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

Return flights

08 Sep - 14 Sep	LEVEL
21 Sep - 28 Sep	LEVEL
08 Sep - 16 Sep	LEVEL
09 Sep - 16 Sep	LEVEL
16 Sep - 22 Sep	Wizz Air UK
09 Sep - 19 Sep	Wizz Air UK
07 Sep - 15 Sep	Wizz Air Malta
30 Sep - 10 Oct	Icelandair
02 Sep - 16 Sep	LEVEL
09 Sep - 18 Sep	Wizz Air UK
24 Sep - 14 Oct	Icelandair
25 Sep - 14 Oct	Icelandair
16 Sep - 23 Sep	Wizz Air UK
22 Sep - 07 Oct	Icelandair
26 Sep - 05 Oct	Icelandair
25 Sep - 04 Oct	Icelandair
29 Sep - 06 Oct	Icelandair
25 Sep - 03 Oct	Icelandair
18 Sep - 02 Oct	Icelandair
30 Sep - 03 Oct	Icelandair

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

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 London to Boston in September from 350€

Return flights