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

Return flights

26 Sep - 14 Oct	Aer Lingus
17 Sep - 21 Sep	Aer Lingus
15 Sep - 22 Sep	Aer Lingus
26 Sep - 05 Oct	Aer Lingus
30 Sep - 05 Oct	Aer Lingus
23 Sep - 30 Sep	Air Canada
18 Sep - 22 Sep	Aer Lingus
05 Sep - 08 Sep	Air Canada
28 Sep - 05 Oct	Aer Lingus
08 Sep - 11 Sep	Aer Lingus
30 Sep - 07 Oct	Aer Lingus
24 Sep - 12 Oct	Norse Atlantic Airways
12 Sep - 16 Sep	Air Canada
15 Sep - 19 Sep	Aer Lingus
13 Sep - 16 Sep	Icelandair
09 Sep - 23 Sep	Norse Atlantic Airways
26 Sep - 04 Oct	Aer Lingus
30 Sep - 08 Oct	Aer Lingus
25 Sep - 05 Oct	Aer Lingus
21 Sep - 12 Oct	Aer Lingus

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from New York to London in September from 347€

Return flights