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

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

Prices were available within the past 7 days and start at for one-way flights and $482 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Apr 20 - Tue, Apr 28

IAD

Washington

OPO

Porto

$482 Roundtrip, found 18 hours ago

$482

Roundtrip

found 18 hours ago

Select United flight, departing Mon, Apr 20 from Washington to Porto, returning Tue, Apr 28, priced at $482 found 18 hours ago

Mon, Apr 20 - Fri, May 1

IAD

Washington

OPO

Porto

$501 Roundtrip, found 18 hours ago

$501

Roundtrip

found 18 hours ago

Select United flight, departing Mon, Apr 20 from Washington to Porto, returning Fri, May 1, priced at $501 found 18 hours ago

Sun, Apr 26 - Wed, Apr 29

IAD

Washington

OPO

Porto

$512 Roundtrip, found 18 hours ago

$512

Roundtrip

found 18 hours ago

Select United flight, departing Sun, Apr 26 from Washington to Porto, returning Wed, Apr 29, priced at $512 found 18 hours ago

Sun, Apr 26 - Fri, May 1

IAD

Washington

OPO

Porto

$531 Roundtrip, found 18 hours ago

$531

Roundtrip

found 18 hours ago

Select United flight, departing Sun, Apr 26 from Washington to Porto, returning Fri, May 1, priced at $531 found 18 hours ago

Fri, Apr 24 - Tue, Apr 28

IAD

Washington

OPO

Porto

$543 Roundtrip, found 18 hours ago

$543

Roundtrip

found 18 hours ago

Select United flight, departing Fri, Apr 24 from Washington to Porto, returning Tue, Apr 28, priced at $543 found 18 hours ago

Mon, Apr 20 - Sat, May 2

IAD

Washington

OPO

Porto

$551 Roundtrip, found 18 hours ago

$551

Roundtrip

found 18 hours ago

Select United flight, departing Mon, Apr 20 from Washington to Porto, returning Sat, May 2, priced at $551 found 18 hours ago

Fri, Apr 24 - Fri, May 1

IAD

Washington

OPO

Porto

$556 Roundtrip, found 18 hours ago

$556

Roundtrip

found 18 hours ago

Select United flight, departing Fri, Apr 24 from Washington to Porto, returning Fri, May 1, priced at $556 found 18 hours ago

Sat, Apr 25 - Tue, Apr 28

IAD

Washington

OPO

Porto

$562 Roundtrip, found 18 hours ago

$562

Roundtrip

found 18 hours ago

Select United flight, departing Sat, Apr 25 from Washington to Porto, returning Tue, Apr 28, priced at $562 found 18 hours ago

Thu, Apr 30 - Fri, May 1

IAD

Washington

OPO

Porto

$581 Roundtrip, found 17 hours ago

$581

Roundtrip

found 17 hours ago

Select United flight, departing Thu, Apr 30 from Washington to Porto, returning Fri, May 1, priced at $581 found 17 hours ago

Thu, Apr 30 - Sun, May 3

IAD

Washington

OPO

Porto

$601 Roundtrip, found 17 hours ago

$601

Roundtrip

found 17 hours ago

Select United flight, departing Thu, Apr 30 from Washington to Porto, returning Sun, May 3, priced at $601 found 17 hours ago

Fri, Apr 24 - Sat, May 2

IAD

Washington

OPO

Porto

$606 Roundtrip, found 18 hours ago

$606

Roundtrip

found 18 hours ago

Select United flight, departing Fri, Apr 24 from Washington to Porto, returning Sat, May 2, priced at $606 found 18 hours ago

Tue, May 5 - Tue, May 12

IAD

Washington

OPO

Porto

$623 Roundtrip, found 17 hours ago

$623

Roundtrip

found 17 hours ago

Select United flight, departing Tue, May 5 from Washington to Porto, returning Tue, May 12, priced at $623 found 17 hours ago