AirHint found the following cheapest return flights from London (LCY) to San Jose (SJO) in December 2026 (see full year).

Return flights

03 Dec - 21 Jan	Air Dolomiti
04 Dec - 22 Dec	SWISS
15 Dec - 12 Jan	SWISS
01 Dec - 12 Dec	SWISS
01 Dec - 15 Dec	SWISS
10 Dec - 23 Dec	Air Dolomiti
10 Dec - 19 Dec	Lufthansa
15 Dec - 26 Dec	SWISS
29 Dec - 12 Jan	SWISS
31 Dec - 14 Jan	KLM
29 Dec - 30 Jan	SWISS
15 Dec - 31 Dec	SWISS
06 Dec - 20 Dec	KLM
11 Dec - 25 Dec	KLM
30 Dec - 31 Jan	KLM
23 Dec - 10 Jan	Iberia
12 Dec - 29 Dec	KLM
15 Dec - 07 Jan	SWISS
23 Dec - 03 Jan	Iberia
29 Dec - 05 Jan	KLM

Also check the deals for one-way flights from London 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 London to San Jose in December from 745€

Return flights