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

Return flights

26 Sep - 28 Sep	SWISS
30 Sep - 07 Oct	Air Canada
10 Sep - 21 Oct	Air Canada
21 Sep - 09 Oct	Aer Lingus
22 Sep - 21 Oct	Aer Lingus
28 Sep - 19 Oct	Air Canada
12 Sep - 22 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
30 Sep - 19 Oct	Air Canada
09 Sep - 17 Sep	Air Canada
12 Sep - 16 Sep	Air Canada
21 Sep - 24 Sep	Aer Lingus
20 Sep - 22 Sep	Scandinavian Airlines
09 Sep - 18 Sep	Air Canada
21 Sep - 06 Oct	Aer Lingus
23 Sep - 08 Oct	Air Canada
29 Sep - 21 Oct	Air Canada
12 Sep - 14 Sep	Air Canada
25 Sep - 09 Oct	Austrian Airlines
09 Sep - 16 Sep	Air Canada

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 $459

Return flights