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

Return flights

12 Sep - 14 Sep	Iberia
11 Sep - 22 Sep	TAP
09 Sep - 01 Oct	TAP
23 Sep - 30 Sep	TAP
10 Sep - 16 Sep	TAP
11 Sep - 16 Sep	TAP
10 Sep - 17 Sep	TAP
25 Sep - 29 Sep	TAP
11 Sep - 15 Sep	TAP
30 Sep - 08 Oct	TAP
23 Sep - 07 Oct	TAP
26 Sep - 28 Sep	Finnair	direct
19 Sep - 21 Sep	Finnair	direct
25 Sep - 05 Oct	TAP
30 Sep - 05 Oct	TAP
29 Sep - 14 Oct	Iberia For Level
21 Sep - 12 Oct	TAP
26 Sep - 04 Oct	TAP
22 Sep - 29 Oct	Iberia For Level
28 Sep - 04 Oct	Iberia For Level

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 $392

Return flights