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

Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $229 (American Airlines) |
One-way from | $61 (CheapOair) |
Popular in | March |
Cheapest in | August |
Average price | $309 |
Good round-trip deal | $298 or less |
Good one-way deal | $146 or less |
Fly from
Fly to
Route
Depart
Return
Price
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Thu 11/20
8:00 am-6:58 pm
1 stop11h 58m
Lambert-St Louis
Sun 11/23
7:57 pm-1:03 pm
1 stop16h 06m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Wed 12/24
2:45 pm-4:05 pm
Nonstop2h 20m
Lambert-St Louis
Wed 12/31
1:10 pm-4:10 pm
Nonstop2h 00m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Sat 11/22
6:45 pm-8:10 pm
Nonstop2h 25m
Lambert-St Louis
Mon 11/24
7:55 am-12:50 pm
1 stop3h 55m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Sat 12/6
6:21 pm-9:57 pm
1 stop4h 36m
Lambert-St Louis
Sat 12/13
6:39 am-11:37 am
1 stop3h 58m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Sat 12/6
6:21 pm-9:57 pm
1 stop4h 36m
Lambert-St Louis
Tue 12/9
10:45 am-4:36 pm
1 stop4h 51m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Thu 12/4
12:37 pm-4:06 pm
1 stop4h 29m
Lambert-St Louis
Tue 12/9
6:00 am-11:37 am
1 stop4h 37m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Mon 12/8
5:31 pm-8:47 pm
1 stop4h 16m
Lambert-St Louis
Wed 12/10
5:15 pm-10:54 pm
1 stop4h 39m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Wed 12/24
6:05 am-11:25 am
1 stop6h 20m
Lambert-St Louis
Tue 12/30
5:20 am-1:00 pm
2 stops6h 40m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Tue 12/2
10:50 am-4:20 pm
1 stop6h 30m
Lambert-St Louis
Wed 12/3
5:45 am-3:05 pm
2 stops8h 20m
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Tue 12/2
7:55 am-2:35 pm
1 stop7h 40m
Lambert-St Louis
Wed 12/10
3:20 pm-6:15 pm
Nonstop1h 55m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
The best time to book flights from Washington, D.C. Reagan-National Airport to St. Louis is 76 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.
Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to St. Louis (average of $154). Flying from Washington, D.C. Reagan-National Airport to St. Louis in March is currently the most expensive (average of $242). 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.
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 17% on the cost of your flight, compared to a flight in the afternoon.
Travelers seeking maximum savings on their Washington, D.C. Reagan-National Airport to St. Louis flight should consider departing on Friday evenings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Comfort
Entertainment
Crew
Overall
Boarding
Food
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Overall
Boarding
Food
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Overall
Boarding
Food
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Overall
Boarding
Food
Reviews
Mike,Aug 2025
OKC - AUS
Comfort
Entertainment
Crew
Overall
Boarding
Food
Reviews
Mike,Aug 2025
OKC - AUS
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$327 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$188 | Average$317 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$223 | Average$336 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$223 | Average$323 | FlexibilityNo cancel fee | On-timeN/A |