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

Return flights

20 May - 26 May	Iberia
05 May - 08 May	Iberia
20 May - 27 May	Iberia
08 May - 12 May	Iberia
09 May - 14 May	KLM
09 May - 13 May	KLM
02 May - 06 May	Luxair
05 May - 26 May	Iberia
25 May - 27 May	Iberia
07 May - 14 May	KLM
27 May - 01 Jun	Iberia
18 May - 21 Jun	Iberia
28 May - 02 Jun	Iberia
28 May - 08 Jun	Luxair
20 May - 14 Jun	Iberia
27 May - 14 Jun	Iberia
29 May - 01 Jun	Luxair
28 May - 01 Jun	Luxair
20 May - 08 Jun	KLM
29 May - 08 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 214€

Return flights