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

Return flights

08 Sep - 24 Sep	TAP
22 Sep - 22 Oct	TAP
08 Sep - 23 Sep	TAP
04 Sep - 18 Sep	TAP
09 Sep - 23 Sep	TAP
04 Sep - 15 Sep	TAP
15 Sep - 25 Sep	TAP
03 Sep - 12 Sep	TAP
14 Sep - 24 Sep	TAP
22 Sep - 01 Oct	TAP
04 Sep - 11 Sep	TAP
02 Sep - 09 Sep	TAP
23 Sep - 07 Oct	TAP
25 Sep - 09 Oct	TAP
09 Sep - 16 Oct	TAP
01 Sep - 01 Oct	TAP
19 Sep - 07 Oct	Air Canada
19 Sep - 06 Oct	Air Canada
19 Sep - 21 Oct	Air Canada
23 Sep - 14 Oct	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 $363

Return flights