Post Office – Newton Stewart – Opening Hours & Branch Details Post Office is located at 3 – 5 Victoria Street, a 0.19 mile driving distance south of the centre of Newton Stewart (by Victoria St and St Ninian’s Rc School). The branch chiefly serves the customers in the areas of Palnure, Newton Stewart Town Centre, Kirkcowan, Challoch, Barraer and Minnigaff. If you’d like to drop by today (Friday), it’s open from 9:00 am until 5:30 pm. On this page, you may find operating times, local navigation, phone number and more information about Post Office Newton Stewart.