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

Return flights

01 May - 11 May	Icelandair
01 May - 12 May	Icelandair
01 May - 08 May	Icelandair
07 May - 11 May	Icelandair
03 May - 12 May	Icelandair
08 May - 14 May	Icelandair
01 May - 09 May	Icelandair
04 May - 08 May	Icelandair
04 May - 13 May	Icelandair
08 May - 12 May	Icelandair
13 May - 03 Jun	Icelandair
06 May - 12 Jun	Icelandair
20 May - 03 Jun	Icelandair
20 May - 01 Jun	Icelandair
20 May - 05 Jun	Icelandair
18 May - 07 Jun	Icelandair
21 May - 01 Jun	Icelandair
13 May - 03 Jun	Air France	direct
20 May - 05 Jun	Air France	direct
20 May - 03 Jun	Air France	direct

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 $437

Return flights