Porto (OPO) to Washington (IAD) flight deal in economy from $676

Air CanadaACAir CanadaLufthansaLHLufthansaSwiss International Air LinesLXSwiss International Air LinesAustrian AirlinesOSAustrian AirlinesUnited AirlinesUAUnited Airlines
Round Trip•Economy
PortugalOPO

Francisco Sá Carneiro Airport

Porto, Portugal
United StatesIAD

Washington Dulles International Airport

Washington, United States
$739 USD
-9%$676 USD
Verified 13 days ago
Great Availability
66% of dates checked are available within 10% of the lowest price

Thursday, August 13th, 2026

7 round-trip options

Returning
Wed, Aug 19, 2026•6 Day Trip
$784 USD
Google Flights
Returning
Thu, Aug 20, 2026•7 Day Trip
$784 USD
Google Flights
Returning
Fri, Aug 21, 2026•8 Day Trip
$784 USD
Google Flights
Returning
Sat, Aug 22, 2026•9 Day Trip
$784 USD
Google Flights
Returning
Mon, Aug 24, 2026•11 Day Trip
$784 USD
Google Flights
Returning
Tue, Aug 25, 2026•12 Day Trip
$733 USD
Google Flights
Returning
Wed, Aug 26, 2026•13 Day Trip
$733 USD
Google Flights