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

Tuesday, August 18th, 2026

7 round-trip options

Returning
Mon, Aug 24, 2026•6 Day Trip
$813 USD
Google Flights
Returning
Tue, Aug 25, 2026•7 Day Trip
$761 USD
Google Flights
Returning
Wed, Aug 26, 2026•8 Day Trip
$761 USD
Google Flights
Returning
Thu, Aug 27, 2026•9 Day Trip
$761 USD
Google Flights
Returning
Sat, Aug 29, 2026•11 Day Trip
$761 USD
Google Flights
Returning
Sun, Aug 30, 2026•12 Day Trip
$761 USD
Google Flights
Returning
Mon, Aug 31, 2026•13 Day Trip
$761 USD
Google Flights