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Cheap flights from Porto to Washington, D.C. from $358

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 3/24. 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

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
2:20 pm - 9:00 pm
OPO
-
IAD
11h 40m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pm
IAD
-
OPO
13h 30m1 stop
$506TAP AIR PORTUGAL
Fri, Jan 30 - Fri, Feb 6
TAP AIR PORTUGAL Logo
7:00 am - 3:15 pm
OPO
-
IAD
13h 15m1 stop
TAP AIR PORTUGAL Logo
5:30 pm - 9:55 am
IAD
-
OPO
11h 25m1 stop
$508TAP AIR PORTUGAL
Thu, Jan 29 - Thu, Feb 5
TAP AIR PORTUGAL Logo
8:55 am - 10:00 pm
OPO
-
IAD
17h 05m1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 7:00 pm
IAD
-
OPO
15h 25m1 stop
$520TAP AIR PORTUGAL
Sun, Mar 15 - Mon, Apr 13
Scandinavian Airlines Logo
10:25 am - 6:15 pm
OPO
-
IAD
35h 50m1 stop
Scandinavian Airlines Logo
8:20 pm - 11:00 am
IAD
-
OPO
33h 40m1 stop
$583Scandinavian Airlines
Wed, Mar 18 - Mon, Apr 13
United Airlines Logo
6:00 am - 4:50 pm
OPO
-
IAD
14h 50m1 stop
United Airlines Logo
5:37 pm - 9:45 am
IAD
-
OPO
11h 08m1 stop
$591United Airlines
Thu, Mar 12 - Sun, Apr 12
United Airlines Logo
6:00 am - 3:50 pm
OPO
-
IAD
14h 50m1 stop
United Airlines Logo
8:20 am - 11:40 am
IAD
-
OPO
22h 20m2 stops
$596United Airlines
Sat, Jan 31 - Sat, Feb 7
United Airlines Logo
6:00 am - 8:37 pm
OPO
-
IAD
18h 37m2 stops
United Airlines Logo
5:37 pm - 9:45 am
IAD
-
OPO
11h 08m1 stop
$597United Airlines
Thu, Mar 12 - Sun, Apr 12
SWISS Logo
11:55 am - 5:40 pm
OPO
-
IAD
33h 45m1 stop
SWISS Logo
8:20 pm - 11:25 am
IAD
-
OPO
34h 05m1 stop
$599SWISS
Sat, Mar 14 - Tue, Apr 14
Delta Logo
5:00 am - 4:05 pm
OPO
-
IAD
16h 05m1 stop
Delta Logo
12:23 pm - 10:25 am
IAD
-
OPO
17h 02m2 stops
$600Delta
Thu, Jan 29 - Thu, Feb 5
Multiple Airlines Logo
11:15 am - 5:05 pm
OPO
-
IAD
33h 50m1 stop
Multiple Airlines Logo
9:45 pm - 3:25 pm
IAD
-
OPO
12h 40m1 stop
$601Multiple Airlines
Sun, Mar 15 - Tue, Apr 14

TAP AIR PORTUGAL flights from Porto to Washington, D.C. Dulles Intl Airport

Our best TAP AIR PORTUGAL deals on Porto to Washington, D.C. Dulles Intl Airport flight tickets
TAP AIR PORTUGAL
Jan 30
OPO2:20 pmPorto
11h 40m
1 stop
IAD9:00 pmWashington, D.C. Dulles Intl
Feb 6
IAD10:30 pmWashington, D.C. Dulles Intl
13h 30m
1 stop
OPO5:00 pmPorto
$506
Find similar
TAP AIR PORTUGAL
Jan 29
OPO7:00 amPorto
13h 15m
1 stop
IAD3:15 pmWashington, D.C. Dulles Intl
Feb 5
IAD5:30 pmWashington, D.C. Dulles Intl
11h 25m
1 stop
OPO9:55 amPorto
$508
Find similar
TAP AIR PORTUGAL
Jan 15
OPO6:00 pmPorto
32h 00m
1 stop
IAD9:00 pmWashington, D.C. Dulles Intl
Jan 28
IAD10:30 pmWashington, D.C. Dulles Intl
14h 30m
1 stop
OPO6:00 pmPorto
$517
Find similar

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

Our best Scandinavian Airlines deals on Porto to Washington, D.C. Dulles Intl Airport flight tickets
Scandinavian Airlines
Mar 18
OPO10:25 amPorto
35h 50m
1 stop
IAD6:15 pmWashington, D.C. Dulles Intl
Apr 13
IAD8:20 pmWashington, D.C. Dulles Intl
33h 40m
1 stop
OPO11:00 amPorto
$583
Find similar
Scandinavian Airlines
Mar 18
OPO10:25 amPorto
35h 50m
1 stop
IAD6:15 pmWashington, D.C. Dulles Intl
Apr 11
IAD8:20 pmWashington, D.C. Dulles Intl
15h 45m
1 stop
OPO5:05 pmPorto
$683
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 December 18, 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

Fri 1/30

2:20 pm-9:00 pm

1 stop11h 40m

Washington, D.C. Dulles Intl

Fri 2/6

10:30 pm-5:00 pm

1 stop13h 30m

$506

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 1/29

7:00 am-3:15 pm

1 stop13h 15m

Washington, D.C. Dulles Intl

Thu 2/5

5:30 pm-9:55 am

1 stop11h 25m

$508

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 3/15

8:55 am-10:00 pm

1 stop17h 05m

Washington, D.C. Dulles Intl

Mon 4/13

10:35 pm-7:00 pm

1 stop15h 25m

$520

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 3/18

10:25 am-6:15 pm

1 stop35h 50m

Washington, D.C. Dulles Intl

Mon 4/13

8:20 pm-11:00 am

1 stop33h 40m

$583

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 3/12

6:00 am-4:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Sun 4/12

5:37 pm-9:45 am

1 stop11h 08m

$591

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 1/31

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Sat 2/7

8:20 am-11:40 am

2 stops22h 20m

$596

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 3/12

6:00 am-8:37 pm

2 stops18h 37m

Washington, D.C. Dulles Intl

Sun 4/12

5:37 pm-9:45 am

1 stop11h 08m

$597

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 3/14

11:55 am-5:40 pm

1 stop33h 45m

Washington, D.C. Dulles Intl

Tue 4/14

8:20 pm-11:25 am

1 stop34h 05m

$599

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 1/29

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

Thu 2/5

12:23 pm-10:25 am

2 stops17h 02m

$600

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 3/15

11:15 am-5:05 pm

1 stop33h 50m

Washington, D.C. Dulles Intl

Tue 4/14

9:45 pm-3:25 pm

1 stop12h 40m

$601

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

Fastest flight time

11h 40m

Direct flights

None
The fastest flight from Porto to Washington, D.C. Dulles Intl Airport takes 11h 40m
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 40m.

  • 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 $492Free CancellationRating
7.2
2,091 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
Colonial Beach
Silver Spring
Fredericksburg
Towson
Harpers Ferry
Rockville
Gaithersburg
Reston
Manassas
Sterling
Fairfax

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Can I find flights from Porto to Washington, D.C. with flexible booking policies on momondo?

All flight searches from Porto to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

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Of course. momondo tracks the price of Porto to Washington, D.C. flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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