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

Return flights

12 Sep - 15 Oct	Air France
12 Sep - 01 Oct	Air France
15 Sep - 24 Sep	Air France
09 Sep - 15 Oct	Air France
14 Sep - 09 Oct	Air France
17 Sep - 24 Sep	Air France
23 Sep - 14 Oct	SWISS
18 Sep - 02 Oct	Air France
24 Sep - 03 Oct	SWISS
18 Sep - 04 Oct	Air France
15 Sep - 29 Sep	Air France
23 Sep - 09 Oct	Air Canada
09 Sep - 24 Sep	Air France
10 Sep - 24 Sep	Air France
19 Sep - 05 Oct	Air Canada
18 Sep - 22 Sep	United
19 Sep - 23 Sep	United
16 Sep - 25 Sep	United
15 Sep - 22 Sep	United
15 Sep - 30 Sep	United

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 510€

Return flights