AirHint found the following cheapest return flights from Frankfurt (FRA) to San Jose (SJO) in September 2026 (see full year).

Return flights

03 Sep - 18 Oct	Air France
05 Sep - 20 Oct	Air France
03 Sep - 26 Sep	Air France
19 Sep - 02 Oct	KLM
17 Sep - 07 Oct	KLM
15 Sep - 08 Oct	KLM
24 Sep - 08 Oct	KLM
03 Sep - 16 Sep	Air France
15 Sep - 08 Oct	Lufthansa	direct
24 Sep - 08 Oct	Lufthansa	direct
01 Sep - 22 Sep	Air Canada
15 Sep - 22 Sep	Air Canada
15 Sep - 29 Sep	Air Canada
22 Sep - 30 Sep	Air Canada
15 Sep - 26 Sep	Air Canada
01 Sep - 20 Sep	Air Canada
01 Sep - 24 Sep	KLM
10 Sep - 26 Sep	Air Canada
25 Sep - 09 Oct	Air Canada
19 Sep - 01 Oct	KLM

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 547€

Return flights