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

Return flights

10 Sep - 24 Sep	Finnair
11 Sep - 20 Sep	Finnair
18 Sep - 03 Oct	Finnair
21 Sep - 02 Oct	Finnair
19 Sep - 03 Oct	Finnair
05 Sep - 31 Oct	Lufthansa
01 Sep - 16 Sep	Air Canada
04 Sep - 18 Sep	SWISS
04 Sep - 20 Sep	SWISS
05 Sep - 26 Sep	Lufthansa
05 Sep - 19 Sep	Lufthansa
28 Sep - 10 Oct	Air Canada
01 Sep - 14 Sep	Avianca
02 Sep - 14 Sep	Avianca
02 Sep - 15 Sep	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 586€

Return flights