$269 Find Cheap Flights from Washington Dulles Airport to Portugal - Compare and Save

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Cheap Flights from Dulles Intl to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 5 days
Lisbon
Lisbon1 stop$649
Porto
Porto1 stop$660
Faro
Faro1 stop$714
Ponta Delgada
Ponta Delgada1 stop$749
Funchal
Funchal1 stop$804
Lajes
Lajes1 stop$843
Horta
Horta1 stop$1,548
Lisbon
Lisbon1 stop$649
Porto
Porto1 stop$660
Faro
Faro1 stop$714
Ponta Delgada
Ponta Delgada1 stop$749
Funchal
Funchal1 stop$804
Lajes
Lajes1 stop$843
Horta
Horta1 stop$1,548
Booking Insights

KAYAK's insights & trends for Dulles Intl to Portugal flights

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

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

The cheapest ticket to Portugal from Washington, D.C. Dulles Intl Airport found in the last 5 days was to Lisbon, at $536 round-trip. The most popular route is from Washington, D.C. Dulles Intl Airport (IAD) to Lisbon (LIS), and the cheapest round-trip airline ticket found on this route in the last 5 days was $536.

What is the cheapest time of day to fly to Portugal?

The cheapest time of day to fly to Portugal is generally in the evening, when round-trip flights cost $834 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to Portugal is generally at night, which is peak travel time and where the average cost of a ticket is $878.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Portugal?

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $703 on average.

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

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Portugal is January, when tickets cost $665 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $1,369 and $1,210 respectively.

What’s the cheapest day of the week to fly from Washington Dulles Airport to Portugal?

Your flight ticket price will generally be cheaper if you fly to Portugal on a Monday and more expensive on a Friday. On your return trip to Washington Dulles Airport, you should consider flying back on a Friday, and avoid Mondays for better deals.

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

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to Portugal, you should book around 4 weeks before departure, which saves you about 30% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Good to know

Low season

January

Cheapest flight

$269
Best time to beat the crowds with an average 34% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Washington Dulles Airport to Porto

FAQs - booking Portugal flights

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

    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 from Washington Dulles Airport to Portugal.

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

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

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

    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 from Washington Dulles Airport to Portugal 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 from Washington Dulles Airport to Portugal?

    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 from Washington Dulles Airport to Portugal 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 Portugal

  • Looking for a cheap flight? 25% of our users found tickets from Washington Dulles Airport to the following destinations at these prices or less: Lisbon $484 one-way - $648 round-trip

Reviews of the top 5 airlines serving from Dulles Intl to Portugal

 
Need help choosing which airline to fly with from Dulles Intl to Portugal? 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 10103 reviews
8.1Crew
7.1Entertainment
6.7Food
7.7Boarding
7.3Comfort
Airline reviews

A little more friendliness from that crew of the day.

8.0 ExcellentDaven, Aug 2026
Read more United Airlines reviews

A little more friendliness from that crew of the day.

Staff didn't seem confident about the ingredients in my lactose intolerance meal

the seat has a problem. the back had a hole.

My flight was delayed so bad i missed u it so i just said never mind

Delayed 2 hours while stuck on the aircraft. If the luggage was properly loaded the first time we probably wouldn’t have been delayed at all

1. Everything was satisfactory concerning the flight. 2. Can't think of what could be better right now.

Onboard staff was courteous, helpful, responsive and friendly. The boarding process was disorganized, poorly communicated, and disheveled. Gate agents were yelling instead of using the PA system, didn’t communicate the timing delay of our flight, and created an atmosphere of chaos rather than order and communication. As far as I know, there was no reason for their. I would hate to see how it operated under extreme conditions. I’ve never seen United Airlines operations in such a state.

The flight did not have its customary snacks during the flight. Apparently they were never loaded on the plane.

Worst service- attendants dont want to help and sat us in front of bathroom

We sat on the hot plane for ours with very conflicting messages. Some (most?) of this may be due to the flight control staff, but we were also repeatedly getting "we are leaving"/"we are not" messages. It was very uncomfortable

Awful customer service. What you are told 100% depends on who you talk to.

The embarkation at Dublin was a kin to a Ryanair approach, in other words a circuitous and cheep access

I love flying with them, the long-haul was fantastic. The short flight from Dublin --> Switzerland was horrible though. Most narrow seats I ever had, first and only time in my life I couldn't even close the seatbelt in seat 1A which was very embarrassing so I had to sit in the middle, because that seatbeld was 20cm longer. No idea why seat 1A would have a much shorter belt, it's just ridicilous. Also I hate the fixed seats, way too narrow.

Food was mediocre, but as expected in economy class on an airline. Wrap was ice cold , my son’s served by a steward on the next aisle was warm . As expected, but at least heat the food up a bit. No frills, but it’s economy. Excellent free WiFi was a bonus

Flight crew was superb. Meal was one of the meals at altitude I’ve had

Couldn’t check In online, message was couldn’t check in until Sunday morning though plane left Saturday night. Checked in okay at airport but caused slot if stress.

Excellent flight and crew. Boarding at Dublin Airport was a very difficult trying to find the right gate.

Delightful flight, ahead of time with a super crew, thanks

I had a great experience. I wasn’t sure what to expect but the crew helped me check my bags and made sure I got in the correct line to board. It was a bit of a walk to my gate so arrive early. I would recommend securing a flight that includes checking in your bag if you remotely think your baggage is over 10kg/22lbs. Be safe and upgrade unless you are carrying a backpack or weekend type baggage.

The only problem was there are games on the entertaiment system. The guy behind me played poker the entire time and poking the back of my seat. I hope they remove these.

Excellent experience - from boarding through the super smooth flight The food was mediocre and the app could be better but overall great experience

This was one of the worst flights I have ever taken in my entire life. First of all, I traveled Economy, but the seats were TINY and cramped. Not just for me; everyone around me was complaining of the same thing and said they could not get comfortable. Then there was the issue of the heat. For whatever reason the heat on the plane must have been turned to FULL BLAST, because even at 30,000 feet, it was SWEALTERING. Everyone was drench in sweat. Then, they were SO STINGY with the amount of drink they would give you. If you asked for water, it was in a tiny, paper cup (think bathroom cup) and they only filled it 3/4s of the way as if the cost came right out of the pockets of the air stewards. Everything was a money grab, you could tell! You had to pay for the WiFi, which was garbage slow, and the onboard entertainment was limited and stale. If I EVER fly TAP again, it will not be Economy class. What a disaster!

They blocked me from checking in online and they charged me lots of money

Poor. Our flight was delayed and they told me I would be fine to make my connection in Lisbon, I missed it. Then they told me my bag would be automatically loaded onto my new flight to rome. It wasn’t. It’s been 4 days and I still don’t have it.

The seats were not designed to comfortably see people in coach for more than 10 minutes

Checked bG chstgr was extremely high. Over $120. It was s bsit and switch knowing an international passenger would have t9 check a bag.

On time, politeness, food okay but entertneiment mediocre with only old movie and the so called new we’re 2 or 3…

Everything went very well. I would like to acknowledge the politeness and professionalism of the staff—they are superb. No complaints.

No legroom, have to pay for everything including water?!? Water is more expensive than beer?

We liked the crew. They were competent, professional and friendly. The only big negative was our departure was delayed several times and the airport staff did not communicate what the problems were and what we should expect.

Very efficient and excellent service. Nice amenities and beautiful plane. Elevated meals. Boarding could have been more organized. We missed our connecting flight due to EU entry but Lufthansa was extremely quick to rebook us.

Missed it by a couple minutes and couldn’t find an alternative flight so had to spend the night in DC and after much shuffling from 1 airline to another managed to get a United to Frankfurt.

There were only 2 toilets and one of them did not work in business class. We are not allowed to cross classes so had to wait in line to use the toilets!! The entertainment touch display was finicky and did not work all the time.

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Our flight was delayed for over an hour due to weather, and it had already been a long travel day. However, the crew was calm and compassionate, listening to every complaint with genuine concern. They got us home safely without incident, in spite of all of the obstacles. I’m grateful.

Bad! Disaster!! The LH419 was cancelled after 4 hrs on board with no AC and no toilets

We had almost a 6 hr delay, primarily due to weather, the e problem was that they communicated this delay and its length very poorly. The boarding was chaotic - even though they had hours to figure it out! The plane was an old 747 whose touch screens barely worked and there was a faulty USB port under my seat rest (something that wasn't labeled as being there) They organized my delayed luggage well. And I could get updates on the Lufthansa website. My shirt connecting flight charged for everything except water. Coffee was over 3€

It was freezing. I asked crew member for a blanket and was told it might be in front of plane but I never got one. I turned off all the vents but still froze.

We missed our connection and they put us in a hotel our luggage didn't get rerouted with us so we arrived with no luggage

The crew was friendly, 5/5 stars. The food was better than ok, 3.5/5 stars. The seats were tight, 3/5 stars. The entertainment was 2/5 stars because of lack of WiFi.

ldid not like the late departure did not like the late food service. Food should have been serve earlier ro allow more sleeping time. Did not like beeing interrupted just to show announcement about their duty free onboard Finally baggage did not make it to final destination and are still in casablanca.

My luggage was left behind in Miami. I wasn’t the only one. I couldn’t get a boarding pass from air Maroc but I got one from American Airlines for the air Maroc leg. I had the sense of getting in line with air Maroc boarding crew and showed them my AA boarding pass for air Maroc and I got a new one from them. There were several passengers filing missing bags reports in Casablanca so I assume there isn’t a good coordination between airlines. My AA bag ticket says Casablanca but it is from AA. I wasn’t the only one missing a bag.

I couldn’t find my boarding pass with the information provided by Underpricer. It took me several hours to find what the issue was. Finally I got the right code to get my boarding pass from American Airlines. Underpricer WhatsApp call center finally got it right. When I got to Casablanca my luggage was left in Miami. Not sure which airline fault it was if Air Maroc or AA. I filled out a report with Air Maroc

I would like to praise one of the stewards, Mohamed, who was swift and efficient to help me as I was not feeling well at some point during the flight.

Stay away at all cost! Late boarding, late departure, inoperable seat controls and entertainment screens, very rude cabin crew,

Flights were okay. Not bad, not good. On time and efficient. Planes are a bit old and run down, even the 787... Casablanca airport, HORRIBLE. no air conditioning, no power outlets, no clear signs to anywhere, old, unfriendly, no restaurants to speak of. Casablanca lounge, HORRIFIC No seats available most of the time, no power outlets working, no food, only water is offered, 1 shower available, unfriendly and inneficient people, no air conditioning, flies and bugs everywhere, extremely old seats and unconfortable. Although with some cleaning crew present, toilettes are .... not too clean.

3 hour delay, very rude flight attendant the food was horrible.

Plane is dirty Food quality poor Service was not good Lounge extremely bad

Everything you need to know for your flight from Dulles Intl to Portugal

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