JetBlue and American Airlines have round-trip flights from Dallas (DFW) to Boston (BOS) for $127, NONSTOP. Flights November to February. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. Dates over Thanksgiving are available.
JetBlue’s “Basic” fares allow for a carry-on bag and a small personal item (17 x 13 x 8 inches), like a Jansport SuperBreak backpack without a fee. You can avoid seat selection fees by accepting the randomly assigned seat at the gate.