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

Return flights

30 Sep - 07 Oct	Lufthansa
23 Sep - 30 Sep	Air Canada
29 Sep - 15 Oct	Air Canada
22 Sep - 29 Sep	Air Canada
30 Sep - 02 Oct	Aer Lingus
30 Sep - 08 Oct	SWISS
30 Sep - 14 Oct	SWISS
30 Sep - 16 Oct	Lufthansa
26 Sep - 07 Oct	Aer Lingus
26 Sep - 08 Oct	Lufthansa
30 Sep - 31 Oct	Norse Atlantic Airways
24 Sep - 30 Sep	SWISS
26 Sep - 01 Oct	Aer Lingus
22 Sep - 27 Sep	Air Canada
24 Sep - 29 Sep	SWISS
26 Sep - 29 Sep	Lufthansa
25 Sep - 30 Sep	FrenchBee
26 Sep - 30 Sep	Norse Atlantic Airways
27 Sep - 30 Sep	FrenchBee
23 Sep - 29 Sep	Norse Atlantic Airways

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 336€

Return flights