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

Return flights

11 Sep - 22 Sep	Austrian Airlines
29 Sep - 20 Oct	Austrian Airlines
02 Sep - 13 Sep	Air Canada
09 Sep - 09 Oct	Scandinavian Airlines
10 Sep - 24 Sep	Aer Lingus
09 Sep - 24 Sep	Aer Lingus
17 Sep - 30 Sep	Aer Lingus
20 Sep - 04 Oct	Aer Lingus
17 Sep - 10 Oct	Aer Lingus
18 Sep - 04 Oct	Aer Lingus
30 Sep - 31 Oct	Air Canada
16 Sep - 22 Sep	SWISS
03 Sep - 20 Sep	SWISS
20 Sep - 22 Sep	SWISS
13 Sep - 29 Sep	SWISS
08 Sep - 23 Sep	SWISS
24 Sep - 10 Oct	SWISS
25 Sep - 01 Oct	SWISS
15 Sep - 15 Oct	Aer Lingus
24 Sep - 08 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 354€

Return flights