$358 Find Cheap Flights from Portugal to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Dulles Intl departing on 3/24. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C. Dulles Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Washington, D.C., as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Washington, D.C., as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$506
TAP AIR PORTUGAL
Fri 1/30Fri 2/6
OPO - IAD • 1 stop
Cheapest non-stop
$551
Typical prices: $643-$837
TAP AIR PORTUGAL
Tue 2/24Sun 3/22
LIS - IAD • Non-stop
Top airlines
TAP AIR PORTUGAL
Most flights • 7 per week
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Top routes
OPO-IAD
Cheapest
LIS-IAD
Most popular
Insights
Insights
Insights
Insights
When to travel
December
Cheapest • 18% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Dulles Intl!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Portugal to Dulles Intl

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portugal to Dulles Intl that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Portugal to Dulles Intl

Fri, Jan 30 - Fri, Feb 6
TAP AIR PORTUGAL Logo
2:20 pm - 9:00 pm
OPO
-
IAD
11h 40m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pm
IAD
-
OPO
13h 30m1 stop
$506TAP AIR PORTUGAL
Thu, Jan 15 - Wed, Jan 28
TAP AIR PORTUGAL Logo
7:00 am - 3:15 pm
OPO
-
IAD
13h 15m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 5:00 pm
IAD
-
OPO
13h 30m1 stop
$508TAP AIR PORTUGAL
Sun, Apr 12 - Sun, Apr 19
Royal Air Maroc Logo
6:40 pm - 7:00 pm
LIS
-
IAD
29h 20m1 stop
Royal Air Maroc Logo
9:00 pm - 11:50 am
IAD
-
LIS
9h 50m1 stop
$512Royal Air Maroc
Tue, Jan 13 - Tue, Jan 20
Multiple Airlines Logo
8:55 pm - 6:30 pm
LIS
-
IAD
26h 35m2 stops
Multiple Airlines Logo
7:40 pm - 7:50 pm
IAD
-
LIS
19h 10m2 stops
$525Multiple Airlines
Tue, Feb 24 - Sun, Mar 22
Royal Air Maroc Logo
5:55 pm - 6:45 pm
LIS
-
IAD
29h 50m1 stop
Royal Air Maroc Logo
9:45 pm - 4:55 pm
IAD
-
LIS
15h 10m1 stop
$537Royal Air Maroc
Thu, Jan 15 - Wed, Jan 21
TAP AIR PORTUGAL Logo
11:25 am - 3:15 pm
LIS
-
IAD
8h 50mnonstop
TAP AIR PORTUGAL Logo
10:30 pm - 10:35 am
IAD
-
LIS
7h 05mnonstop
$542TAP AIR PORTUGAL
Thu, Jan 15 - Wed, Jan 21
Lufthansa Logo
5:00 am - 3:50 pm
LIS
-
IAD
15h 50m1 stop
Lufthansa Logo
5:40 pm - 1:20 pm
IAD
-
LIS
14h 40m1 stop
$576Lufthansa
Thu, Jan 15 - Wed, Jan 28
Multiple Airlines Logo
6:00 am - 3:46 pm
OPO
-
IAD
38h 46m2 stops
Multiple Airlines Logo
9:45 am - 11:15 am
IAD
-
OPO
20h 30m2 stops
$596Multiple Airlines
Tue, Feb 24 - Sun, Mar 22
United Airlines Logo
5:00 am - 8:15 pm
LIS
-
IAD
20h 15m1 stop
United Airlines Logo
11:05 pm - 10:15 am
IAD
-
LIS
7h 10mnonstop
$597United Airlines
Thu, Jan 15 - Wed, Jan 21
United Airlines Logo
5:00 am - 8:15 pm
LIS
-
IAD
20h 15m1 stop
United Airlines Logo
5:38 pm - 8:10 am
IAD
-
LIS
9h 32m1 stop
$598United 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?

These are the best round-trip prices found by users searching on KAYAK in the last 72 hours.

In the last 3 days, the lowest price for a flight to Washington Dulles Airport was $358 for a one-way ticket from Porto and $506 for a round-trip. The most popular route searched for by our users was for flights from Lisbon to Washington Dulles Airport and the best round-trip deal found in the last 3 days was $512.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights to Washington, D.C. Dulles Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights to Washington, D.C. Dulles Intl Airport is December, where tickets cost $613 on average for one-way flights. On the other hand, the most expensive months are July and October, where the average cost of tickets from Portugal is $998 and $927 respectively. For return trips, the best month to travel is December with an average price of $613.

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 $602 one-way - $598 round-trip.

Good to know

Low seasonFebruary
Cheapest flight$358
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 18% lower on average.
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 3 days, the lowest price for a flight to Washington Dulles Airport was $358 for a one-way ticket from Porto and $506 for a round-trip. The most popular route searched for by our users was for flights from Lisbon to Washington Dulles Airport and the best round-trip deal found in the last 3 days was $512.

  • 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 $852. The cheapest price found on KAYAK in the last 2 weeks cost $497 and departed from Lisbon Humberto Delgado Airport.

  • 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 Sunday where tickets can be as cheap as $705. On the other hand, the most expensive day to fly is Monday, where prices are $872 on average.

  • 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.

  • 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 afternoon, when flights cost $484 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 $803.

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 $600
  • 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

 
See real verified KAYAK customer reviews for airlines flying to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Portugal to Washington, D.C.. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
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 9092 reviews
7.3Comfort
7.7Boarding
6.6Food
8.1Crew
7.1Entertainment
Airline reviews

The food is terrible. The same pasta or chicken with bad taste and presentation

6.0 GoodClaudia, Dec 2025
GUA - IAD
Read more United Airlines reviews

The food is terrible. The same pasta or chicken with bad taste and presentation

It was probably one of the worst flights I’ve been on. The restrooms were never cleaned or stocked. The food was very subpar, and i usually enjoy airline food, so I was disappointed. It was just all around a bad experience. The only saving grace was the flight attendants.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Great crew, excellent landing, good food. Over all great experience. Thank you!

One bag is incorrect and not acceptable for an international flight. The food was not just good. I won't fly with them again.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Crew was dismissive. Snacks and refills not offered. Poor business class experience. Bed not comfortable compared to Emirates or BA.

Flight was delayed for 5 hours because crew didn’t have enough time to rest - this seems like it could have been avoided with better scheduling. Food was not good.

IAD with the archaic people movers is just a place to be avoided.

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

Flew Business class and did not like anything, flight attendants were rude and not helpful. Food was of poor quality and I did not eat meals.

Wonderful just hope the had more direct flights to Boston

Boarding process was fast and efficient. Short flight but on time and well organized. I would certainly fly TAP again.

Very long line at the gate, moved slowly. I had expected that boarding a flagship A330neo would be with a jetway directly at the gate, and not a long bus ride to the airplane.

The layover was only one hour and a huge line for passport control. If I didn’t cut the line and argue was every single official, I would’ve spent the night in this one. Obviously.TAP AIR people. do not take into account.this problem with their flight scheduling, which is extremely frustrating. Poor food choices, on the pasta was offered, they ran out of chicken right away. All the sodas and water poured in a tiny 70 mL cups, which is not enough to keep hydrated on the long flight. I had to ask for 34 cups at a time. Flight attendant seemed to be tired and overworked.

Very borderline, low budget airline without low budget prices There are no counts of soda, everything is dispensed enlarged bottles and poured into tiny cups about 70 mL so in order to keep hydrated you have to take 3-4 cups at a time. Also, there was only one food item offered, pasta, they ran out of chicken right away. Snack was very poor. It was called tuna sandwich, which is truly borderline. The flight attend attendance seemed to be overworked and tired.

I am not very tall, and had a difficult time getting my carry-on placed in the overhead bin while passengers were behind me waiting to get to their seats. After struggling with the luggage, I turned it around, and left it, knowing it was not properly placed, but believing there was adequate room for it in the bin. When the flight attendant came through the cabin, she asked whose bag it was, and scolded me for not positioning it correctly. She turned it around and moved on. I thought that her approach was totally unprofessional, calling out a passenger in that manner.

TAP‘s flight attendants seem to be among the least ambitious of all the international flight crews we’ve flown with. . When we left US and went to Portugal, and when we returned from Portugal, flight attendants were not very visible. Then did not offer frequent water breaks and when we had to go back to request water, I was almost an imposition. Meal quality was just average. The dinners were fine. Breakfast wraps were presented soggy.

There was no warning that they have added passport control after check in, the line was enormous and after 46 mins wait we missed our flight. Were forced to leave the airport and purchase new tickets at full price to board a later flight. TAP were unsympathetic and unhelpful.

Boarding we were jammed into a hot crowded bus waiting too long while another bus went in front of us. Appreciated blanket and pillow, movie available helped time pass, the food was not appealing so I had my own snacks, the flight is long, but nothing they can do about that. Staff adequate, flight good.

Traveling to a place near Dulles Intl?

Book flights to Dulles Intl if you plan to visit one of these locations
Winchester
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Hanover
Springfield
Gaithersburg
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Charles Town
Glen Burnie
Ellicott City
Greenbelt
Edgewood
Colonial Beach
Pikesville
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Camp Springs
Stevensville

Everything you need to know for your flight to Dulles Intl

Information on the airport you'll fly into in Washington, D.C.