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

Sunday, August 30th, 2026

7 round-trip options

Returning
Sat, Sep 5, 2026•6 Day Trip
$704 USD
Google Flights
Returning
Sun, Sep 6, 2026•7 Day Trip
$704 USD
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Returning
Mon, Sep 7, 2026•8 Day Trip
$704 USD
Google Flights
Returning
Tue, Sep 8, 2026•9 Day Trip
$704 USD
Google Flights
Returning
Thu, Sep 10, 2026•11 Day Trip
$708 USD
Google Flights
Returning
Fri, Sep 11, 2026•12 Day Trip
$708 USD
Google Flights
Returning
Sat, Sep 12, 2026•13 Day Trip
$708 USD
Google Flights