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

Return flights

28 Sep - 29 Oct	Etihad Airways
28 Sep - 05 Oct	Kuwait Airways
24 Sep - 07 Oct	Air India
23 Sep - 20 Oct	Air India
23 Sep - 23 Sep	Air India	direct
22 Sep - 02 Oct	Air India	direct
25 Sep - 02 Oct	Air India	direct
22 Sep - 01 Oct	Air India	direct
24 Sep - 01 Oct	Air India	direct
25 Sep - 07 Oct	Air India	direct
29 Sep - 29 Oct	Air India	direct
25 Sep - 29 Sep	Air India
23 Sep - 30 Sep	Air India
22 Sep - 30 Sep	Air India
24 Sep - 30 Sep	Air India
25 Sep - 30 Sep	Air India
22 Sep - 29 Sep	Air India
21 Sep - 24 Sep	Air India
12 Sep - 28 Sep	Etihad Airways
24 Sep - 28 Sep	Finnair

Also check the deals for one-way flights from Delhi 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 Delhi to London in September from $544

Return flights