West Hampstead Thameslink station is on the Thameslink Line, running from Bedford to King's Cross Thameslink and then through London and on to Brighton.
Stations on this line include:
Bedford (57 minutes to King's Cross)
Flitwick (48 minutes to King's Cross)
Harlington (44 minutes to King's Cross)
Leagrave (38 minutes to King's Cross)
Luton (34 minutes to King's Cross)
Luton Airport Parkway (32 minutes to King's Cross)
Harpenden (26 minutes to King's Cross)
St Albans (20 minutes to King's Cross)
Radlett (26 minutes to King's Cross)
Elstree and Borehamwood (22 minutes to King's Cross)
Mill Hill Broadway (18 minutes to King's Cross)
Hendon (15 minutes to King's Cross)
Cricklewood (11 minutes to King's Cross)
West Hampstead Thameslink (9 minutes to King's Cross)
Kentish Town (5 minutes to King's Cross)
London Kings Cross Thameslink