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

Return flights

22 Sep - 27 Sep	Air Canada
23 Sep - 07 Oct	Aer Lingus
30 Sep - 06 Oct	SWISS
28 Sep - 02 Oct	Spirit Airlines
23 Sep - 29 Sep	Icelandair
22 Sep - 02 Oct	Icelandair
15 Sep - 22 Sep	Icelandair
30 Sep - 13 Oct	SWISS
15 Sep - 23 Oct	Icelandair
30 Sep - 09 Oct	Spirit Airlines
30 Sep - 16 Oct	Icelandair
24 Sep - 29 Sep	Icelandair
16 Sep - 23 Oct	Icelandair
16 Sep - 16 Oct	Icelandair
26 Sep - 29 Sep	Spirit Airlines
14 Sep - 15 Sep	Air Canada
15 Sep - 19 Sep	Icelandair
25 Sep - 29 Sep	Icelandair
19 Sep - 24 Sep	Air Canada
28 Sep - 29 Sep	Spirit Airlines

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 383€

Return flights