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

Return flights

01 Sep - 12 Oct	Air France
06 Sep - 23 Sep	Air France
01 Sep - 19 Sep	Air France
09 Sep - 26 Sep	KLM
05 Sep - 19 Sep	Air France
01 Sep - 15 Sep	Air France
14 Sep - 30 Sep	Air France
01 Sep - 24 Sep	Lufthansa
01 Sep - 30 Sep	Aer Lingus
17 Sep - 30 Sep	Finnair
25 Sep - 12 Oct	Air France
03 Sep - 17 Sep	Finnair
26 Sep - 08 Oct	Finnair

Also check the deals for one-way flights from Duesseldorf 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 Duesseldorf to San Jose in September from $753

Return flights