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	Lufthansa
01 Sep - 01 Oct	Lufthansa
15 Sep - 15 Oct	Lufthansa
01 Sep - 17 Sep	Lufthansa
10 Sep - 28 Sep	SWISS
05 Sep - 22 Sep	SWISS
09 Sep - 23 Sep	Lufthansa
18 Sep - 04 Oct	Lufthansa
21 Sep - 01 Oct	KLM
12 Sep - 08 Oct	Lufthansa
04 Sep - 22 Sep	KLM
27 Sep - 11 Oct	SWISS
22 Sep - 02 Oct	SWISS
26 Sep - 11 Oct	KLM
16 Sep - 30 Sep	SWISS
18 Sep - 21 Sep	SWISS
11 Sep - 22 Sep	SWISS
09 Sep - 16 Sep	Lufthansa
18 Sep - 02 Oct	Lufthansa
27 Sep - 08 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 650€

Return flights