The film premiered at Toronto last year and follows the exploits of a disillusioned woman who enlists two friends and embarks upon a trip across the Great American West. Tom Skerritt also stars.
Daniel Davis wrote the screenplay and Robert May and John Kilker produced, with Bob Brown and R Michael Bergeron serving as executive producers.
Guardian, co-president Rich Goldberg and senior vice president of acquisitions Joseph Dickstein negotiated the deal with Brown and May. Cinetic Media holds domestic rights.
Lightning's Cannes line-up features the coming-of-age comedy Hey Hey, It's Esther Blueburger, teen comedy The Cougar Club, Australian hit Kenny, sci-fi title The Dark Hour, horror-thriller Unrest, and the romance West.