From Plymouth train to Exeter, St Davids Station, bus to Exeter airport, then fly to London Stansted airport. 8hrs 45min £392. From Plymouth train to Lancaster Gate Underground Station, Tube to London Liverpool St, then train to Stansted Airport. 4hrs 28min £77. From Bretonside Bus Station bus to London Victoria Station then bus to London Stansted. 6hrs 45min £42. From Plymouth drive to London Stansted. 4hrs 30min £55.