-St Louis

mar. 8/19

5:30 pm-10:43 pm

1 stop4h 13m

$217

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

jue. 9/25

11:31 am-12:51 pm

Nonstop2h 20m

Lambert-St Louis

lun. 9/29

6:05 am-2:24 pm

1 stop7h 19m

$220

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

sáb. 8/16

8:59 am-2:28 pm

1 stop6h 29m

Lambert-St Louis

mar. 8/19

6:40 am-11:34 am

1 stop3h 54m

$231

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

jue. 9/25

2:56 pm-4:15 pm

Nonstop2h 19m

$99

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

dom. 8/31

10:30 am-3:44 pm

1 stop6h 14m

$100

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

lun. 9/22

3:40 pm-6:45 pm

1 stop4h 05m

$104

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

jue. 9/25

6:00 am-9:59 am

1 stop4h 59m

$109

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

lun. 9/1

6:00 pm-9:11 am

1 stop16h 11m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

The best insider tips for Washington, D.C. Reagan-National Airport to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Reagan-National Airport to St. Louis trip

Airports

DCA

For a stress-free departure, reserve parking online at DCA as lots fill up quickly, especially during busy times.

STL

Use the MetroLink light rail for an economical and convenient ride from STL to downtown St. Louis, taking about 40 minutes.

Our travel experts

Emily Zemler

Expert on DCA

Taryn White

Expert on STL

Best time to book a flight from Reagan-National to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Reagan-National with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

The best time to book flights from Washington, D.C. Reagan-National Airport to St. Louis is 74 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $311). Flying from Washington, D.C. Reagan-National Airport 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 time of day to fly from DCA to STL?

It’s optimal to fly from Washington, D.C. Reagan-National Airport to St. Louis in the evening. By choosing this option you can save up to 16% on the cost of your flight, compared to a flight in the afternoon.

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

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

Weekly flight availability from Washington, D.C. Reagan-National Airport to St. Louis

The most flights from DCA to STL are scheduled on a Monday (8 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (1 on average).

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from Washington, D.C. Reagan-National Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,272 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,975 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

United Airlines

7.4

Good

8,861 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Frontier

5.9

Fair

3,286 reviews

Southwest

8.0

Very good

4,272 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

What airport do you fly into for flights to St. Louis from Washington, D.C. Reagan-National?
Lambert-St Louis (STL) is the airport you will fly into if you book a flight from Washington, D.C. Reagan-National to St. Louis. You should not have trouble finding flights to Lambert-St Louis from Washington, D.C. Reagan-National; the airport handles an average of 4 inbound flights from Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 3 airlines have flights to the St. Louis airport from Washington, D.C. Reagan-National. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.
What are the cheapest airlines flying from Washington, D.C. Reagan-National Airport to St. Louis round-trip?
According to our current data, Southwest ($203), Frontier ($207), and United Airlines ($217) offers the cheapest pricing from Washington, D.C. Reagan-National Airport to St. Louis. Southwest is 38% cheaper than the average price of flights available within the next 90 days to this destination.
What are the cheapest airlines to fly from Washington, D.C. Reagan-National Airport to St. Louis one-way?
To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $99. United Airlines flights start at $100 while deals on Southwest start at $104 one-way.
What are the most reliable airlines from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to St. Louis on time: Southwest (76%), American Airlines (67%), PSA Airlines (57%).
What are the cheapest flights from Washington, D.C. Reagan-National Airport to St. Louis?
Looking at all options, your cheapest flight can be booked for $89. While the most popular route (Washington, D.C. Reagan-National - Lambert-St Louis) can be booked for $197 on average our data indicates $255 when flying from Washington, D.C. Reagan-National Airport to St. Louis.
Can I find deals for flights from Reagan-National to St. Louis that include hotel bookings?
Yes. In addition to deals on Reagan-National to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Reagan-National to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Reagan-National to St. Louis.
Can I find deals for business class flights from Reagan-National to St. Louis?
Yes. Cheapflights offers flight deals from Reagan-National 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.
What is the cheapest month to book a flight from Washington, D.C. Reagan-National Airport to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $311). Flying from Washington, D.C. Reagan-National Airport 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.

See more FAQs

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Alternative routes for Reagan-National to St. Louis

Top 3 airlines flying from Reagan-National to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$198	Average$318	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$198	Average$346	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$223	Average$323	FlexibilityNo cancel fee	On-timeN/A

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$99+ Cheap flights from Reagan-National (DCA) 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Reagan-National to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Washington, D.C. Reagan-National to Lambert-St Louis are usually found in February or July, booked 74 days in advance, depart on a Wednesday or Friday and return on a Saturday

Cheap flight deals from Reagan-National to St. Louis

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Reagan-National to St. Louis

Cheapest flights from Reagan-National to St. LouisExplore the most affordable flight options available from Reagan-National to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 2, 2025.

Explore the most affordable flight options available from Reagan-National to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 2, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to St. Louis that are best for you.

The best insider tips for Washington, D.C. Reagan-National Airport to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Reagan-National Airport to St. Louis trip

Airports

DCA

STL

Our travel experts

Best time to book a flight from Reagan-National to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Reagan-National with our price prediction graph.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from Reagan-National to St. Louis. Price data was last updated on June 27, 2025.

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

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

Find hourly flight availability from Reagan-National 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 julio 2, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Reagan-National to St. Louis. Price data was last updated on June 29, 2025.

Weekly flight availability from Washington, D.C. Reagan-National Airport to St. Louis

Reviews of airlines servicing St. Louis

Related info for your journey

Find useful and relevant information for your journey from Reagan-National 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. Reagan-National?

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

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

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

What are the cheapest flights from Washington, D.C. Reagan-National Airport to St. Louis?

Can I find deals for flights from Reagan-National to St. Louis that include hotel bookings?

How can I find direct flights from Reagan-National to St. Louis?

Can I find deals for business class flights from Reagan-National to St. Louis?

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

Traveling to a place near Washington, D.C. Reagan-National Airport?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Reagan-National to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from Reagan-National to St. Louis

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Cheapest flights from Reagan-National to St. Louis
Explore the most affordable flight options available from Reagan-National to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 2, 2025.