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

Return flights

08 Sep - 17 Sep	TAP
07 Sep - 17 Sep	TAP
07 Sep - 14 Sep	TAP
07 Sep - 16 Sep	TAP
09 Sep - 16 Sep	TAP
03 Sep - 10 Sep	TAP
02 Sep - 10 Sep	TAP
09 Sep - 17 Sep	TAP
07 Sep - 13 Sep	TAP
21 Sep - 02 Oct	TAP
15 Sep - 24 Sep	TAP
30 Sep - 28 Oct	TAP
10 Sep - 08 Oct	Air Canada
01 Sep - 31 Oct	Icelandair
28 Sep - 06 Oct	TAP
17 Sep - 14 Oct	Air Canada
20 Sep - 12 Oct	Icelandair
24 Sep - 02 Oct	Icelandair
27 Sep - 05 Oct	Icelandair
29 Sep - 04 Oct	Icelandair

Also check the deals for one-way flights from New York to London 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 New York to London in September from $368

Return flights