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

Return flights

29 Sep - 19 Oct	Air India
30 Sep - 31 Oct	Air India
23 Sep - 29 Oct	Air India
26 Sep - 03 Oct	Air India
29 Sep - 06 Oct	Air India
19 Sep - 26 Sep	Air India
29 Sep - 02 Oct	Air India
27 Sep - 30 Sep	Air India
26 Sep - 29 Sep	Air India
30 Sep - 03 Oct	Air India
26 Sep - 11 Oct	Air India
24 Sep - 02 Oct	Cathay Pacific
24 Sep - 03 Oct	Cathay Pacific
18 Sep - 25 Sep	Delta
21 Sep - 30 Sep	Delta
21 Sep - 28 Sep	Delta
20 Sep - 27 Sep	Cathay Pacific

Also check the deals for one-way flights from San Francisco to Bangalore 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 San Francisco to Bangalore in September from $604

Return flights