AirHint found the following cheapest return flights from Porto (OPO) to Boston (BOS) in July 2025 (see full year).

Return flights

28 Jul - 16 Aug	TAP	direct
13 Jul - 20 Jul	Air France
14 Jul - 21 Jul	Air France
16 Jul - 23 Jul	Air France
19 Jul - 23 Jul	Air France
19 Jul - 21 Jul	Air France
21 Jul - 28 Jul	Air France
20 Jul - 29 Jul	Air France
25 Jul - 05 Aug	Air France
16 Jul - 23 Jul	TAP	direct
18 Jul - 20 Jul	KLM
13 Jul - 19 Jul	Delta
26 Jul - 02 Aug	Delta
28 Jul - 03 Aug	Delta
31 Jul - 03 Aug	Delta
25 Jul - 01 Aug	Delta
30 Jul - 02 Aug	Ryanair

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

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 Porto to Boston in July from 589€

Return flights