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

Return flights

10 Sep - 23 Sep	KLM
21 Sep - 05 Oct	KLM
03 Sep - 24 Sep	KLM
01 Sep - 18 Sep	KLM
03 Sep - 21 Sep	KLM
02 Sep - 21 Sep	KLM
02 Sep - 30 Sep	KLM
17 Sep - 26 Sep	KLM
07 Sep - 25 Sep	KLM
24 Sep - 14 Oct	KLM
21 Sep - 18 Oct	KLM
03 Sep - 18 Sep	Air France
17 Sep - 25 Sep	Air France
09 Sep - 10 Oct	Air France
14 Sep - 14 Oct	Air France
03 Sep - 02 Oct	Air France
29 Sep - 27 Oct	Air France
30 Sep - 05 Oct	Air France
10 Sep - 02 Oct	Air France
22 Sep - 03 Oct	Air France

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 436€

Return flights