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

Return flights

18 Sep - 03 Oct	Wizz Air
25 Sep - 02 Oct	easyJet
10 Sep - 21 Sep	Ryanair
09 Sep - 30 Sep	Jet2
18 Sep - 01 Oct	easyJet
04 Sep - 09 Sep	Ryanair
28 Sep - 05 Oct	easyJet
04 Sep - 22 Sep	easyJet
09 Sep - 16 Sep	Jet2
15 Sep - 29 Sep	Ryanair
16 Sep - 29 Sep	Ryanair
14 Sep - 22 Sep	easyJet
12 Sep - 27 Sep	easyJet
20 Sep - 11 Oct	easyJet
07 Sep - 20 Sep	easyJet
25 Sep - 05 Oct	easyJet

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 681€

Return flights