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

Return flights

15 Dec - 22 Dec	SWISS
01 Dec - 10 Dec	Air Canada
01 Dec - 20 Dec	Air Canada
01 Dec - 15 Dec	SWISS
03 Dec - 18 Dec	Air Canada
10 Dec - 20 Dec	Air Canada
05 Dec - 21 Dec	Lufthansa
04 Dec - 23 Dec	SWISS
04 Dec - 15 Dec	Air Canada
04 Dec - 18 Dec	Air Canada
18 Dec - 02 Jan	Air Canada
31 Dec - 08 Jan	Air Transat
05 Dec - 03 Jan	SWISS
10 Dec - 02 Jan	Air Canada
17 Dec - 05 Jan	British Airways
22 Dec - 05 Jan	British Airways
30 Dec - 06 Jan	SWISS
17 Dec - 01 Jan	British Airways
19 Dec - 01 Jan	British Airways
15 Dec - 01 Jan	Air Canada

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 665€

Return flights