Sadly its not UA, but try this:

BDL-DFW AA 619 V 28JUN 1245-1545 738
DFW-PDX AA1961 V 28JUN 1730-1930 M80

You'll need a good agent - perhaps at AA or perhaps at at travel agency.

The space is available for each segment seperately, but does not come up in Sabre when requesting BDL-PDX. Have each segment booked seperately on the same PNR in V class and then the agent should through price it.

I've checked fare rules and see no restriction for travel on 28JUN nor restriction for travel via DFW.

Fare basis is VA10ERR1.

Fare 126 + 27.91 peak travel day surcharge