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

Return flights

22 Sep - 10 Oct	Air Canada
22 Sep - 08 Oct	Air Canada
17 Sep - 10 Oct	Air Canada
29 Sep - 10 Oct	Air Canada
28 Sep - 04 Oct	Air Canada
03 Sep - 17 Sep	SWISS
22 Sep - 08 Oct	Lufthansa	direct
05 Sep - 22 Sep	Air France
29 Sep - 17 Oct	Air Canada
08 Sep - 21 Sep	United
05 Sep - 26 Sep	Air France
06 Sep - 24 Sep	Air France
03 Sep - 20 Sep	KLM
04 Sep - 15 Sep	SWISS
07 Sep - 24 Sep	Iberia
19 Sep - 29 Sep	Iberia
19 Sep - 13 Oct	Iberia
01 Sep - 15 Sep	United
19 Sep - 13 Oct	Lufthansa	direct
22 Sep - 10 Oct	Lufthansa	direct

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 571€

Return flights