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

Return flights

27 Sep - 04 Oct	Ryanair
26 Sep - 05 Oct	Ryanair
16 Sep - 07 Oct	Ryanair
21 Sep - 25 Sep	easyJet
04 Sep - 22 Sep	Ryanair
14 Sep - 29 Sep	easyJet
22 Sep - 25 Sep	easyJet
05 Sep - 25 Sep	easyJet
01 Sep - 15 Sep	Ryanair
11 Sep - 22 Sep	easyJet
07 Sep - 12 Sep	easyJet
12 Sep - 27 Sep	easyJet
26 Sep - 03 Oct	easyJet
05 Sep - 12 Sep	easyJet
27 Sep - 11 Oct	easyJet
29 Sep - 09 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 $939

Return flights