From Heathrow Terminals 1-2-3 Underground Station Tube to London Kings Cross then train to Kings Lynn. 3hrs 06min £39. From Heathrow Central Bus Station line 727 bus to Thetford, Bus Interchange then line 40 bus to King's Lynn, Transport Interchange. 5hrs 50min £38. From London Heathrow Airport (LHR) drive to King's Lynn. 2hrs 10min £25.