AirHint found the following cheapest return flights from London (LHR) to Mumbai (BOM) in September 2026 (see full year).

Return flights

21 Sep - 28 Sep	KLM
02 Sep - 23 Sep	KLM
07 Sep - 24 Sep	KLM
22 Sep - 29 Sep	KLM
01 Sep - 30 Sep	KLM
30 Sep - 21 Oct	KLM
01 Sep - 01 Oct	KLM
01 Sep - 05 Oct	KLM
01 Sep - 08 Oct	KLM
01 Sep - 12 Oct	KLM
01 Sep - 13 Oct	KLM
01 Sep - 14 Oct	KLM
01 Sep - 15 Oct	KLM
28 Sep - 07 Oct	KLM
01 Sep - 06 Oct	KLM
13 Sep - 27 Sep	KLM
12 Sep - 23 Sep	Air India
23 Sep - 28 Sep	IndiGo	direct
21 Sep - 28 Sep	IndiGo	direct
07 Sep - 24 Sep	IndiGo	direct

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 450€

Return flights