I asked a similar question in 2008 but for a different time of year and for a different reason.
We are planning to spend Xmas in the Boston "sunshine", probably with a stopover somewhere in each direction, shortly after the birth of a grandchild. It seems we've missed the discounted economy fares that were available.
If anyone has any information or suggestions on fares / routes that may be available then I'd be grateful to learn of them.
We live in Perth but are able to use Sydney as a point of departure and return.
PS __ Looking at leaving Perth in the first week of December and leaving Boston around December 27.