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Cheap flights from Portugal to Washington, D.C. from $357

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portugal to Washington, D.C. departing on 3/14. 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 Portugal to Washington, D.C.

Recent round-trip flight deals from Portugal to Washington, D.C.

TAP AIR PORTUGAL Logo
8:00 pm - 2:35 pmOPO-IAD
23h 35m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pmIAD-OPO
13h 30m1 stop
$493TAP AIR PORTUGAL
Find Deal
Mon, Nov 3 - Sun, Nov 16
TAP AIR PORTUGAL Logo
4:10 pm - 2:35 pmOPO-IAD
27h 25m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 10:00 amIAD-OPO
30h 30m1 stop
$510TAP AIR PORTUGAL
Find Deal
Mon, Nov 3 - Sun, Nov 16
Multiple Airlines Logo
6:30 am - 7:20 pmLIS-IAD
17h 50m2 stops
Multiple Airlines Logo
9:45 pm - 5:40 pmIAD-LIS
14h 55m1 stop
$520Multiple Airlines
Find Deal
Fri, Nov 21 - Tue, Dec 2
Multiple Airlines Logo
7:00 am - 3:35 pmLIS-IAD
13h 35m1 stop
Multiple Airlines Logo
6:20 pm - 2:45 pmIAD-LIS
15h 25m1 stop
$521Multiple Airlines
Find Deal
Thu, Dec 18 - Thu, Jan 8
American Airlines Logo
6:45 pm - 4:30 pmLIS-IAD
26h 45m1 stop
American Airlines Logo
9:45 pm - 2:50 pmIAD-LIS
12h 05m1 stop
$523American Airlines
Find Deal
Sat, Dec 6 - Sun, Dec 14
British Airways Logo
6:30 am - 7:21 pmLIS-IAD
17h 51m2 stops
British Airways Logo
9:45 pm - 9:55 pmIAD-LIS
19h 10m1 stop
$524British Airways
Find Deal
Thu, Nov 6 - Thu, Nov 13
British Airways Logo
7:05 am - 3:35 pmLIS-IAD
13h 30m1 stop
British Airways Logo
6:20 pm - 2:55 pmIAD-LIS
15h 35m1 stop
$526British Airways
Find Deal
Wed, Nov 5 - Mon, Nov 10
American Airlines Logo
10:40 am - 7:21 pmLIS-IAD
13h 41m2 stops
American Airlines Logo
6:20 pm - 5:55 pmIAD-LIS
18h 35m1 stop
$530American Airlines
Find Deal
Sat, Nov 8 - Sat, Nov 15
United Airlines Logo
6:45 am - 3:50 pmLIS-IAD
14h 05m1 stop
United Airlines Logo
11:05 pm - 10:15 amIAD-LIS
7h 10mnonstop
$576United Airlines
Find Deal
Tue, Oct 21 - Tue, Oct 28
United Airlines Logo
5:00 am - 3:50 pmLIS-IAD
15h 50m1 stop
United Airlines Logo
10:05 pm - 10:15 amIAD-LIS
7h 10mnonstop
$577United Airlines
Find Deal
Mon, Dec 22 - Tue, Dec 30

Air France flights from Portugal to Washington, D.C. Dulles Intl Airport

Our best Air France deals on Portugal to Washington, D.C. Dulles Intl Airport flight tickets
Air France
Oct 7
LIS9:50 amLisbon Humberto Delgado
14h 25m
1 stop
IAD7:15 pmWashington, D.C. Dulles Intl
Oct 13
IAD6:30 pmWashington, D.C. Dulles Intl
11h 45m
1 stop
LIS11:15 amLisbon Humberto Delgado
$534
Find similar
Air France
Oct 10
OPO9:20 amPorto
14h 55m
1 stop
IAD7:15 pmWashington, D.C. Dulles Intl
Oct 15
IAD9:20 pmWashington, D.C. Dulles Intl
30h 05m
1 stop
OPO8:25 amPorto
$548
Find similar
Air France
Sep 27
LIS9:45 amLisbon Humberto Delgado
14h 30m
1 stop
IAD7:15 pmWashington, D.C. Dulles Intl
Sep 30
IAD9:20 pmWashington, D.C. Dulles Intl
12h 30m
1 stop
LIS2:50 pmLisbon Humberto Delgado
$636
Find similar

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

Our best KLM deals on Portugal to Washington, D.C. Dulles Intl Airport flight tickets
KLM
Oct 9
LIS5:00 amLisbon Humberto Delgado
15h 35m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Oct 12
IAD5:25 pmWashington, D.C. Dulles Intl
12h 30m
1 stop
LIS10:55 amLisbon Humberto Delgado
$539
Find similar
KLM
Oct 9
OPO6:30 amPorto
14h 05m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Oct 14
IAD6:30 pmWashington, D.C. Dulles Intl
16h 00m
1 stop
OPO3:30 pmPorto
$544
Find similar
KLM
Oct 23
LIS7:30 pmLisbon Humberto Delgado
25h 05m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Oct 30
IAD7:05 pmWashington, D.C. Dulles Intl
11h 30m
1 stop
LIS10:35 amLisbon Humberto Delgado
$545
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portugal 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 25, 2025.
Use the filters below to find and compare flights from Portugal 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

Mon 11/3

8:00 pm-2:35 pm

1 stop23h 35m

Washington, D.C. Dulles Intl

Sun 11/16

10:30 pm-5:00 pm

1 stop13h 30m

$493

PortoWashington, D.C.

OPO - IAD

OPOIAD

Porto

Mon 11/3

4:10 pm-2:35 pm

1 stop27h 25m

Washington, D.C. Dulles Intl

Sun 11/16

10:30 pm-10:00 am

1 stop30h 30m

$510

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Fri 11/21

6:30 am-7:20 pm

2 stops17h 50m

Washington, D.C. Dulles Intl

Tue 12/2

9:45 pm-5:40 pm

1 stop14h 55m

$520

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Thu 12/18

7:00 am-3:35 pm

1 stop13h 35m

Washington, D.C. Dulles Intl

Thu 1/8

6:20 pm-2:45 pm

1 stop15h 25m

$521

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sat 12/6

6:45 pm-4:30 pm

1 stop26h 45m

Washington, D.C. Dulles Intl

Sun 12/14

9:45 pm-2:50 pm

1 stop12h 05m

$523

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Thu 11/6

6:30 am-7:21 pm

2 stops17h 51m

Washington, D.C. Dulles Intl

Thu 11/13

9:45 pm-9:55 pm

1 stop19h 10m

$524

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Wed 11/5

7:05 am-3:35 pm

1 stop13h 30m

Washington, D.C. Dulles Intl

Mon 11/10

6:20 pm-2:55 pm

1 stop15h 35m

$526

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Sat 11/8

10:40 am-7:21 pm

2 stops13h 41m

Washington, D.C. Dulles Intl

Sat 11/15

6:20 pm-5:55 pm

1 stop18h 35m

$530

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Tue 10/21

6:45 am-3:50 pm

1 stop14h 05m

Washington, D.C. Dulles Intl

Tue 10/28

11:05 pm-10:15 am

Nonstop7h 10m

$576

LisbonWashington, D.C.

LIS - IAD

LISIAD

Lisbon Humberto Delgado

Mon 12/22

5:00 am-3:50 pm

1 stop15h 50m

Washington, D.C. Dulles Intl

Tue 12/30

10:05 pm-10:15 am

Nonstop7h 10m

$577

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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Portugal 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, March is the cheapest month to fly from Portugal 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 $606. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of March, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $636.

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Sunday 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 $715. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Portugal to Washington, D.C. Dulles Intl Airport for around $881.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Portugal at noon is the least expensive time of day to depart. momondo users have found prices as low as $484 when looking at flights departing at noon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $782 on average. Flights to Washington, D.C. Dulles Intl Airport from Portugal in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Portugal to Washington, D.C. Dulles Intl flight route?

Fly from Lisbon Humberto Delgado to Washington, D.C. Dulles Intl for the best Portugal - Washington, D.C. Dulles Intl flight prices

How far in advance should I book a flight to Washington, D.C. Dulles Intl Airport?

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Portugal when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $729 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Portugal for as low as $581 on momondo.

What cabin class options are available on Portugal to Washington, D.C. Dulles Intl flights?

There are 3 cabin classes available to choose from on Portugal to Washington, D.C. Dulles Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Portugal to Washington, D.C. Dulles Intl Airport flights?

No. A direct flight is the cheapest option for a flight between Portugal to Washington, D.C. Dulles Intl Airport.

Cheap Portugal to Washington, D.C. Dulles Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portugal to Washington, D.C. Dulles Intl Airport

Best Price Found

$377

Fastest flight time

8h 20m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from Portugal in the past 72 hours is $377. The best round-trip flight deal from Portugal to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $701.
The fastest flight from Portugal to Washington, D.C. Dulles Intl Airport takes 8h 20m
Direct flights go from Portugal to Washington, D.C. Dulles Intl Airport every day.
Search flight deals

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

    Prices for flights from Portugal to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Portugal to Washington, D.C. Dulles Intl Airport?

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Portugal 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 plane model from Portugal to Washington, D.C. Dulles Intl Airport?

Best airlines flying from Portugal to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Portugal to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
TAP AIR PORTUGALPriceFrom $480Free CancellationRating
7.1
1,990 reviews
Search TAP AIR PORTUGAL flights
United AirlinesPriceFrom $534Free CancellationRating
7.4
8,928 reviews
Search United Airlines 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
National Harbor
Arlington
Winchester
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Harpers Ferry
Towson
Rockville
Manassas
Fairfax
Reston
Glen Burnie
Gaithersburg

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Portugal to Washington, D.C.. momondo saves you time and could save you money on your trip.

Can I find flights from Portugal to Washington, D.C. with flexible booking policies on momondo?

Yes. All flights to Washington, D.C. from Portugal on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from Portugal.

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

Yes momondo offers price alerts on flights to Washington, D.C. from Portugal. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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