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

Return flights

10 Sep - 22 Sep	jetBlue
02 Sep - 16 Sep	jetBlue
17 Sep - 21 Sep	jetBlue
03 Sep - 10 Sep	jetBlue
02 Sep - 20 Sep	jetBlue
16 Sep - 23 Sep	jetBlue
02 Sep - 07 Sep	jetBlue
15 Sep - 22 Sep	jetBlue
09 Sep - 16 Sep	jetBlue
25 Sep - 31 Oct	Air France
10 Sep - 14 Sep	jetBlue
10 Sep - 01 Oct	jetBlue
15 Sep - 13 Oct	jetBlue
18 Sep - 04 Oct	Lufthansa
11 Sep - 16 Oct	SWISS
18 Sep - 02 Oct	Lufthansa
10 Sep - 14 Oct	jetBlue
30 Sep - 17 Oct	jetBlue
01 Sep - 20 Oct	jetBlue
26 Sep - 10 Oct	Air Canada

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 549€

Return flights