AirHint found the following cheapest return flights from London (LHR) to San Jose (SJO) in September 2025 (see full year).

Return flights

01 Sep - 08 Sep	jetBlue
01 Sep - 15 Sep	jetBlue
01 Sep - 29 Sep	jetBlue
09 Sep - 23 Sep	jetBlue
02 Sep - 14 Sep	jetBlue
08 Sep - 22 Sep	jetBlue
09 Sep - 20 Sep	jetBlue
09 Sep - 22 Sep	jetBlue
01 Sep - 19 Sep	jetBlue
07 Sep - 05 Oct	jetBlue
06 Sep - 23 Sep	jetBlue
22 Sep - 02 Oct	Aer Lingus
30 Sep - 14 Oct	jetBlue
06 Sep - 12 Oct	jetBlue
24 Sep - 22 Oct	Air France
29 Sep - 06 Oct	Air France
29 Sep - 11 Oct	Air France
09 Sep - 07 Oct	SWISS
26 Sep - 11 Oct	Air Canada
20 Sep - 04 Oct	jetBlue

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 559€

Return flights