$297 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 3/4. 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
$440
Lufthansa
Thu 2/12Wed 2/25
OPO - IAD • 1 stop
Cheapest non-stop
$455
Typical prices: $595-$735
TAP AIR PORTUGAL
Tue 2/17Tue 3/10
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
When to travel
December
Cheapest • 21% price drop
August
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

Thu, Feb 12 - Wed, Feb 25
Lufthansa Logo
6:00 am - 2:35 pm
OPO
-
IAD
13h 35m
1 stop
Lufthansa Logo
10:00 pm - 3:25 pm
IAD
-
OPO
12h 25m
1 stop
$440Lufthansa
Thu, Feb 12 - Wed, Feb 25
Lufthansa Logo
6:00 am - 2:35 pm
OPO
-
IAD
13h 35m
1 stop
Lufthansa Logo
10:00 pm - 3:25 pm
IAD
-
OPO
12h 25m
1 stop
$441Lufthansa
Tue, Apr 21 - Wed, Apr 29
TAP AIR PORTUGAL Logo
9:00 am - 3:05 pm
OPO
-
IAD
11h 05m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 7:00 pm
IAD
-
OPO
15h 25m
1 stop
$445TAP AIR PORTUGAL
Tue, Apr 21 - Wed, Apr 29
TAP AIR PORTUGAL Logo
5:05 am - 3:05 pm
OPO
-
IAD
15h 00m
1 stop
TAP AIR PORTUGAL Logo
10:35 pm - 8:25 pm
IAD
-
OPO
16h 50m
1 stop
$446TAP AIR PORTUGAL
Thu, Feb 19 - Tue, Mar 10
Lufthansa Logo
5:00 am - 2:35 pm
LIS
-
IAD
14h 35m
1 stop
Lufthansa Logo
6:40 pm - 1:20 pm
IAD
-
LIS
14h 40m
1 stop
$447Lufthansa
Thu, Feb 12 - Mon, Feb 16
Multiple Airlines Logo
6:00 am - 3:50 pm
OPO
-
IAD
14h 50m
1 stop
Multiple Airlines Logo
5:45 pm - 11:15 am
IAD
-
OPO
12h 30m
1 stop
$449Multiple Airlines
Sun, Mar 1 - Sun, Mar 8
Lufthansa Logo
5:00 am - 3:50 pm
LIS
-
IAD
15h 50m
1 stop
Lufthansa Logo
7:00 pm - 11:35 am
IAD
-
LIS
12h 35m
1 stop
$452Lufthansa
Thu, Feb 12 - Wed, Feb 25
United Airlines Logo
6:00 am - 3:50 pm
OPO
-
IAD
14h 50m
1 stop
United Airlines Logo
5:34 pm - 9:30 am
IAD
-
OPO
10h 56m
1 stop
$458United Airlines
Thu, Apr 16 - Sun, Apr 19
United Airlines Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
United Airlines Logo
5:55 pm - 11:10 am
IAD
-
OPO
12h 15m
1 stop
$463United Airlines
Thu, Feb 12 - Wed, Feb 25
Multiple Airlines Logo
6:00 am - 3:49 pm
OPO
-
IAD
38h 49m
2 stops
Multiple Airlines Logo
5:45 pm - 11:15 am
IAD
-
OPO
12h 30m
1 stop
$464Multiple 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 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 $588 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 $1,016 and $927 respectively. For return trips, the best month to travel is December with an average price of $588.

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 $634 one-way - $679 round-trip.

Good to know

Low seasonMarch
Cheapest flight$297
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly and prices are also 11% 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 $808. The cheapest price found on KAYAK in the last 2 weeks cost $499 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 $658. On the other hand, the most expensive day to fly is Monday, where prices are $895 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 $807.

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 $1,033
  • 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 9213 reviews
7.7Boarding
7.3Comfort
7.1Entertainment
8.1Crew
6.6Food
Airline reviews

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

6.0 GoodMichael, Jan 2026
GVA - IAD
Read more United Airlines reviews

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

The seats were comfortable and we had leg room. Great entertainment.

The flight crew where really good. Better then the crew from BNE to SFO

Safe made to destination. Late to start at GVA for icy reasons but we fought our next fly.

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

l really enjoy very much the flight was very pleasant

The flight was delayed for 1:30 hours for maintenance issues. They should give more information about connecting flights. For a Business Cabin the Crew was mediocre.

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

this flight was awful from pre-boarding to on the plane. There needs to be more coordination between TAP and My Way. We were in first class and I am handicapped. BY the time we got on the plane there was no place for our baggage and the crew did not handle the situation well. They gave us an argument and said that we'd have to have it checked. Then, after I complained they moved some people's bags to put our small carry ons several seats back of our seats which were in Row 4.

Bad. They gave me a voucher for food to use at the airport but didn’t have time since I had to catch the other plane. No refunds and lack of communication

Negative. Food was awful, seat broken, flight was late, baggage lost and damaged

The ground staff did not load my bag onto the plane and despite me watching from the bus that my bag is not being loaded and taken back on the cart to the terminal, I pointed out to the staff and ge laughed upon checking my tag and knowing they made a mistake. Instead of calling the cart back and loading it he said we can’t fo anything and you should file a report upon landing at RAK. I told them my stay there is short and i needed my bag as it had everything I needed but no avail. Even the pilot was informed, staff of the plane was aware but all in don’t care mode. Upon arriving at Marrakech RAK, i filed a report and being told it might come in next flight tomorrow and we don’t provide delivery service, you must come and pick it up. If it doesn’t arrive on time then it will be sent to your home in the US. Unbelievable stress and inconvenience that could have been easily prevented by the ground staff.

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.

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.

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
Glen Burnie
Greenbelt
Ellicott City
Edgewood
Colonial Beach
Pikesville
Lutherville Timonium
Hunt Valley
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.