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

Return flights

25 Sep - 15 Oct	TAP
25 Sep - 02 Oct	TAP
09 Sep - 23 Sep	TAP
25 Sep - 01 Oct	TAP
19 Sep - 21 Sep	Scandinavian Airlines
20 Sep - 22 Sep	Scandinavian Airlines
06 Sep - 08 Sep	Scandinavian Airlines
13 Sep - 15 Sep	Scandinavian Airlines
19 Sep - 22 Sep	Scandinavian Airlines
27 Sep - 28 Sep	Scandinavian Airlines
05 Sep - 08 Sep	Scandinavian Airlines
23 Sep - 21 Oct	TAP
18 Sep - 23 Sep	Air Canada
24 Sep - 01 Oct	TAP
27 Sep - 11 Oct	Aer Lingus
24 Sep - 14 Oct	Aer Lingus
24 Sep - 10 Oct	Aer Lingus
06 Sep - 24 Sep	Aer Lingus
26 Sep - 07 Oct	Aer Lingus
29 Sep - 08 Oct	Aer Lingus

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 $387

Return flights