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

Return flights

25 Sep - 11 Oct	Air France
25 Sep - 10 Oct	Air France
11 Sep - 25 Sep	Air France
09 Sep - 30 Sep	SWISS
02 Sep - 14 Sep	SWISS
29 Sep - 16 Oct	KLM
12 Sep - 03 Oct	Air France
13 Sep - 26 Sep	KLM
25 Sep - 02 Oct	Lufthansa
25 Sep - 04 Oct	Air France
30 Sep - 11 Oct	Air France
01 Sep - 29 Sep	KLM
12 Sep - 04 Oct	Air France
09 Sep - 20 Sep	SWISS
13 Sep - 20 Sep	Lufthansa
01 Sep - 15 Sep	Air France
27 Sep - 18 Oct	KLM
27 Sep - 17 Oct	KLM

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 541€

Return flights