From Barnstaple train to Exeter, St Davids Station, bus to Exeter airport, then fly to London Heathrow airport. 7hrs 42min £203. From Barnstaple train to Exeter St. Davids, train to Reading Town Centre, Reading RailAir (Adj Reading Station RailAir), then bus to Heathrow Airport, Heathrow Terminal 1 Departures. 4hrs 36min £48. From Barnstaple, Bus Station bus to North Petherton, Verriers, bus to Bridgwater, Bus Station Stop 1, then line 504 bus to Heathrow Central Bus Station. 6hrs 00min £33. From Barnstaple drive to London Heathrow. 3hrs 16min £38. From Barnstaple train to Exeter, St Davids Station, bus to Exeter airport, fly to London City airport, train to Canning Town Underground Station, Tube to Green Park Underground Station, then Tube to London Heathrow. 6hrs 40min £286.