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

Return flights

16 Jul - 09 Aug	TAP	direct
24 Jul - 27 Jul	British Airways
17 Jul - 10 Aug	Iberia
17 Jul - 09 Aug	Iberia
16 Jul - 20 Jul	British Airways
30 Jul - 10 Aug	Iberia
19 Jul - 11 Aug	Iberia
28 Jul - 06 Aug	Iberia
19 Jul - 23 Jul	Air France
30 Jul - 10 Aug	TAP	direct
11 Jul - 16 Jul	KLM
24 Jul - 31 Jul	Delta

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 $738

Return flights