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Cheap flights from Porto to Washington, D.C. from $359

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 5/12. 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.
SWISS Logo
7:20 pm - 3:20 pm
OPO
-
IAD
25h 00m
1 stop
SWISS Logo
8:20 pm - 7:55 am
IAD
-
OPO
30h 35m
1 stop
$472SWISS
Fri, Mar 6 - Mon, May 25
TAP AIR PORTUGAL Logo
9:00 am - 3:05 pm
OPO
-
IAD
11h 05m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 11:10 pm
IAD
-
OPO
19h 35m
1 stop
$504TAP AIR PORTUGAL
Tue, Apr 21 - Wed, Apr 29
TAP AIR PORTUGAL Logo
10:30 pm - 8:35 pm
OPO
-
IAD
27h 05m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 7:00 pm
IAD
-
OPO
15h 25m
1 stop
$509TAP AIR PORTUGAL
Tue, Apr 21 - Wed, Apr 29
TAP AIR PORTUGAL Logo
9:00 am - 3:05 pm
OPO
-
IAD
11h 05m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 3:30 pm
IAD
-
OPO
11h 55m
1 stop
$514TAP AIR PORTUGAL
Thu, Apr 9 - Sat, Apr 18
Delta Logo
5:00 am - 4:05 pm
OPO
-
IAD
16h 05m
1 stop
Delta Logo
1:19 pm - 10:30 am
IAD
-
OPO
17h 11m
2 stops
$570Delta
Mon, Mar 2 - Mon, Mar 9
Delta Logo
5:00 am - 7:09 pm
OPO
-
IAD
19h 09m
2 stops
Delta Logo
1:19 pm - 10:30 am
IAD
-
OPO
17h 11m
2 stops
$575Delta
Mon, Mar 2 - Mon, Mar 9
Delta Logo
5:00 am - 3:35 pm
OPO
-
IAD
15h 35m
1 stop
Delta Logo
6:10 pm - 10:40 am
IAD
-
OPO
11h 30m
1 stop
$576Delta
Mon, May 4 - Mon, May 11
KLM Logo
4:20 pm - 3:35 pm
OPO
-
IAD
28h 15m
1 stop
KLM Logo
6:10 pm - 3:30 pm
IAD
-
OPO
16h 20m
1 stop
$582KLM
Tue, May 5 - Mon, May 11
Delta Logo
6:15 am - 11:03 pm
OPO
-
IAD
21h 48m
2 stops
Delta Logo
9:45 pm - 10:00 pm
IAD
-
OPO
19h 15m
1 stop
$583Delta
Tue, Apr 21 - Wed, Apr 29
KLM Logo
5:00 am - 3:35 pm
OPO
-
IAD
15h 35m
1 stop
KLM Logo
9:45 pm - 10:00 pm
IAD
-
OPO
19h 15m
1 stop
$586KLM
Thu, Apr 2 - Sat, Apr 11

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
Apr 21
OPO9:00 amPorto
11h 05m
1 stop
IAD3:05 pmWashington, D.C. Dulles Intl
Apr 29
IAD10:35 pmWashington, D.C. Dulles Intl
19h 35m
1 stop
OPO11:10 pmPorto
$504
TAP AIR PORTUGAL
Apr 21
OPO10:30 pmPorto
27h 05m
1 stop
IAD8:35 pmWashington, D.C. Dulles Intl
Apr 29
IAD10:35 pmWashington, D.C. Dulles Intl
15h 25m
1 stop
OPO7:00 pmPorto
$509
TAP AIR PORTUGAL
Apr 9
OPO9:00 amPorto
11h 05m
1 stop
IAD3:05 pmWashington, D.C. Dulles Intl
Apr 18
IAD10:35 pmWashington, D.C. Dulles Intl
11h 55m
1 stop
OPO3:30 pmPorto
$514

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

Our best SWISS deals on Porto to Washington, D.C. Dulles Intl Airport flight tickets
SWISS
Mar 6
OPO7:20 pmPorto
25h 00m
1 stop
IAD3:20 pmWashington, D.C. Dulles Intl
May 25
IAD8:20 pmWashington, D.C. Dulles Intl
30h 35m
1 stop
OPO7:55 amPorto
$472
SWISS
Mar 18
OPO7:20 pmPorto
24h 00m
1 stop
IAD3:20 pmWashington, D.C. Dulles Intl
Mar 25
IAD5:20 pmWashington, D.C. Dulles Intl
34h 35m
1 stop
OPO7:55 amPorto
$627

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 February 3, 2026.
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 3/6

7:20 pm-3:20 pm

1 stop25h 00m

Washington, D.C. Dulles Intl

Mon 5/25

8:20 pm-7:55 am

1 stop30h 35m

$472

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 4/21

9:00 am-3:05 pm

1 stop11h 05m

Washington, D.C. Dulles Intl

Wed 4/29

10:35 pm-11:10 pm

1 stop19h 35m

$504

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 4/21

10:30 pm-8:35 pm

1 stop27h 05m

Washington, D.C. Dulles Intl

Wed 4/29

10:35 pm-7:00 pm

1 stop15h 25m

$509

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/9

9:00 am-3:05 pm

1 stop11h 05m

Washington, D.C. Dulles Intl

Sat 4/18

10:35 pm-3:30 pm

1 stop11h 55m

$514

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 3/2

5:00 am-4:05 pm

1 stop16h 05m

Washington, D.C. Dulles Intl

Mon 3/9

1:19 pm-10:30 am

2 stops17h 11m

$570

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 3/2

5:00 am-7:09 pm

2 stops19h 09m

Washington, D.C. Dulles Intl

Mon 3/9

1:19 pm-10:30 am

2 stops17h 11m

$575

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 5/4

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Mon 5/11

6:10 pm-10:40 am

1 stop11h 30m

$576

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 5/5

4:20 pm-3:35 pm

1 stop28h 15m

Washington, D.C. Dulles Intl

Mon 5/11

6:10 pm-3:30 pm

1 stop16h 20m

$582

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 4/21

6:15 am-11:03 pm

2 stops21h 48m

Washington, D.C. Dulles Intl

Wed 4/29

9:45 pm-10:00 pm

1 stop19h 15m

$583

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 4/2

5:00 am-3:35 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Sat 4/11

9:45 pm-10:00 pm

1 stop19h 15m

$586

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest 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 typical price of a round-trip flight between Porto and Washington, D.C. Dulles Intl Airport?

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

13h 05m

Direct flights

None
The fastest flight from Porto to Washington, D.C. Dulles Intl Airport takes 13h 05m
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.
Search flight deals

  • 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 13h 05m.

  • 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
7.1
2,133 reviews
Search TAP AIR PORTUGAL flights

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

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Alexandria
National Harbor
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Silver Spring
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Rockville
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Springfield
Sterling
Fairfax
Linthicum Heights

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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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