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

Return flights

11 Sep - 02 Oct	Ryanair
10 Sep - 19 Sep	Fly Play
20 Sep - 27 Sep	Ryanair
04 Sep - 20 Sep	Ryanair
17 Sep - 21 Sep	Fly Play
10 Sep - 30 Sep	Ryanair
01 Sep - 14 Sep	Ryanair
22 Sep - 30 Sep	Ryanair
11 Sep - 25 Sep	Ryanair
03 Sep - 14 Sep	Ryanair
07 Sep - 15 Sep	Ryanair
25 Sep - 11 Oct	Ryanair
22 Sep - 05 Oct	Ryanair
20 Sep - 04 Oct	Ryanair
06 Sep - 04 Oct	Ryanair
28 Sep - 04 Oct	Ryanair
20 Sep - 11 Oct	Ryanair
12 Sep - 12 Oct	Ryanair

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