OPO - WAS

$348 Find Cheap Flights from Porto to Washington, D.C. - Compare and Save

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 Washington, D.C. departing on 9/22. 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

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Everything you should know

Cheapest round-trip
$510
Iberia
Wed 9/16Tue 9/29
OPO - IAD • 1 stop
Cheapest one-way
$347
Typical prices: $414-$876
Iberia
Tue 9/22
OPO - IAD • 1 stop
Top airlines
Iberia
Cheapest • from $510 (round-trip)
TAP AIR PORTUGAL
Best reviews • 7.2 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Porto and Washington, D.C.. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Frankfurt am Main (FRA)
Cheapest • Avg $595 (round-trip)
Lisbon (LIS)
Shortest trip • 11h 08m (one-way)
Insights
Insights
Insights
Insights
When to travel
March
Cheapest • 26% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Washington, D.C.!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Porto to Washington, D.C. (OPO-WAS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to Washington, D.C. 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 Washington, D.C.

Wed, Sep 16 - Tue, Sep 29
Iberia Logo
8:20 am - 3:30 pm
OPO
-
IAD
12h 10m
1 stop
Iberia Logo
10:25 pm - 8:00 pm
IAD
-
OPO
16h 35m
2 stops
$510Iberia
Tue, Sep 8 - Tue, Sep 15
SWISS Logo
8:40 am - 4:45 pm
OPO
-
IAD
13h 05m
1 stop
SWISS Logo
8:20 pm - 5:35 pm
IAD
-
OPO
16h 15m
1 stop
$516SWISS
Wed, Sep 16 - Tue, Sep 29
Iberia Logo
10:00 pm - 3:55 pm
OPO
-
IAD
22h 55m
2 stops
Iberia Logo
10:25 pm - 8:00 pm
IAD
-
OPO
16h 35m
2 stops
$518Iberia
Fri, Sep 18 - Sun, Oct 4
Lufthansa Logo
6:00 am - 4:05 pm
OPO
-
IAD
15h 05m
1 stop
Lufthansa Logo
10:20 pm - 11:25 pm
IAD
-
OPO
20h 05m
1 stop
$521Lufthansa
Fri, Sep 18 - Mon, Sep 21
American Airlines Logo
8:20 am - 9:59 am
OPO
-
DCA
30h 39m
2 stops
American Airlines Logo
3:06 pm - 4:00 pm
DCA
-
OPO
19h 54m
2 stops
$526American Airlines
Mon, Dec 21 - Mon, Dec 28
Iberia Logo
8:20 am - 9:06 pm
OPO
-
DCA
17h 46m
2 stops
Iberia Logo
1:47 pm - 11:45 am
DCA
-
OPO
16h 58m
2 stops
$527Iberia
Mon, Dec 21 - Mon, Dec 28
Iberia Logo
8:20 am - 9:06 pm
OPO
-
DCA
17h 46m
2 stops
Iberia Logo
6:30 pm - 11:45 am
DCA
-
OPO
12h 15m
2 stops
$528Iberia
Fri, Sep 18 - Mon, Sep 21
American Airlines Logo
12:25 pm - 3:30 pm
OPO
-
IAD
32h 05m
1 stop
American Airlines Logo
5:00 pm - 4:00 pm
IAD
-
OPO
18h 00m
1 stop
$532American Airlines
Mon, Dec 21 - Mon, Dec 28
Multiple Airlines Logo
8:40 pm - 3:40 pm
OPO
-
IAD
24h 00m
2 stops
Multiple Airlines Logo
9:12 am - 11:45 am
IAD
-
OPO
21h 33m
2 stops
$533Multiple Airlines
Mon, Dec 21 - Mon, Dec 28
Multiple Airlines Logo
8:40 pm - 3:40 pm
OPO
-
IAD
24h 00m
2 stops
Multiple Airlines Logo
9:12 am - 11:45 am
IAD
-
OPO
21h 33m
2 stops
$535Multiple Airlines
Booking Insights

KAYAK's insights & trends for Porto to Washington, D.C. flights

Get data-powered insights and trends into flights from Porto to Washington, D.C. 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.?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Porto to Washington, D.C. departing in October.

Flight prices are below average for this route right now.

Flights to Washington, D.C. from Porto usually cost between $761 and $809 in October.
The lowest price found in the past 5 days was $510 on Multiple Airlines (Oct 6-Oct 15).

What is the cheapest month to fly from Porto to Washington, D.C.?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Porto to Washington, D.C., 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 from Porto to Washington, D.C. is March, where tickets cost $554 (return) on average. On the other hand, the most expensive months are January and September, where the average cost of round-trip tickets is $1,077 and $993 respectively.

Find deals

Good to know

Low season

February

Cheapest flight

$348
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Porto to Washington Dulles Airport

When to book flights from Porto to Washington, D.C.

Are your dates flexible? Find out the best times to travel from Porto to Washington, D.C. 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 flights from Porto to Washington, D.C.

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

    In the last 5 days, the lowest price for a flight from Porto to Washington, D.C. was $347 for a one-way ticket and $510 for a round-trip.

  • Do I need a passport to fly between Porto and Washington, D.C.?

    Yes

  • Which airports will I be using when flying from Porto to Washington, D.C.?

    On your way to Washington, D.C., you’ll fly out from Porto. You’ll be landing in one of Washington, D.C.’s 2 airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl.

  • Which aircraft models fly most regularly from Porto to Washington, D.C.?

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

  • How does KAYAK find such low prices on flights from Porto to Washington, D.C.?

    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, D.C..

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to Washington, D.C.?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington, D.C. 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, D.C.?

    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, D.C. with an airline and back to Porto with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to Washington, D.C.?

    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, D.C. 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 Washington, D.C.

 
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 Washington, D.C.? 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.
7.2
TAP AIR PORTUGALOverall score based on 2350 reviews
7.1Comfort
6.4Entertainment
7.0Boarding
6.3Food
7.8Crew
Airline reviews

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!

2.0 MediocreCharis, Apr 2026
OPO - LIS
Read more TAP AIR PORTUGAL reviews

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 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.

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 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.

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.

Flight delayed by >1 hour. Long boarding involving riding a shuttle to the plane.

TAP is a good, decent airline for international journeys. No complaints about the service, the crew, the comfort, or the baggage handling.

Packing people into a bus like sardines and then making them wait for at least 10-15 minutes before driving them to a location a mile away is not the way a national airline should represent itself. And it seems like everyone chosen for additional screening was a woman. What is up with that?

Everything you need to know for your flight from Porto to Washington, D.C.

Information on your arrival and departure airports

Porto (OPO)