From Gatwick Airport train to Reading then train to Cardiff Central. 3 h 18 min £79. From South Terminal Bus Station bus to Cardiff, Sophia Gardens. 4 h 40 min £42. From Gatwick Airport train to London Victoria, walk to Belgravia, Victoria Coach Station, then bus to Cardiff, Kingsway. 5 h 14 min £44. From London Gatwick Airport (LGW) drive to Cardiff. 2 h 48 min £34.