OPO - IAD

$339 Find Cheap Flights from Porto 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 from Porto to Dulles Intl departing on 12/18. 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 in flight searches from Porto 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 in flight searches from Porto to Washington, D.C., as well as popular online travel agencies
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Flight Deals

Cheap Flights from Porto to Dulles Intl (OPO-IAD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto 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 Porto to Dulles Intl

Fri, Nov 21 - Thu, Dec 4
Scandinavian Airlines Logo
5:35 pm - 6:50 pmOPO-IAD
30h 15m1 stop
Scandinavian Airlines Logo
8:30 pm - 4:55 pmIAD-OPO
15h 25m1 stop
$519Scandinavian Airlines
Find Deal
Thu, Dec 11 - Fri, Dec 26
TAP AIR PORTUGAL Logo
9:00 am - 3:15 pmOPO-IAD
11h 15m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 3:55 pmIAD-OPO
12h 25m1 stop
$565TAP AIR PORTUGAL
Find Deal
Sat, Nov 22 - Sun, Apr 5
KLM Logo
6:00 am - 4:05 pmOPO-IAD
15h 05m1 stop
KLM Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
$572KLM
Find Deal
Mon, Nov 24 - Mon, Dec 1
Delta Logo
6:30 am - 4:05 pmOPO-IAD
14h 35m1 stop
Delta Logo
6:50 pm - 10:30 amIAD-OPO
10h 40m1 stop
$573Delta
Find Deal
Fri, Nov 21 - Sat, Apr 4
Delta Logo
6:30 am - 7:08 pmOPO-IAD
17h 38m2 stops
Delta Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
$577Delta
Find Deal
Fri, Nov 21 - Sun, Apr 5
KLM Logo
6:30 am - 7:08 pmOPO-IAD
17h 38m2 stops
KLM Logo
6:30 pm - 3:30 pmIAD-OPO
16h 00m1 stop
$582KLM
Find Deal
Thu, Nov 20 - Thu, Apr 2
United Airlines Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
United Airlines Logo
5:20 pm - 9:45 amIAD-OPO
11h 25m1 stop
$584United Airlines
Find Deal
Sat, Nov 22 - Sun, Apr 5
Multiple Airlines Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
Multiple Airlines Logo
8:45 pm - 6:30 pmIAD-OPO
16h 45m1 stop
$587Multiple Airlines
Find Deal
Sun, Nov 23 - Sat, Apr 4
Multiple Airlines Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
Multiple Airlines Logo
8:45 pm - 6:30 pmIAD-OPO
16h 45m1 stop
$589Multiple Airlines
Find Deal
Thu, Nov 27 - Thu, Dec 4
United Airlines Logo
6:00 am - 11:49 amOPO-IAD
34h 49m2 stops
United Airlines Logo
12:50 pm - 11:40 amIAD-OPO
17h 50m2 stops
$594United Airlines
Find Deal

Everything you should know

Top airlines
Scandinavian Airlines
Cheapest • from $519 (round-trip)
TAP AIR PORTUGAL
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$519
Scandinavian Airlines
Fri 11/21Thu 12/4
OPO - IAD • 1 stop
Cheapest one-way
$339
Typical prices: $461-$582
Iberia
Thu 12/18
OPO - IAD • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Dulles Intl!
Booking Insights

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

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

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

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

When flying from Porto to Washington Dulles Airport, you should consider leaving on a Monday and avoid Wednesdays if you are looking for the best rates. For your return to Porto, you’ll find the best rates on Sundays and the most expensive ones on Fridays.

Good to know

Cheapest flight$339
Flight from Porto to Washington Dulles Airport

When to book flights from Porto to Dulles Intl

Are your dates flexible? Find out the best times to travel from Porto to Dulles Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Porto to Washington Dulles Airport flights

  • What is the cheapest flight from Porto to Washington, D.C. Dulles Intl Airport?

    In the last 3 days, the lowest price for a flight from Porto to Washington, D.C. Dulles Intl Airport was $339 for a one-way ticket and $519 for a round-trip.

  • Do I need a passport to fly between Porto and Washington Dulles Airport?

    Yes

  • Which airports will I be using when flying from Porto to Washington Dulles Airport?

    On your way to Washington Dulles Airport, you’ll fly out from Porto. You’ll be landing at Washington, D.C. Dulles Intl.

  • Which aircraft models fly most regularly from Porto to Washington Dulles Airport?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Porto to Washington Dulles Airport?

    Star Alliance is the only airline alliance operating flights between Porto and Washington Dulles Airport.

  • How does KAYAK find such low prices on flights from Porto 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 from Porto to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto 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 from Porto 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 Porto 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 to Porto with another airline. Booking your flights between Porto and IAD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto 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 from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Porto to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Porto to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Porto 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.
7.1
TAP AIR PORTUGALOverall score based on 2037 reviews
7.0Boarding
6.2Food
7.8Crew
6.3Entertainment
7.1Comfort
Airline reviews

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.

2.0 MediocreAnonymous, Oct 2025LIS - LHR
Read more TAP AIR PORTUGAL reviews

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.

Did not enjoy the meal provided. The aircraft was dirty. For instance, the screen seemed to have been cleaned with a dirty rag. Disgusting.

The person at the checkin was very helpful. We couldn’t check in through the keyosk, but the agent was very helpful.

Great price for really nice seats and the plane and staff were great, only 5-10 minute delays!

Tap was very frustrating in Lisbon. Not enough direction and help. Mixed messages of where we needed to go. Seats were not very comfortable.

Everything went as expected. Luggage arrived at my same destination and nothing disturbed my vacation.

This flight arrived late. We joined well over a thousand of other people waiting to go through customs. Air Portugal has lost my bag. We had to chase down a representative even though we had waited at the baggage claim for well over 1 hour and 35 minutes for baggage to come. No representative was there to explain the delay or to give any direction. After 1 hour and 35 minutes at least four passengers had no baggage to pick up or had a fraction of their baggage. The representative was a young woman who clearly did not have the experience to deal with what was happening. Very disappointing as of course we were dealing with great amount of jet lag and having been up for 24 hours at that point and not being able to have any of the things necessary at home that were contained in the bag was quite upsetting. That instant occurred last night at approximately 11:15 p.m. and as of 12:30 p.m. the next day I have not heard anything from Air Portugal.

Check-in guidance for transfer flight, boarding, in-flight service, seat comfort, etc.

Very rude person at the boarding desk; flight attendant coughing 3 inches from my face three times- not even covering her mouth; boarding process very unacceptable for older people with stairs to all planes (are you all stuck in the 1960’s?). I am sure that I am not remembering all of the negative things, but I am sure you get the message!

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

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