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

Return flights

04 Sep - 07 Oct	SWISS
16 Sep - 07 Oct	SWISS
18 Sep - 02 Oct	Air Canada
11 Sep - 02 Oct	Air Canada
11 Sep - 24 Sep	Lufthansa
11 Sep - 01 Oct	Lufthansa
10 Sep - 25 Sep	Air France
10 Sep - 24 Sep	Air France
11 Sep - 25 Sep	Air France
03 Sep - 10 Sep	Air France
12 Sep - 20 Sep	Air France
03 Sep - 24 Sep	Air France
04 Sep - 25 Sep	Air France
18 Sep - 28 Sep	Air France
12 Sep - 25 Sep	Air France
25 Sep - 11 Oct	Air France
25 Sep - 05 Oct	Air France
17 Sep - 01 Oct	Air France
16 Sep - 03 Oct	Air Canada
19 Sep - 03 Oct	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 $584

Return flights