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

Return flights

15 Sep - 27 Sep	KLM
23 Sep - 27 Sep	KLM
04 Sep - 24 Sep	KLM
01 Sep - 29 Sep	KLM
04 Sep - 25 Sep	KLM
03 Sep - 25 Sep	KLM
03 Sep - 27 Sep	KLM
11 Sep - 24 Sep	KLM
18 Sep - 25 Sep	KLM
01 Sep - 27 Sep	KLM
22 Sep - 22 Oct	KLM
18 Sep - 03 Oct	KLM
25 Sep - 05 Oct	KLM
02 Sep - 03 Oct	KLM
18 Sep - 20 Oct	KLM
21 Sep - 12 Oct	KLM
15 Sep - 08 Oct	KLM
04 Sep - 15 Oct	KLM
18 Sep - 12 Oct	KLM
22 Sep - 13 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 $561

Return flights