American Airlines has round-trip flights from Dallas (DFW) to Boston (BOS) for $123-$132, NONSTOP. Flights December to March. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Origin/Destination reversible. No Christmas dates available.
American is matching the large Domestic Airfare sale that we mentioned yesterday (link). View that post for the full list. This post is only focusing on Boston.