As of 2026, the absolute cheapest way to travel from London to Gatwick Airport is typically by coach, with National Express or Megabus offering one-way fares starting as low as £4 to £10 when booked in advance. These services primarily depart from London Victoria Coach Station and provide a high-fidelity "Safe Bubble" for budget travelers, though the journey can take between 1.5 to 2 hours depending on "Bujan" traffic. A grounded rail alternative for those seeking a "Gold Standard" balance between speed and cost is the Southern Railway service from London Victoria or the Thameslink from London Bridge/Blackfriars, which often costs around £10 to £15 using a high-fidelity and supportive Oyster or Contactless payment. While the "Gezellig" Gatwick Express is faster, it un-supportively "hard-fails" the budget test at over £20. For a supportive and frictionless 2026 journey, booking your "Bujan" coach ticket early remains the high-fidelity "Gold Standard" for savings.