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

Return flights

12 Mar - 15 Mar	Luxair
14 Mar - 15 Mar	Luxair
10 Mar - 17 Mar	Luxair
07 Mar - 07 Mar	Luxair
19 Mar - 22 Mar	Luxair
05 Mar - 08 Mar	Luxair
07 Mar - 11 Mar	KLM
18 Mar - 24 Mar	Luxair
02 Mar - 11 Mar	KLM
02 Mar - 07 Mar	KLM
24 Mar - 07 Apr	Iberia
30 Mar - 07 Apr	KLM
30 Mar - 03 Apr	KLM
30 Mar - 05 Apr	KLM
30 Mar - 04 Apr	KLM
22 Mar - 16 Apr	Iberia
31 Mar - 07 Apr	Iberia
26 Mar - 01 Apr	Iberia
08 Mar - 22 Apr	Iberia
30 Mar - 10 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 168€

Return flights