AirHint found the following cheapest return flights from London (LHR) to San Jose (SJO) in May 2026 (see full year).

Return flights

07 May - 11 May	Finnair
01 May - 15 May	Finnair
18 May - 31 May	Avianca
14 May - 24 May	Avianca
07 May - 19 May	Avianca
11 May - 31 May	Avianca
12 May - 20 May	Avianca
04 May - 18 May	Avianca
16 May - 30 May	Avianca
15 May - 29 May	Avianca
21 May - 02 Jun	Avianca
18 May - 03 Jun	Avianca
21 May - 03 Jun	Avianca
27 May - 03 Jun	Avianca
25 May - 06 Jun	KLM
23 May - 06 Jun	KLM

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

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 May from 590€

Return flights