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

Return flights

10 Mar - 17 Mar	SWISS
30 Mar - 06 Apr	TAP
16 Mar - 23 Mar	Lufthansa
17 Mar - 25 Mar	SWISS
17 Mar - 24 Mar	SWISS
25 Mar - 01 Apr	Iberia
25 Mar - 30 Mar	Lufthansa
01 Mar - 08 Mar	United
25 Mar - 29 Mar	Lufthansa
12 Mar - 20 Mar	United
26 Mar - 29 Mar	Lufthansa
27 Mar - 04 Apr	Lufthansa
13 Mar - 18 Mar	Iberia

Also check the deals for one-way flights from Boston 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 Boston to Porto in March from 309€

Return flights