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

Return flights

13 Dec - 03 Jan	KLM
02 Dec - 11 Dec	Air Canada
30 Dec - 31 Jan	KLM
23 Dec - 04 Jan	KLM
25 Dec - 06 Jan	KLM
25 Dec - 08 Jan	KLM
02 Dec - 11 Dec	Lufthansa	direct
12 Dec - 02 Jan	Air France
25 Dec - 08 Jan	Lufthansa	direct
25 Dec - 06 Jan	Lufthansa	direct
14 Dec - 21 Dec	Air France
30 Dec - 31 Jan	Lufthansa	direct
13 Dec - 03 Jan	Lufthansa	direct
13 Dec - 20 Dec	KLM
13 Dec - 20 Dec	Lufthansa	direct

Also check the deals for one-way flights from San Jose to Frankfurt 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 Frankfurt in December from $881

Return flights