AirHint found the following cheapest return flights from London (LCY) to San Jose (SJO) in September 2026 (see full year).

Return flights

17 Sep - 29 Sep	Lufthansa
01 Sep - 15 Sep	KLM
10 Sep - 17 Sep	SWISS
01 Sep - 17 Sep	KLM
02 Sep - 15 Sep	KLM
16 Sep - 28 Oct	KLM
16 Sep - 03 Oct	KLM
23 Sep - 04 Oct	KLM
12 Sep - 26 Sep	KLM
01 Sep - 21 Sep	KLM
29 Sep - 04 Oct	KLM
01 Sep - 08 Sep	KLM
17 Sep - 30 Sep	Lufthansa
16 Sep - 30 Sep	SWISS
25 Sep - 04 Oct	Air Dolomiti

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 679€

Return flights