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

Return flights

27 Aug - 07 Sep	jetBlue
20 Aug - 18 Sep	jetBlue
29 Aug - 13 Sep	jetBlue
30 Aug - 13 Sep	jetBlue
30 Aug - 07 Sep	jetBlue
31 Aug - 15 Sep	jetBlue
31 Aug - 08 Sep	jetBlue
27 Aug - 05 Sep	jetBlue
28 Aug - 07 Sep	Icelandair
28 Aug - 15 Sep	jetBlue
21 Aug - 28 Aug	SWISS
22 Aug - 31 Aug	SWISS
21 Aug - 26 Aug	SWISS
23 Aug - 31 Aug	SWISS
07 Aug - 22 Aug	Lufthansa
06 Aug - 25 Aug	Lufthansa
11 Aug - 22 Aug	Lufthansa
13 Aug - 20 Aug	Lufthansa
12 Aug - 26 Aug	Lufthansa
12 Aug - 22 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 598€

Return flights