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.
$84+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
STL — WAS
mar. 30 — abr. 61
1 adult, Economy
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Find cheap flights from St. Louis to Washington, D.C. with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Lambert-St Louis to Washington, D.C. are usually found in November or August, booked 63 days in advance, depart on a Friday or Thursday and return on a Wednesday
Cheap flight deals from St. Louis to Washington, D.C.
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Washington, D.C. (WAS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated marzo 25, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $177 (Southwest) |
One-way from | $84 (Mytrip) |
Popular in | March |
Cheapest in | November |
Average price | $371 |
Good round-trip deal | $253 or less |
Good one-way deal | $123 or less |
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 marzo 25, 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 marzo 25, 2025.
This Southwest deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/19:10 pmSTL - BWI
Nonstop2h 00mSouthwest
lun. 5/512:40 pmBWI - STL
Nonstop2h 15mSouthwest
Deal found 3/24![Southwest logo]()
$177
This American Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/29:56 amSTL - DCA
Nonstop2h 03mAmerican Airlines
mié. 7/93:13 pmDCA - STL
Nonstop2h 21mAmerican Airlines
Deal found 3/23![American Airlines logo]()
$204
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/123:45 pmSTL - DCA
1 stop3h 45mSouthwest
lun. 4/146:55 pmDCA - STL
Nonstop2h 15mSouthwest
Deal found 3/22![Southwest logo]()
$207
This United Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/261:12 pmSTL - IAD
1 stop5h 05mUnited Airlines
mar. 4/298:35 amIAD - STL
Nonstop2h 23mUnited Airlines
Deal found 3/24![United Airlines logo]()
$207
This Mytrip deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/276:10 pmSTL - BWI
1 stop14h 12mSpirit Airlines
mié. 4/307:55 pmBWI - STL
1 stop22h 20mSpirit Airlines
Deal found 3/24![Spirit Airlines logo]()
$208
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/145:37 pmSTL - BWI
1 stop4h 45mDelta
vie. 4/182:04 pmBWI - STL
1 stop4h 52mDelta
Deal found 3/25![Delta logo]()
$217
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/145:37 pmSTL - IAD
1 stop4h 30mDelta
vie. 4/1812:29 pmIAD - STL
1 stop4h 57mDelta
Deal found 3/25![Delta logo]()
$217
This American Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/85:00 amSTL - BWI
1 stop3h 59mAmerican Airlines
jue. 5/155:00 amBWI - STL
1 stop4h 56mAmerican Airlines
Deal found 3/24![American Airlines logo]()
$228
This Delta deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/212:55 pmSTL - DCA
1 stop4h 47mDelta
dom. 5/116:00 amDCA - STL
1 stop4h 00mDelta
Deal found 3/24![Delta logo]()
$243
This Booking.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/54:57 pmSTL - IAD
1 stop16h 58mFrontier
mar. 4/85:54 pmIAD - STL
1 stop6h 52mFrontier
Deal found 3/24![Frontier logo]()
$248
This Mytrip deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/126:45 pmSTL - IAD
1 stop15h 05mMultiple Airlines
mié. 4/165:52 pmIAD - STL
1 stop6h 54mMultiple Airlines
Deal found 3/24![Multiple Airlines logo]()
$257
This Booking.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/124:57 pmSTL - BWI
1 stop13h 28mFrontier
dom. 4/139:56 pmBWI - STL
1 stop26h 50mFrontier
Deal found 3/24![Frontier logo]()
$258
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Washington, D.C. that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated marzo 25, 2025.
Use the filters below to find and compare flights from St. Louis to Washington, D.C. that are best for you.
Fly from
St. Louis
Fly to
Washington, D.C.
Route
Depart
Return
Price
St. LouisBaltimore
STL - BWI
STLBWI
Lambert-St Louis
jue. 5/1
9:10 pm-12:10 am
Nonstop2h 00m
Baltimore/Washington
lun. 5/5
12:40 pm-1:55 pm
Nonstop2h 15m
$177
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
sáb. 4/26
1:12 pm-7:17 pm
1 stop5h 05m
Washington, D.C. Dulles Intl
mar. 4/29
8:35 am-9:58 am
Nonstop2h 23m
$207
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
sáb. 4/12
3:45 pm-8:30 pm
1 stop3h 45m
Washington, D.C. Reagan-National
lun. 4/14
6:55 pm-8:10 pm
Nonstop2h 15m
$207
St. LouisBaltimore
STL - BWI
STLBWI
Lambert-St Louis
dom. 4/27
6:10 pm-9:22 am
1 stop14h 12m
Baltimore/Washington
mié. 4/30
7:55 pm-5:15 pm
1 stop22h 20m
$208
St. LouisBaltimore
STL - BWI
STLBWI
Lambert-St Louis
lun. 4/14
5:37 pm-11:22 pm
1 stop4h 45m
Baltimore/Washington
vie. 4/18
2:04 pm-5:56 pm
1 stop4h 52m
$217
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
lun. 4/14
5:37 pm-11:07 pm
1 stop4h 30m
Washington, D.C. Dulles Intl
vie. 4/18
12:29 pm-4:26 pm
1 stop4h 57m
$217
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
mié. 4/23
7:35 am-4:19 pm
1 stop7h 44m
Washington, D.C. Reagan-National
jue. 4/24
8:22 am-9:52 am
Nonstop2h 30m
$220
St. LouisBaltimore
STL - BWI
STLBWI
Lambert-St Louis
jue. 5/8
5:00 am-9:59 am
1 stop3h 59m
Baltimore/Washington
jue. 5/15
5:00 am-8:56 am
1 stop4h 56m
$228
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
vie. 5/2
12:55 pm-6:42 pm
1 stop4h 47m
Washington, D.C. Reagan-National
dom. 5/11
6:00 am-9:00 am
1 stop4h 00m
$243
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
sáb. 4/5
4:57 pm-10:55 am
1 stop16h 58m
Washington, D.C. Dulles Intl
mar. 4/8
5:54 pm-11:46 pm
1 stop6h 52m
$248
Showing 1-10 of 36 results
Compare providers for flights from St. Louis to Washington, D.C.
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Washington, D.C. in March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Washington, D.C. flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
The best insider tips for St. Louis to Washington, D.C. flights
Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Washington, D.C. trip
Airlines
![Southwest]()
Southwest
![United Airlines]()
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.
Airports
Our travel experts
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.?
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 March 21, 2025.
Booking 63 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 $309). Flying from St. Louis to Washington, D.C. in June is currently the most expensive (average of $387). 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?
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 marzo 25, 2025.
It’s typically best to fly out from St. Louis to Washington, D.C. in the evening. Doing so could potentially save you 73% 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.?
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 March 23, 2025.
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.
Explore weekly flight availability from St. Louis to Washington, D.C.. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated marzo 25, 2025.
The most flights from STL to WAS are scheduled on a Monday (12 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (1 on average).
Rainfall in Washington, D.C. by month
Plan your trip to Washington, D.C. by taking into account the average rainfall totals 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
Plan your trip to Washington, D.C. by taking into account the average temperature totals 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.
Get insights into the airlines that provide service to Washington, D.C.. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington, D.C.. Reviews last updated marzo 25, 2025.
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.
Boarding
8.2
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.6
Food
7.1
Reviews
1 / 20
8.0
ExcellentIla,Mar 2025
HOU - DAL
Boarding
8.2
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.6
Food
7.1
Reviews
1 / 20
8.0
ExcellentIla,Mar 2025
HOU - DAL
Boarding
8.2
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.6
Food
7.1
Reviews
1 / 20
8.0
ExcellentIla,Mar 2025
HOU - DAL
Boarding
8.2
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.6
Food
7.1
Reviews
1 / 20
8.0
ExcellentIla,Mar 2025
HOU - DAL
Boarding
8.2
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.6
Food
7.1
Reviews
1 / 20
8.0
ExcellentIla,Mar 2025
HOU - DAL
Boarding
8.2
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.6
Food
7.1
Reviews
1 / 20
8.0
ExcellentIla,Mar 2025
HOU - DAL
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsArlington
Alexandria
Fairfax
Tysons
Springfield
Rockville
Woodbridge
Gaithersburg
Fredericksburg
Linthicum Heights
Silver Spring
Falls Church
Laurel
Easton
Herndon
Bowie
Gettysburg
National Harbor
Oxon Hill
Reston
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Alternative routes for St. Louis to Washington, D.C.
See prices for flight routes from nearby airports that may be better suited for you.
Top 5 airlines flying from St. Louis to Washington, D.C.
Discover the top 5 airlines that operate flights from St. Louis to Washington, D.C.. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated marzo 25, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$163 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$129 | Average$323 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$186 | Average$310 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$197 | Average$343 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$211 | Average$379 | FlexibilityNo cancel fee | On-time69% |