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

Return flights

18 Sep - 28 Sep	SWISS
24 Sep - 18 Oct	SWISS
19 Sep - 20 Oct	SWISS
17 Sep - 22 Oct	SWISS
10 Sep - 23 Sep	SWISS
06 Sep - 26 Sep	SWISS
18 Sep - 27 Sep	SWISS
13 Sep - 26 Sep	SWISS
12 Sep - 21 Sep	SWISS
10 Sep - 18 Sep	SWISS
10 Sep - 22 Sep	SWISS
16 Sep - 23 Sep	SWISS
17 Sep - 26 Sep	SWISS
09 Sep - 07 Oct	SWISS
15 Sep - 06 Oct	Lufthansa
22 Sep - 06 Oct	Lufthansa
21 Sep - 06 Oct	Lufthansa
07 Sep - 06 Oct	Lufthansa
25 Sep - 12 Oct	Lufthansa
15 Sep - 22 Oct	SWISS

Also check the deals for one-way flights from London to Newark 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 London to Newark in September from 352€

Return flights