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

Return flights

04 Sep - 09 Sep	SWISS
04 Sep - 12 Sep	SWISS
04 Sep - 18 Sep	SWISS
03 Sep - 18 Sep	SWISS
10 Sep - 23 Sep	SWISS
08 Sep - 18 Sep	Lufthansa
08 Sep - 26 Sep	Lufthansa
01 Sep - 30 Sep	Lufthansa
01 Sep - 16 Sep	Lufthansa
05 Sep - 18 Sep	Avianca
19 Sep - 03 Oct	Avianca
24 Sep - 08 Oct	Avianca
28 Sep - 12 Oct	Avianca

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 663€

Return flights