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

Return flights

30 Sep - 21 Oct	jetBlue
09 Sep - 25 Sep	Air France
28 Sep - 09 Oct	Air France
16 Sep - 27 Sep	Air France
13 Sep - 27 Sep	Air France
30 Sep - 11 Oct	Air France
01 Sep - 15 Oct	KLM
02 Sep - 16 Oct	Air France
01 Sep - 20 Oct	KLM
02 Sep - 21 Oct	Air France
11 Sep - 18 Oct	Air France
02 Sep - 25 Sep	Air France
02 Sep - 09 Sep	Air France
02 Sep - 30 Sep	Air France
04 Sep - 16 Sep	Air France
25 Sep - 16 Oct	Lufthansa	direct
09 Sep - 25 Sep	Lufthansa	direct
02 Sep - 25 Sep	Lufthansa	direct
04 Sep - 16 Sep	Lufthansa	direct
02 Sep - 16 Oct	Lufthansa	direct

Also check the deals for one-way flights from San Jose 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 Jose to Frankfurt in September from $810

Return flights