AirHint found the following cheapest return flights from London (LCY) to New York (JFK) in September 2026 (see full year).

Return flights

21 Sep - 27 Sep	SWISS
14 Sep - 22 Sep	SWISS
14 Sep - 17 Sep	SWISS
15 Sep - 19 Sep	KLM
07 Sep - 19 Sep	KLM
22 Sep - 26 Sep	KLM
21 Sep - 26 Sep	KLM
11 Sep - 23 Sep	Delta
13 Sep - 17 Sep	Delta
28 Sep - 02 Oct	KLM
20 Sep - 23 Sep	Delta
22 Sep - 09 Oct	KLM
24 Sep - 01 Oct	ITA Airways
18 Sep - 19 Oct	ITA Airways
17 Sep - 19 Oct	ITA Airways
21 Sep - 05 Oct	ITA Airways
30 Sep - 07 Oct	ITA Airways
19 Sep - 03 Oct	SWISS

Also check the deals for one-way flights from London to New York 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 New York in September from $639

Return flights