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

Return flights

11 Sep - 21 Sep	Air Canada
19 Sep - 13 Oct	SWISS
18 Sep - 13 Oct	SWISS
05 Sep - 19 Sep	SWISS
11 Sep - 20 Sep	Norse Atlantic Airways
11 Sep - 29 Sep	Norse Atlantic Airways
11 Sep - 15 Sep	Norse Atlantic Airways
21 Sep - 18 Oct	Air France

Also check the deals for one-way flights from Athens 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 Athens to San Jose in September from $615

Return flights