AirHint found the following cheapest return flights from London (LCY) to Lisbon (LIS) in May 2026 (see full year).

Return flights

26 May - 28 May	SWISS
26 May - 02 Jun	SWISS
12 May - 22 May	SWISS
07 May - 12 May	ITA Airways
19 May - 27 May	SWISS
26 May - 29 May	SWISS
19 May - 22 May	SWISS
12 May - 14 May	SWISS
12 May - 16 May	SWISS
05 May - 13 May	SWISS
19 May - 26 May	SWISS
18 May - 10 Jun	SWISS
28 May - 05 Jun	KLM
25 May - 01 Jun	SWISS
30 May - 01 Jun	KLM
27 May - 07 Jun	SWISS
30 May - 07 Jun	KLM

Also check the deals for one-way flights from London to Lisbon 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 Lisbon in May from $283

Return flights