$401 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

Sat, Dec 19 - Fri, Jan 1
Iberia Logo
6:30 am - 4:20 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
14h 50m1 stop Madrid Barajas
Iberia Logo
5:50 pm - 4:05 pmIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
17h 15m1 stop Madrid Barajas
$541Iberia
Thu, Oct 8 - Sat, Oct 17
Iberia Logo
6:35 am - 6:50 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
17h 15m1 stop Madrid Barajas
Iberia Logo
5:00 pm - 11:50 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
13h 50m1 stop Madrid Barajas
$557Iberia
Sat, Nov 21 - Sat, Jan 9
Multiple Airlines Logo
6:30 am - 4:20 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
14h 50m1 stop Madrid Barajas
Multiple Airlines Logo
6:05 pm - 2:55 pmIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
15h 50m1 stop London Heathrow
$570Multiple Airlines
Thu, Oct 8 - Sat, Oct 17
TAP AIR PORTUGAL Logo
11:40 am - 3:10 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
8h 30mnonstop
TAP AIR PORTUGAL Logo
10:35 pm - 10:55 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
7h 20mnonstop
$574TAP AIR PORTUGAL
Thu, Oct 8 - Sat, Oct 17
TAP AIR PORTUGAL Logo
11:40 am - 3:10 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
8h 30mnonstop
TAP AIR PORTUGAL Logo
10:35 pm - 10:55 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
7h 20mnonstop
$579TAP AIR PORTUGAL
Thu, Oct 8 - Sat, Oct 17
TAP AIR PORTUGAL Logo
5:15 pm - 8:35 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
8h 20mnonstop
TAP AIR PORTUGAL Logo
10:35 pm - 10:55 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
7h 20mnonstop
$580TAP AIR PORTUGAL
Mon, Nov 2 - Mon, Nov 16
Delta Logo
5:00 am - 3:55 pmOPO  Porto-IAD Washington, D.C. Dulles Intl
15h 55m1 stop Amsterdam Schiphol
Delta Logo
6:40 pm - 10:35 amIAD  Washington, D.C. Dulles Intl-OPO Porto
10h 55m1 stop Paris Charles de Gaulle
$581Delta
Sat, Sep 26 - Sat, Sep 26
United Airlines Logo
12:20 pm - 3:20 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
8h 00mnonstop
United Airlines Logo
10:40 pm - 8:20 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
28h 40m1 stop Newark
$704United Airlines
Wed, Oct 21 - Tue, Apr 6
United Airlines Logo
6:45 am - 4:05 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
14h 20m1 stop Frankfurt am Main
United Airlines Logo
5:20 pm - 8:20 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
10h 00m1 stop Newark
$715United Airlines
Thu, Oct 8 - Tue, Oct 13
United Airlines Logo
5:05 am - 3:10 pmLIS  Lisbon Humberto Delgado-IAD Washington, D.C. Dulles Intl
15h 05m1 stop Frankfurt am Main
United Airlines Logo
10:25 pm - 10:30 amIAD  Washington, D.C. Dulles Intl-LIS Lisbon Humberto Delgado
7h 05mnonstop
$715United 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 flight to Washington Dulles Airport?

In the last 5 days, the cheapest flight deal to Washington Dulles Airport was found on the route from Porto, at $541 return. The most popular connection is from Lisbon to Washington Dulles Airport and KAYAK users have found round-trip deals for as low as $541 in the last 5 days.

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 $1,084 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 November, where tickets cost $660 on average for return flights. On the other hand, the most expensive months are January and July, where the average cost of tickets from Portugal is $1,085 and $979 respectively. For one-way flights, the best month to travel is March with an average price of $547.

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 $705 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 $975.

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 $744 round-trip.

Good to know

Low season

January

Cheapest flight

$401
Best time to beat the crowds but there is an average 61% increase in price.
Most popular time to fly with an average 31% increase in price.
Flight from Porto to Washington Dulles Airport

FAQs - booking Washington Dulles Airport flights

  • What is the cheapest flight to Washington Dulles Airport?

    In the last 5 days, the cheapest flight deal to Washington Dulles Airport was found on the route from Porto, at $541 return. The most popular connection is from Lisbon to Washington Dulles Airport and KAYAK users have found round-trip deals for as low as $541 in the last 5 days.

  • 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 $964. The cheapest price found on KAYAK in the last 2 weeks cost $615 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 $1,548
  • 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.
7.4
United AirlinesOverall score based on 10209 reviews
7.1Entertainment
8.1Crew
7.7Boarding
6.7Food
7.3Comfort
Airline reviews

Awful!!!. I do not recommend United. The flight staff are unhappy and don't attempt to make the passengers feel comfortable or welcome. The food is not edible, and the seats are miserable. My expensive luggage was destroyed, and the ticket prices are too much for the experience.

4.0 OkayJohn, Sep 2026
Read more United Airlines reviews

Awful!!!. I do not recommend United. The flight staff are unhappy and don't attempt to make the passengers feel comfortable or welcome. The food is not edible, and the seats are miserable. My expensive luggage was destroyed, and the ticket prices are too much for the experience.

On time, easy boarding. Anytime you sit in an economy seat, it’s uncomfortable. New plane and the bathrooms were in the galley at the back of the plane which seemed odd.

Did not like the check in guy quibbling over a couple pounds at the luggage weigh in

Just having a little bit more legroom would've been nice.

This is related to my second leg of the flight, from Washington DC to SFO. I understand things happen, but I got home at 3 am for a 12:59 am landing. I live 10 min from the airport. Bridge breaks when a few rows of the plane are off? Maintenance didn’t catch that?

Great Brasilia aircraft - not a Boeing 757 like the next part of the flight. Flight from MCI to IAD was great, on-time, comfortable, did I mention that? The flight from IAD to EDI was painful. One of the reasons I won't fly United again? Boeing 757, with a seat pitch and material that was horrendous. Worst aircraft ever, made worse by United sardine-can tight seating. Oh, and the connection window, 45 minutes, really? At IAD, in different concourses? What idiot came up with that flight scenario? Happily, (for me and my travel insurance people) the flight was late (reminiscent of American Airlines). The crew was professional and courteous.

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.

Flight was delayed more than 1.5 hours. Essentially no communication with passengers regarding how long the delay would last or any updates as to the delay.

Clearer signage at Lisbon Airport and more communication about delays

Flight smooth and on-time. Food a joke, crew humorless but efficient. Really a budget airline masquerading as a flagship, but it gets you there.

Overall ok experience as couple feedback: for improvement: 1. The vegetarian food was less and ran out, so many of us didn’t get it. Not all the crew member were polite and could be more hospitable.

The flight was excellent because I chose to upgrade to Business Class. The only negative drawback was because I upgrade, it screwed their system up and they lost my luggage for 2 days, but it was then recovered.

Web site needs improvement Plane was clean and modern Lay Flat beds were hard and not to comfortable (business class )

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?

Book flights to Dulles Intl if you plan to visit one of these locations
Winchester
Linthicum Heights
Hanover
Springfield
Gaithersburg
Towson
Martinsburg
Oxon Hill
Owings Mills
Charles Town
Greenbelt
Glen Burnie
Edgewood
Chesapeake Beach
Camp Springs
Ellicott City
Pikesville
Hunt Valley
Colonial Beach
Capitol Heights

More options for your flight to Dulles Intl