Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.
Round-trip from | $209 (Priceline) |
---|---|
One-way from | $111 (Frontier) |
Popular in | July |
Cheapest in | August |
Average price | $545 |
Good round-trip deal | $924 or less |
Good one-way deal | $219 or less |
Fly from
Fly to
Route
Depart
Return
Price
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Thu 7/31
2:36 pm-12:12 am
1 stop8h 36m
Washington, D.C. Dulles Intl
Sun 8/3
11:02 am-6:59 pm
1 stop8h 57m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Wed 9/24
6:00 pm-11:06 pm
1 stop4h 06m
Washington, D.C. Dulles Intl
Mon 9/29
12:08 pm-4:48 pm
1 stop5h 40m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Mon 8/18
5:30 pm-12:30 am
1 stop6h 00m
Washington, D.C. Dulles Intl
Sun 8/24
8:40 am-10:02 am
Nonstop2h 22m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Sat 8/30
5:27 am-12:48 pm
1 stop6h 21m
Washington, D.C. Dulles Intl
Mon 9/1
6:34 am-12:02 pm
1 stop6h 28m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Wed 8/27
6:20 am-4:15 pm
1 stop8h 55m
Washington, D.C. Dulles Intl
Wed 9/3
5:45 am-5:50 pm
2 stops13h 05m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Thu 7/31
8:44 pm-10:07 am
1 stop12h 23m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Thu 8/7
8:15 am-11:23 am
Nonstop2h 08m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Thu 8/21
9:50 am-6:15 pm
2 stops7h 25m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Sat 9/6
6:40 am-11:32 am
1 stop3h 52m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Thu 9/11
5:27 am-11:34 am
1 stop5h 07m
The best time to book flights from St. Louis to Washington, D.C. Dulles Intl Airport is 75 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, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Dulles Intl Airport (average of $309). Flying from St. Louis to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $345). 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 St. Louis to Washington, D.C. Dulles Intl Airport in the evening. By choosing this option you can save up to 79% on the cost of your flight, compared to a flight at noon.
The most flights from STL to IAD are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (6 on average).
Entertainment
Food
Boarding
Overall
Crew
Comfort
Reviews
John,May 2025
PVD - BNA
Entertainment
Food
Boarding
Overall
Crew
Comfort
Reviews
John,May 2025
PVD - BNA
Entertainment
Food
Boarding
Overall
Crew
Comfort
Reviews
John,May 2025
PVD - BNA
Entertainment
Food
Boarding
Overall
Crew
Comfort
Reviews
John,May 2025
PVD - BNA
Entertainment
Food
Boarding
Overall
Crew
Comfort
Reviews
John,May 2025
PVD - BNA
Entertainment
Food
Boarding
Overall
Crew
Comfort
Reviews
John,May 2025
PVD - BNA
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$129 | Average$408 | FlexibilityNo cancel fee | On-time71% | |
Cheapest$191 | Average$263 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$209 | Average$436 | FlexibilityNo cancel fee | On-time69% |