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

Saturday, July 18th, 2026

7 round-trip options

Returning
Fri, Jul 24, 2026•6 Day Trip
$813 USD
Google Flights
Returning
Sat, Jul 25, 2026•7 Day Trip
$812 USD
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Returning
Sun, Jul 26, 2026•8 Day Trip
$813 USD
Google Flights
Returning
Mon, Jul 27, 2026•9 Day Trip
$812 USD
Google Flights
Returning
Wed, Jul 29, 2026•11 Day Trip
$812 USD
Google Flights
Returning
Thu, Jul 30, 2026•12 Day Trip
$813 USD
Google Flights
Returning
Fri, Jul 31, 2026•13 Day Trip
$831 USD
Google Flights