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

Return flights

12 Sep - 10 Oct	Air France
15 Sep - 01 Oct	Air France
18 Sep - 01 Oct	Air France
18 Sep - 14 Oct	Lufthansa
17 Sep - 30 Sep	Eurowings
11 Sep - 25 Sep	Air France
22 Sep - 06 Oct	Ryanair
07 Sep - 21 Sep	Eurowings
08 Sep - 06 Oct	KLM
20 Sep - 04 Oct	Eurowings
16 Sep - 26 Sep	Ryanair
20 Sep - 24 Sep	Eurowings
27 Sep - 04 Oct	Eurowings
09 Sep - 16 Sep	easyJet
11 Sep - 18 Sep	Air France
13 Sep - 03 Oct	Ryanair
13 Sep - 20 Sep	Lufthansa

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 $646

Return flights