What airport is closer to Cardiff Birmingham or heathrow?

Cardiff Airport (CWL) is the closest airport to Cardiff, located approximately 19 kilometres (12 miles) southwest of the city centre. Birmingham Airport (BHX) is approximately 153 kilometres (95 miles) northeast of Cardiff, while Heathrow Airport (LHR) is approximately 221 kilometres (137 miles) southeast of Cardiff.

Therefore, Cardiff Airport is the closest airport to Cardiff compared to Birmingham and Heathrow airports.