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

Return flights

01 Dec - 08 Dec	easyJet
30 Dec - 10 Jan	easyJet
13 Dec - 20 Jan	Ryanair
14 Dec - 17 Jan	easyJet
16 Dec - 30 Dec	easyJet
09 Dec - 13 Jan	easyJet
23 Dec - 10 Jan	easyJet
29 Dec - 17 Jan	Ryanair
30 Dec - 17 Jan	easyJet
13 Dec - 20 Dec	Ryanair
01 Dec - 13 Dec	easyJet
03 Dec - 17 Dec	easyJet
15 Dec - 29 Dec	Ryanair
04 Dec - 20 Dec	easyJet
28 Dec - 17 Jan	easyJet
15 Dec - 23 Dec	Ryanair
27 Dec - 13 Jan	easyJet
13 Dec - 29 Dec	Ryanair
27 Dec - 06 Jan	easyJet
01 Dec - 14 Dec	easyJet

Also check the deals for one-way flights from London to San Jose in December.

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 December from 864€

Return flights