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
08 Apr - 14 Apr	TAP
07 Apr - 10 Apr	Austrian Airlines
01 Apr - 06 Apr	TAP
01 Apr - 16 Apr	TAP
01 Apr - 15 Apr	TAP
20 Apr - 27 Apr	Aer Lingus
25 Apr - 30 Apr	Aer Lingus
24 Apr - 28 Apr	Aer Lingus
04 Apr - 10 Apr	Aer Lingus
30 Apr - 11 May	Aer Lingus
25 Apr - 02 May	Aer Lingus
17 Apr - 02 May	Air Canada
25 Apr - 02 May	Air France	direct
27 Apr - 04 May	Icelandair
17 Apr - 02 May	Finnair	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 $386

Return flights