$366 Find Cheap Flights from Portugal to Washington Dulles Airport - Compare and Save

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Cheap Flights from Portugal to Dulles Intl

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Portugal to Dulles Intl

Tue, Dec 22 - Sat, Jan 23
Icelandair Logo
11:40 am - 6:30 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
11h 50m1 stop Reykjavik Keflavik Intl
Icelandair Logo
7:40 pm - 12:50 pmIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
12h 10m1 stop Reykjavik Keflavik Intl
$584Icelandair
Tue, Dec 22 - Sat, Jan 23
Icelandair Logo
11:40 am - 6:30 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
11h 50m1 stop Reykjavik Keflavik Intl
Icelandair Logo
7:40 pm - 12:50 pmIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
12h 10m1 stop Reykjavik Keflavik Intl
$587Icelandair
Tue, Dec 22 - Sat, Jan 23
Icelandair Logo
11:40 am - 6:30 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
11h 50m1 stop Reykjavik Keflavik Intl
Icelandair Logo
7:40 pm - 12:50 pmIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
12h 10m1 stop Reykjavik Keflavik Intl
$590Icelandair
Thu, Nov 26 - Thu, Dec 3
TAP AIR PORTUGAL Logo
8:30 am - 3:15 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
11h 45m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
5:25 pm - 3:00 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
16h 35m1 stop Lisbon Humberto Delgado
$616TAP AIR PORTUGAL
Thu, Nov 19 - Wed, Dec 2
TAP AIR PORTUGAL Logo
7:00 am - 3:15 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
13h 15m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pmIAD  Washington, D.C. Dulles Intl-OPO Porto
13h 30m1 stop Lisbon Humberto Delgado
$618TAP AIR PORTUGAL
Thu, Nov 19 - Sat, Nov 28
Multiple Airlines Logo
10:20 pm - 7:05 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
25h 45m2 stops Sevilla Casablanca Mohamed V
Multiple Airlines Logo
5:25 pm - 5:35 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
7h 10mnonstop
$622Multiple Airlines
Thu, Nov 19 - Thu, Dec 3
TAP AIR PORTUGAL Logo
8:30 am - 3:15 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
11h 45m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
5:25 pm - 10:00 amIAD  Washington, D.C. Dulles Intl-OPO Porto
11h 35m1 stop Lisbon Humberto Delgado
$626TAP AIR PORTUGAL
Thu, Dec 3 - Sat, Dec 12
United Airlines Logo
12:20 pm - 3:40 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
8h 20mnonstop
United Airlines Logo
5:46 pm - 8:10 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
9h 24m1 stop Newark
$692United Airlines
Thu, Dec 3 - Sat, Dec 12
United Airlines Logo
12:20 pm - 3:40 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
8h 20mnonstop
United Airlines Logo
10:30 pm - 10:20 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
6h 50mnonstop
$692United Airlines
Fri, Dec 18 - Sun, Jan 3
United Airlines Logo
5:00 am - 3:55 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
15h 55m1 stop Frankfurt am Main
United Airlines Logo
10:15 pm - 10:05 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
6h 50mnonstop
$727United Airlines
Booking Insights

KAYAK's insights & trends for flights to Dulles Intl

Get data-powered insights and trends for flights to Dulles Intl to help you find the cheapest flights, the best time to fly and much more.

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

Based on KAYAK data, the cheapest day to fly to Washington, D.C. is Friday where round-trip tickets can be as cheap as $858. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $1,061 on average.

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

The cheapest month for flights to Washington, D.C. Dulles Intl Airport is March, where tickets cost $663 on average for return flights. On the other hand, the most expensive months are July and September, where the average cost of tickets from Portugal is $979 and $863 respectively. For one-way flights, the best month to travel is March with an average price of $539.

What is the cheapest time of day to fly to Washington, D.C. Dulles Intl Airport?

The cheapest time of day to fly to Washington, D.C. Dulles Intl Airport is generally in the evening, when round-trip flights cost $713 on average. The most expensive time of day to fly to Washington, D.C. Dulles Intl Airport is generally in the morning, which is peak travel time and where the average cost of a ticket is $976.

What is a good deal for flights to Washington, D.C. Dulles Intl Airport?

If you’re looking for cheap airfare to Washington, D.C. Dulles Intl Airport, 25% of our users found tickets to Washington, D.C. Dulles Intl Airport for the following prices or less: From Lisbon $740 round-trip.

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

To get a below average price, you should book around 3 weeks before departure, which saves you about 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low season

January

Cheapest flight

$366
Best time to beat the crowds but there is an average 11% increase in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Lisbon to Washington, D.C.

FAQs - booking Washington Dulles Airport flights

  • How far is Washington, D.C. Dulles Intl Airport from central Washington, D.C.?

    There are 22 miles between Washington, D.C. city center and Washington, D.C. Dulles Intl Airport.

  • How much is a flight to Washington, D.C.?

    On average, a flight to Washington, D.C. costs $992. The cheapest price found on KAYAK in the last 2 weeks cost $630 and departed from Lisbon Humberto Delgado Airport.

  • How does KAYAK find such low prices on flights to Washington Dulles Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Washington Dulles Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Washington Dulles Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Washington Dulles Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Washington Dulles Airport

  • Looking for cheap airfare to Washington Dulles Airport? 25% of our users found round-trip tickets to Washington Dulles Airport for the following prices or less: From Lisbon $1,196

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Washington Dulles Airport flight deals.

Reviews of the top airlines flying from Portugal to Dulles Intl

 
Need help choosing which airline to fly with to Dulles Intl? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.3
United AirlinesOverall score based on 10453 reviews
7.1Entertainment
6.7Food
7.7Boarding
7.3Comfort
8.1Crew
Airline reviews

Worst boarding experience, flight extremely delayed causing super tight connect and deplaning was a disaster as ppl were pushing and shoving to get off. Then after flying over 8 hours had to get off a job to next flight. Limited beverage service in Business class (water or white wine) no food. The plane was very cold (temperature) so uncomfortable

2.0 MediocreValerie, Oct 2026
Read more United Airlines reviews

Worst boarding experience, flight extremely delayed causing super tight connect and deplaning was a disaster as ppl were pushing and shoving to get off. Then after flying over 8 hours had to get off a job to next flight. Limited beverage service in Business class (water or white wine) no food. The plane was very cold (temperature) so uncomfortable

The business class service was very good. The crew was helpful and the food was enjoyable. Boarding was well organized.

Entertainment was great. Seats were good. They did not have my pre-ordered hot food product available but did comp me something cold in place of the item.

No water or beverage was provided. I had to ask for water. The sole flight attendant had more interest in selling the credit card. In addition when we got to Dulles the plane and gate were misaligned and it took at least 15 minutes to get off the plane.

Flight was delayed almost an hour because the cleaning crew broke one of the bathroom doors.

When we boarded we were treated with care and it never stopped. Got towels before breakfast and after snacks was a lovely touch!

Our flight was delayed 2.5 hours from Lisbon to DC so we missed our connection to Seattle that would have arrived at about 9 PM. The agent initially said we had to stay overnight in DC and there were no other options to put us on to get us to Seattle. While on board I discovered a flight via American he could have put us in but by the time we arrived in DC that was sold out. We were then put on a flight to San Francisco that was also delayed then arrived in San Francisco and our flight to Seattle was also delayed so we ended up not arriving until 2:15 am. Our son could not pick us up so we ended up having to pay over $100 to Uber home. This is the second trip with United that the flight has been delayed causing us to miss an evening in Las Vegas and we were given nothing.

I would have liked an opportunity to move to a different seat ( even would have checked in my hand luggage)as I had health issues where I didn't have to clamber over the passenger next to me to for toilet use/ movement [ She was a highly unpleasant neighbor to sit next to]. In addition, I found that my European phone plan had run out of data and so I was not receiving emails from yourselves on airport wifi to be able to check in online and verifications difficult as did not accept the ticket number I had. I asked for an extra blanket but was told there was none. Then I saw other passengers receiving them. I couldn't eat the food and asked for snacks : Stewardess said " on the way" but they did not bring. The best bit was the check in process in Lisbon. Very efficient. However, I did not understand why we had to collect our bags at Washington then go through customs again. It was not explained. I also with my leg and health issue had approximately mile walk to the gate ( which then changed) . There appeared to be no moving walkways or help provided.

United left one of our bags back in SFO but that’s not my real complaint. The complaint is how it all went down. So we checked in the day before online and were told we could use the quick drop for luggage. So the next day I used baggage quick drop curbside at SFO. The agent mistakenly didn't tag my bag as he put my bag on the conveyor belt untagged. We immediately alerted him he had not tagged the bag. I walked with him to the baggage service office to find my bag and tag it. We waited outside the office for 10 mins. He came out and said everything was ok and the bag was going to be tagged and on my flight. We received a text that one of our bags was on the flight but the other was not. I alerted my first class flight attendant immediately upon boarding the flight. She was helpful and said she’d get it sorted out right away. She called over the gate agent. The gate agent used my bag number and looked over information on her device. She said my bag was on the flight. The flight attendant was standing with her, looking at the device, and also said “yep it’s on the flight”. During the flight the flight attendant made reference to how reassuring it must feel knowing the bag was on the flight. Upon arriving to IAD we received a text that my bag was not on my flight. The text said my bag would arrive to my final destination LIS 24 hrs late. I understand that mistakes happen. I was totally ok with my bag mistakenly not getting tagged at the quick drop. I was fine with walking down to baggage services to tag my bag. But, what I am not ok with is that the United staff said they fixed the mistake two different times, assuring me twice that my bag would be/was on the plane…and it wasn’t. I expected better attention by the employees, for them to do what they said they were going to do. We also spent extra money to upgrade our seats to first class, including the entire return leg from Lisbon to San Francisco because we wanted a smoother and more relaxing travel experience. Our money was not well spent. We will not be using United for travel going forward.

One of the best flying experiences I’ve ever had.

They ran out of food and on the flight back to NY there was no wifi nor any socket to connect your plug to charge your phone. Also the crew was not friendly as they did not want to throw out my empty water bottle after she told me to hold on to it and then said no.

Boarding slow and chaotic. Food was terrible. Flight attendants were nice. Sears were comfortable.

I feel like the boarding process could be a little better. But the staff and everyone does a really great job.

Flight was good. Would be great if we had free WiFi

Flight was late, and not sure why. The business class lounge in Porto is not proprietary to TAP, and is really substandard, almost as bad as "The Lounge" in Boston. It was a D, which is better than the F experience in Bostonm where we left "The Lounge" for a better experience in the terminal. It had better food (an extremely low bar), ok beverages, and wasn't as crowded as the Boston one, but no restrooms. To use one, you had to leave and go downstairs. There's no down escalator, and the elevator might be able to crowd 4 people. Otherwise, you're carying your bags down the stairs. I hope the Lisbon club is better, but for TAP to provide this in the 2nd largest city in the home country is disappointing. They put out an announcement to proceed immediately to the gate, but there was no plane and few seats. from the lounge, 8 people with bags waited in line for the single tiny elevator. After almost an hour of standing, we finally boarded. TAP, at least on this plane, doesn't offer a welcome drink to business class passengers. Having said that, the crew was very friendly and accomodating. We landed about an hour late and then were told we were going to be on the runway for at least a half hour because no gate was available. So, bottom line, D- for pre boarding, A for flight attendents, B + for business class food, and Incomplete for post landing.

Special meal AVML was terrible Move selections were mediocre No Wi-Fi offered

The cabin crew were curt, not with me, but observed with other passengers. They were unduly rude and it was unprovoked and when they realized they were wrong, they made no attempt to apologize for their own confusion.

I was disappointed of the crew, not friendly and attentive. Delay one way for fuel leakage and the plane is so hot. Not that great all around but I’m glad I experienced it so now know better.

Flight delayed by >1 hour. Long boarding involving riding a shuttle to the plane.

Packing people into a bus like sardines and then making them wait for at least 10-15 minutes before driving them to a location a mile away is not the way a national airline should represent itself. And it seems like everyone chosen for additional screening was a woman. What is up with that?

Traveling to a place near Dulles Intl?

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Winchester
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Hanover
Springfield
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Greenbelt
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Camp Springs
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Lutherville Timonium

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