AirHint found the following cheapest return flights from London (LCY) to New York (JFK) in September 2025 (see full year).

Return flights

10 Sep - 16 Sep	SWISS
09 Sep - 15 Sep	SWISS
08 Sep - 16 Sep	SWISS
09 Sep - 16 Sep	SWISS
11 Sep - 15 Sep	SWISS
04 Sep - 08 Sep	SWISS
04 Sep - 11 Sep	SWISS
04 Sep - 07 Sep	SWISS
10 Sep - 15 Sep	SWISS
04 Sep - 09 Sep	SWISS
29 Sep - 13 Oct	SWISS
23 Sep - 07 Oct	SWISS
30 Sep - 07 Oct	SWISS
18 Sep - 08 Oct	SWISS
30 Sep - 23 Oct	SWISS
29 Sep - 07 Oct	SWISS
25 Sep - 09 Oct	SWISS
29 Sep - 06 Oct	SWISS
15 Sep - 22 Oct	SWISS
18 Sep - 16 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 $473

Return flights