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

Return flights

13 Sep - 20 Sep	Air India
18 Sep - 22 Sep	Air India
04 Sep - 16 Sep	Air India
30 Sep - 30 Oct	Vietnam Airlines
08 Sep - 22 Sep	Air India
03 Sep - 10 Sep	Air India
15 Sep - 30 Sep	Air India
03 Sep - 17 Sep	Air India
11 Sep - 05 Oct	Air India
11 Sep - 09 Oct	Air India
02 Sep - 09 Sep	Air India
04 Sep - 04 Oct	Air India
01 Sep - 05 Sep	Air India
15 Sep - 12 Oct	Air India
27 Sep - 04 Oct	Air India
24 Sep - 11 Oct	Air India
06 Sep - 21 Sep	Vietnam Airlines
07 Sep - 07 Oct	Air India
25 Sep - 06 Oct	Air India	direct
17 Sep - 06 Oct	Air India

Also check the deals for one-way flights from Delhi 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 Delhi to San Francisco in September from $618

Return flights