Costco – Southall – Opening Hours & Store Details Costco currently occupies a space in Western International Market situated on Hayes Rd, a 1.50 mile drive south-west of the centre of Southall, in Hounslow (nearby London Airlinks Golf Course and David Lloyd Heston). This store is situated in a convenient area that primarily serves the people of Heston Grange, Hayes, Wheatlands Estate, Harlington, Cranford Cross, Cranford, Heston and Southall. Operating hours, store address info and email contact for Costco Southall can be found on this page.