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

Return flights

16 Sep - 30 Sep	Air Canada
26 Sep - 03 Oct	Lufthansa
17 Sep - 24 Sep	Virgin Atlantic
24 Sep - 29 Sep	SWISS
13 Sep - 20 Sep	Air Canada
18 Sep - 23 Sep	Air Canada
22 Sep - 29 Sep	Air Canada
17 Sep - 01 Oct	Virgin Atlantic
24 Sep - 28 Sep	Virgin Atlantic
26 Sep - 04 Oct	Brussels Airlines
28 Sep - 05 Oct	Air Canada
15 Sep - 27 Sep	Air Canada
22 Sep - 05 Oct	Virgin Atlantic
15 Sep - 22 Sep	Air Canada
25 Sep - 30 Sep	Air Canada
18 Sep - 04 Oct	Lufthansa
18 Sep - 02 Oct	Lufthansa
30 Sep - 23 Oct	SWISS
30 Sep - 08 Oct	SWISS
25 Sep - 05 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 584€

Return flights