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

Return flights

21 Sep - 07 Oct	Condor
16 Sep - 07 Oct	Condor
24 Sep - 15 Oct	Condor	direct
16 Sep - 17 Oct	Condor
12 Sep - 25 Sep	Condor
21 Sep - 07 Oct	Condor	direct
16 Sep - 07 Oct	Condor	direct
15 Sep - 01 Oct	Condor	direct
25 Sep - 29 Sep	Condor
30 Sep - 06 Oct	Condor	direct
29 Sep - 25 Oct	Condor
10 Sep - 24 Sep	Condor	direct
29 Sep - 13 Oct	TAP
13 Sep - 20 Sep	Condor
12 Sep - 25 Sep	Condor	direct
13 Sep - 23 Sep	Condor
11 Sep - 15 Sep	Condor	direct
10 Sep - 15 Sep	Condor
10 Sep - 15 Sep	Condor	direct
10 Sep - 14 Sep	Condor	direct

Also check the deals for one-way flights from San Francisco to Frankfurt 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 Frankfurt in September from 495€

Return flights