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

Return flights

19 May - 28 May	SWISS
19 May - 21 May	SWISS
12 May - 15 May	SWISS
11 May - 20 May	SWISS
12 May - 20 May	SWISS
19 May - 22 May	SWISS
09 May - 11 May	Luxair
06 May - 21 May	KLM
25 May - 28 May	SWISS
05 May - 20 May	ITA Airways
26 May - 01 Jun	Luxair
28 May - 01 Jun	Luxair
28 May - 04 Jun	KLM
30 May - 13 Jun	KLM
27 May - 03 Jun	SWISS
29 May - 01 Jun	Luxair
29 May - 02 Jun	SWISS
28 May - 08 Jun	KLM
28 May - 05 Jun	KLM
30 May - 05 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 $257

Return flights