OPO - IAD

$413 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 10/13. 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

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

Thu, Oct 2 - Wed, Oct 15
Iberia Logo
8:15 am - 3:00 pmOPO-IAD
11h 45m1 stop
Iberia Logo
4:35 pm - 3:55 pmIAD-OPO
18h 20m1 stop
$530Iberia
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Fri, Sep 26 - Sat, Oct 4
KLM Logo
9:20 am - 4:20 pmOPO-IAD
12h 00m1 stop
KLM Logo
9:20 pm - 3:30 pmIAD-OPO
13h 10m1 stop
$538KLM
Find Deal
Thu, Oct 2 - Wed, Oct 15
SWISS Logo
7:20 pm - 4:15 pmOPO-IAD
25h 55m1 stop
SWISS Logo
8:45 pm - 6:30 pmIAD-OPO
16h 45m1 stop
$540SWISS
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Fri, Oct 31 - Tue, Nov 11
SWISS Logo
12:50 pm - 5:40 pmOPO-IAD
32h 50m1 stop
SWISS Logo
5:25 pm - 11:15 amIAD-OPO
12h 50m1 stop
$541SWISS
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Sat, Nov 1 - Mon, Nov 10
Multiple Airlines Logo
4:10 pm - 5:05 pmOPO-IAD
28h 55m1 stop
Multiple Airlines Logo
6:50 pm - 10:30 amIAD-OPO
10h 40m1 stop
$542Multiple Airlines
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Fri, Sep 26 - Sat, Oct 4
Delta Logo
6:40 am - 3:35 pmOPO-IAD
13h 55m1 stop
Delta Logo
8:17 pm - 3:30 pmIAD-OPO
14h 13m2 stops
$544Delta
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Sat, Nov 1 - Tue, Nov 11
Delta Logo
6:00 am - 5:05 pmOPO-IAD
15h 05m1 stop
Delta Logo
11:05 am - 10:30 amIAD-OPO
18h 25m2 stops
$549Delta
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Thu, Oct 9 - Fri, Dec 26
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
Lufthansa Logo
10:55 pm - 11:40 pmIAD-OPO
19h 45m1 stop
$553Lufthansa
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Thu, Oct 30 - Mon, Nov 10
Multiple Airlines Logo
11:20 am - 11:00 pmOPO-IAD
15h 40m2 stops
Multiple Airlines Logo
6:50 pm - 10:30 amIAD-OPO
10h 40m1 stop
$561Multiple Airlines
Find Deal
Wed, Oct 8 - Fri, Dec 26
Lufthansa Logo
6:15 am - 7:25 pmOPO-IAD
18h 10m1 stop
Lufthansa Logo
10:55 pm - 11:40 pmIAD-OPO
19h 45m1 stop
$572Lufthansa
Find Deal

Everything you should know

Top airlines
Iberia
Cheapest • from $530 (round-trip)
TAP AIR PORTUGAL
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$530
Typical prices: $659-809
Iberia
Thu 10/2Wed 10/15
OPO - IAD • 1 stop
Cheapest one-way
$413
Typical prices: $602-743
Multiple Airlines
Mon 10/13
OPO - IAD • 3 stops
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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.

How much is a round-trip flight from Porto to Washington, D.C. Dulles Intl Airport?

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.

Find deals

Good to know

Low seasonApril
Cheapest flight$413
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly and prices are also 26% lower on average.
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 $413 for a one-way ticket and $530 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, oneworld, and SkyTeam are the airline alliances operating flights between Porto and Washington Dulles Airport, with Star Alliance being the most commonly used for this route.

  • 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 1975 reviews
6.3Entertainment
7.0Boarding
7.8Crew
7.1Comfort
6.2Food
Airline reviews

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

2.0 MediocreAnonymous, Aug 2025LIS - LGW
Read more TAP AIR PORTUGAL reviews

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!

Flight was fine. Second meal ( fish sandwich on hard roll) was awful. My suitcase didn’t make the flight. It had been located, but won’t be delivered until tomorrow. Five days after flight

Boarding experience was awful. TAP claims I did not have check in luggage with tickets. I went 3-4 check in agents until I finally found a helpful kind agent who checked in my luggage with no fees. On top of that our flight was over 2 hours delayed with barely an apology or explanation.

The airport temperature at the airport and on the flight was too warm

Flight being delayed for 35 minutes had me lose the connection to my transport

Was the best airplane ✈️ ever that I never see I will traveling again again with u guys.

Flight was delayed on 6/20 to miss international connection. Next flight out was 24 hours later. Not acceptable.

Flight from FNC to OBO was cancelled. We were rebooked to Lisbon later in the day. It was inconvenient but it worked out ok in the end.

Terrible flight attendant attitude. Average 3-star hotel employee has better hospitality skills. Business class seats are literally a joke. TAP executives should ride business class in other airlines to develop some rudimentary sense of what business class is.

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

Information on your arrival and departure airports

Porto (OPO)
Dulles Intl (IAD)

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