Find the cheapest American Airlines flights on Expedia from London (LHR) to Boston (BOS). Flight ticket prices change frequently based on availability and demand. We send price-drop alerts to make air travel simple and flexible. The lowest one-way fare found on Expedia with American Airlines for this route in the past 7 days starts at £447 for travel on 10 February 2027.
£447 Cheap American Airlines flights London (LHR) to Boston (BOS)
Prices were available within the past 7 days and start at £447 for one-way flights and £495 for return, for the period specified. Prices and availability are subject to change.