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

Return flights

09 Sep - 14 Oct	SWISS
23 Sep - 16 Oct	SWISS
16 Sep - 14 Oct	SWISS
23 Sep - 28 Oct	SWISS
23 Sep - 11 Oct	Air Canada
18 Sep - 02 Oct	Air Canada
26 Sep - 11 Oct	Air Canada
11 Sep - 02 Oct	Air Canada
12 Sep - 02 Oct	Air Canada
20 Sep - 02 Oct	Air Canada
09 Sep - 26 Sep	Air Canada
11 Sep - 14 Sep	Air Canada
23 Sep - 27 Sep	Air Canada
16 Sep - 27 Sep	Air Canada
19 Sep - 26 Sep	Air Canada
11 Sep - 27 Sep	Air Canada
09 Sep - 21 Sep	Air Canada
12 Sep - 14 Sep	Air Canada
12 Sep - 19 Sep	Air Canada
12 Sep - 24 Sep	Air Canada

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 509€

Return flights