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

Return flights

04 May - 11 May	TAP
06 May - 13 May	TAP
08 May - 15 May	TAP
08 May - 20 May	TAP
06 May - 18 May	TAP
03 May - 10 May	TAP
07 May - 14 May	TAP
09 May - 18 May	TAP
02 May - 09 May	TAP
05 May - 12 May	TAP
25 May - 03 Jun	TAP
27 May - 01 Jun	TAP
28 May - 03 Jun	TAP
29 May - 07 Jun	TAP
30 May - 08 Jun	Azores Airlines

Also check the deals for one-way flights from Boston to Porto in May.

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 May from 292€

Return flights