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

Return flights

18 Sep - 29 Sep	Saudia
09 Sep - 27 Sep	Saudia
21 Sep - 29 Sep	Saudia
14 Sep - 29 Sep	Saudia
16 Sep - 01 Oct	Saudia
23 Sep - 09 Oct	Saudia
23 Sep - 02 Oct	Saudia
05 Sep - 03 Oct	Saudia
12 Sep - 27 Oct	Saudia
30 Sep - 05 Oct	Saudia
07 Sep - 01 Oct	Saudia
14 Sep - 07 Oct	Saudia
09 Sep - 02 Oct	Saudia
04 Sep - 03 Oct	Saudia
20 Sep - 27 Sep	Saudia
13 Sep - 15 Sep	Saudia
13 Sep - 25 Sep	British Airways
13 Sep - 29 Sep	British Airways
16 Sep - 26 Sep	Eurowings
24 Sep - 28 Sep	Vueling Airlines

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 $466

Return flights