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Cheap flights from Porto to Washington, D.C. from $340

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Porto to Washington, D.C. departing on 12/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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Multiple Airlines Logo
12:40 pm - 2:40 pmOPO-IAD
31h 00m1 stop
Multiple Airlines Logo
5:40 pm - 12:50 pmIAD-OPO
14h 10m1 stop
$551Multiple Airlines
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Thu, Dec 25 - Thu, Jan 1
United Airlines Logo
6:00 am - 9:15 pmOPO-IAD
19h 15m1 stop
United Airlines Logo
5:20 pm - 9:45 amIAD-OPO
11h 25m1 stop
$557United Airlines
Find Deal
Thu, Mar 26 - Thu, Apr 2
Multiple Airlines Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
Multiple Airlines Logo
8:45 pm - 6:30 pmIAD-OPO
16h 45m1 stop
$558Multiple Airlines
Find Deal
Sun, Mar 29 - Sun, Apr 5
Lufthansa Logo
6:00 am - 8:15 pmOPO-IAD
19h 15m1 stop
Lufthansa Logo
6:00 pm - 2:45 pmIAD-OPO
15h 45m1 stop
$561Lufthansa
Find Deal
Thu, Nov 20 - Thu, Dec 4
Air Canada Logo
6:00 am - 8:26 pmOPO-IAD
19h 26m2 stops
Air Canada Logo
1:20 pm - 11:10 amIAD-OPO
16h 50m2 stops
$563Air Canada
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Thu, Nov 20 - Thu, Dec 4
SWISS Logo
8:40 am - 5:40 pmOPO-IAD
13h 00m1 stop
SWISS Logo
8:45 pm - 6:30 pmIAD-OPO
16h 45m1 stop
$567SWISS
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Sat, Mar 28 - Sat, Apr 4
Delta Logo
6:00 am - 4:05 pmOPO-IAD
15h 05m1 stop
Delta Logo
12:19 pm - 10:30 amIAD-OPO
17h 11m2 stops
$568Delta
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Wed, Nov 19 - Sat, Dec 6
Delta Logo
6:00 am - 7:08 pmOPO-IAD
18h 08m2 stops
Delta Logo
12:19 pm - 10:30 amIAD-OPO
17h 11m2 stops
$573Delta
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Wed, Nov 19 - Sat, Dec 6
SWISS Logo
7:20 pm - 2:20 pmOPO-IAD
24h 00m2 stops
SWISS Logo
8:45 pm - 7:55 amIAD-OPO
30h 10m1 stop
$594SWISS
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Mon, Mar 30 - Mon, Apr 6
Lufthansa Logo
6:00 am - 9:25 pmOPO-IAD
20h 25m2 stops
Lufthansa Logo
10:40 pm - 11:25 pmIAD-OPO
19h 45m2 stops
$625Lufthansa
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Sat, Nov 22 - Sun, Apr 5

United Airlines flights from Porto to Washington, D.C. Dulles Intl Airport

Our best United Airlines deals on Porto to Washington, D.C. Dulles Intl Airport flight tickets
United Airlines
Mar 26
OPO6:00 amPorto
19h 15m
1 stop
IAD9:15 pmWashington, D.C. Dulles Intl
Apr 2
IAD5:20 pmWashington, D.C. Dulles Intl
11h 25m
1 stop
OPO9:45 amPorto
$557
Find similar
United Airlines
Mar 30
OPO6:00 amPorto
14h 05m
1 stop
IAD3:05 pmWashington, D.C. Dulles Intl
Apr 7
IAD5:20 pmWashington, D.C. Dulles Intl
11h 25m
1 stop
OPO9:45 amPorto
$580
Find similar
United Airlines
Mar 28
OPO6:00 amPorto
14h 50m
1 stop
IAD4:50 pmWashington, D.C. Dulles Intl
Apr 2
IAD5:20 pmWashington, D.C. Dulles Intl
11h 25m
1 stop
OPO9:45 amPorto
$581
Find similar

Lufthansa flights from Porto to Washington, D.C. Dulles Intl Airport

Our best Lufthansa deals on Porto to Washington, D.C. Dulles Intl Airport flight tickets
Lufthansa
Nov 20
OPO6:00 amPorto
19h 15m
1 stop
IAD8:15 pmWashington, D.C. Dulles Intl
Dec 4
IAD6:00 pmWashington, D.C. Dulles Intl
15h 45m
1 stop
OPO2:45 pmPorto
$561
Find similar
Lufthansa
Nov 22
OPO6:00 amPorto
20h 25m
2 stops
IAD9:25 pmWashington, D.C. Dulles Intl
Apr 5
IAD10:40 pmWashington, D.C. Dulles Intl
19h 45m
2 stops
OPO11:25 pmPorto
$625
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Porto to Washington, D.C. Dulles Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 3, 2025.
Use the filters below to find and compare flights from Porto to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 12/25

12:40 pm-2:40 pm

1 stop31h 00m

Washington, D.C. Dulles Intl

Thu 1/1

5:40 pm-12:50 pm

1 stop14h 10m

$551

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 3/26

6:00 am-9:15 pm

1 stop19h 15m

Washington, D.C. Dulles Intl

Thu 4/2

5:20 pm-9:45 am

1 stop11h 25m

$557

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 3/29

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Sun 4/5

8:45 pm-6:30 pm

1 stop16h 45m

$558

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 11/20

6:00 am-8:15 pm

1 stop19h 15m

Washington, D.C. Dulles Intl

Thu 12/4

6:00 pm-2:45 pm

1 stop15h 45m

$561

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 11/20

6:00 am-8:26 pm

2 stops19h 26m

Washington, D.C. Dulles Intl

Thu 12/4

1:20 pm-11:10 am

2 stops16h 50m

$563

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 3/28

8:40 am-5:40 pm

1 stop13h 00m

Washington, D.C. Dulles Intl

Sat 4/4

8:45 pm-6:30 pm

1 stop16h 45m

$567

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 11/19

6:00 am-4:05 pm

1 stop15h 05m

Washington, D.C. Dulles Intl

Sat 12/6

12:19 pm-10:30 am

2 stops17h 11m

$568

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 11/19

6:00 am-7:08 pm

2 stops18h 08m

Washington, D.C. Dulles Intl

Sat 12/6

12:19 pm-10:30 am

2 stops17h 11m

$573

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 3/30

7:20 pm-2:20 pm

2 stops24h 00m

Washington, D.C. Dulles Intl

Mon 4/6

8:45 pm-7:55 am

1 stop30h 10m

$594

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 11/22

6:00 am-9:25 pm

2 stops20h 25m

Washington, D.C. Dulles Intl

Sun 4/5

10:40 pm-11:25 pm

2 stops19h 45m

$625

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Porto to Washington, D.C. Dulles Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Monday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $581. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Porto to Washington, D.C. Dulles Intl Airport for around $942.

When to book flights from Porto to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Porto to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Porto to Washington, D.C. Dulles Intl Airport (OPO to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Porto to Washington, D.C. Dulles Intl Airport

Direct flights

None
There are no direct flights from Porto to Washington, D.C. Dulles Intl Airport. There are no popular flight routes from Porto to Washington, D.C. Dulles Intl Airport.
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  • How far is Porto to Washington, D.C. Dulles Intl by plane?

    There are 3541.8 mi between Porto and Washington, D.C. Dulles Intl. A reasonable flight in good conditions will take 11h 55m.

  • When did momondo last update prices for flights from Porto Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Porto Airport to Washington, D.C. Dulles Intl Airport are updated daily.

  • How many operators does momondo search for flights from Porto Airport to Washington, D.C. Dulles Intl Airport?

  • How old do you have to be to fly from Porto Airport to Washington, D.C. Dulles Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Porto Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Porto to Washington, D.C. Dulles Intl Airport?

Best airlines flying from Porto to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Porto to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
TAP AIR PORTUGALPriceFrom $480Free CancellationRating
7.1
2,044 reviews
Search TAP AIR PORTUGAL flights

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Winchester
Woodbridge
Waldorf
Tysons
Laurel
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Silver Spring
Fredericksburg
Harpers Ferry
Towson
Rockville
Manassas
Reston
Gaithersburg
Fairfax
Sterling

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