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

Return flights

23 Jul - 30 Jul	Air Canada
15 Jul - 22 Jul	Air Canada
22 Jul - 29 Jul	Air Canada
16 Jul - 23 Jul	Air Canada
21 Jul - 28 Jul	KLM
28 Jul - 04 Aug	Delta
20 Jul - 27 Jul	Delta
17 Jul - 24 Jul	United
18 Jul - 25 Jul	United
29 Jul - 05 Aug	Iberia
01 Jul - 07 Jul	United
27 Jul - 03 Aug	jetBlue
06 Jul - 22 Jul	Delta
26 Jul - 02 Aug	United
25 Jul - 01 Aug	Air Canada

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 604€

Return flights