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

Return flights

22 Sep - 07 Oct	Air Canada
17 Sep - 24 Sep	Air Canada
30 Sep - 30 Oct	Icelandair
30 Sep - 13 Oct	Icelandair
30 Sep - 08 Oct	SWISS
30 Sep - 07 Oct	SWISS
30 Sep - 06 Oct	SWISS
21 Sep - 24 Sep	Air Canada
29 Sep - 06 Oct	Air Canada
24 Sep - 05 Oct	Air Canada
24 Sep - 01 Oct	SWISS
22 Sep - 26 Sep	Aer Lingus
29 Sep - 02 Oct	Spirit Airlines
21 Sep - 25 Sep	Aer Lingus
21 Sep - 22 Sep	Air Canada
21 Sep - 23 Sep	Air Canada
26 Sep - 29 Sep	Spirit Airlines
22 Sep - 29 Sep	Icelandair
19 Sep - 23 Sep	Air Canada
18 Sep - 23 Sep	SWISS

Also check the deals for one-way flights from Newark 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 Newark to London in September from $472

Return flights