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

Return flights

19 Jan - 25 Jan	KLM
19 Jan - 04 Feb	Delta
20 Jan - 03 Feb	SWISS
15 Jan - 25 Jan	Delta
28 Jan - 03 Feb	KLM
23 Jan - 03 Feb	KLM
06 Jan - 20 Jan	KLM
19 Jan - 02 Feb	KLM
13 Jan - 03 Feb	KLM
20 Jan - 05 Feb	SWISS
27 Jan - 10 Feb	SWISS
13 Jan - 27 Jan	KLM
27 Jan - 17 Feb	KLM
12 Jan - 02 Feb	KLM
12 Jan - 27 Jan	SWISS
01 Jan - 13 Jan	SWISS
02 Jan - 12 Jan	KLM
05 Jan - 11 Jan	KLM
02 Jan - 04 Jan	KLM
15 Jan - 15 Jan	Lufthansa

Also check the deals for one-way flights from London to San Jose in January.

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 January from $948

Return flights