OPO to IAD from $676 in economy – flightdeals.net

Home Premium Fare Deals About

Air Canada

Lufthansa

Swiss International Air Lines

LXSwiss International Air Lines

Austrian Airlines

OSAustrian Airlines

United Airlines

UAUnited Airlines

Round Trip•Economy

Francisco Sá Carneiro Airport

Porto, Portugal

Washington Dulles International Airport

Washington, United States

$739 USD

-9%$676 USD

Verified 13 days ago

September 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$701 1$681 2$681 3$681 4$681 5$681 6$694 7$694 8$681 9$681 10$681 11$681 12$690 13$690 14$681 15$681 16$681 17$681 18$681 19$681 20$681 21$681 22$681 23$681 24$681 25$681 26$690 27$681 28$694 29$681 30$681 1$681 2$681 3$690 4$681

Great Availability

66% of dates checked are available within 10% of the lowest price

Wednesday, September 16th, 2026

4 round-trip options

Returning

Tue, Sep 22, 2026•6 Day Trip

$681 USD

Returning

Thu, Sep 24, 2026•8 Day Trip

$681 USD

Returning

Sun, Sep 27, 2026•11 Day Trip

$681 USD

Returning

Tue, Sep 29, 2026•13 Day Trip

$681 USD