Find the cheapest Finnair flights on Expedia from Boston (BOS) to London (LON). 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 Finnair for this route in the past 7 days starts at ฿10,750 for travel on July 18, 2027.
฿10,750 Cheap Finnair flights Boston (BOS) to London (LON)
Prices were available within the past 7 days and start at ฿10,750 for one-way flights and ฿29,075 for return, for the period specified. Prices and availability are subject to change.