Decathlon – Belfast – Opening Hours & Store Details You’ll find Decathlon situated in an ideal space in Holywood Exchange Retail Park on Airport Road West, approximately a 3.42 mile drive north-east of the centre of Belfast (nearby Esporta Sports Centre). The store mainly provides service to patrons from the districts of Newtownabbey, The Walled Garden Belmont, Crumlin, Holywood, Knocknagoney, Donaghadee, Sydenham and Bangor. Today’s open hours (Friday) are from 9:00 am to 9:00 pm. This page will supply you with all the information you need on Decathlon Belfast, including the hours of business, address info, customer rating and other relevant info.