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

Return flights

01 May - 09 May	Icelandair
04 May - 11 May	Icelandair
01 May - 05 May	Icelandair
10 May - 13 May	Icelandair
07 May - 10 May	Icelandair
10 May - 14 May	Icelandair
01 May - 12 May	Icelandair
04 May - 13 May	Icelandair
09 May - 16 May	TAP
12 May - 26 May	Icelandair
20 May - 03 Jun	Aer Lingus
31 May - 14 Jun	Aer Lingus
26 May - 09 Jun	Icelandair
19 May - 09 Jun	SWISS
22 May - 01 Jun	Aer Lingus
31 May - 03 Jun	Aer Lingus
28 May - 11 Jun	Icelandair
03 May - 07 Jun	Aer Lingus

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 $383

Return flights