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

Return flights

19 Sep - 21 Oct	Saudia
19 Sep - 24 Oct	Saudia
18 Sep - 23 Oct	Saudia
09 Sep - 27 Sep	Saudia
11 Sep - 27 Sep	Saudia
20 Sep - 26 Sep	Saudia
12 Sep - 18 Sep	Saudia
27 Sep - 12 Oct	Saudia
25 Sep - 04 Oct	Saudia
02 Sep - 18 Sep	Saudia
04 Sep - 27 Sep	Saudia
06 Sep - 22 Sep	Saudia
05 Sep - 18 Sep	Saudia
14 Sep - 19 Sep	Saudia
16 Sep - 24 Sep	Saudia
20 Sep - 03 Oct	Saudia
21 Sep - 02 Oct	Saudia
24 Sep - 12 Oct	KLM
29 Sep - 30 Oct	KLM
16 Sep - 15 Oct	KLM

Also check the deals for one-way flights from London to Mumbai 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 London to Mumbai in September from $531

Return flights