From Gatwick Airport train to Reading then train to Cardiff Central. 3hrs 27min £78. From Gatwick Airport train to Victoria Coach Station then bus to Cardiff, Kingsway. 5hrs 19min £58. From South Terminal Bus Station bus to Heathrow Central Bus Station then line 202 bus to Cardiff, Sophia Gardens. 5hrs 45min £117. From London Gatwick Airport (LGW) drive to Cardiff. 2hrs 48min £35. From London Gatwick airport fly to Cardiff airport then bus to Cardiff. 4hrs 27min £184.