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

Return flights

18 Apr - 20 Apr	Air Canada
13 Apr - 21 Apr	Icelandair
13 Apr - 20 Apr	Icelandair
22 Apr - 28 Apr	Icelandair
12 Apr - 21 Apr	Icelandair
24 Apr - 29 Apr	Icelandair
21 Apr - 29 Apr	Icelandair
13 Apr - 22 Apr	Icelandair
01 Apr - 11 Apr	Icelandair
21 Apr - 28 Apr	Icelandair
26 Apr - 03 May	Icelandair
26 Apr - 02 May	Icelandair
30 Apr - 11 May	Icelandair
30 Apr - 06 May	Icelandair
23 Apr - 01 May	Aer Lingus
17 Apr - 01 May	Air Canada
23 Apr - 10 May	Aer Lingus
06 Apr - 01 May	Aer Lingus
20 Apr - 01 May	Aer Lingus
29 Apr - 03 May	Delta	direct

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 $393

Return flights