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

Return flights

27 Apr - 06 May	Icelandair
14 Apr - 20 Apr	Air Canada
21 Apr - 29 Apr	Icelandair
21 Apr - 28 Apr	Icelandair
23 Apr - 28 Apr	Icelandair
15 Apr - 20 Apr	Air Canada
12 Apr - 21 Apr	Icelandair
23 Apr - 29 Apr	Icelandair
22 Apr - 28 Apr	SWISS
22 Apr - 29 Apr	SWISS
13 Apr - 22 Apr	Air Canada
29 Apr - 10 May	Icelandair
30 Apr - 06 May	Air Canada
23 Apr - 03 May	Icelandair
27 Apr - 02 May	Air Canada
25 Apr - 02 May	Aer Lingus
30 Apr - 03 May	Air Canada
22 Apr - 02 May	Icelandair
23 Apr - 12 May	Air Canada
26 Apr - 02 May	Aer Lingus

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

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 April from $371

Return flights