JetBlue has just launched a sale, with fares as low as $29 each way. Travel must be booked before Sept. 11; trips need to be completed by Dec. 16.; and sale fares require up to a 7-day advance purchase.
The Thanksgiving holiday period is blacked out and it will come as no surprise that "advertised fares are most often found on midweek travel dates.''
Here's a quick look at the advertised one-way prices from Logan: to Baltimore is $39; Washington Dulles $49; Charlotte, N.C. $69; and LA $109.
And the rest of the fine print can be found here.