WAS - OPO

$230 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 10/11. 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

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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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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

Mon, Nov 3 - Tue, Nov 11
Delta Logo
7:45 pm - 3:25 pmBWI-OPO
14h 40m2 stops
Delta Logo
11:10 am - 11:00 pmOPO-BWI
16h 50m2 stops
$491Delta
Find Deal
Thu, Oct 23 - Tue, Nov 4
Delta Logo
5:39 pm - 3:30 pmBWI-OPO
16h 51m2 stops
Delta Logo
11:10 am - 11:02 pmOPO-BWI
16h 52m2 stops
$528Delta
Find Deal
Thu, Nov 13 - Tue, Dec 2
United Airlines Logo
10:56 am - 9:30 amBWI-OPO
17h 34m2 stops
United Airlines Logo
6:00 am - 1:50 pmOPO-BWI
36h 50m2 stops
$530United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
6:30 am - 11:40 amIAD-OPO
25h 10m2 stops
United Airlines Logo
6:00 am - 11:59 pmOPO-IAD
22h 59m2 stops
$547United Airlines
Find Deal
Fri, Nov 7 - Tue, Nov 11
Lufthansa Logo
10:55 pm - 10:25 pmIAD-OPO
18h 30m2 stops
Lufthansa Logo
1:45 pm - 8:05 pmOPO-IAD
35h 20m1 stop
$556Lufthansa
Find Deal
Fri, Jan 23 - Sun, Feb 1
Iberia Logo
5:49 pm - 11:45 amDCA-OPO
12h 56m2 stops
Iberia Logo
12:25 pm - 10:39 pmOPO-DCA
15h 14m2 stops
$559Iberia
Find Deal
Thu, Oct 30 - Thu, Nov 6
Lufthansa Logo
11:55 pm - 10:25 pmIAD-OPO
18h 30m2 stops
Lufthansa Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$566Lufthansa
Find Deal
Thu, Oct 30 - Thu, Nov 6
KLM Logo
8:40 pm - 3:25 pmDCA-OPO
14h 45m2 stops
KLM Logo
11:20 am - 10:59 pmOPO-DCA
16h 39m2 stops
$581KLM
Find Deal
Thu, Nov 13 - Thu, Nov 27
KLM Logo
12:16 pm - 10:25 amBWI-OPO
17h 09m2 stops
KLM Logo
4:10 pm - 4:49 pmOPO-BWI
29h 39m2 stops
$698KLM
Find Deal
Mon, Mar 16 - Fri, Mar 20
Iberia Logo
12:37 pm - 7:40 amDCA-OPO
15h 03m2 stops
Iberia Logo
8:20 am - 8:10 pmOPO-DCA
15h 50m2 stops
$747Iberia
Find Deal

Everything you should know

Top airlines
Delta
Cheapest • from $491 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 15% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
November
Cheapest • 25% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$491
Delta
Mon 11/3Tue 11/11
BWI - OPO • 2 stops
Cheapest one-way
$230
Multiple Airlines
Sat 10/11
BWI - OPO • 2 stops
Start a new search
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We hope you love your trip to Porto!
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?

What’s the cheapest day of the week to fly from Washington, D.C. to Porto?

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

Your flight ticket price will generally be cheaper if you fly to Porto on a Sunday and more expensive on a Friday. On your return trip to Washington, D.C., you should consider flying back on a Monday, and avoid Wednesdays for better deals.

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 November, where tickets cost $529 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $911 and $852 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 15% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$230
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 16% 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 $230 for a one-way ticket and $491 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?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Washington, D.C. and Porto, with Star Alliance 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 $796 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 $687 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 7957 reviews
8.2Boarding
7.3Food
7.9Comfort
8.5Crew
7.9Entertainment
Airline reviews

Passengers need to check in big baggage instead of bringing on the plane. That cause inconvenience for everyone. Otherwise flight was good.

8.0 ExcellentTarun, Sep 2025MCO - LHR
Read more Delta reviews

Passengers need to check in big baggage instead of bringing on the plane. That cause inconvenience for everyone. Otherwise flight was good.

Perfect flight both ways. On time, courteous staff, plane comfortable and cool. Best domestic flights I’ve had in awhile.

The food was terrible especially for a 15 hour international flight. The crew was unpleasant as well.

Really low quality food especially for an international flight. The crew also was surprisingly unpleasant except couple of ladies. I know we were not in first class but that’s no reason to treat customers as less.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

Quick check in. Everything went smooth. I don't know what can be done about airline food.

Crew was good. The reservation got mixed up and they didn't have my TSA number. I am also a Silver Medallion and wasn't able to use Sky Priority.

Delta made it easy, comfortable and timely. The crew was fantastic.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Nothing special. The crew never went out of their way for anything.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Klm start boarding while somw air issue in the plan

The service was great. However the lounge only gets passing grade

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Very small cramped plane for an international flight. Everything else was good, but it was maybe the smallest comfort-wise I've ever been on for longer than 3-4 hours and the trip was 7.5

Flight was delayed 3 hours. No food and drink vouchers was provided. They offered a mini pretzel bag and water .

Staff was rude. Didn’t give water for 2 hours. Worst service

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

We were given vouchers we couldn’t use with a 5.5 hour delay

I fly UAL 7-8 times per year. This flight was not up to snuff because it boarded very late "due to unexpected delays in restocking the plane" and yet Flight Aware showed the plane had landed some 10 hours earlier--so I think they could have planned accordingly. The FA's were nice but harried. The video system had to be rebooted 3-4 times. The food service was rather abrupt; they forgot my row and when I asked for my meal, they brought it with some impatience. Overall, the flight was fine, but the little details made it feel somewhat mundane and hurried.

An old airplane with very uncomfortable seats in the Comfort “class! Small, narrow, and hard seat. Entertainment options are inferior, old movies. Boarding started at the back of the airplane, as we entered the aircraft last instead of after business class, risking the possibility that the comfort section would not have room for carry-on in the overhead bin. The food was ok. White wine was terrible. Overall, the flight felt worse than cheap airliners, and the price was as high as premium carriers.

I will avoid TAP if I can, the ground experience was very poor with bad behaviour from the ground crew and it was only a bit better on the aircraft.

I had a business class ticket from EWR to Madrid with a layover at LIS for 11 hours. It was obvious that I needed to pick up my luggage in Lisbon for 11 hours and check it in again when boarding the second flight to Madrid. Before buying the ticket, I called TAP customer service. Customer service assured me that I could get my luggage in Lisbon. When I arrived at Newark airport, I immediately asked to check my luggage to Lisbon. However, the TAP employee refused me, saying that I should resolve this issue upon arrival in Lisbon. She checked my luggage to Madrid. I asked the TAP employee at the gate to help me when boarding the plane, I asked the flight attendants manager on board the plane to help me. All the employees refused to help me and said that I should resolve this issue in Lisbon. It took me 4 hours to resolve this issue in Lisbon. I arrived at 11am and they didn't give me my luggage until 3pm. As a result, I was so tired after a sleepless night on the plane and 4 hours on my feet at the airport and all my plans were ruined that I couldn't fly to Madrid. It was a terrible experiance,

The seats were not designed to comfortably see people in coach for more than 10 minutes

A good, comfortable flight with friendly crew and good entertainment options.

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!

There was chaos at the Naples airport. We arrived three hours early for the flight but there was no invitation available about where to go to check bags until an hour later. Then we had to go to a different terminal to check our bags and check in and back to the first to board.

We flew TAP last October from Newark to Lisbon. The meal was bad. This flight had good food. Also, this flight was delayed. There were TAP employees waiting at Lisbon to make sure we made our connecting flight. I find the TAP website and app frustrating, but the service once we reached the airport was very good

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

Boarding too way too long. Biggest peeve: zero in-seat power in economy! No plug sockets, no USB ports. Plane was an A330, so not old.

It was fortunate that the flight arrived in London in accordance with schedule, and the luggage was promptly transferred to the luggage carousel. However, I find it concerning that even minor issues in economy cabins are prevalent within the industry. American Airlines, in particular, appears to have the least legroom and feels more crowded due to the proximity of neighboring passengers. Additionally, the crew’s adherence to protocol is inconsistent. While they may enforce certain rules set by the FAA on a select few individuals, they often overlook numerous violations, such as failing to reset seat recline during landing.

We liked the flight but while we purchased an aisle seat, our seats had a different configuration on this flight. A fellow passenger suggested that the airplane had been changed. Too bad we were not informed and had no chance to modify our seat preferences. We were stuck in the window and middle seats with no chance to walk around and go to the bathroom without disturbing our sleeping fellow passenger.

The crew were not very personable. The crew did not serve tea or coffee. The bathroom was not kept clean. Two out of the 5 toilets in the cabin weren't working.

It was extremely cold in the back of the plane. The seats are uncomfortable and space very small. Crew was excellent as usual.

Check in needed to be in person, not nice. Also I won’t do connections in Charlotte again because you need to go through security again and short connections become a problem

Iberia lost my bag, said they found it in another country, said they sent it to me, but never did. Went my whole trip without my stuff, but expecting it to show up because that’s what they said would happen. Their communication sucks, their website sucks, and to top it all off, their seats are small and uncomfortable. They’re bad at their jobs and they should feel bad about themselves. Do not even get me started on the flight home. AVOID!

I described my experience in the previous window. I didn't realize that there would be another opportunity for this flight. Please look at my response in the previous window.

Boarding was 2 1/2 late no explanation Captain said he did not know why, but he rested at home for an extra couple of hours. Food was edible, Nothing more.

I liked the comfort of the plane. It was unexpected from past experiences.

BEWARE!!! Iberia changes your seats at random. I paid for a window seat and they changed it to one in the middle aisle resting against the bathroom- can’t lean back + hear every flush. This on a 11 hour flight.. There were families that were broken up with separate seats all over the plane. Lots of upset passengers showing their seat confirmation to the besieged and helpless airline steward. Also, the gluten free meal was tasteless.

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

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