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

Return flights

25 Sep - 29 Sep	SWISS
19 Sep - 24 Sep	SWISS
22 Sep - 29 Sep	SWISS
26 Sep - 28 Sep	SWISS
24 Sep - 29 Sep	SWISS
24 Sep - 30 Sep	SWISS
24 Sep - 06 Oct	SWISS
24 Sep - 21 Oct	SWISS
24 Sep - 07 Oct	SWISS
22 Sep - 06 Oct	SWISS
22 Sep - 30 Sep	SWISS
16 Sep - 29 Sep	SWISS
16 Sep - 02 Oct	SWISS
24 Sep - 09 Oct	SWISS
24 Sep - 02 Oct	SWISS
24 Sep - 28 Sep	Lufthansa
15 Sep - 29 Sep	Lufthansa
26 Sep - 06 Oct	Lufthansa
25 Sep - 09 Oct	SWISS
25 Sep - 06 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 299€

Return flights