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

Return flights

25 Sep - 09 Oct	Air India
21 Sep - 07 Oct	Air India
21 Sep - 28 Oct	Air India
24 Sep - 28 Oct	Air India
29 Sep - 24 Oct	Air India
29 Sep - 06 Oct	Air India
30 Sep - 07 Oct	Air India
28 Sep - 01 Oct	Air India
28 Sep - 04 Oct	Air India
29 Sep - 13 Oct	Air India
23 Sep - 28 Sep	Air India
21 Sep - 28 Sep	Air India
23 Sep - 30 Sep	Air India
22 Sep - 29 Sep	Air India
20 Sep - 27 Sep	Air India

Also check the deals for one-way flights from Bangalore 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 Bangalore to San Francisco in September from 633€

Return flights