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

Return flights

18 May - 30 May	Iberia
22 May - 05 Jun	KLM
08 May - 12 Jun	KLM
01 May - 15 May	Air Canada
07 May - 31 May	SWISS
14 May - 21 May	SWISS
01 May - 09 May	Iberia
15 May - 29 May	SWISS
22 May - 29 May	SWISS
01 May - 18 May	Air Canada
15 May - 24 May	SWISS
01 May - 17 May	Air Canada
23 May - 01 Jun	Avianca
18 May - 01 Jun	Avianca
25 May - 01 Jun	Avianca
14 May - 02 Jun	Avianca
18 May - 11 Jun	KLM
26 May - 03 Jun	SWISS

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 608€

Return flights