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

Return flights

23 Sep - 01 Oct	Air Canada
30 Sep - 05 Oct	Aer Lingus
29 Sep - 05 Oct	Aer Lingus
26 Sep - 14 Oct	Aer Lingus
15 Sep - 22 Sep	Aer Lingus
26 Sep - 05 Oct	Aer Lingus
30 Sep - 07 Oct	Aer Lingus
15 Sep - 24 Sep	Air Canada
08 Sep - 16 Oct	TAP
25 Sep - 05 Oct	Aer Lingus
23 Sep - 27 Sep	Air Canada
23 Sep - 07 Oct	SWISS
04 Sep - 11 Sep	FrenchBee
09 Sep - 14 Sep	SWISS
04 Sep - 09 Sep	Icelandair
27 Sep - 05 Oct	Spirit Airlines
08 Sep - 10 Sep	Icelandair
08 Sep - 12 Sep	Spirit Airlines
11 Sep - 15 Sep	Spirit Airlines
04 Sep - 08 Sep	SWISS

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Newark to London in September from 338€

Return flights