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

Return flights

08 May - 21 May	TAP
05 May - 12 May	TAP
05 May - 13 May	TAP
13 May - 20 May	Air Canada
05 May - 20 May	British Airways
07 May - 21 May	Air Canada
08 May - 22 May	Aer Lingus
01 May - 08 May	British Airways
04 May - 13 May	Aer Lingus
10 May - 17 May	Air Canada
06 May - 07 Jun	Icelandair
06 May - 07 Jun	Virgin Atlantic	direct
07 May - 07 Jun	Aer Lingus
18 May - 01 Jun	Icelandair
21 May - 07 Jun	Aer Lingus
07 May - 07 Jun	Air France	direct
18 May - 01 Jun	Air France	direct
21 May - 07 Jun	Air France	direct
22 May - 03 Jun	British Airways
28 May - 01 Jun	United

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 371€

Return flights