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

Return flights

17 Sep - 02 Oct	Ryanair
01 Sep - 29 Sep	Ryanair
23 Sep - 30 Sep	Ryanair
17 Sep - 21 Sep	Ryanair
10 Sep - 30 Sep	Ryanair
12 Sep - 26 Sep	Ryanair
25 Sep - 11 Oct	Ryanair
16 Sep - 30 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
06 Sep - 13 Sep	Ryanair
18 Sep - 28 Sep	Ryanair
03 Sep - 10 Sep	Ryanair
29 Sep - 11 Oct	Ryanair
22 Sep - 05 Oct	Ryanair
26 Sep - 05 Oct	Ryanair
22 Sep - 02 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 649€

Return flights