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

Return flights

16 Sep - 22 Sep	TAP
04 Sep - 18 Sep	FrenchBee
04 Sep - 11 Sep	FrenchBee
06 Sep - 10 Sep	FrenchBee
25 Sep - 05 Oct	TAP
13 Sep - 17 Sep	TAP
02 Sep - 05 Sep	FrenchBee
07 Sep - 16 Sep	Aer Lingus
08 Sep - 16 Sep	FrenchBee
04 Sep - 09 Sep	FrenchBee
24 Sep - 14 Oct	FrenchBee
04 Sep - 21 Sep	FrenchBee
25 Sep - 15 Oct	FrenchBee
29 Sep - 09 Oct	Spirit Airlines
30 Sep - 07 Oct	Air Canada
24 Sep - 01 Oct	Aer Lingus
23 Sep - 21 Oct	TAP
17 Sep - 17 Oct	Icelandair
15 Sep - 13 Oct	TAP
26 Sep - 07 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 324€

Return flights