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

Return flights

17 Sep - 29 Sep	SWISS
01 Sep - 30 Sep	KLM
28 Sep - 05 Oct	Avianca
16 Sep - 03 Oct	Air Canada
01 Sep - 06 Sep	Air Canada
06 Sep - 19 Sep	Air Canada
01 Sep - 09 Sep	Air Canada
04 Sep - 13 Sep	Air Canada
05 Sep - 19 Sep	Air Canada
04 Sep - 18 Sep	Air Canada
11 Sep - 26 Sep	Air France
07 Sep - 18 Sep	Air Canada
29 Sep - 04 Oct	Air France
16 Sep - 28 Oct	Air France

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 $809

Return flights