Post Office – Newton Stewart, Kirkcowan – Opening Hours & Branch Details Post Office is directly at 34 Main Street, approximately a 5.95 mile driving distance south-west of the centre of Newton Stewart (near Main Street). This branch is an excellent addition to the local businesses of Craighlaw, Cardurnock, Bridge of Dee, Kirkcowan, Kirkandrews-Upon-Eden, Kirkbean and Barraer. If you plan to swing by today (Friday), its hours of opening are 9:00 am – 5:30 pm. This page includes specifics on Post Office Newton Stewart, Kirkcowan, including the open hours, navigation and direct phone.