$381 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 6/12. 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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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

Mon, Jun 1 - Mon, Jun 8
Lufthansa Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
Lufthansa Logo
3:25 pm - 3:40 pm
IAD
-
OPO
19h 15m
1 stop
$616Lufthansa
Sat, May 16 - Sun, May 24
Lufthansa Logo
7:25 am - 4:05 pm
LIS
-
IAD
13h 40m
1 stop
Lufthansa Logo
10:25 pm - 10:30 am
IAD
-
LIS
7h 05mnonstop
$652Lufthansa
Thu, May 14 - Sun, Jun 7
Multiple Airlines Logo
6:00 am - 3:05 pm
OPO
-
IAD
14h 05m
1 stop
Multiple Airlines Logo
5:35 pm - 4:00 pm
IAD
-
OPO
17h 25m
1 stop
$670Multiple Airlines
Fri, Aug 28 - Sun, Sep 13
Lufthansa Logo
5:05 am - 1:35 pm
LIS
-
IAD
13h 30m
1 stop
Lufthansa Logo
10:20 pm - 10:45 pm
IAD
-
LIS
19h 25m
1 stop
$671Lufthansa
Thu, May 14 - Fri, May 29
Lufthansa Logo
6:00 am - 3:05 pm
OPO
-
IAD
14h 05m
1 stop
Lufthansa Logo
3:25 pm - 11:15 am
IAD
-
OPO
14h 50m
1 stop
$671Lufthansa
Tue, Oct 13 - Sun, Oct 18
Lufthansa Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
Lufthansa Logo
3:25 pm - 11:15 am
IAD
-
OPO
14h 50m
1 stop
$673Lufthansa
Thu, May 14 - Fri, May 29
SWISS Logo
12:15 pm - 4:45 pm
OPO
-
IAD
33h 30m
1 stop
SWISS Logo
8:20 pm - 6:30 pm
IAD
-
OPO
17h 10m
1 stop
$674SWISS
Thu, May 14 - Fri, May 29
SWISS Logo
7:20 pm - 4:45 pm
OPO
-
IAD
26h 25m
1 stop
SWISS Logo
8:20 pm - 6:30 pm
IAD
-
OPO
17h 10m
1 stop
$675SWISS
Thu, May 14 - Fri, May 29
SWISS Logo
7:20 pm - 3:15 pm
OPO
-
IAD
24h 55m
1 stop
SWISS Logo
8:20 pm - 6:30 pm
IAD
-
OPO
17h 10m
1 stop
$678SWISS
Sat, May 16 - Sun, May 24
Multiple Airlines Logo
5:05 am - 4:05 pm
LIS
-
IAD
16h 00m
1 stop
Multiple Airlines Logo
8:20 pm - 11:25 pm
IAD
-
LIS
22h 05m
1 stop
$693Multiple 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 cheapest flight deal to Washington Dulles Airport was found on the route from Porto, at $616 return. The most popular connection is from Los Angeles to Washington Dulles Airport and KAYAK users have found round-trip deals for as low as $268 in the last 3 days.

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

The average price of all round-trip flights to Washington, D.C. Dulles Intl Airport clicked on KAYAK for each day over the last 12 months.

Based on KAYAK data, the cheapest day to fly to Washington, D.C. is Wednesday where round-trip tickets can be as cheap as $798. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $1,070 on average.

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 January, where tickets cost $544 on average for return flights. On the other hand, the most expensive months are July and June, where the average cost of tickets from Portugal is $1,014 and $933 respectively. For one-way flights, the best month to travel is January with an average price of $544.

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

The average price for all round-trip flights to Washington, D.C. Dulles Intl Airport depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Washington, D.C. Dulles Intl Airport is generally in the evening, when round-trip flights cost $672 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 $925.

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 $982 round-trip.

Good to know

Low seasonJanuary
Cheapest flight$381
Best time to beat the crowds but there is an average 10% increase in price.
Most popular time to fly and prices are also 11% 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 cheapest flight deal to Washington Dulles Airport was found on the route from Porto, at $616 return. The most popular connection is from Los Angeles to Washington Dulles Airport and KAYAK users have found round-trip deals for as low as $268 in the last 3 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 $946. The cheapest price found on KAYAK in the last 2 weeks cost $396 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 $1,216
  • 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 9682 reviews
6.6Food
7.7Boarding
7.3Comfort
8.1Crew
7.1Entertainment
Airline reviews

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

8.0 ExcellentAnonymous, Apr 2026
DEN - IAD
Read more United Airlines reviews

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Terrific in every way. On time, professional staff, multiple movie options to select, great food and drink.

My bags were misplaced!!! Im in a foreign country with no bags

I liked that it was on time, however, the food was not good.

Offered to check carry on to final destination. This is the most absurd thing in the world. I'm carrying on because I need what is in the carry-on. I'm okay with picking up at next stop but then I will be on much larger plane that can accommodate it. Also, if there is ever a change to your flight. Go to the airport and have the people there fix your ticket. Don't do it over the phone or online with United they screwed us up and ended up with flights for our last leg that took off before our first leg.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

When I went to check in at the United counter in Barcelona, Spain I had 2 different menat 2 different times in United uniforms (standing around with a couple other employees) ask me if I was traveling alone. The one man asked me 3 different ways if I was traveling alone. I am, 68 yeaers old and have all my faculties. I thought it was weird and it made me feel very uncomfortable. What difference does it make if I was traveling alone or with someone? What if I was a recent widow? That would have been horrible. They never gave me a reason why they needed to know who I was traveling with. I was hesitant to question them because I needed to be on that flight.

Crew was great. 2 1/2 hour delay was due to staff needing "rest" was avoidable and self inflicted as United not willing to hire enough crew to keep flight on time.. Ridiculous. The crew and the passengers both suffered due to this.

Fine not above and beyond as I had a connection that was delayed due to maintenance

Didn't make announcements during boarding, flight attendant seemed annoyed when I asked for water. Too many hours between flights. Confusing check in at the Lisbon airport.

Chaotic boarding with no announcements. Carry on luggage needs to be checked. Bare minimum zero frill flights. Not a whole lot of anything positive to be said .

It poured rain, our luggage was sitting out in it uncovered on the transport cart while our plane was delayed! Nice business class plane for short flight to Lisbon, but more delay & rain in Lisbon, with terrible Business class seat with no entertainment & cold food on longer flight to London…ALL LUGGAGE AND CLOTHES INSIDE THEM WERE SOAKED THROUGH!!! Could only try with hair dryer to get some drying before quick turn round to train trip.

Delayed at the beginning and the end and almost missed our connection

Menzies group staff not very sympathetic good at breaking up families during the boarding process

They left our luggage uncovered on tarmac in pouring rain during an hour delay of departure! At our final destination, we found ALL OF OUR CLOTHES/SHOES soaked all the way through!! Our 1st connection plane was a great business class accommodation but only 50 minutes long. Our 2nd connection from Lisbon (another delay with luggage uncovered on tarmac) had only the extra legroom and mediocre food in business class - no entertainment and no extra comfort seating. Will not use TAP Air Portugal again!

The crew was great. There was a big guy sitting next to me who was hanging over my side of the armrest the entire time. Maybe some information about "Be considerate of your neighbors, this is tight space, be kind". The breakfast sandwich was not appealing at all.

Kayak let me choose these flights on TAP but then after 2 months, cancelled my flights because they didn't think 90 minutes was enough time for the connection. I notice that neither flight was actually cancelled. Just my reservation. Why let me go through all of that effort to find the right flights for us, only to cancel it from underneath us 2 months later leaving us scrambling to find an alternative?

It was a good experience overall. We were however delayed by over 3 hours due to a security issue with one of the passengers inadvertently leaving a power bank in a luggage she was using as carrying on but then had to be moved int check in due to spacing issues. The airline staff had requested that she checked her bags in, but should have reminded her about removing all hazardous material like her power bank. When she eventually remembered as we were on the plane, we had to turn back and go through security all over again. Hence delaying our takeoff. The incident could have been prevented if staff reminded these passengers to remove their power banks.

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.

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
Oxon Hill
Martinsburg
Owings Mills
Charles Town
Greenbelt
Glen Burnie
Edgewood
Ellicott City
Colonial Beach
Pikesville
Camp Springs
Hunt Valley
Lutherville Timonium
Westminster

Everything you need to know for your flight to Dulles Intl

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