AirHint found the following cheapest return flights from Boston (BOS) to London (STN) in May 2026 (see full year).

Return flights

05 May - 13 May	Air Canada
06 May - 12 May	Air Canada
07 May - 11 May	Air Canada
07 May - 13 May	Air Canada
14 May - 21 May	Icelandair
09 May - 16 May	Icelandair
01 May - 05 May	Icelandair
04 May - 19 May	Icelandair
14 May - 23 May	Icelandair
07 May - 14 May	Air Canada
11 May - 01 Jun	Iberia
18 May - 16 Jun	Aer Lingus
23 May - 06 Jun	Lufthansa
25 May - 16 Jun	Lufthansa
28 May - 01 Jun	Icelandair
27 May - 17 Jun	Lufthansa
20 May - 21 Jun	Turkish Airlines

Also check the deals for one-way flights from Boston to London in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Boston to London in May from $393

Return flights