Porto (OPO) to Washington (IAD) flight deal in economy from $641

Iberia AirlinesIBIberia Airlines
Round Trip•Economy
PortugalOPO

Francisco Sá Carneiro Airport

Porto, Portugal
United StatesIAD

Washington Dulles International Airport

Washington, United States
$817 USD
-22%$641 USD
Verified 13 days ago
Good Availability
51% of dates checked are available within 10% of the lowest price

Tuesday, September 8th, 2026

7 round-trip options

Returning
Sun, Sep 13, 2026•5 Day Trip
$641 USD
Google Flights
Returning
Mon, Sep 14, 2026•6 Day Trip
$641 USD
Google Flights
Returning
Tue, Sep 15, 2026•7 Day Trip
$641 USD
Google Flights
Returning
Wed, Sep 16, 2026•8 Day Trip
$641 USD
Google Flights
Returning
Fri, Sep 18, 2026•10 Day Trip
$755 USD
Google Flights
Returning
Sat, Sep 19, 2026•11 Day Trip
$641 USD
Google Flights
Returning
Sun, Sep 20, 2026•12 Day Trip
$959 USD
Google Flights