AirHint found the following cheapest return flights from San Jose (SJC) to London (LHR) in December 2025 (see full year).

Return flights

04 Dec - 11 Dec	Air Canada
02 Dec - 09 Dec	British Airways
08 Dec - 16 Dec	British Airways
05 Dec - 12 Dec	British Airways
31 Dec - 24 Jan	British Airways
05 Dec - 14 Dec	British Airways
06 Dec - 14 Dec	British Airways
05 Dec - 07 Dec	British Airways
04 Dec - 07 Dec	British Airways
11 Dec - 26 Dec	British Airways
16 Dec - 24 Dec	Delta
23 Dec - 13 Jan	British Airways
25 Dec - 06 Jan	KLM
11 Dec - 10 Jan	British Airways
15 Dec - 10 Jan	Lufthansa
31 Dec - 11 Jan	British Airways
16 Dec - 10 Jan	British Airways
24 Dec - 17 Jan	Finnair
13 Dec - 09 Jan	Lufthansa
25 Dec - 05 Jan	Frontier Airlines

Also check the deals for one-way flights from San Jose to London 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 London in December from $614

Return flights