Post Office – Portstewart, Larkhill – Opening Hours & Branch Details Post Office is found in a convenient position on Larkhill Service Station, a 1.08 mile driving distance south of the centre of Portstewart (a few minutes walk from Larkhill). This branch is a wonderful addition to the local businesses of Portstewart Town Centre, North Ballyleese, Galvally, South Mullaghacall, North Mullaghacall, Nare, Cappagh More and Garrylabin. 9:00 am until 5:30 pm are its opening times for today (Friday). On this page you can find all the up-to-date information about Post Office Portstewart, Larkhill, including the operating hours, local navigation, customer feedback, and further details.