$102+ Cheap flights from St. Louis (STL) to Reagan-National (DCA)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DCA
Oct 20 — Oct 271
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Reagan-National 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. Reagan-National are usually found in December or October, booked 60 days in advance, depart on a Saturday or Thursday and return on a Wednesday
Cheap flight deals from St. Louis to Reagan-National
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to Reagan-NationalExplore the most affordable flight options available from St. Louis to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 20, 2026.
Explore the most affordable flight options available from St. Louis to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 20, 2026.
This CheapOair deal was found by Cheapflights users on 9/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/58:10 pm -
1 stop24h 49m
Wed 10/77:00 am -
1 stop17h 59m
Deal found 9/17![Frontier logo]()
$241
This Southwest deal was found by Cheapflights users on 9/16. 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.
Sat 10/313:40 pm -
Nonstop2h 00m
Mon 11/22:40 pm -
Nonstop2h 25m
Deal found 9/16![Southwest logo]()
$243
This CheapOair deal was found by Cheapflights users on 9/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/168:00 pm -
1 stop24h 59m
Tue 10/206:00 pm -
1 stop22h 24m
Deal found 9/19![Frontier logo]()
$244
This American Airlines deal was found by Cheapflights users on 9/18. 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.
Mon 11/27:00 am -
Nonstop2h 08m
Mon 11/96:00 am -
1 stop5h 53m
Deal found 9/18![American Airlines logo]()
$246
This Southwest deal was found by Cheapflights users on 9/19. 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.
Sat 10/1012:55 pm -
1 stop4h 40m
Tue 10/136:40 pm -
Nonstop2h 30m
Deal found 9/19![Southwest logo]()
$247
This Southwest deal was found by Cheapflights users on 9/17. 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.
Sat 10/178:20 am -
Nonstop2h 00m
Mon 10/198:00 am -
Nonstop2h 25m
Deal found 9/17![Southwest logo]()
$248
This Southwest deal was found by Cheapflights users on 9/15. 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.
Wed 10/1410:20 am -
1 stop3h 10m
Thu 10/158:00 am -
Nonstop2h 25m
Deal found 9/15![Southwest logo]()
$249
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 10/178:00 am -
1 stop7h 20m
Sat 10/247:00 am -
1 stop4h 51m
Deal found 9/15![Delta logo]()
$251
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 10/1712:49 pm -
1 stop4h 38m
Mon 10/192:25 pm -
Nonstop2h 32m
Deal found 9/15![American Airlines logo]()
$252
This Southwest deal was found by Cheapflights users on 9/16. 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.
Wed 10/2810:20 am -
1 stop3h 10m
Mon 11/26:55 pm -
Nonstop2h 30m
Deal found 9/16![Southwest logo]()
$254
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/155:08 pm -
Nonstop2h 10m
Thu 10/228:26 am -
Nonstop2h 52m
Deal found 9/15![American Airlines logo]()
$255
Best flights from St. Louis to Reagan-NationalDiscover carefully curated flight deals from St. Louis to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 20, 2026.
Discover carefully curated flight deals from St. Louis to Reagan-National that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 20, 2026.
This Delta deal was found by Cheapflights users on 9/15. 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.
Tue 10/206:47 am -
1 stop3h 45m
Tue 10/204:00 pm -
1 stop6h 23m
Deal found 9/15![Delta logo]()
$251
This Southwest deal was found by Cheapflights users on 9/16. 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.
Sat 10/318:00 am -
1 stop6h 15m
Mon 11/212:00 pm -
2 stops8h 10m
Deal found 9/16![Southwest logo]()
$268
This United Airlines deal was found by Cheapflights users on 9/19. 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.
Thu 12/176:03 am -
1 stop5h 27m
Sun 12/206:30 am -
1 stop5h 12m
Deal found 9/19![United Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 10/178:00 am -
1 stop7h 20m
Tue 10/207:59 am -
1 stop6h 21m
Deal found 9/15![Delta logo]()
$251
This Southwest deal was found by Cheapflights users on 9/16. 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.
Wed 10/2810:20 am -
1 stop3h 10m
Mon 11/212:00 pm -
2 stops8h 10m
Deal found 9/16![Southwest logo]()
$269
This Delta deal was found by Cheapflights users on 9/19. 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.
Sat 10/104:22 pm -
1 stop5h 45m
Tue 10/137:59 am -
1 stop6h 21m
Deal found 9/19![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 9/15. 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.
Fri 10/307:50 pm -
Nonstop2h 05m
Mon 11/22:40 pm -
Nonstop2h 25m
Deal found 9/15![Southwest logo]()
$276
This Delta deal was found by Cheapflights users on 9/17. 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.
Sat 11/147:05 am -
1 stop4h 54m
Mon 11/167:40 pm -
1 stop5h 16m
Deal found 9/17![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 9/17. 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.
Sat 10/103:00 pm -
Nonstop2h 00m
Wed 10/146:05 am -
1 stop8h 00m
Deal found 9/17![Southwest logo]()
$281
This Southwest deal was found by Cheapflights users on 9/16. 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.
Sun 10/118:20 am -
Nonstop2h 00m
Sat 10/178:15 am -
Nonstop2h 25m
Deal found 9/16![Southwest logo]()
$309
This Southwest deal was found by Cheapflights users on 9/17. 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.
Tue 10/2710:20 am -
1 stop3h 10m
Sun 11/112:00 pm -
2 stops8h 10m
Deal found 9/17![Southwest logo]()
$330
This Southwest deal was found by Cheapflights users on 9/17. 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.
Fri 11/62:40 pm -
2 stops6h 05m
Sun 11/812:00 pm -
Nonstop2h 25m
Deal found 9/17![Southwest logo]()
$356
Last-minute flights from St. Louis to Reagan-NationalDiscover last-minute flight deals from St. Louis to Reagan-National. Data last updated September 20, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Reagan-National. Data last updated September 20, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 9/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/58:10 pm -
1 stop24h 49m
Wed 10/77:00 am -
1 stop17h 59m
Deal found 9/17![Frontier logo]()
$241
This Southwest deal was found by Cheapflights users on 9/19. 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.
Sat 10/1012:55 pm -
1 stop4h 40m
Tue 10/136:40 pm -
Nonstop2h 30m
Deal found 9/19![Southwest logo]()
$247
This Delta deal was found by Cheapflights users on 9/19. 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.
Sat 10/104:22 pm -
1 stop5h 45m
Tue 10/137:59 am -
1 stop6h 21m
Deal found 9/19![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 9/15. 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.
Wed 10/1410:20 am -
1 stop3h 10m
Thu 10/158:00 am -
Nonstop2h 25m
Deal found 9/15![Southwest logo]()
$249
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/155:08 pm -
Nonstop2h 10m
Thu 10/228:26 am -
Nonstop2h 52m
Deal found 9/15![American Airlines logo]()
$255
This CheapOair deal was found by Cheapflights users on 9/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/168:00 pm -
1 stop24h 59m
Tue 10/206:00 pm -
1 stop22h 24m
Deal found 9/19![Frontier logo]()
$244
This Southwest deal was found by Cheapflights users on 9/17. 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.
Sat 10/178:20 am -
Nonstop2h 00m
Mon 10/198:00 am -
Nonstop2h 25m
Deal found 9/17![Southwest logo]()
$248
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 10/178:00 am -
1 stop7h 20m
Sat 10/247:00 am -
1 stop4h 51m
Deal found 9/15![Delta logo]()
$251
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 10/1712:49 pm -
1 stop4h 38m
Mon 10/192:25 pm -
Nonstop2h 32m
Deal found 9/15![American Airlines logo]()
$252
This Southwest deal was found by Cheapflights users on 9/16. 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.
Wed 10/2810:20 am -
1 stop3h 10m
Mon 11/26:55 pm -
Nonstop2h 30m
Deal found 9/16![Southwest logo]()
$254
This Southwest deal was found by Cheapflights users on 9/16. 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.
Sat 10/313:40 pm -
Nonstop2h 00m
Mon 11/22:40 pm -
Nonstop2h 25m
Deal found 9/16![Southwest logo]()
$243
One-way flights from St. Louis to Reagan-NationalSearch for one-way flight options from St. Louis to Reagan-National. Find affordable one-way fares based on user searches. Data last updated September 20, 2026.
Search for one-way flight options from St. Louis to Reagan-National. Find affordable one-way fares based on user searches. Data last updated September 20, 2026.
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/284:18 pm -
1 stop18h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$102
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/147:59 pm -
1 stop15h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:35 pm -
2 stops26h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:44 pm -
2 stops21h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:35 pm -
2 stops21h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/306:44 pm -
2 stops21h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$114
This Southwest deal was found by Cheapflights users on 9/15. 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.
Tue 11/178:40 am -
Nonstop1h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Southwest logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:44 pm -
2 stops21h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$118
This Southwest deal was found by Cheapflights users on 9/18. 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.
Sat 10/103:00 pm -
Nonstop2h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Southwest logo]()
$119
Find flight deals from St. Louis to Reagan-National
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Reagan-National (DCA). 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 September 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $241 (American Airlines) |
One-way from | $102 (Expedia) |
Popular in | February |
Cheapest in | December |
Average price | $380 |
Good round-trip deal | $312 or less |
Good one-way deal | $162 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Reagan-National 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 7,457,451 searches. Data last updated September 20, 2026.
Use the filters below to find and compare flights from St. Louis to Washington, D.C. Reagan-National Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Tue 11/17
8:40 am-11:35 am
Nonstop1h 55m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$116
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Wed 10/14
8:05 am-11:00 am
Nonstop1h 55m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$119
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Wed 11/11
6:00 am-11:29 am
1 stop4h 29m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$126
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Sat 10/17
8:00 am-4:20 pm
1 stop7h 20m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$129
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Mon 10/19
5:35 pm-10:47 pm
1 stop4h 12m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$129
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Mon 11/16
1:02 pm-8:49 pm
1 stop6h 47m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$129
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Sat 11/14
5:45 am-1:55 pm
2 stops7h 10m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$131
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Tue 10/27
3:35 pm-11:55 pm
2 stops7h 20m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$131
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Mon 10/5
10:00 am-4:22 pm
1 stop5h 22m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$138
St. LouisWashington, D.C.
STL Lambert-St Louis - DCA Washington, D.C. Reagan-National
STLDCA
Lambert-St Louis
Thu 12/17
5:31 pm-10:42 pm
1 stop4h 11m
Washington, D.C. Reagan-National
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$138
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Reagan-National
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 Reagan-National in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Washington, D.C. Reagan-National Airport 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. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Washington, D.C. Reagan-National Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Washington, D.C. Reagan-National Airport 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. Reagan-National Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Reagan-National
Have a flexible travel schedule? Discover the best time to fly to Reagan-National from St. Louis with our price prediction graph.
STL-DCA
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. Reagan-National Airport
How far ahead should I book a flight from St. Louis to Washington, D.C. Reagan-National Airport?
The best time to book flights from St. Louis to Washington, D.C. Reagan-National Airport is 59 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 St. Louis to Washington, D.C. Reagan-National Airport?
Currently, December is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Reagan-National Airport (average of $322). Flying from St. Louis to Washington, D.C. Reagan-National Airport in February is currently the most expensive (average of $590). 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 DCA?
Find hourly flight availability from St. Louis to Reagan-National. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 20, 2026.
It’s optimal to fly from St. Louis to Washington, D.C. Reagan-National Airport at noon. By choosing this option you can save up to 8% on the cost of your flight, compared to a flight in the morning.
The best insider tips for St. Louis to Washington, D.C. Reagan-National Airport flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Washington, D.C. Reagan-National Airport trip
Our travel experts
Reviews of airlines servicing Reagan-National
Get insights into the airlines that provide service to Reagan-National. 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 Reagan-National. Reviews last updated September 20, 2026.
Get a feel of what it's like to fly with Southwest,JetBlue, andAmerican Airlines from St. Louis to Washington, D.C. Reagan-National Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodLauren,Dec 2024
MCI - DCA
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodLauren,Dec 2024
MCI - DCA
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodLauren,Dec 2024
MCI - DCA
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodLauren,Dec 2024
MCI - DCA
Overall
8.0
Entertainment
7.5
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodLauren,Dec 2024
MCI - DCA
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Reagan-National. 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 Washington, D.C. Reagan-National Airport?
Book flights to Washington, D.C. Reagan-National Airport if you plan to visit one of these locationsAlexandria
Arlington
Owings Mills
Lanham
Tysons
Woodbridge
Reston
Herndon
Hyattsville
Rockville
Fredericksburg
Falls Church
Hanover
Laurel
Springfield
Oxon Hill
Clinton
Hunt Valley
Silver Spring
Largo
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St. Louis and Reagan-National flights
Browse other St. Louis and Reagan-National flight options. Last updated on September 20, 2026.
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Other flights to Reagan-National
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Top 4 airlines flying from St. Louis to Reagan-National
Discover the top 4 airlines that operate flights from St. Louis to Reagan-National. 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 7,457,451 searches. Data last updated September 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$96 | Average$223 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$200 | Average$434 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$235 | Average$353 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$253 | Average$391 | FlexibilityNo cancel fee | On-time63% |