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

Return flights

18 Sep - 21 Sep	Fly Play
20 Sep - 22 Sep	Fly Play
05 Sep - 07 Sep	Fly Play
15 Sep - 28 Sep	Ryanair
24 Sep - 27 Sep	Fly Play
07 Sep - 20 Sep	Fly Play
08 Sep - 09 Sep	Fly Play
15 Sep - 26 Sep	Ryanair
09 Sep - 19 Sep	Ryanair
15 Sep - 15 Oct	Ryanair
10 Sep - 28 Sep	Ryanair
26 Sep - 11 Oct	Fly Play
26 Sep - 03 Oct	Ryanair
22 Sep - 03 Oct	Ryanair
28 Sep - 05 Oct	Fly Play
12 Sep - 08 Oct	Ryanair
01 Sep - 01 Oct	Jet2
21 Sep - 11 Oct	Ryanair
21 Sep - 01 Oct	Ryanair
10 Sep - 08 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 595€

Return flights