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, October 1st, 2026

4 round-trip options

Returning
Wed, Oct 7, 2026•6 Day Trip
$684 USD
Google Flights
Returning
Fri, Oct 9, 2026•8 Day Trip
$685 USD
Google Flights
Returning
Mon, Oct 12, 2026•11 Day Trip
$681 USD
Google Flights
Returning
Wed, Oct 14, 2026•13 Day Trip
$681 USD
Google Flights