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

Return flights

18 Sep - 24 Sep	SWISS
15 Sep - 23 Sep	Lufthansa
23 Sep - 29 Sep	SWISS
17 Sep - 24 Sep	Lufthansa
22 Sep - 11 Oct	Virgin Atlantic
11 Sep - 21 Sep	ITA Airways
15 Sep - 22 Sep	KLM
16 Sep - 07 Oct	SWISS
16 Sep - 04 Oct	SWISS
09 Sep - 17 Sep	Lufthansa
26 Sep - 12 Oct	Lufthansa
14 Sep - 20 Sep	KLM
22 Sep - 29 Sep	Lufthansa
18 Sep - 04 Oct	SWISS
26 Sep - 27 Sep	Virgin Atlantic
18 Sep - 02 Oct	SWISS
11 Sep - 09 Oct	Lufthansa
24 Sep - 04 Oct	SWISS
22 Sep - 13 Oct	SWISS
20 Sep - 01 Oct	SWISS

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

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 September from 674€

Return flights