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

Return flights

27 May - 10 Jun	SWISS
06 May - 13 May	Avianca
14 May - 21 May	Avianca
24 May - 31 May	Avianca
04 May - 13 May	Avianca
12 May - 21 May	Avianca
18 May - 26 May	Avianca
26 May - 03 Jun	Avianca
01 May - 18 May	SWISS
13 May - 01 Jun	Avianca
04 May - 19 May	Avianca
05 May - 26 May	Avianca
03 May - 14 Jun	Air France
22 May - 06 Jun	Air France
18 May - 08 Jun	Avianca
14 May - 02 Jun	Avianca
01 May - 11 May	SWISS
25 May - 05 Jun	Avianca
25 May - 10 Jun	Air France
20 May - 03 Jun	Air France

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 $758

Return flights