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

Return flights

02 Mar - 05 Mar	KLM
16 Mar - 19 Mar	KLM
05 Mar - 09 Mar	Luxair
04 Mar - 10 Mar	KLM
07 Mar - 11 Mar	KLM
07 Mar - 08 Mar	KLM
24 Mar - 29 Mar	SWISS
13 Mar - 16 Mar	Luxair
03 Mar - 12 Mar	SWISS
03 Mar - 08 Mar	KLM
30 Mar - 03 Apr	KLM
30 Mar - 04 Apr	KLM
26 Mar - 01 Apr	Luxair
03 Mar - 11 Apr	KLM
30 Mar - 12 Apr	KLM
28 Mar - 08 Apr	KLM
25 Mar - 11 Apr	KLM
30 Mar - 06 Apr	KLM
30 Mar - 10 Apr	SWISS
31 Mar - 06 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 $223

Return flights