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Cheap flights from Porto to Washington, D.C. from $353

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 9/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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

Cheap round-trip flights

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
6:00 pm - 4:15 pm-
26h 15m
TAP AIR PORTUGAL Logo
10:30 pm - 1:30 pm-
10h 00m
$572TAP AIR PORTUGAL
Fri, Oct 30 - Wed, Nov 18
TAP AIR PORTUGAL Logo
7:00 am - 3:10 pm-
13h 10m
TAP AIR PORTUGAL Logo
10:35 pm - 8:25 pm-
16h 50m
$577TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
7:00 am - 8:35 pm-
18h 35m
TAP AIR PORTUGAL Logo
5:40 pm - 10:00 am-
11h 20m
$577TAP AIR PORTUGAL
Thu, Sep 17 - Sun, Sep 20
TAP AIR PORTUGAL Logo
9:00 am - 3:10 pm-
11h 10m
TAP AIR PORTUGAL Logo
10:35 pm - 5:00 pm-
13h 25m
$580TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
8:00 pm - 2:45 pm-
23h 45m
TAP AIR PORTUGAL Logo
5:25 pm - 10:00 am-
11h 35m
$581TAP AIR PORTUGAL
Mon, Nov 2 - Tue, Nov 10
TAP AIR PORTUGAL Logo
11:00 am - 8:35 pm-
14h 35m
TAP AIR PORTUGAL Logo
10:35 pm - 5:00 pm-
13h 25m
$581TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
7:00 am - 3:10 pm-
13h 10m
TAP AIR PORTUGAL Logo
10:35 pm - 8:25 pm-
16h 50m
$582TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
7:00 am - 8:35 pm-
18h 35m
TAP AIR PORTUGAL Logo
10:35 pm - 11:10 pm-
19h 35m
$585TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
Multiple Airlines Logo
12:25 pm - 6:55 pm-
11h 30m
Multiple Airlines Logo
5:00 pm - 11:45 am-
13h 45m
$612Multiple Airlines
Thu, Sep 17 - Wed, Sep 30
Multiple Airlines Logo
7:00 am - 8:35 pm-
18h 35m
Multiple Airlines Logo
10:35 pm - 11:50 pm-
20h 15m
$614Multiple Airlines
Thu, Sep 17 - Wed, Sep 30

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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
Aug 19
OPO6:45 pmPorto
27h 00m
1 stop
IAD4:45 pmWashington, D.C. Dulles Intl
Aug 29
IAD8:20 pmWashington, D.C. Dulles Intl
17h 10m
1 stop
OPO6:30 pmPorto
$728
SWISS
Aug 19
OPO12:15 pmPorto
33h 30m
1 stop
IAD4:45 pmWashington, D.C. Dulles Intl
Aug 27
IAD8:20 pmWashington, D.C. Dulles Intl
17h 10m
1 stop
OPO6:30 pmPorto
$742
SWISS
Aug 20
OPO7:20 pmPorto
25h 10m
1 stop
IAD3:30 pmWashington, D.C. Dulles Intl
Aug 29
IAD8:20 pmWashington, D.C. Dulles Intl
17h 10m
1 stop
OPO6:30 pmPorto
$750

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
Sep 17
OPO6:00 amPorto
14h 10m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
Sep 30
IAD12:43 pmWashington, D.C. Dulles Intl
13h 17m
1 stop
OPO7:00 amPorto
$729
United Airlines
Sep 17
OPO6:00 amPorto
14h 10m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
Sep 24
IAD10:40 pmWashington, D.C. Dulles Intl
27h 30m
2 stops
OPO7:10 amPorto
$730
United Airlines
Sep 17
OPO6:00 amPorto
14h 10m
1 stop
IAD3:10 pmWashington, D.C. Dulles Intl
Sep 24
IAD3:25 pmWashington, D.C. Dulles Intl
14h 50m
1 stop
OPO11:15 amPorto
$731

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 August 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

Fri 10/30

6:00 pm-4:15 pm

1 stop26h 15m

Washington, D.C. Dulles Intl

Wed 11/18

10:30 pm-1:30 pm

1 stop10h 00m

$572

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

7:00 am-3:10 pm

1 stop13h 10m

Washington, D.C. Dulles Intl

Wed 9/30

10:35 pm-8:25 pm

1 stop16h 50m

$577

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

7:00 am-8:35 pm

1 stop18h 35m

Washington, D.C. Dulles Intl

Sun 9/20

5:40 pm-10:00 am

1 stop11h 20m

$577
Quickest round-trip

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

9:00 am-3:10 pm

1 stop11h 10m

Washington, D.C. Dulles Intl

Wed 9/30

10:35 pm-5:00 pm

1 stop13h 25m

$580

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 11/2

8:00 pm-2:45 pm

1 stop23h 45m

Washington, D.C. Dulles Intl

Tue 11/10

5:25 pm-10:00 am

1 stop11h 35m

$581

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

11:00 am-8:35 pm

1 stop14h 35m

Washington, D.C. Dulles Intl

Wed 9/30

10:35 pm-5:00 pm

1 stop13h 25m

$581

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

7:00 am-3:10 pm

1 stop13h 10m

Washington, D.C. Dulles Intl

Wed 9/30

10:35 pm-8:25 pm

1 stop16h 50m

$582

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

7:00 am-8:35 pm

1 stop18h 35m

Washington, D.C. Dulles Intl

Wed 9/30

10:35 pm-11:10 pm

1 stop19h 35m

$585

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

12:25 pm-6:55 pm

1 stop11h 30m

Washington, D.C. Dulles Intl

Wed 9/30

5:00 pm-11:45 am

1 stop13h 45m

$612

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 9/17

7:00 am-8:35 pm

2 stops18h 35m

Washington, D.C. Dulles Intl

Wed 9/30

10:35 pm-11:50 pm

2 stops20h 15m

$614

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 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

13h 00m

Direct flights

None
The fastest flight from Porto to Washington, D.C. Dulles Intl Airport takes 13h 00m
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 13h 00m.

  • 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
Arlington
Gettysburg
Winchester
Waldorf
Laurel
Woodbridge
Fredericksburg
Gaithersburg
Linthicum Heights
Rockville
Silver Spring
Towson
Sterling
Colonial Beach
Springfield
Fairfax
Tysons
Edgewood

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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