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

Return flights

14 Mar - 16 Mar	Vueling Airlines
14 Mar - 24 Mar	Vueling Airlines
12 Mar - 16 Mar	Vueling Airlines
14 Mar - 26 Mar	Vueling Airlines
14 Mar - 20 Mar	Vueling Airlines
21 Mar - 24 Mar	Vueling Airlines
14 Mar - 21 Mar	Vueling Airlines
17 Mar - 24 Mar	Vueling Airlines
19 Mar - 24 Mar	Vueling Airlines
23 Mar - 24 Mar	Vueling Airlines
29 Mar - 05 Apr	TAP
31 Mar - 05 Apr	TAP
28 Mar - 11 Apr	Vueling Airlines
31 Mar - 07 Apr	KLM
29 Mar - 06 Apr	TAP
17 Mar - 02 Apr	British Airways

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 158€

Return flights