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

One-Way flights

05 Sep	Air India
19 Sep	Air India
08 Sep	Air India
29 Sep	Air India
11 Sep	Air India
30 Sep	Vietnam Airlines
23 Sep	Air India	direct
19 Sep	Air India	direct
21 Sep	Air India	direct
29 Sep	Air India	direct

Also check the deals for return 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 one-way flights from Delhi to San Francisco in September from $397

One-Way flights