There are low summer 2017 tickets from Boston to London available every date June to August at $466 round trip with Delta/Virgin Atlantic and Air Canada/United. With low fares to just about everywhere in Europe available from London airports, this is an opportunity to secure a cheap round trip ticket to anywhere in Europe you want to go this summer. Other airports around Europe are priced $900 to $1,200+ round trip for summer 2017 travel.
These low fares are available from early December to August, but the summer fares are the real deal.
Boston to London Google Flights Fare Calendar July-August 2017 filtered for SkyTeam
Delta Airlines Boston – London LHR nonstop flights
$465.96 Sat Jul 8 – Sun Jul 16
Boston to London Google Flights Fare Calendar July-August 2017 filtered for Star Alliance
Star Alliance $462-$469 July 1 – Aug 22 departures (Air Canada tickets are cheapest)
United Airlines Boston BOS – Newark EWR – London LHR (UA) – Frankfurt FRA (LH) – Boston (Lufthansa)