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

Return flights

08 Dec - 24 Dec	KLM
02 Dec - 23 Dec	SWISS
08 Dec - 23 Dec	KLM
09 Dec - 23 Dec	KLM
09 Dec - 25 Dec	KLM
11 Dec - 25 Dec	Air Canada
03 Dec - 26 Dec	Air Canada
04 Dec - 25 Dec	Air Canada
02 Dec - 09 Dec	Air Canada
02 Dec - 25 Dec	Air Canada
11 Dec - 20 Jan	Air Canada
11 Dec - 13 Jan	Air Canada
05 Dec - 13 Jan	United
31 Dec - 17 Jan	United
08 Dec - 12 Jan	KLM
25 Dec - 17 Jan	United
29 Dec - 22 Jan	United
25 Dec - 24 Jan	United
25 Dec - 13 Jan	United
06 Dec - 08 Jan	United

Also check the deals for one-way flights from Frankfurt 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 Frankfurt to San Jose in December from $629

Return flights