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

Return flights

08 Sep - 11 Sep	Scandinavian Airlines
09 Sep - 23 Sep	TAP
19 Sep - 21 Sep	United
22 Sep - 29 Oct	TAP
29 Sep - 14 Oct	TAP
23 Sep - 30 Sep	TAP
05 Sep - 09 Sep	Air Canada
22 Sep - 25 Sep	Scandinavian Airlines
13 Sep - 22 Sep	Lufthansa
08 Sep - 16 Oct	Air Canada
01 Sep - 15 Sep	Lufthansa
04 Sep - 11 Sep	Aer Lingus
21 Sep - 27 Sep	Lufthansa
30 Sep - 05 Oct	Lufthansa
28 Sep - 05 Oct	Aer Lingus
24 Sep - 12 Oct	Lufthansa	direct
24 Sep - 19 Oct	Lufthansa	direct
05 Sep - 05 Oct	Lufthansa	direct
28 Sep - 05 Oct	Lufthansa	direct
09 Sep - 01 Oct	TAP

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 358€

Return flights