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

Return flights

02 Mar - 06 Mar	SWISS
01 Mar - 05 Mar	KLM
11 Mar - 17 Mar	SWISS
05 Mar - 09 Mar	Luxair
06 Mar - 08 Mar	Luxair
12 Mar - 18 Mar	SWISS
23 Mar - 31 Mar	Lufthansa
10 Mar - 16 Mar	Luxair
20 Mar - 23 Mar	Luxair
06 Mar - 09 Mar	Luxair
31 Mar - 12 Apr	KLM
28 Mar - 04 Apr	KLM

Also check the deals for one-way flights from London to Porto in March.

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 March from $251

Return flights