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

Return flights

18 Sep - 03 Oct	SWISS
01 Sep - 11 Sep	SWISS
26 Sep - 03 Oct	Air Canada
04 Sep - 20 Sep	SWISS
10 Sep - 20 Sep	SWISS
19 Sep - 03 Oct	Air Canada
23 Sep - 03 Oct	Air Canada
02 Sep - 18 Sep	Air Canada
04 Sep - 08 Sep	Avianca
23 Sep - 24 Sep	Avianca
02 Sep - 14 Sep	Avianca
19 Sep - 26 Sep	Avianca
22 Sep - 03 Oct	Air Canada
11 Sep - 26 Sep	Avianca
08 Sep - 22 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 639€

Return flights