SEARCH ONE AND DONE. - Compare hundreds of travel sites at once.
Choose where to book.
Find deals from over 400 airlines worldwide.

Cheap Flights from Washington to St Louis (IAD - STL)

DepartReturn
1 adult
Note: some airlines charge for infants in laps.
The price shown for each flight will be the average for all passengers including any infants.
Choose Sites to Compare vs. KAYAK

Best fares from IAD to STL (Found by others)

Sun Mon Tue Wed Thu Fri Sat
  1 $378 2 $427 3 $442 4 $336 5 $336 6 $398
7 $336 8 $394 9 $71 10 $300 11 $185 12 $139 13 $125
14 $329 15 $333 16 $125 17 $313 18 $115 19 $313 20 $105
21 $293 22 $293 23 $115 24 $287 25 $155 26 $199 27 $105
28 $293 29 $199 30 $105        
KAYAK searches hundreds of sites to find the best rate for your next flight from Washington to St Louis. Get the best flight deal for your St Louis trip!
Here's how it works. Search KAYAK for a flight ticket from Washington to St Louis. Sort, filter and compare results on one web page. Then book your plane ticket direct on the airline or travel agent site of your choice!
Direct flights IAD to STL on United
Flight # Depart IAD Arrive STL Sun Mon Tue Wed Thu Fri Sat Valid Between
3420 8:16 am 9:28 am Sep 21 - Oct 19
3420 8:16 am 9:28 am Sep 20 - Oct 25
3420 8:16 am 9:28 am Oct 7 - Oct 7
3420 8:16 am 9:28 am Sep 23 - Sep 30
3420 8:43 am 9:55 am Sep 6 - Sep 13
3420 8:43 am 9:55 am Sep 8 - Sep 19
3420 8:43 am 9:55 am Sep 3 - Sep 17
3357 12:21 pm 1:33 pm Sep 21 - Sep 21
3357 12:21 pm 1:33 pm Sep 7 - Sep 14
3357 12:21 pm 1:33 pm Sep 8 - Sep 16
3357 12:21 pm 1:33 pm Sep 18 - Sep 18
3357 12:21 pm 1:33 pm Sep 28 - Oct 5
3357 12:21 pm 1:33 pm Sep 20 - Oct 25
3357 12:21 pm 1:33 pm Sep 17 - Sep 19
3730 12:21 pm 1:29 pm Sep 23 - Oct 21
3730 12:21 pm 1:29 pm Sep 22 - Oct 17
4129 12:21 pm 1:33 pm Sep 6 - Sep 13
3367 3:35 pm 4:47 pm Sep 19 - Sep 19
3434 4:56 pm 6:08 pm Sep 23 - Oct 14
3434 4:56 pm 6:08 pm Sep 20 - Oct 11
3434 4:56 pm 6:08 pm Sep 21 - Oct 13
3434 5:00 pm 6:12 pm Sep 5 - Sep 17
3434 5:00 pm 6:12 pm Sep 18 - Sep 18
3434 5:04 pm 6:16 pm Sep 7 - Sep 14
3434 5:09 pm 6:21 pm Aug 30 - Sep 13
3434 5:23 pm 6:35 pm Sep 19 - Sep 19
3427 9:50 pm 10:56 pm Sep 7 - Sep 21
3427 9:50 pm 10:56 pm Sep 22 - Oct 22
3427 9:50 pm 10:56 pm Sep 23 - Oct 21
3427 9:57 pm 11:03 pm Aug 28 - Sep 19
3427 9:57 pm 11:03 pm Sep 1 - Sep 17