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

Return flights

29 Aug - 09 Sep	SWISS
28 Aug - 16 Sep	SWISS
25 Aug - 03 Sep	KLM
20 Aug - 03 Sep	Lufthansa
28 Aug - 04 Sep	Lufthansa
29 Aug - 08 Sep	KLM
28 Aug - 09 Sep	SWISS
28 Aug - 02 Sep	Lufthansa
28 Aug - 11 Sep	Lufthansa
26 Aug - 02 Sep	SWISS
16 Aug - 24 Aug	SWISS
20 Aug - 27 Aug	Lufthansa
19 Aug - 26 Aug	SWISS
16 Aug - 19 Aug	SWISS
16 Aug - 27 Aug	SWISS
23 Aug - 26 Aug	KLM
22 Aug - 25 Aug	KLM
19 Aug - 30 Aug	SWISS
21 Aug - 30 Aug	Lufthansa
20 Aug - 30 Aug	Lufthansa

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

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 August from 870€

Return flights