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

Return flights

25 May - 29 May	Luxair
29 May - 04 Jun	Luxair
29 May - 05 Jun	Luxair
11 May - 16 May	Luxair
15 May - 18 May	Luxair
30 May - 05 Jun	Luxair
30 May - 02 Jun	Luxair
09 May - 13 May	KLM
09 May - 12 May	KLM
01 May - 05 May	Luxair
27 May - 29 May	Luxair
29 May - 01 Jun	Luxair
01 May - 07 May	Luxair
01 May - 08 May	Luxair
21 May - 25 May	ITA Airways
30 May - 01 Jun	Luxair
26 May - 02 Jun	Luxair
31 May - 07 Jun	KLM
31 May - 06 Jun	Luxair
21 May - 07 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 249€

Return flights