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

Return flights

04 Dec - 11 Dec	Air France
02 Dec - 09 Dec	KLM
20 Dec - 09 Jan	KLM
20 Dec - 08 Jan	KLM
24 Dec - 08 Jan	Air France
16 Dec - 09 Jan	KLM
27 Dec - 11 Jan	KLM
25 Dec - 10 Jan	Air France
23 Dec - 12 Jan	KLM
23 Dec - 10 Jan	KLM
23 Dec - 09 Jan	KLM
23 Dec - 08 Jan	Air France
01 Dec - 16 Dec	KLM
02 Dec - 16 Dec	KLM
01 Dec - 19 Dec	KLM
19 Dec - 30 Dec	Air France
06 Dec - 28 Dec	KLM
20 Dec - 30 Dec	Air France
11 Dec - 23 Dec	KLM
16 Dec - 27 Dec	KLM

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 $731

Return flights