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

Return flights

05 Sep - 26 Sep	Air France
10 Sep - 24 Sep	Air France
04 Sep - 24 Sep	Air France
11 Sep - 27 Sep	Air France
19 Sep - 27 Sep	Air France
12 Sep - 25 Sep	Air France
12 Sep - 27 Sep	Air France
03 Sep - 29 Sep	Air France
18 Sep - 25 Sep	Air France
12 Sep - 04 Oct	Air France
18 Sep - 10 Oct	Air France
18 Sep - 04 Oct	Air France
18 Sep - 09 Oct	Air France
25 Sep - 04 Oct	Air France
25 Sep - 11 Oct	Air France
25 Sep - 18 Oct	Air France
12 Sep - 02 Oct	Air France
18 Sep - 11 Oct	Air France
10 Sep - 02 Oct	Air France
11 Sep - 24 Sep	Air France

Also check the deals for one-way flights from Frankfurt to San Jose 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 Frankfurt to San Jose in September from 524€

Return flights