AirHint found the following cheapest return flights from Brussels (BRU) to San Jose (SJO) in December 2025 (see full year).

Return flights

03 Dec - 24 Dec	SWISS
03 Dec - 26 Dec	SWISS
12 Dec - 09 Jan	United
16 Dec - 30 Jan	Brussels Airlines
15 Dec - 08 Jan	United
01 Dec - 08 Dec	SWISS
10 Dec - 24 Dec	SWISS
05 Dec - 12 Dec	United
05 Dec - 13 Dec	United
03 Dec - 25 Dec	SWISS
17 Dec - 29 Jan	Brussels Airlines
17 Dec - 30 Jan	Brussels Airlines
16 Dec - 29 Dec	Brussels Airlines
03 Dec - 23 Dec	Ryanair
18 Dec - 11 Jan	Brussels Airlines
15 Dec - 30 Jan	Ryanair
13 Dec - 24 Dec	United
30 Dec - 20 Jan	United
25 Dec - 16 Jan	United
29 Dec - 16 Jan	Aer Lingus

Also check the deals for one-way flights from Brussels to San Jose in December.

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 Brussels to San Jose in December from 495€

Return flights