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

Return flights

24 Sep - 08 Oct	Condor
16 Sep - 24 Sep	Condor
08 Sep - 24 Sep	Condor
08 Sep - 10 Sep	Condor
09 Sep - 24 Sep	Air Canada
14 Sep - 26 Sep	Delta
29 Sep - 07 Oct	Condor
23 Sep - 08 Oct	Condor
16 Sep - 02 Oct	American Airlines
18 Sep - 24 Sep	Condor
08 Sep - 15 Sep	Condor
05 Sep - 25 Sep	Alaska Airlines
08 Sep - 04 Oct	Condor
05 Sep - 27 Sep	Frontier Airlines

Also check the deals for one-way flights from San Diego 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 Diego to Frankfurt in September from $580

Return flights