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

Return flights

17 Sep - 29 Oct	KLM
18 Sep - 22 Oct	KLM
29 Sep - 29 Oct	Air France
19 Sep - 19 Oct	Air France
22 Sep - 22 Oct	Air France
17 Sep - 24 Sep	KLM
23 Sep - 29 Sep	KLM
23 Sep - 23 Oct	KLM
17 Sep - 27 Oct	KLM
18 Sep - 22 Sep	KLM
18 Sep - 25 Sep	Delta
24 Sep - 02 Oct	Delta
23 Sep - 02 Oct	Delta
25 Sep - 06 Oct	Delta
26 Sep - 30 Sep	Delta
26 Sep - 28 Sep	Virgin Atlantic
20 Sep - 21 Sep	Delta
18 Sep - 26 Sep	Cathay Pacific
19 Sep - 26 Sep	Cathay Pacific
15 Sep - 19 Sep	Air France

Also check the deals for one-way flights from Mumbai to San Francisco 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 Mumbai to San Francisco in September from 587€

Return flights