From Heathrow Terminal 1 train to Paddington (H&C Line)-Underground, Tube to London Kings Cross, then train to Kings Lynn. 2hrs 14min £48. From Heathrow Central Bus Station line 724 bus to Hatfield, The Galleria (Unknown), bus to Stevenage, train to Peterborough, Railway Station (Rail Station), then bus to King's Lynn, Bus Station. 4hrs 41min £36. From London Heathrow drive to King's Lynn. 2hrs 54min £24.