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

Return flights

23 Sep - 27 Sep	KLM
02 Sep - 15 Sep	Lufthansa
18 Sep - 01 Oct	Lufthansa
18 Sep - 04 Oct	KLM
20 Sep - 30 Sep	Iberia
14 Sep - 21 Sep	Lufthansa
01 Sep - 20 Sep	Iberia
05 Sep - 15 Sep	KLM
08 Sep - 13 Sep	Lufthansa
17 Sep - 22 Sep	KLM
12 Sep - 26 Sep	KLM
01 Sep - 16 Sep	Iberia
21 Sep - 12 Oct	Iberia
21 Sep - 05 Oct	Iberia
18 Sep - 03 Oct	Lufthansa

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 817€

Return flights