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

Return flights

17 Sep - 27 Sep	Air France
04 Sep - 18 Sep	Air France
17 Sep - 30 Sep	Air France
07 Sep - 27 Sep	Air France
11 Sep - 18 Sep	Air France
11 Sep - 21 Sep	Air France
01 Sep - 28 Sep	Air France
02 Sep - 15 Sep	Air Transat
04 Sep - 14 Sep	Air France
19 Sep - 03 Oct	Air France
04 Sep - 13 Sep	Norse Atlantic Airways (UK)
21 Sep - 05 Oct	Air Transat
25 Sep - 11 Oct	Wizz Air UK

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 $848

Return flights