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

Return flights

03 Sep - 09 Sep	Air Canada
29 Sep - 07 Oct	TAP
03 Sep - 16 Sep	Air Canada
03 Sep - 11 Sep	Air Canada
11 Sep - 17 Sep	TAP
01 Sep - 10 Sep	Air Canada
01 Sep - 15 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
25 Sep - 01 Oct	TAP
25 Sep - 30 Sep	TAP
25 Sep - 29 Sep	TAP
30 Sep - 08 Oct	Air Canada
17 Sep - 24 Sep	TAP
24 Sep - 01 Oct	TAP
17 Sep - 01 Oct	TAP
26 Sep - 04 Oct	TAP
27 Sep - 01 Oct	Icelandair
26 Sep - 05 Oct	TAP
29 Sep - 05 Oct	TAP
30 Sep - 03 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 $438

Return flights