AirHint found the following cheapest return flights from Washington (IAD) to Porto (OPO) in July 2026 (see full year).

Return flights

14 Jul - 22 Jul	Air Canada
06 Jul - 14 Jul	Brussels Airlines
14 Jul - 21 Jul	British Airways
13 Jul - 20 Jul	British Airways
12 Jul - 20 Jul	British Airways
13 Jul - 21 Jul	British Airways
04 Jul - 14 Jul	Lufthansa
04 Jul - 19 Jul	Royal Air Maroc
09 Jul - 17 Jul	Royal Air Maroc
11 Jul - 19 Jul	Royal Air Maroc

Also check the deals for one-way flights from Washington to Porto 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 Washington to Porto in July from $666

Return flights