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

Return flights

22 May - 25 May	ITA Airways
05 May - 08 May	SWISS
11 May - 15 May	Luxair
28 May - 02 Jun	Luxair
29 May - 01 Jun	Luxair
01 May - 07 May	Luxair
26 May - 02 Jun	Luxair
15 May - 22 May	Luxair
04 May - 12 May	Luxair
08 May - 11 May	Luxair
18 May - 02 Jun	Luxair
04 May - 11 May	Luxair
05 May - 12 May	Luxair
07 May - 11 May	Luxair
25 May - 02 Jun	Luxair
25 May - 03 Jun	Luxair
21 May - 04 Jun	Luxair

Also check the deals for one-way flights from London to Porto 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 Porto in May from 223€

Return flights