AirHint found the following cheapest return flights from Oakland (OAK) to Istanbul (IST) in September 2025 (see full year).

Return flights

03 Sep - 27 Sep	Spirit Airlines
01 Sep - 06 Oct	Spirit Airlines
04 Sep - 10 Sep	Qatar Airways
11 Sep - 18 Sep	Qatar Airways
03 Sep - 16 Sep	Qatar Airways
11 Sep - 22 Sep	Qatar Airways
16 Sep - 30 Sep	Qatar Airways
10 Sep - 15 Sep	Qatar Airways
30 Sep - 20 Oct	Qatar Airways
15 Sep - 29 Sep	Qatar Airways
01 Sep - 15 Sep	Qatar Airways
05 Sep - 10 Sep	Qatar Airways
28 Sep - 05 Oct	Qatar Airways
18 Sep - 11 Oct	Qatar Airways
17 Sep - 11 Oct	Qatar Airways
16 Sep - 11 Oct	Qatar Airways
08 Sep - 04 Oct	Qatar Airways
14 Sep - 04 Oct	Qatar Airways
24 Sep - 11 Oct	Qatar Airways
18 Sep - 04 Oct	Qatar Airways

Also check the deals for one-way flights from Oakland to Istanbul 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 Oakland to Istanbul in September from $854

Return flights