[10/02/2015 @ 1:55 PM] A few dates left, end of October, start of November. United and JetBlue have removed their fares. AA is still available. Updated post details.
American, United and JetBlue have round-trip flights from Dallas (DFW) to Boston (BOS) for $80-$127, NONSTOP. Cheapest flights TUE/WED October to November. Fare is reversible. No Turkey Day. See the Flight Details section of this post for example dates.
Carrier will depend on the dates selected.