Post Office – Castle Douglas, Gatehouse-Of-Fleet – Opening Hours & Branch Details Post Office is situated in an ideal location at 52 High Street, approximately a 10.78 mile driving distance west from the centre of Castle Douglas (a few minutes walk from Murray Arms). This branch essentially serves patrons from the districts of Rusko, Borgue, Anwoth, Girthon, Gatehouse of Fleet, Ardwall and Twynholm. If you would like to drop by today (Friday), its opening hours are 7:00 am to 8:00 pm. Please review the specifics on this page for Post Office Castle Douglas, Gatehouse-Of-Fleet, including the operating times, location particulars and customer rating.