Little help if possible as it's been a long while since I've flown from GB airport....
1. How long to walk from Sydenham train stop to airport
2. If checking in online and no bags...how close can you cut arriving at airport for flight - 45min before departure time ?
Its about 15 minute walk from train stop to terminal. 45 minutes should be plenty , if walking through ! No security issue delays to speak off !
Was there at 6am for 7 am flight yesterday. Was parked and through security by 6.05