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

Return flights

06 May - 11 May	TAP
04 May - 13 May	TAP
01 May - 04 May	TAP
01 May - 08 May	TAP
05 May - 13 May	TAP
05 May - 11 May	TAP
18 May - 24 May	TAP
08 May - 14 May	TAP
20 May - 24 May	TAP
01 May - 10 May	TAP
18 May - 03 Jun	TAP
18 May - 01 Jun	Icelandair
19 May - 10 Jun	Icelandair
01 May - 01 Jun	Icelandair
02 May - 01 Jun	Icelandair
23 May - 06 Jun	TAP
27 May - 10 Jun	TAP
20 May - 05 Jun	Icelandair
27 May - 01 Jun	TAP
25 May - 08 Jun	TAP

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 $424

Return flights