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

Return flights

28 Aug - 07 Sep	SWISS
29 Aug - 14 Sep	KLM
22 Aug - 14 Sep	KLM
31 Aug - 14 Sep	Delta
28 Aug - 04 Sep	Delta
30 Aug - 14 Sep	KLM
19 Aug - 27 Aug	SWISS
14 Aug - 17 Aug	SWISS
07 Aug - 17 Aug	SWISS
07 Aug - 20 Aug	SWISS
30 Aug - 08 Sep	Delta
30 Aug - 07 Sep	Delta
30 Aug - 13 Sep	KLM
22 Aug - 06 Sep	KLM
18 Aug - 28 Aug	Delta
22 Aug - 30 Aug	KLM
05 Aug - 17 Aug	SWISS
16 Aug - 30 Aug	KLM
07 Aug - 23 Aug	SWISS
19 Aug - 31 Aug	Delta

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 $1004

Return flights