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

Return flights

03 Sep - 10 Sep	Air Canada
01 Sep - 08 Sep	Air Canada
09 Sep - 16 Sep	United
22 Sep - 15 Oct	Turkish Airlines
24 Sep - 01 Oct	United
30 Sep - 07 Oct	United
06 Sep - 13 Sep	United
15 Sep - 22 Sep	United
12 Sep - 19 Sep	United
18 Sep - 25 Sep	United
27 Sep - 04 Oct	United
18 Sep - 27 Sep	Delta

Also check the deals for one-way flights from San Francisco to Bucharest 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 Bucharest in September from 558€

Return flights