From Heathrow Terminals 1-2-3 Underground Station Tube to London Kings Cross then train to Kings Lynn. 2hrs 46min £38. From Heathrow Central Bus Station line 727 bus to Trumpington, The Busway Trumpington Park-and-Ride (Car Park), bus to Cambridge, then train to Kings Lynn. 3hrs 21min £28. From London Heathrow Airport (LHR) drive to King's Lynn. 2hrs 10min £24.