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

One-Way flights

25 Sep	jetBlue	direct
23 Sep	jetBlue	direct
28 Sep	jetBlue	direct
30 Sep	Vueling Airlines
30 Sep	jetBlue	direct
29 Sep	TAP
24 Sep	Aegean Airlines
29 Sep	Finnair	direct
22 Sep	Icelandair
26 Sep	Avianca

Also check the deals for return flights from London to New York 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 one-way flights from London to New York in September from 278€

One-Way flights