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

Return flights

30 Sep - 06 Oct	Air Canada
22 Sep - 06 Oct	Lufthansa
29 Sep - 06 Oct	Air Canada
23 Sep - 08 Oct	Air Canada
24 Sep - 08 Oct	Air Canada
30 Sep - 07 Oct	Air Canada
17 Sep - 24 Sep	Air Canada
21 Sep - 23 Sep	Air Canada
17 Sep - 19 Sep	Air Canada
25 Sep - 07 Oct	Air Canada
29 Sep - 12 Oct	Air Canada
28 Sep - 16 Oct	Air Canada
28 Sep - 30 Sep	Air Canada
25 Sep - 28 Sep	Air Canada
18 Sep - 22 Sep	Air Canada
25 Sep - 03 Oct	Air Canada
17 Sep - 25 Sep	Air Canada
19 Sep - 21 Sep	Air Canada
18 Sep - 30 Sep	Air Canada

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 $412

Return flights