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

Return flights

06 May - 20 May	SWISS
06 May - 13 May	SWISS
27 May - 02 Jun	SWISS
06 May - 12 May	SWISS
27 May - 03 Jun	SWISS
20 May - 27 May	SWISS
21 May - 26 May	ITA Airways
19 May - 28 May	SWISS
06 May - 11 May	SWISS
12 May - 16 May	SWISS
14 May - 18 May	ITA Airways
27 May - 01 Jun	SWISS
22 May - 25 May	Luxair
29 May - 01 Jun	SWISS
26 May - 01 Jun	SWISS
28 May - 02 Jun	SWISS
28 May - 04 Jun	SWISS

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 $258

Return flights