Real estate sources tell TMZ ... Bristol is rarely home now that she's all hooked up with her new fiance, Medal of Honor winner Sgt. Dakota Meyer -- so she doesn't need the 3-bed, 3.5-bath 3,200 sq. ft. pad anymore.
She snagged the lakeside digs in Wasilla back in 2011 for $388k, but now wants $549k for it. We're told she completely remodeled it -- plus, it's got sweet mountain and lake views from the master bedroom.
As for where Bristol and her man are moving -- we're not sure yet, but we'd be shocked if she ended up in the Lower 48.
Leaving Mama Bear ... always risky.