Greggs – Prestwick – Opening Hours & Store Details You will find Greggs situated at an ideal position at 85 Main Street, approximately a 0.31 mile drive north-east from the centre of Prestwick (by Prestwick Main St / Saunterne Rd Bus Stop). This store is situated properly to serve those from the areas of Prestwick, Monkton, Fairfields, St Quivox, Newton-On-Ayr, Heathfield, New Prestwick and Prestwick Internat’nl Airport. If you plan to drop in today (Friday), its open hours are 6:30 am until 6:00 pm. Hours of business, location details and phone info for Greggs Prestwick can be found on this page.