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Cheap flights from Porto to Washington, D.C. from $403

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 10/13. 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.
Multiple Airlines Logo
5:00 am - 3:45 pm
OPO
-
IAD
15h 45m
1 stop
Multiple Airlines Logo
6:40 pm - 10:35 am
IAD
-
OPO
10h 55m
1 stop
$626Multiple Airlines
Tue, Nov 24 - Sat, Dec 5
KLM Logo
4:10 pm - 3:55 pm
OPO
-
IAD
28h 45m
1 stop
KLM Logo
7:59 pm - 3:25 pm
IAD
-
OPO
14h 26m
2 stops
$636KLM
Tue, Nov 24 - Sat, Dec 5
Delta Logo
5:00 am - 11:02 pm
OPO
-
IAD
23h 02m
2 stops
Delta Logo
12:30 pm - 10:30 am
IAD
-
OPO
17h 00m
2 stops
$650Delta
Tue, Nov 24 - Sat, Dec 5
KLM Logo
11:30 am - 3:35 pm
OPO
-
IAD
33h 05m
1 stop
KLM Logo
9:45 pm - 10:15 pm
IAD
-
OPO
19h 30m
1 stop
$712KLM
Tue, Jul 21 - Mon, Jul 27
American Airlines Logo
8:20 am - 6:50 pm
OPO
-
IAD
15h 30m
1 stop
American Airlines Logo
5:00 pm - 11:45 am
IAD
-
OPO
13h 45m
1 stop
$714American Airlines
Tue, Jul 21 - Mon, Jul 27
KLM Logo
11:30 am - 3:35 pm
OPO
-
IAD
33h 05m
1 stop
KLM Logo
9:45 pm - 10:15 pm
IAD
-
OPO
19h 30m
1 stop
$715KLM
Tue, Jul 21 - Mon, Jul 27
American Airlines Logo
8:20 am - 6:55 pm
OPO
-
IAD
15h 35m
1 stop
American Airlines Logo
5:00 pm - 11:45 am
IAD
-
OPO
13h 45m
1 stop
$716American Airlines
Thu, Jul 2 - Sat, Jul 18
Delta Logo
5:55 am - 7:35 pm
OPO
-
IAD
18h 40m
1 stop
Delta Logo
9:45 pm - 3:25 pm
IAD
-
OPO
12h 40m
1 stop
$719Delta
Fri, Jul 24 - Tue, Aug 11
Delta Logo
5:55 am - 7:35 pm
OPO
-
IAD
18h 40m
1 stop
Delta Logo
9:45 pm - 3:25 pm
IAD
-
OPO
12h 40m
1 stop
$721Delta
Fri, Jul 24 - Tue, Aug 11
Multiple Airlines Logo
8:40 pm - 3:30 pm
OPO
-
IAD
23h 50m
1 stop
Multiple Airlines Logo
8:30 pm - 11:45 am
IAD
-
OPO
10h 15m
1 stop
$724Multiple Airlines
Thu, Jul 16 - Thu, Jul 23

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

Our best KLM deals on Porto to Washington, D.C. Dulles Intl Airport flight tickets
KLM
Nov 24
OPO4:10 pmPorto
28h 45m
1 stop
IAD3:55 pmWashington, D.C. Dulles Intl
Dec 5
IAD7:59 pmWashington, D.C. Dulles Intl
14h 26m
2 stops
OPO3:25 pmPorto
$636
KLM
Jun 22
OPO11:25 amPorto
33h 10m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Jul 7
IAD9:45 pmWashington, D.C. Dulles Intl
19h 20m
1 stop
OPO10:05 pmPorto
$655
KLM
Jul 21
OPO11:30 amPorto
33h 05m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Jul 27
IAD9:45 pmWashington, D.C. Dulles Intl
19h 30m
1 stop
OPO10:15 pmPorto
$712

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

Our best Air Canada deals on Porto to Washington, D.C. Dulles Intl Airport flight tickets
Air Canada
Jul 11
OPO11:20 amPorto
14h 04m
2 stops
IAD8:24 pmWashington, D.C. Dulles Intl
Nov 25
IAD1:20 pmWashington, D.C. Dulles Intl
16h 55m
2 stops
OPO11:15 amPorto
$781
Air Canada
Jun 22
OPO11:15 amPorto
14h 09m
2 stops
IAD8:24 pmWashington, D.C. Dulles Intl
Jul 7
IAD5:34 pmWashington, D.C. Dulles Intl
17h 11m
2 stops
OPO3:45 pmPorto
$807
Air Canada
Jul 21
OPO12:15 pmPorto
13h 58m
2 stops
IAD9:13 pmWashington, D.C. Dulles Intl
Jul 27
IAD8:18 amWashington, D.C. Dulles Intl
17h 42m
2 stops
OPO7:00 amPorto
$821

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 June 18, 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
Quickest round-trip

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 11/24

5:00 am-3:45 pm

1 stop15h 45m

Washington, D.C. Dulles Intl

Sat 12/5

6:40 pm-10:35 am

1 stop10h 55m

$626

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 11/24

4:10 pm-3:55 pm

1 stop28h 45m

Washington, D.C. Dulles Intl

Sat 12/5

7:59 pm-3:25 pm

2 stops14h 26m

$636

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 11/24

5:00 am-11:02 pm

2 stops23h 02m

Washington, D.C. Dulles Intl

Sat 12/5

12:30 pm-10:30 am

2 stops17h 00m

$650

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 7/21

11:30 am-3:35 pm

1 stop33h 05m

Washington, D.C. Dulles Intl

Mon 7/27

9:45 pm-10:15 pm

1 stop19h 30m

$712

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 7/21

8:20 am-6:50 pm

1 stop15h 30m

Washington, D.C. Dulles Intl

Mon 7/27

5:00 pm-11:45 am

1 stop13h 45m

$714

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Tue 7/21

11:30 am-3:35 pm

1 stop33h 05m

Washington, D.C. Dulles Intl

Mon 7/27

9:45 pm-10:15 pm

1 stop19h 30m

$715

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 7/2

8:20 am-6:55 pm

1 stop15h 35m

Washington, D.C. Dulles Intl

Sat 7/18

5:00 pm-11:45 am

1 stop13h 45m

$716

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 7/24

5:55 am-7:35 pm

1 stop18h 40m

Washington, D.C. Dulles Intl

Tue 8/11

9:45 pm-3:25 pm

1 stop12h 40m

$719

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Fri 7/24

5:55 am-7:35 pm

1 stop18h 40m

Washington, D.C. Dulles Intl

Tue 8/11

9:45 pm-3:25 pm

1 stop12h 40m

$721

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Thu 7/16

8:40 pm-3:30 pm

1 stop23h 50m

Washington, D.C. Dulles Intl

Thu 7/23

8:30 pm-11:45 am

1 stop10h 15m

$724

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

18h 33m

Direct flights

None
The fastest flight from Porto to Washington, D.C. Dulles Intl Airport takes 18h 33m
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 18h 33m.

  • 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
Fredericksburg
Gaithersburg
Colonial Beach
Rockville
Linthicum Heights
Silver Spring
Towson
Manassas
Sterling
Tysons
Springfield
Bethesda

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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