From USD 29,00 per night. Search and book a night in a hotel in Aberdare (United Kingdom) for a nice holiday or weekend. Aberdare (Aberdar in Welsh) is a town in the Cynon Valley area of Rhondda Cynon Taf, Wales. Aberdare is 3.5 miles south-west of Merthyr Tydfil, 20 miles north-west of Cardiff and 22 miles east-norht-east of Swansea.