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

Return flights

24 Sep - 07 Oct	Eurowings
24 Sep - 06 Oct	Eurowings
22 Sep - 12 Oct	Aegean Airlines
29 Sep - 07 Oct	KLM
30 Sep - 08 Oct	KLM
30 Sep - 09 Oct	KLM
29 Sep - 28 Oct	KLM
29 Sep - 13 Oct	KLM
30 Sep - 07 Oct	KLM
29 Sep - 20 Oct	KLM
22 Sep - 30 Sep	Aegean Airlines
24 Sep - 29 Sep	Air France
24 Sep - 30 Sep	Air France
23 Sep - 29 Sep	Etihad Airways
26 Sep - 29 Sep	IndiGo
23 Sep - 28 Sep	Vueling Airlines
24 Sep - 28 Sep	IndiGo
25 Sep - 28 Sep	IndiGo
23 Sep - 26 Sep	Air India
22 Sep - 26 Sep	Air India

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 $523

Return flights