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

Return flights

12 May - 20 May	SWISS
26 May - 28 May	SWISS
30 May - 03 Jun	KLM
06 May - 08 May	SWISS
01 May - 05 May	KLM
25 May - 28 May	KLM
01 May - 06 May	KLM
26 May - 05 Jun	SWISS
04 May - 07 May	KLM
06 May - 09 May	SWISS
12 May - 19 May	SWISS
24 May - 27 May	KLM
30 May - 04 Jun	KLM
27 May - 03 Jun	SWISS
25 May - 01 Jun	KLM
25 May - 10 Jun	KLM
29 May - 01 Jun	Luxair
30 May - 05 Jun	KLM
28 May - 05 Jun	KLM
29 May - 02 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 233€

Return flights