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

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United Airlines

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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

Monday, September 21st, 2026

4 round-trip options

Returning

Sun, Sep 27, 2026•6 Day Trip

$681 USD

Returning

Tue, Sep 29, 2026•8 Day Trip

$681 USD

Returning

Fri, Oct 2, 2026•11 Day Trip

$681 USD

Returning

Sun, Oct 4, 2026•13 Day Trip

$681 USD