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Cheap flights from Porto to Washington, D.C. from $402

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 6/8. 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.
SWISS Logo
12:15 pm - 3:30 pm
OPO
-
IAD
32h 15m
1 stop
SWISS Logo
8:20 pm - 6:30 pm
IAD
-
OPO
17h 10m
1 stop
$665SWISS
Fri, May 22 - Thu, Jun 4
SWISS Logo
8:40 am - 4:45 pm
OPO
-
IAD
13h 05m
1 stop
SWISS Logo
8:20 pm - 5:35 pm
IAD
-
OPO
16h 15m
1 stop
$673SWISS
Fri, Jun 12 - Tue, Jun 16
SWISS Logo
12:15 pm - 4:45 pm
OPO
-
IAD
33h 30m
1 stop
SWISS Logo
8:20 pm - 11:25 am
IAD
-
OPO
34h 05m
1 stop
$682SWISS
Tue, Jun 16 - Sun, Jun 21
Lufthansa Logo
6:00 am - 3:55 pm
OPO
-
IAD
14h 55m
1 stop
Lufthansa Logo
3:25 pm - 11:15 am
IAD
-
OPO
14h 50m
1 stop
$686Lufthansa
Tue, Jun 16 - Mon, Jun 22
SWISS Logo
7:20 pm - 2:20 pm
OPO
-
IAD
24h 00m
2 stops
SWISS Logo
8:20 pm - 6:30 pm
IAD
-
OPO
17h 10m
1 stop
$692SWISS
Fri, May 22 - Thu, Jun 4
United Airlines Logo
12:10 pm - 8:00 pm
OPO
-
IAD
12h 50m
1 stop
United Airlines Logo
8:29 am - 6:55 am
IAD
-
OPO
17h 26m
1 stop
$695United Airlines
Thu, May 21 - Wed, Jun 3
United Airlines Logo
6:00 am - 3:15 pm
OPO
-
IAD
14h 15m
1 stop
United Airlines Logo
8:15 am - 6:55 am
IAD
-
OPO
17h 40m
1 stop
$697United Airlines
Sun, May 24 - Sat, Jun 6
Delta Logo
5:00 am - 5:07 pm
OPO
-
DCA
17h 07m
2 stops
Delta Logo
11:00 am - 8:30 am
DCA
-
OPO
16h 30m
2 stops
$710Delta
Fri, May 22 - Thu, Jun 4
Delta Logo
5:00 am - 7:16 pm
OPO
-
BWI
19h 16m
2 stops
Delta Logo
1:59 pm - 10:30 am
BWI
-
OPO
15h 31m
2 stops
$714Delta
Thu, May 21 - Wed, Jun 3
KLM Logo
1:05 pm - 11:21 pm
OPO
-
DCA
15h 16m
1 stop
KLM Logo
11:00 am - 10:25 am
DCA
-
OPO
18h 25m
1 stop
$725KLM
Tue, Jun 16 - Sun, Jun 21

Air Canada flights from Porto to Washington, D.C.

Our best Air Canada deals on Porto to Washington, D.C. flight tickets
Air Canada
Jun 12
OPO6:00 amPorto
19h 29m
2 stops
IAD8:29 pmWashington, D.C. Dulles Intl
Jun 16
IAD10:10 pmWashington, D.C. Dulles Intl
27h 50m
2 stops
OPO7:00 amPorto
$731
Air Canada
Jun 12
OPO12:05 pmPorto
15h 23m
2 stops
DCA10:28 pmWashington, D.C. Reagan-National
Jun 16
DCA8:40 pmWashington, D.C. Reagan-National
29h 20m
2 stops
OPO7:00 amPorto
$739
Air Canada
May 25
OPO6:20 amPorto
19h 09m
2 stops
IAD8:29 pmWashington, D.C. Dulles Intl
Jun 7
IAD8:18 amWashington, D.C. Dulles Intl
17h 42m
2 stops
OPO7:00 amPorto
$746

Delta flights from Porto to Washington, D.C.

Our best Delta deals on Porto to Washington, D.C. flight tickets
Delta
May 23
OPO5:00 amPorto
15h 35m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
May 30
IAD6:15 pmWashington, D.C. Dulles Intl
16h 10m
1 stop
OPO3:25 pmPorto
$706
Delta
May 24
OPO5:00 amPorto
15h 35m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Jun 6
IAD7:33 pmWashington, D.C. Dulles Intl
14h 52m
2 stops
OPO3:25 pmPorto
$708
Delta
May 24
OPO5:00 amPorto
15h 35m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Jun 6
IAD7:33 pmWashington, D.C. Dulles Intl
14h 52m
2 stops
OPO3:25 pmPorto
$709

momondo Fare Finder

 
Customize your flight search to find flights from Porto to Washington, D.C. 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 9, 2026.
Use the filters below to find and compare flights from Porto to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 5/22

12:15 pm-3:30 pm

1 stop32h 15m

Washington, D.C. Dulles Intl

Thu 6/4

8:20 pm-6:30 pm

1 stop17h 10m

$665
Quickest round-trip

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 6/12

8:40 am-4:45 pm

1 stop13h 05m

Washington, D.C. Dulles Intl

Tue 6/16

8:20 pm-5:35 pm

1 stop16h 15m

$673

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 6/16

12:15 pm-4:45 pm

1 stop33h 30m

Washington, D.C. Dulles Intl

Sun 6/21

8:20 pm-11:25 am

1 stop34h 05m

$682

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 6/16

6:00 am-3:55 pm

1 stop14h 55m

Washington, D.C. Dulles Intl

Mon 6/22

3:25 pm-11:15 am

1 stop14h 50m

$686

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 5/22

7:20 pm-2:20 pm

2 stops24h 00m

Washington, D.C. Dulles Intl

Thu 6/4

8:20 pm-6:30 pm

1 stop17h 10m

$692

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 5/21

12:10 pm-8:00 pm

1 stop12h 50m

Washington, D.C. Dulles Intl

Wed 6/3

8:29 am-6:55 am

1 stop17h 26m

$695

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Sun 5/24

6:00 am-3:15 pm

1 stop14h 15m

Washington, D.C. Dulles Intl

Sat 6/6

8:15 am-6:55 am

1 stop17h 40m

$697

PortoWashington, D.C.

OPO - DCA

OPODCA

Porto

Fri 5/22

5:00 am-5:07 pm

2 stops17h 07m

Washington, D.C. Reagan-National

Thu 6/4

11:00 am-8:30 am

2 stops16h 30m

$710

PortoBaltimore

OPO - BWI

OPOBWI

Porto

Thu 5/21

5:00 am-7:16 pm

2 stops19h 16m

Baltimore/Washington

Wed 6/3

1:59 pm-10:30 am

2 stops15h 31m

$714

PortoWashington, D.C.

OPO - DCA

OPODCA

Porto

Tue 6/16

1:05 pm-11:21 pm

1 stop15h 16m

Washington, D.C. Reagan-National

Sun 6/21

11:00 am-10:25 am

1 stop18h 25m

$725

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.

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.?

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

The month of March is, on average, the cheapest month to fly to Washington, D.C. from Porto, with most prices found around $422. If you’re not able to fly to Washington, D.C. in March, then October is your next best option. Flight prices from Porto to Washington, D.C. during October average around $467.

Can stopping save me money on Porto to Washington, D.C. flights?

You could potentially save up to 14% on your flight if you consider stops on a Porto to Washington, D.C. flight.

When to book flights from Porto to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Porto to Washington, D.C. 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. (OPO to WAS) flight deals and tips

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

Fastest flight time

12h 10m

Direct flights

None
The fastest flight from Porto to Washington, D.C. takes 12h 10m
There are no direct flights from Porto to Washington, D.C.. There are no popular flight routes from Porto to Washington, D.C..
Search flight deals

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

  • How far is Porto to Washington, D.C. by plane?

    Porto and Washington, D.C. are 3523.1 mi apart from one another. 12h 10m is a normal flight duration for this route.

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

    Prices for flights from Porto Airport to Washington, D.C. refresh daily.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Porto Airport to Washington, D.C..

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

    The necessary travel and health documents for your Washington, D.C. 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.?

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

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?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from Porto with this policy.

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?

If you are not ready to book a flight from Porto to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport