$429 Cheap United flights Washington (IAD) to Porto (OPO)

$429 Cheap United flights Washington (IAD) to Porto (OPO)

Prices were available within the past 7 days and start at $429 for one-way flights and $469 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Mar 4 - Thu, Mar 12

IAD

Washington

OPO

Porto

$469 Roundtrip, found 20 hours ago

$469

Roundtrip

found 20 hours ago

Select United flight, departing Wed, Mar 4 from Washington to Porto, returning Thu, Mar 12, priced at $469 found 20 hours ago

Tue, Mar 3 - Wed, Mar 11

IAD

Washington

OPO

Porto

$474 Roundtrip, found 5 days ago

$474

Roundtrip

found 5 days ago

Select United flight, departing Tue, Mar 3 from Washington to Porto, returning Wed, Mar 11, priced at $474 found 5 days ago

Sun, Mar 8 - Tue, Mar 17

IAD

Washington

OPO

Porto

$475 Roundtrip, found 20 hours ago

$475

Roundtrip

found 20 hours ago

Select United flight, departing Sun, Mar 8 from Washington to Porto, returning Tue, Mar 17, priced at $475 found 20 hours ago

Thu, Mar 5 - Thu, Mar 12

IAD

Washington

OPO

Porto

$495 Roundtrip, found 20 hours ago

$495

Roundtrip

found 20 hours ago

Select United flight, departing Thu, Mar 5 from Washington to Porto, returning Thu, Mar 12, priced at $495 found 20 hours ago

Tue, Mar 3 - Sat, Mar 14

IAD

Washington

OPO

Porto

$500 Roundtrip, found 20 hours ago

$500

Roundtrip

found 20 hours ago

Select United flight, departing Tue, Mar 3 from Washington to Porto, returning Sat, Mar 14, priced at $500 found 20 hours ago

Fri, Mar 6 - Thu, Mar 12

IAD

Washington

OPO

Porto

$501 Roundtrip, found 20 hours ago

$501

Roundtrip

found 20 hours ago

Select United flight, departing Fri, Mar 6 from Washington to Porto, returning Thu, Mar 12, priced at $501 found 20 hours ago

Sun, Mar 8 - Sun, Mar 15

IAD

Washington

OPO

Porto

$506 Roundtrip, found 20 hours ago

$506

Roundtrip

found 20 hours ago

Select United flight, departing Sun, Mar 8 from Washington to Porto, returning Sun, Mar 15, priced at $506 found 20 hours ago

Sun, Mar 8 - Sat, Mar 14

IAD

Washington

OPO

Porto

$509 Roundtrip, found 20 hours ago

$509

Roundtrip

found 20 hours ago

Select United flight, departing Sun, Mar 8 from Washington to Porto, returning Sat, Mar 14, priced at $509 found 20 hours ago