Cheapest return flights from Washington to Porto in August from $688

Best time to book flights for Washington (DCA) to Porto (OPO) flights at AirHint

AirHint found the following cheapest return flights from Washington (DCA) to Porto (OPO) in August 2025 (see full year).

Return flights

19 Aug - 26 Aug United
05 Aug - 12 Aug United
06 Aug - 13 Aug United
13 Aug - 20 Aug KLM
20 Aug - 27 Aug KLM
26 Aug - 02 Sep KLM
27 Aug - 03 Sep KLM
12 Aug - 19 Aug Delta
14 Aug - 21 Aug United
18 Aug - 25 Aug United
31 Aug - 07 Sep United
04 Aug - 11 Aug United
15 Aug - 22 Aug Delta
25 Aug - 01 Sep Delta
29 Aug - 05 Sep Delta
30 Aug - 06 Sep United
28 Aug - 04 Sep United

Also check the deals for one-way flights from Washington to Porto in August.

Skyscanner

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.

Book a cheap hotel in Porto

Cheap car rent in Porto