How popular is this St. Louis to Washington, D.C. flight route?

This flight path from Lambert-St Louis to Washington, D.C. was viewed by 24 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

Flying on Spirit Airlines is currently your cheapest option to Washington, D.C., with prices starting at $140. Additional round-trip tickets that might be worth considering are offered by Southwest and Delta, with the lowest prices starting at $197 and $208, respectively. Spirit Airlines is 53% cheaper than the average price of flights available within the next 90 days to this destination.

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

For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $70. Users have also found prices from $99 and $109 on Southwest and American Airlines, respectively.

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

The most popular route from St. Louis to Washington, D.C. is Lambert-St Louis - Washington, D.C. Dulles Intl. You may also consider Lambert-St Louis - Baltimore/Washington or Lambert-St Louis - Washington, D.C. Reagan-National.

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

While on average a flight from St. Louis to Washington, D.C. is generally $353, our data shows the cheapest flight currently is $147. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $177 for that flight.

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

American Airlines, Delta and Frontier are the most popular airlines when flying from St. Louis to Washington, D.C..

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

Flights from St. Louis to Washington, D.C. are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Washington, D.C..

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

Travelers have found it’s best to book a flight 44 days in advance to save up to 203% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 44 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to Washington, D.C. 1-2 weeks in advance for as low as $425, or $567 for flights within the next 24 hours.

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

Due to multiple factors, expect to potentially pay more when booking in March. For low rates, November can be a great choice for travel to Washington, D.C.. Flights to Washington, D.C. from St. Louis in November are about $298 on average during November, but can be found for as low as $133.

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

If you book a flight to Washington, D.C. from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 12 flights from Lambert-St Louis to Washington, D.C. per day from 5 different airlines.

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

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

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

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

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

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

$70+ Flights from St. Louis to Washington, D.C.

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Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. are usually found in November or August, booked 43 days in advance, depart on a Friday or Thursday and return on a Wednesday

Cheap flight deals from St. Louis to Washington, D.C.

Round-trip from	$140 (Mytrip)
One-way from	$70 (Mytrip)
Popular in	March
Cheapest in	November
Average price	$273
Good round-trip deal	$240 or less
Good one-way deal	$138 or less

From Lambert-St Louis to Washington, D.C. (WAS)

Search Deals

One-way flight from Lambert-St Louis to Washington, D.C. (WAS)

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($31 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).

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Average for round-trip flights in June 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to Washington, D.C. (WAS).

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Price to beat on a one-way flight from Lambert-St Louis to Washington, D.C. (WAS).

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Find flight deals from St. Louis to Washington, D.C.

Cheapest flights from St. Louis to Washington, D.C.
Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on junio 12, 2025.

dom. 7/66:36 pmSTL - BWI

1 stop11h 28mSpirit Airlines

sáb. 7/2610:11 pmBWI - STL

1 stop12h 41mSpirit Airlines

Deal found 6/11

$140

mié. 11/196:05 amSTL - BWI

Nonstop2h 00mSouthwest

mié. 12/38:40 pmBWI - STL

Nonstop2h 20mSouthwest

Deal found 6/10

$197

vie. 7/46:00 amSTL - DCA

Nonstop2h 05mAmerican Airlines

sáb. 7/122:58 pmDCA - STL

Nonstop2h 19mAmerican Airlines

Deal found 6/11

$204

jue. 7/316:10 amSTL - DCA

2 stops5h 25mSouthwest

lun. 8/48:00 amDCA - STL

Nonstop2h 10mSouthwest

Deal found 6/10

$208

mié. 11/57:20 amSTL - IAD

1 stop5h 37mDelta

sáb. 11/86:10 amIAD - STL

1 stop4h 25mDelta

Deal found 6/10

$208

vie. 8/15:30 pmSTL - DCA

1 stop4h 12mUnited Airlines

jue. 8/77:25 amDCA - STL

1 stop6h 02mUnited Airlines

Deal found 6/11

$213

mié. 9/249:17 amSTL - IAD

1 stop5h 35mUnited Airlines

vie. 9/266:30 amIAD - STL

1 stop5h 19mUnited Airlines

Deal found 6/12

$213

mié. 9/249:57 amSTL - BWI

1 stop6h 44mAmerican Airlines

lun. 9/296:14 amBWI - STL

1 stop4h 02mAmerican Airlines

Deal found 6/11

$217

sáb. 7/511:00 amSTL - BWI

1 stop4h 54mFrontier

sáb. 7/127:20 amBWI - STL

1 stop7h 39mFrontier

Deal found 6/11

$221

vie. 10/35:40 pmSTL - DCA

1 stop4h 39mDelta

mar. 10/77:00 amDCA - STL

1 stop6h 25mDelta

Deal found 6/11

$223

sáb. 7/122:52 pmSTL - IAD

1 stop7h 27mFrontier

sáb. 7/196:10 amIAD - STL

1 stop8h 49mFrontier

Deal found 6/11

$226

sáb. 6/282:52 pmSTL - BWI

1 stop8h 02mMultiple Airlines

dom. 6/292:08 pmBWI - STL

1 stop3h 56mMultiple Airlines

Deal found 6/9

$236

Best flights from St. Louis to Washington, D.C.
Discover carefully curated flight deals from St. Louis to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated junio 12, 2025.

dom. 7/66:36 pmSTL - BWI

1 stop11h 28mSpirit Airlines

sáb. 7/2610:11 pmBWI - STL

1 stop12h 41mSpirit Airlines

Deal found 6/11

$140

mié. 9/109:45 amSTL - BWI

Nonstop2h 00mSouthwest

mié. 9/248:40 pmBWI - STL

Nonstop2h 15mSouthwest

Deal found 6/10

$197

sáb. 8/167:00 amSTL - IAD

1 stop6h 31mDelta

jue. 8/216:00 amIAD - STL

1 stop4h 57mDelta

Deal found 6/11

$208

vie. 8/15:30 pmSTL - DCA

1 stop4h 12mUnited Airlines

jue. 8/77:25 amDCA - STL

1 stop6h 02mUnited Airlines

Deal found 6/11

$213

sáb. 8/306:02 amSTL - DCA

Nonstop2h 01mAmerican Airlines

lun. 9/17:51 pmDCA - STL

Nonstop2h 11mAmerican Airlines

Deal found 6/10

$214

sáb. 7/511:00 amSTL - BWI

1 stop4h 54mFrontier

sáb. 7/127:20 amBWI - STL

1 stop7h 39mFrontier

Deal found 6/11

$221

sáb. 6/282:52 pmSTL - BWI

1 stop8h 02mMultiple Airlines

dom. 6/292:08 pmBWI - STL

1 stop3h 56mMultiple Airlines

Deal found 6/9

$236

lun. 6/307:20 pmSTL - DCA

Nonstop2h 00mSouthwest

jue. 7/312:00 pmDCA - STL

Nonstop2h 10mSouthwest

Deal found 6/12

$204

mié. 9/249:17 amSTL - IAD

1 stop5h 35mUnited Airlines

vie. 9/266:30 amIAD - STL

1 stop5h 19mUnited Airlines

Deal found 6/12

$213

sáb. 7/122:52 pmSTL - IAD

1 stop7h 27mFrontier

sáb. 7/196:10 amIAD - STL

1 stop8h 49mFrontier

Deal found 6/11

$226

sáb. 8/161:01 pmSTL - BWI

1 stop4h 29mAmerican Airlines

jue. 8/217:45 pmBWI - STL

1 stop5h 10mAmerican Airlines

Deal found 6/11

$229

jue. 8/215:11 pmSTL - DCA

1 stop5h 35mDelta

dom. 8/246:00 amDCA - STL

1 stop4h 32mDelta

Deal found 6/10

$233

Last-minute flights from St. Louis to Washington, D.C.
Discover last-minute flight deals from St. Louis to Washington, D.C.. Data last updated junio 12, 2025 and is based on user searches.

jue. 6/196:36 pmSTL - BWI

1 stop11h 28mSpirit Airlines

dom. 6/292:08 pmBWI - STL

1 stop3h 56mSpirit Airlines

Deal found 6/10

$260

jue. 6/198:44 pmSTL - IAD

1 stop12h 25mFrontier

sáb. 6/216:10 amIAD - STL

1 stop8h 57mFrontier

Deal found 6/11

$304

jue. 6/192:36 pmSTL - BWI

1 stop8h 50mFrontier

sáb. 6/217:20 amBWI - STL

1 stop7h 47mFrontier

Deal found 6/11

$320

jue. 6/195:47 pmSTL - DCA

Nonstop2h 01mAmerican Airlines

jue. 6/268:00 amDCA - STL

Nonstop2h 26mAmerican Airlines

Deal found 6/12

$449

jue. 6/198:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

jue. 6/266:35 amIAD - STL

1 stop6h 52mUnited Airlines

Deal found 6/12

$459

jue. 6/1911:20 amSTL - DCA

1 stop5h 42mUnited Airlines

jue. 6/2612:00 pmDCA - STL

1 stop4h 47mUnited Airlines

Deal found 6/12

$469

jue. 6/194:37 pmSTL - IAD

1 stop6h 22mAmerican Airlines

mar. 6/248:14 pmIAD - STL

1 stop4h 45mAmerican Airlines

Deal found 6/9

$469

jue. 6/198:20 pmSTL - BWI

Nonstop1h 55mSouthwest

mar. 6/249:40 pmBWI - STL

Nonstop2h 15mSouthwest

Deal found 6/9

$491

jue. 6/199:30 amSTL - IAD

2 stops8h 35mSouthwest

mar. 6/247:25 amIAD - STL

1 stop7h 40mSouthwest

Deal found 6/9

$509

vie. 6/207:29 pmSTL - DCA

1 stop15h 31mFrontier

dom. 6/221:00 pmDCA - STL

1 stop21h 12mFrontier

Deal found 6/10

$365

dom. 6/226:36 pmSTL - BWI

1 stop11h 28mMultiple Airlines

mar. 6/248:25 amBWI - STL

3 stops33h 20mMultiple Airlines

Deal found 6/10

$397

dom. 6/228:35 pmSTL - DCA

Nonstop2h 00mSouthwest

vie. 6/273:35 pmDCA - STL

Nonstop2h 15mSouthwest

Deal found 6/11

$518

One-way flights from St. Louis to Washington, D.C.
Search for one-way flight options from St. Louis to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated junio 12, 2025.

dom. 7/2010:47 amSTL - BWI

1 stop19h 52mSpirit Airlines

Deal found 6/11

$70

lun. 8/259:05 amSTL - BWI

Nonstop2h 00mSouthwest

Deal found 6/10

$99

lun. 8/253:53 pmSTL - BWI

1 stop5h 02mAmerican Airlines

Deal found 6/11

$109

sáb. 7/126:00 amSTL - DCA

Nonstop2h 10mAmerican Airlines

Deal found 6/10

$115

mar. 7/298:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 6/10

$115

sáb. 8/238:35 amSTL - DCA

2 stops9h 55mSouthwest

Deal found 6/10

$120

sáb. 8/235:25 pmSTL - BWI

1 stop4h 52mDelta

Deal found 6/10

$121

lun. 9/16:00 amSTL - DCA

1 stop7h 22mUnited Airlines

Deal found 6/10

$124

lun. 7/145:23 pmSTL - DCA

1 stop4h 19mDelta

Deal found 6/9

$135

jue. 6/198:44 pmSTL - IAD

1 stop12h 25mFrontier

Deal found 6/12

$135

mar. 7/85:40 pmSTL - BWI

1 stop16h 18mFrontier

Deal found 6/10

$138

sáb. 7/127:29 pmSTL - DCA

1 stop15h 35mFrontier

Deal found 6/10

$141

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

dom. 7/6

6:36 pm-7:04 am

1 stop11h 28m

Baltimore/Washington

sáb. 7/26

10:11 pm-9:52 am

1 stop12h 41m

$140

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

mié. 9/10

9:45 am-12:45 pm

Nonstop2h 00m

Baltimore/Washington

mié. 9/24

8:40 pm-9:55 pm

Nonstop2h 15m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

lun. 6/30

7:20 pm-10:20 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

jue. 7/3

12:00 pm-1:10 pm

Nonstop2h 10m

$204

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

mié. 11/5

7:20 am-1:57 pm

1 stop5h 37m

Washington, D.C. Dulles Intl

sáb. 11/8

6:10 am-9:35 am

1 stop4h 25m

$208

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

vie. 8/1

5:30 pm-10:42 pm

1 stop4h 12m

Washington, D.C. Reagan-National

jue. 8/7

7:25 am-12:27 pm

1 stop6h 02m

$213

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

mié. 9/24

9:17 am-3:52 pm

1 stop5h 35m

Washington, D.C. Dulles Intl

vie. 9/26

6:30 am-10:49 am

1 stop5h 19m

$213

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

sáb. 8/30

6:02 am-9:03 am

Nonstop2h 01m

Washington, D.C. Reagan-National

lun. 9/1

7:51 pm-9:02 pm

Nonstop2h 11m

$214

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

sáb. 7/5

11:00 am-4:54 pm

1 stop4h 54m

Baltimore/Washington

sáb. 7/12

7:20 am-1:59 pm

1 stop7h 39m

$221

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

sáb. 7/12

2:52 pm-11:19 pm

1 stop7h 27m

Washington, D.C. Dulles Intl

sáb. 7/19

6:10 am-1:59 pm

1 stop8h 49m

$226

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

sáb. 8/16

1:01 pm-6:30 pm

1 stop4h 29m

Baltimore/Washington

jue. 8/21

7:45 pm-11:55 pm

1 stop5h 10m

$229

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 35 results

The best insider tips for St. Louis to Washington, D.C. flights

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

Airlines

Southwest

Enjoy free snacks and non-alcoholic drinks, plus Wi-Fi for a fee on board.

Two free checked bags included, even oversized like skis or golf clubs.

Read more about Southwestby Marisa Garcia

United Airlines

Basic Economy allows a personal item only; no carry-on bags permitted.

Economy Plus offers extra legroom seats towards the front of the cabin.

Read more about United Airlinesby Harriet Baskas

Airports

STL

Security lines at STL are generally quick, averaging 5 to 10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

DCA

DCA is easily accessible via the Metro, with a dedicated stop on the Yellow and Blue lines. It's the most affordable option for reaching downtown D.C.

IAD

The Silver Line Metro now reaches IAD in under 40 minutes, making it a cost-effective way to travel to and from the airport.

Our travel experts

Marisa Garcia

Expert on Southwest

Harriet Baskas

Expert on United Airlines

Emily Zemler

Expert on DCA

Taryn White

Expert on STL

Ramsey Qubein

Expert on IAD

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

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

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

Booking 43 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Washington, D.C.. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $241). Flying from St. Louis to Washington, D.C. in March is currently the most expensive (average of $290). 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 STL to WAS?

It’s typically best to fly out from St. Louis to Washington, D.C. in the evening. Doing so could potentially save you 72% on the flight price compared to flying at noon, which is usually more expensive.

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

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

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

The most flights from STL to WAS are scheduled on a Monday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in Washington, D.C. by month

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

Temperature in Washington, D.C. by month

If weather is an important factor for your trip to Washington, D.C., 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 35.6 F).

Reviews of airlines servicing Washington, D.C.

Peruse reviews from past customers who have flown with Southwest, Delta and United Airlines from St. Louis to Washington, D.C. 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

4,287 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

4,287 reviews

Southwest

8.0

Very good

4,287 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

7,950 reviews

Southwest

8.0

Very good

4,287 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

8,790 reviews

Southwest

8.0

Very good

4,287 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

4,287 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.

Sun Country Air

6.9

Okay

345 reviews

Southwest

8.0

Very good

4,287 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 from for flights from St. Louis to Washington, D.C.?
If you book a flight to Washington, D.C. from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 12 flights from Lambert-St Louis to Washington, D.C. per day from 5 different airlines.
How popular is this St. Louis to Washington, D.C. flight route?
This flight path from Lambert-St Louis to Washington, D.C. was viewed by 24 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
What are the cheapest airlines flying from St. Louis to Washington, D.C. round-trip?
Flying on Spirit Airlines is currently your cheapest option to Washington, D.C., with prices starting at $140. Additional round-trip tickets that might be worth considering are offered by Southwest and Delta, with the lowest prices starting at $197 and $208, respectively. Spirit Airlines is 53% cheaper than the average price of flights available within the next 90 days to this destination.
What are the cheapest airlines to fly from St. Louis to Washington, D.C. one-way?
For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $70. Users have also found prices from $99 and $109 on Southwest and American Airlines, respectively.
What are the most popular routes from St. Louis to Washington, D.C.?
The most popular route from St. Louis to Washington, D.C. is Lambert-St Louis - Washington, D.C. Dulles Intl. You may also consider Lambert-St Louis - Baltimore/Washington or Lambert-St Louis - Washington, D.C. Reagan-National.
What are the cheapest flights from St. Louis to Washington, D.C.?
While on average a flight from St. Louis to Washington, D.C. is generally $353, our data shows the cheapest flight currently is $147. When looking at the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl), you can expect to pay $177 for that flight.
Can I find deals for flights from St. Louis to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on St. Louis to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Washington, D.C..
Can I find deals for business class flights from St. Louis to Washington, D.C.?
Yes. Cheapflights offers flight deals from St. Louis to Washington, D.C. 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 St. Louis to Washington, D.C.?
Currently, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. (average of $241). Flying from St. Louis to Washington, D.C. in March is currently the most expensive (average of $290). 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

Arlington

Alexandria

Woodbridge

Tysons

Silver Spring

Linthicum Heights

Fredericksburg

Gaithersburg

Fairfax

Falls Church

Easton

Herndon

Towson

Bowie

Rockville

Reston

National Harbor

Springfield

Manassas

Dundalk

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Top 5 airlines flying from St. Louis to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$120	Average$217	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$129	Average$328	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$176	Average$276	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$197	Average$332	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$209	Average$392	FlexibilityNo cancel fee	On-time69%

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$70+ Cheap flights from St. Louis (STL) to Washington, D.C. (WAS)

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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. are usually found in November or August, booked 43 days in advance, depart on a Friday or Thursday and return on a Wednesday

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Cheapest flights from St. Louis to Washington, D.C.Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on junio 12, 2025.

Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on junio 12, 2025.

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

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Washington, D.C.. Price data was last updated on June 9, 2025.

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

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

Find hourly flight availability from St. Louis to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated junio 12, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Washington, D.C.. Price data was last updated on June 8, 2025.

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

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

Reviews of airlines servicing Washington, D.C.

Peruse reviews from past customers who have flown with Southwest, Delta and United Airlines from St. Louis to Washington, D.C. 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.

Related info for your journey

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

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

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

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Top 5 airlines flying from St. Louis to Washington, D.C.

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Cheapest flights from St. Louis to Washington, D.C.
Explore the most affordable flight options available from St. Louis to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on junio 12, 2025.