Currently, the lowest-price month to take a flight to London is May/2020.
Singapore Airlines, Lufthansa, Austrian Airlines, Air New Zealand, KLM, British Airways, Virgin Atlantic, Air France, Iberia, Finnair, Delta, United, American Airlines, Brussels Airlines and Norwegian Air UK fly non-stop between the United States of America and London.
TAP AIR PORTUGAL is the cheapest airline that flies to London from the United States of America.
Singapore Airlines is the best airline to fly from the United States of America to London and it flies direct. WestJet is the best budget airline.