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Cheap flights from Porto to Washington, D.C. from $395

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 5/26. 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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Find the cheapest flights from Porto to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
Lufthansa Logo
3:25 pm - 11:15 am
IAD
-
OPO
14h 50m
1 stop
$668Lufthansa
Thu, May 28 - Thu, Jun 4
SWISS Logo
12:15 pm - 3:30 pm
OPO
-
IAD
32h 15m
1 stop
SWISS Logo
8:20 pm - 11:25 am
IAD
-
OPO
34h 05m
1 stop
$671SWISS
Wed, May 20 - Tue, Jun 2
SWISS Logo
7:20 pm - 4:45 pm
OPO
-
IAD
26h 25m
1 stop
SWISS Logo
8:20 pm - 7:55 am
IAD
-
OPO
30h 35m
1 stop
$674SWISS
Thu, May 21 - Wed, May 27
SWISS Logo
7:20 pm - 3:15 pm
OPO
-
IAD
24h 55m
1 stop
SWISS Logo
8:20 pm - 6:30 pm
IAD
-
OPO
17h 10m
1 stop
$679SWISS
Thu, May 14 - Fri, May 29
Lufthansa Logo
6:00 am - 3:55 pm
OPO
-
IAD
14h 55m
1 stop
Lufthansa Logo
3:25 pm - 11:20 am
IAD
-
OPO
14h 55m
1 stop
$680Lufthansa
Wed, Jun 17 - Wed, Jun 24
Lufthansa Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
Lufthansa Logo
5:55 pm - 11:15 am
IAD
-
OPO
12h 20m
1 stop
$682Lufthansa
Sun, Sep 20 - Sat, Sep 26
Lufthansa Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
Lufthansa Logo
3:25 pm - 11:15 am
IAD
-
OPO
14h 50m
1 stop
$687Lufthansa
Thu, Sep 10 - Mon, Sep 14
SWISS Logo
12:15 pm - 4:45 pm
OPO
-
IAD
33h 30m
1 stop
SWISS Logo
8:20 pm - 7:55 am
IAD
-
OPO
30h 35m
1 stop
$694SWISS
Fri, Jun 12 - Sun, Jun 14
United Airlines Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
United Airlines Logo
12:35 pm - 6:55 am
IAD
-
OPO
13h 20m
1 stop
$695United Airlines
Sat, May 16 - Fri, May 29
United Airlines Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
United Airlines Logo
8:29 am - 6:15 am
IAD
-
OPO
16h 46m
1 stop
$696United Airlines
Thu, Sep 10 - Tue, Sep 15

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
May 20
OPO12:15 pmPorto
32h 15m
1 stop
IAD3:30 pmWashington, D.C. Dulles Intl
Jun 2
IAD8:20 pmWashington, D.C. Dulles Intl
34h 05m
1 stop
OPO11:25 amPorto
$671
SWISS
May 21
OPO7:20 pmPorto
26h 25m
1 stop
IAD4:45 pmWashington, D.C. Dulles Intl
May 27
IAD8:20 pmWashington, D.C. Dulles Intl
30h 35m
1 stop
OPO7:55 amPorto
$674
SWISS
May 14
OPO7:20 pmPorto
24h 55m
1 stop
IAD3:15 pmWashington, D.C. Dulles Intl
May 29
IAD8:20 pmWashington, D.C. Dulles Intl
17h 10m
1 stop
OPO6:30 pmPorto
$679

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
May 16
OPO6:00 amPorto
15h 05m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
May 29
IAD12:35 pmWashington, D.C. Dulles Intl
13h 20m
1 stop
OPO6:55 amPorto
$695
United Airlines
Sep 10
OPO6:00 amPorto
15h 05m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
Sep 15
IAD8:29 amWashington, D.C. Dulles Intl
16h 46m
1 stop
OPO6:15 amPorto
$696
United Airlines
May 21
OPO12:10 pmPorto
12h 50m
1 stop
IAD8:00 pmWashington, D.C. Dulles Intl
May 27
IAD12:35 pmWashington, D.C. Dulles Intl
22h 05m
2 stops
OPO3:40 pmPorto
$700

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 May 4, 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

Cheapest round-trip

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 5/28

6:00 am-4:05 pm

1 stop15h 05m

Washington, D.C. Dulles Intl

Thu 6/4

3:25 pm-11:15 am

1 stop14h 50m

$668

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 5/20

12:15 pm-3:30 pm

1 stop32h 15m

Washington, D.C. Dulles Intl

Tue 6/2

8:20 pm-11:25 am

1 stop34h 05m

$671

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 5/21

7:20 pm-4:45 pm

1 stop26h 25m

Washington, D.C. Dulles Intl

Wed 5/27

8:20 pm-7:55 am

1 stop30h 35m

$674

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 5/14

7:20 pm-3:15 pm

1 stop24h 55m

Washington, D.C. Dulles Intl

Fri 5/29

8:20 pm-6:30 pm

1 stop17h 10m

$679

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Wed 6/17

6:00 am-3:55 pm

1 stop14h 55m

Washington, D.C. Dulles Intl

Wed 6/24

3:25 pm-11:20 am

1 stop14h 55m

$680
Quickest round-trip

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 9/20

6:00 am-4:05 pm

1 stop15h 05m

Washington, D.C. Dulles Intl

Sat 9/26

5:55 pm-11:15 am

1 stop12h 20m

$682

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/10

6:00 am-4:05 pm

1 stop15h 05m

Washington, D.C. Dulles Intl

Mon 9/14

3:25 pm-11:15 am

1 stop14h 50m

$687

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 6/12

12:15 pm-4:45 pm

1 stop33h 30m

Washington, D.C. Dulles Intl

Sun 6/14

8:20 pm-7:55 am

1 stop30h 35m

$694

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sat 5/16

6:00 am-4:05 pm

1 stop15h 05m

Washington, D.C. Dulles Intl

Fri 5/29

12:35 pm-6:55 am

1 stop13h 20m

$695

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/10

6:00 am-4:05 pm

1 stop15h 05m

Washington, D.C. Dulles Intl

Tue 9/15

8:29 am-6:15 am

1 stop16h 46m

$696

Flights are sorted by cheapest round-trip flights first.

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

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

In general, September is the cheapest month to fly from Porto to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $466.

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

14h 55m

Direct flights

None
The fastest flight from Porto to Washington, D.C. Dulles Intl Airport takes 14h 55m
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

Frequently asked questions about flying from Porto to Washington, D.C. Dulles Intl Airport

  • 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 14h 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 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.

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
Waldorf
Woodbridge
Laurel
Colonial Beach
Gaithersburg
Towson
Fredericksburg
Silver Spring
Rockville
Manassas
Sterling
Linthicum Heights
Tysons
Bethesda
Springfield

Why use momondo?

Why should I use momondo to find a flight deal from Porto to Washington, D.C.?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Porto to Washington, D.C.. Millions of users trust and use momondo every year so you are in good hands.

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.

How can momondo help me find flights from Porto to Washington, D.C.?

Once all potential Porto to Washington, D.C. flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Porto to Washington, D.C. right now. Can momondo alert me if prices change?

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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