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

Return flights

09 Sep - 23 Sep	Brussels Airlines
09 Sep - 24 Sep	Brussels Airlines
10 Sep - 01 Oct	Brussels Airlines
10 Sep - 14 Oct	Brussels Airlines
15 Sep - 29 Sep	SWISS
17 Sep - 23 Sep	SWISS
13 Sep - 22 Sep	SWISS
08 Sep - 23 Sep	SWISS
12 Sep - 27 Sep	Brussels Airlines
12 Sep - 28 Sep	Brussels Airlines
16 Sep - 30 Sep	SWISS
16 Sep - 24 Sep	SWISS
10 Sep - 09 Oct	SWISS
24 Sep - 06 Oct	SWISS
21 Sep - 01 Oct	SWISS
22 Sep - 06 Oct	SWISS
16 Sep - 27 Oct	SWISS
16 Sep - 01 Oct	SWISS
25 Sep - 14 Oct	SWISS
22 Sep - 14 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 350€

Return flights