I see Jetblue DCA->BDL
BDL->DCA
for $99 RT, nonstop, 1.5 hours each way, 3/16 -> 3/19
$150 for more restrictive dates (eg 1-2 days instead of 3 days)
use
http://matrix.itasoftware.com to find the correct routings (can specify multiple airports+distances+flexible dates etc). this software is meant for your usecase