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

Return flights

21 Mar - 24 Mar	Vueling Airlines
14 Mar - 24 Mar	Vueling Airlines
14 Mar - 18 Mar	Vueling Airlines
03 Mar - 18 Mar	Vueling Airlines
03 Mar - 10 Mar	Vueling Airlines
02 Mar - 18 Mar	Vueling Airlines
02 Mar - 10 Mar	Vueling Airlines
06 Mar - 08 Mar	TAP
09 Mar - 24 Mar	Vueling Airlines
09 Mar - 18 Mar	Vueling Airlines
31 Mar - 05 Apr	TAP
29 Mar - 01 Apr	TAP
30 Mar - 04 Apr	TAP
30 Mar - 02 Apr	TAP
28 Mar - 01 Apr	TAP
28 Mar - 02 Apr	SWISS
29 Mar - 03 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 $160

Return flights