From Stansted Airport train to Liverpool Street Underground Station, Tube to London Paddington, then train to Cardiff Central. 3hrs 11min £62. From London Stansted bus to Victoria Coach Station then bus to Cardiff, Kingsway. 5hrs 37min £37. From Stansted Airport, Coach Station (Stansted Aprt) bus to Harlow Town Centre, Bus Station (Harlow Bus Stn), line 724 bus to Heathrow Central Bus Station, line 202 bus to Newport, Market Square, then bus to Cardiff, Castle Street (Castle Arcade). 7hrs 55min £43. From London Stansted drive to Cardiff. 3hrs 19min £39. From London Stansted airport fly to Bristol airport, bus to Bristol Temple Meads, then train to Cardiff. 5hrs 53min £100.