Nice find!
NAG21AKN one-way fare, appears good now thru Oct 30. Routing allows:
BWI-
CHI/DEN/
EWR/HOU/
LAX/SFO/WAS -SJC
But IAH appears to be the only connection that currently works, likely due to N-fare seats not available via other connections.
EDIT: channa has pointed out on the next post...most of routing rules are not flown. Above has been marked up accordingly, and IAH is the option which produces the best PQM.
Looks like Thu 10 Sep same-day turn BWI-IAH-SJC-IAH-BWI is possible for $240:
http://goo.gl/flights/LOHn
...but IAH is a stop on the return, so YMMV.
ADDENDUM: See also:
UA:$238 Sep BWI-PDX rt 6119PQM 3.88cpm