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

Return flights

02 Dec - 25 Dec	SWISS
07 Dec - 25 Dec	Air France
10 Dec - 23 Dec	KLM
05 Dec - 23 Dec	KLM
08 Dec - 23 Dec	KLM
04 Dec - 23 Dec	KLM
08 Dec - 27 Dec	KLM
02 Dec - 09 Dec	Air Canada
03 Dec - 09 Dec	Air Canada
09 Dec - 27 Dec	Air Canada
07 Dec - 25 Jan	Air Canada
06 Dec - 24 Jan	Air Canada
11 Dec - 15 Jan	United
04 Dec - 15 Jan	Ryanair
12 Dec - 15 Jan	Ryanair
03 Dec - 13 Jan	Ryanair
16 Dec - 17 Jan	United
04 Dec - 17 Jan	KLM
16 Dec - 13 Jan	United
06 Dec - 11 Jan	Ryanair

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 560€

Return flights