WAS - OPO

$289 Find Cheap Flights from Washington, D.C. to Porto

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Porto departing on 4/13. 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, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Porto.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Porto.
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Everything you should know

Cheapest round-trip
$558
Overall average: $672
TAP AIR PORTUGAL
Sun 4/26Fri 5/8
IAD - OPO • 1 stop
Cheapest one-way
$289
Multiple Airlines
Mon 4/13
BWI - OPO • 3 stops
Top airlines
Cheapest • from $578 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Washington, D.C. and Porto. You'll need at least 1 connection.
Insights
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Insights
Top layover airports
Cheapest • Avg $318 (round-trip)
Shortest trip • 9h 20m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 36% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
+1
+1
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Booking Insights
Flight Deals

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

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

Sun, Apr 26 - Fri, May 8
TAP AIR PORTUGAL Logo
10:35 pm - 12:40 am
IAD
-
OPO
21h 05m
1 stop
TAP AIR PORTUGAL Logo
12:00 pm - 8:35 pm
OPO
-
IAD
13h 35m
1 stop
$558TAP AIR PORTUGAL
Wed, Aug 19 - Tue, Aug 25
TAP AIR PORTUGAL Logo
5:45 pm - 9:00 am
IAD
-
OPO
10h 15m
1 stop
TAP AIR PORTUGAL Logo
10:00 am - 8:35 pm
OPO
-
IAD
15h 35m
1 stop
$573TAP AIR PORTUGAL
Thu, Apr 9 - Wed, Apr 15
TAP AIR PORTUGAL Logo
10:35 pm - 12:40 am
IAD
-
OPO
21h 05m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 3:10 pm
OPO
-
IAD
26h 10m
1 stop
$578TAP AIR PORTUGAL
Tue, Apr 14 - Fri, Apr 24
Turkish Airlines Logo
9:45 pm - 3:40 pm
IAD
-
OPO
36h 55m
1 stop
Turkish Airlines Logo
10:40 am - 7:50 pm
OPO
-
IAD
38h 10m
1 stop
$579Turkish Airlines
Mon, Aug 3 - Wed, Aug 19
United Airlines Logo
6:00 am - 7:00 am
DCA
-
OPO
20h 00m
1 stop
United Airlines Logo
2:25 pm - 1:59 pm
OPO
-
DCA
28h 34m
2 stops
$689United Airlines
Tue, Aug 18 - Wed, Aug 26
United Airlines Logo
11:00 am - 7:00 am
DCA
-
OPO
15h 00m
2 stops
United Airlines Logo
2:25 pm - 10:23 am
OPO
-
DCA
24h 58m
2 stops
$694United Airlines
Tue, Apr 7 - Wed, Apr 15
Delta Logo
3:35 pm - 3:25 pm
BWI
-
OPO
18h 50m
2 stops
Delta Logo
5:00 am - 4:49 pm
OPO
-
BWI
16h 49m
2 stops
$707Delta
Tue, Apr 7 - Wed, Apr 15
Delta Logo
5:06 pm - 3:25 pm
DCA
-
OPO
17h 19m
2 stops
Delta Logo
5:00 am - 6:59 pm
OPO
-
DCA
18h 59m
2 stops
$707Delta
Sun, Apr 26 - Thu, May 7
American Airlines Logo
1:29 pm - 7:40 am
DCA
-
OPO
13h 11m
2 stops
American Airlines Logo
8:20 am - 6:58 pm
OPO
-
DCA
15h 38m
2 stops
$714American Airlines
Mon, May 11 - Tue, May 19
Iberia Logo
1:25 pm - 7:40 am
DCA
-
OPO
13h 15m
2 stops
Iberia Logo
8:20 am - 6:58 pm
OPO
-
DCA
15h 38m
2 stops
$724Iberia
Booking Insights

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

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

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. to Porto, 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 Washington, D.C. to Porto is January, where tickets cost $539 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $868 and $836 respectively.

How far in advance should I book a flight from Washington, D.C. to Porto?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. to Porto, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Washington, D.C. to Porto, you should book around 3 weeks before departure, which saves you about 36% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$289
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly with an average 10% increase in price.
Flight from Baltimore to Porto

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

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

  • Which other nearby cities are served by Porto Airport (OPO)?

    Porto Airport (OPO) is the main international airport serving the city of Porto. You can explore several nearby cities within an hour's drive from OPO. The nearby cities are Braga, Guimaraes, and Aveiro. You can get to these cities using either buses, taxis, or car rentals from the airport (OPO). Car rentals, however, provide a more flexible means of transport from the airport to these cities.

  • Which airlines offer family services on trips between Washington and Porto?

    United Airlines, TAP Air Portugal, American Airlines, and Delta Airlines are family-friendly due to their spacious seating options, including extra legroom and seating arrangements designed for families. Furthermore, they feature kid-friendly menus, including meals and snacks, and in-flight entertainment to keep the kids engaged until their arrival in Porto.

  • Which eco-friendly practices do airlines use when flying from Washington and Porto?

    The average carbon emission per passenger on the Washington to Porto route is approximately 6865 lb. However, you can fly sustainably with TAP Air Portugal. The airline operates flights that produce 43% less carbon dioxide per passenger on this route. TAP Air Portugal is committed to blending SAFs into their jet fuel supply, which helps to significantly reduce greenhouse gas emissions associated with their flights. They have also implemented recycling programs on board their flights, encouraging passengers to separate and dispose of recyclable waste appropriately.

  • Can I rent a car at Porto Airport (OPO)?

    Yes, you can rent a car at OPO. OPO has a variety of car rental providers onsite, including Avis, Budget, Europcar, Hertz, Sixt, and Thrifty. Upon arrival at the airport, you will find the car rental providers' desks conveniently located in the arrivals area. These providers offer a wide selection of vehicles, including economy cars, sedans, and SUVs.

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Porto was $289 for a one-way ticket and $578 for a round-trip.

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

    Yes

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

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

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

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

  • Which airline alliances offer flights from Washington, D.C. to Porto?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Washington, D.C. and Porto, with oneworld being the most commonly used for this route.

  • What is the most popular layover when flying to Porto from Washington, D.C.?

    Lisbon is the most popular layover city among KAYAK users traveling from Washington, D.C. to Porto.

  • Which is the best airline for flights from Washington, D.C. to Porto, Delta or KLM?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Porto are Delta and KLM. With an average price for the route of $885 and an overall rating of 7.9, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $831 and an overall rating of 7.8.

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

    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 Washington, D.C. to Porto.

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

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

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

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

    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 Porto from Washington, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. to Porto

  • Dulles International Airport (IAD) is the hub for United Airlines, and if you are traveling with this airline from Washington, D.C., to Porto, you will depart from Terminal D. United Airlines operates most international flights from Terminal D while operating domestic flights from Terminal C.
  • Parents of Unaccompanied Minors flying from Washington (DCA) to Porto should consider booking them on American Airlines. Unaccompanied Minors between the ages of 5 and 14 years old are accepted by American Airlines at DCA. The minors receive a wristband at check-in with their flight information, and a customer service representative monitors them while accompanying them to the gate.
  • If you intend to take the Metro subway to the airport, you can get to either Reagan-National (DCA), which is connected to the Metro's Blue and Yellow Lines, or Dulles International (IAD), which is connected to the Metro's Silver Line.
  • If you’d like to upgrade your TAP Air Portugal Economy seat when flying from Washington to Porto, consider upgrading your Economy ticket to either EconomyXtra or Executive Cabin for a fee. EconomyXtra and Executive cabins provide passengers with additional legroom, wider seats, an additional baggage allowance, and enhanced in-flight services.
  • When departing from IAD, at least one VIP lounge is in each concourse. Concourse A has Air France-KLM, Etihad, and Virgin Atlantic lounges. Concourse B houses the British Airways lounge, the Lufthansa lounge, and Turkish Airlines amenities. In Concourse C, there are three United Club lounges, one United Polaris lounge, and one United Club lounge in Concourse D.

Reviews of the top 5 airlines serving from Washington, D.C. to Porto

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Porto. 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 Washington, D.C. to Porto? 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.
7.9
DeltaOverall score based on 8292 reviews
8.1Boarding
8.5Crew
7.8Entertainment
7.9Comfort
7.2Food
Airline reviews

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

2.0 MediocreSusan, Mar 2026
JAX - ATL
Read more Delta reviews

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

The WiFi was not working. That made for a long flight.

With Aeromexico it ended up good but with Delta it was bad because we did everything through Delta... Showed up at the Delta terminal... It was the wrong place! Nothing ever told us to go to the Aeromexico terminal. It said "in partnership with Aeromexico" but I was never instructed to check in with them or go to their terminal. We had to haul @$$ running through the airport and almost didn't make it thanks to this poor communication. 👎🏽

Absolutely no communication on why there's a delay and multiple flight time reschedules. I would have canceled the flight and drove back home if I known it was going to be rescheduled 3 or 4 times.

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Wonderful. Quick boarding. Early departure and we arrived 30 minutes early at our destination. Unfortunately, when you arrive early, there is still a departing aircraft at our gate. We had to park for 30 minutes until the gate was clear. So our early arrival was not really early at the gate. Otherwise it was a quick and smooth flight. Appreciated the efficiency.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Ineffective communication with United resulted in lost baggage. Their Baggage Tracing counter at MUC was shut down from 11:00-14:15 on my arrival. Undertrained, underinformed staff had me Running all over MUC to find someone to help me to no avail. Staff was rude, unhelpful, and unable to effectively use the systems they did have operational. They refused to contact United in any way or provide any accommodation or other resources while I waited for my luggage. This has destroyed my downstream itinerary. If they had even the slightest visibility I may have been able to reschedule/plan, but again, their staff provided nothing, and did nothing more than their website, which doesn’t even work on a standard phone browser. Miserable failure at all levels that weren’t associated with the operation of the aircraft.

Sat next to a one year old. She crawled all over the place and made me laugh.

The Crew and the food was the worst I ever had in Business Class. First they told us there were no space for carry on. It was plenty of space over our 2 row seats, we had to ask to let us travel with it which was accepted. They were aware that we had to run for the connection due to the previous flight delay. Have us one hour waiting for more customers and not even offer a glass of water. Then started the service and they started to serve other passengers drinks in business and did not offer any drinks until they serve our pre ordered meal and I ask for something to drink. I had to wait until they finished to serve all passengers until Inget something. The crew was the worts I ever had for Business Class in my life.

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

No difference between business class and normal same seat everything same, waste of money

They allowed me to book the flight, which took quite an effort to find the best option for us, and then 2 months later, cancelled it because they didn't think 90 minutes was enough time to get between connections. Why let me book the flight in the first place? I am somewhat disappointed in Kayak and will be choosing other options in the future

Absolutely unacceptable level of service for a Business class: lousy drink and food options, disgusting food (inedible meat, watery rice, etc...), pathetic level of attentiveness from staff, Business class restrooms were not accessible for long periods because blocked of by staff...overall extremely disappointing, will NEVER fly Business on TAP again.

Should really consider a better, smother boarding. Stood in tunnel for 20 plus minutes. Should start from back passengers of plane. Not front.

The plane was small and one felt the turbulence much more. The lines to get through immigration were insanely long.

First time flying Business with Tap, I think it was a very good experience. It beats many domestic US carriers, the food options were really great, authentic Portuguese food, wines & deserts. Next time will do the free 24-48 hour stopover in Lisbon or Porto for sure.

We upgraded to business class. Nice seat with lots of room but otherwise not impressive.

Delayed departure Madrid to Lisboa and my luggage no arrived

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.

Late. Lack of updates. Rude hostesses. Terrible food. Lack of headphones.

Awful. They didn't even show concern that her connecting flight( Dallas to Mardrid) was gone/missing. I don't understand how that is even possible. Rudest answer from one of the crew was that American Airlines sold the tickets to somebody else. My daughter was not in the list.

The flight was canceled on a Thursday last minute. I lost thousands of dollars in hotels and car rental

Excellent lie flat seat for premium economy! Great staff. Bad food . Not so great entertainment. My bag didn’t make it either.

Really like the idea experience on this airline I will use again

Plane delayed due to weather. Plane boarded, then told to unboard due to a maintenance issue.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

The staff was very nice and helpful. Some of the best crew I have met.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Was all good.l including a sofdrink. AA improved significantly. There was no entertainment.

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Economy Priority seats are extremely uncomfortable. There is no way to escape the boxed in feeling, particularely because the distance between to rows are too short, the hard edge of the front row is keeping legs confined. There is no elevated place to put your feet. I am of average, European size.

Terrible. Both flights were significantly delayed, no luggage, made me check my small bag when many, many others had much larger carry-ons, not even a bottle of water . . . I will not fly Discover Airlines again.

I was deceived on the Kayak site expecting a ticket, but instead finding a "standby" reservation. When I tried to change the ticket, I paid almost twice the price of the original ticket. Then, the airline refused to give me the reserved seat I had chosen and paid for. I think I deserve a refund for this leg of my trip because I was doubly charged and did not receive what I had paid for. I put in a complaint with Lufthansa because the ticket was sold originally sold as a flight they listed. Someone here needs to take responsibility.

Excellent service; they helped me reschedule so I can fly in an earlier flight

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

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

Information on your arrival and departure airports