From Gatwick Airport train to Reading then train to Cardiff Central. 3 h 18 min £78. From Gatwick Airport London bus to Cardiff Coach Station. 4 h 40 min £35. From London Gatwick Airport (LGW) drive to Cardiff. 2 h 48 min £33. From London Gatwick airport fly to Cardiff airport then bus to Cardiff. 3 h 55 min £106.