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

Return flights

31 Dec - 16 Jan	British Airways
10 Dec - 15 Dec	British Airways
09 Dec - 16 Dec	British Airways
01 Dec - 08 Dec	British Airways
02 Dec - 12 Dec	British Airways
09 Dec - 14 Dec	British Airways
11 Dec - 17 Dec	Iberia
05 Dec - 11 Jan	British Airways
11 Dec - 16 Dec	British Airways
26 Dec - 31 Jan	Iberia
25 Dec - 08 Jan	British Airways
15 Dec - 22 Dec	British Airways
11 Dec - 25 Dec	British Airways
25 Dec - 10 Jan	British Airways
28 Dec - 11 Jan	British Airways
26 Dec - 17 Jan	Iberia
13 Dec - 21 Dec	British Airways
19 Dec - 19 Jan	Alaska Airlines
20 Dec - 20 Jan	British Airways
19 Dec - 20 Jan	Alaska Airlines

Also check the deals for one-way flights from San Jose to Athens 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 San Jose to Athens in December from $616

Return flights