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

Monday, July 13th, 2026

7 round-trip options

Returning
Sun, Jul 19, 2026•6 Day Trip
$811 USD
Google Flights
Returning
Mon, Jul 20, 2026•7 Day Trip
$811 USD
Google Flights
Returning
Tue, Jul 21, 2026•8 Day Trip
$811 USD
Google Flights
Returning
Wed, Jul 22, 2026•9 Day Trip
$811 USD
Google Flights
Returning
Fri, Jul 24, 2026•11 Day Trip
$811 USD
Google Flights
Returning
Sat, Jul 25, 2026•12 Day Trip
$811 USD
Google Flights
Returning
Sun, Jul 26, 2026•13 Day Trip
$811 USD
Google Flights