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Cheap flights from Porto to Washington, D.C. from $356

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 11/19. 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

American Airlines Logo
8:15 am - 3:00 pmOPO-IAD
11h 45m1 stop
American Airlines Logo
4:35 pm - 7:35 amIAD-OPO
10h 00m1 stop
$530American Airlines
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Thu, Oct 2 - Wed, Oct 15
Iberia Logo
8:15 am - 3:00 pmOPO-IAD
11h 45m1 stop
Iberia Logo
4:35 pm - 7:35 amIAD-OPO
10h 00m1 stop
$531Iberia
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Thu, Oct 2 - Wed, Oct 15
SWISS Logo
7:20 pm - 4:15 pmOPO-IAD
25h 55m1 stop
SWISS Logo
8:45 pm - 6:30 pmIAD-OPO
16h 45m1 stop
$540SWISS
Find Deal
Thu, Oct 2 - Wed, Oct 15
Delta Logo
6:15 am - 3:35 pmOPO-IAD
14h 20m1 stop
Delta Logo
7:59 pm - 3:30 pmIAD-OPO
14h 31m2 stops
$544Delta
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Wed, Oct 8 - Tue, Oct 21
Delta Logo
6:15 am - 7:18 pmOPO-IAD
18h 03m2 stops
Delta Logo
7:59 pm - 3:30 pmIAD-OPO
14h 31m2 stops
$550Delta
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Wed, Oct 8 - Tue, Oct 21
KLM Logo
11:35 am - 3:35 pmOPO-IAD
33h 00m1 stop
KLM Logo
5:25 pm - 10:40 amIAD-OPO
12h 15m1 stop
$551KLM
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Wed, Oct 8 - Tue, Oct 21
KLM Logo
4:20 pm - 3:35 pmOPO-IAD
28h 15m1 stop
KLM Logo
5:25 pm - 7:15 pmIAD-OPO
20h 50m1 stop
$552KLM
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Wed, Oct 8 - Tue, Oct 21
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
Lufthansa Logo
10:55 pm - 11:40 pmIAD-OPO
19h 45m1 stop
$553Lufthansa
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Thu, Oct 9 - Fri, Dec 26
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
Lufthansa Logo
10:55 pm - 11:40 pmIAD-OPO
19h 45m1 stop
$559Lufthansa
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Thu, Oct 9 - Thu, Dec 11
SWISS Logo
7:00 pm - 2:55 pmOPO-IAD
23h 55m2 stops
SWISS Logo
5:25 pm - 11:10 amIAD-OPO
12h 45m1 stop
$614SWISS
Find Deal
Fri, Oct 31 - Fri, Nov 7

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
Oct 2
OPO7:20 pmPorto
25h 55m
1 stop
IAD4:15 pmWashington, D.C. Dulles Intl
Oct 15
IAD8:45 pmWashington, D.C. Dulles Intl
16h 45m
1 stop
OPO6:30 pmPorto
$540
Find similar
SWISS
Oct 31
OPO7:00 pmPorto
23h 55m
2 stops
IAD2:55 pmWashington, D.C. Dulles Intl
Nov 7
IAD5:25 pmWashington, D.C. Dulles Intl
12h 45m
1 stop
OPO11:10 amPorto
$614
Find similar
SWISS
Sep 26
OPO8:40 amPorto
12h 35m
1 stop
IAD4:15 pmWashington, D.C. Dulles Intl
Oct 5
IAD8:45 pmWashington, D.C. Dulles Intl
17h 35m
2 stops
OPO7:20 pmPorto
$678
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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
Oct 9
OPO6:00 amPorto
14h 50m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl
Dec 26
IAD10:55 pmWashington, D.C. Dulles Intl
19h 45m
1 stop
OPO11:40 pmPorto
$553
Find similar
Lufthansa
Oct 9
OPO6:00 amPorto
14h 50m
1 stop
IAD3:50 pmWashington, D.C. Dulles Intl
Dec 11
IAD10:55 pmWashington, D.C. Dulles Intl
19h 45m
1 stop
OPO11:40 pmPorto
$559
Find similar
Lufthansa
Dec 24
OPO6:00 amPorto
13h 35m
1 stop
IAD2:35 pmWashington, D.C. Dulles Intl
Jan 3
IAD10:55 pmWashington, D.C. Dulles Intl
19h 45m
1 stop
OPO11:40 pmPorto
$591
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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 September 17, 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 10/2

8:15 am-3:00 pm

1 stop11h 45m

Washington, D.C. Dulles Intl

Wed 10/15

4:35 pm-7:35 am

1 stop10h 00m

$530

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 10/2

8:15 am-3:00 pm

1 stop11h 45m

Washington, D.C. Dulles Intl

Wed 10/15

4:35 pm-7:35 am

1 stop10h 00m

$531

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 10/2

7:20 pm-4:15 pm

1 stop25h 55m

Washington, D.C. Dulles Intl

Wed 10/15

8:45 pm-6:30 pm

1 stop16h 45m

$540

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

6:15 am-3:35 pm

1 stop14h 20m

Washington, D.C. Dulles Intl

Tue 10/21

7:59 pm-3:30 pm

2 stops14h 31m

$544

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

6:15 am-7:18 pm

2 stops18h 03m

Washington, D.C. Dulles Intl

Tue 10/21

7:59 pm-3:30 pm

2 stops14h 31m

$550

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

11:35 am-3:35 pm

1 stop33h 00m

Washington, D.C. Dulles Intl

Tue 10/21

5:25 pm-10:40 am

1 stop12h 15m

$551

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 10/8

4:20 pm-3:35 pm

1 stop28h 15m

Washington, D.C. Dulles Intl

Tue 10/21

5:25 pm-7:15 pm

1 stop20h 50m

$552

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 10/9

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Fri 12/26

10:55 pm-11:40 pm

1 stop19h 45m

$553

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 10/9

6:00 am-3:50 pm

1 stop14h 50m

Washington, D.C. Dulles Intl

Thu 12/11

10:55 pm-11:40 pm

1 stop19h 45m

$559

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 10/31

7:00 pm-2:55 pm

2 stops23h 55m

Washington, D.C. Dulles Intl

Fri 11/7

5:25 pm-11:10 am

1 stop12h 45m

$614

Flights are sorted by cheapest round-trip flights first.

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See travel insights to Washington, D.C. from

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 45m.

  • 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
1,977 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
Gettysburg
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Arlington
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Fredericksburg
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Fairfax
Glen Burnie
Gaithersburg

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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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