WAS - OPO

$241 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 10/6. 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

Tue, Sep 23 - Tue, Sep 30
 Logo
9:45 am - 3:00 pmIAD-OPO
24h 15m2 stops
 Logo
11:50 am - 4:15 pmOPO-IAD
33h 25m2 stops
Sun, Nov 9 - Wed, Nov 19
 Logo
8:30 pm - 11:15 amIAD-OPO
33h 45m1 stop
 Logo
6:00 am - 8:29 pmOPO-IAD
19h 29m2 stops
Sun, Nov 9 - Thu, Nov 20
United Airlines Logo
5:33 pm - 9:30 amIAD-OPO
10h 57m1 stop
United Airlines Logo
6:00 am - 3:50 pmOPO-IAD
14h 50m1 stop
$481United Airlines
Find Deal
Mon, Nov 17 - Tue, Nov 25
 Logo
9:55 am - 12:05 pmIAD-OPO
21h 10m2 stops
 Logo
6:00 am - 8:29 pmOPO-IAD
19h 29m2 stops
Sun, Nov 9 - Wed, Nov 19
United Airlines Logo
7:00 pm - 9:30 amDCA-OPO
9h 30m1 stop
United Airlines Logo
6:00 am - 8:55 amOPO-DCA
31h 55m2 stops
$487United Airlines
Find Deal
Sun, Sep 7 - Sun, Sep 14
TAP AIR PORTUGAL Logo
10:20 pm - 5:00 pmIAD-OPO
13h 40m1 stop
TAP AIR PORTUGAL Logo
7:00 am - 3:20 pmOPO-IAD
13h 20m1 stop
$505TAP AIR PORTUGAL
Find Deal
Sun, Sep 14 - Tue, Sep 23
TAP AIR PORTUGAL Logo
10:20 pm - 3:20 pmIAD-OPO
12h 00m1 stop
TAP AIR PORTUGAL Logo
10:00 am - 8:50 pmOPO-IAD
15h 50m1 stop
$507TAP AIR PORTUGAL
Find Deal
Sun, Nov 2 - Tue, Nov 11
KLM Logo
6:50 pm - 10:30 amIAD-OPO
10h 40m1 stop
KLM Logo
11:25 am - 11:00 pmOPO-IAD
16h 35m2 stops
$523KLM
Find Deal
Mon, Nov 17 - Tue, Nov 25
Delta Logo
12:15 pm - 10:30 amBWI-OPO
17h 15m2 stops
Delta Logo
11:25 am - 10:56 pmOPO-BWI
16h 31m2 stops
$528Delta
Find Deal
Wed, Nov 19 - Fri, Nov 28
Delta Logo
12:30 pm - 10:30 amIAD-OPO
17h 00m2 stops
Delta Logo
6:30 am - 7:11 pmOPO-IAD
17h 41m2 stops
$542Delta
Find Deal
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 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 $487 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $886 and $852 respectively.

Good to know

Low seasonJanuary
Cheapest flight$241
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 20% increase in price.
Flight from Washington Dulles Airport 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 $241 for a one-way ticket and $474 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, oneworld, and SkyTeam 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 $646 and an overall rating of 8.0, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $667 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.
8.0
DeltaOverall score based on 7980 reviews
7.9Entertainment
7.3Food
8.2Boarding
8.5Crew
7.9Comfort
Airline reviews

My experience on any Delta flight is always overshadowed by the time Delta removed me from a flight for no apparent reason.

2.0 MediocreGim, Jul 2025BGM - DTW
Read more Delta reviews

My experience on any Delta flight is always overshadowed by the time Delta removed me from a flight for no apparent reason.

Delayed and took off even later than the scheduled delay time

For a 69 year old with health problems I had the worse experience, no wheelchair when I entered a lady told me to sit and wait while a gentleman told me I had to walk to the Delta station, which I did. I had a carry on and a bag, and I was traveling with my service dog, which was on his carrier and the lady charged me for my carry on luggage, beside all the waiting cause of the delay, I had to walk to get my luggage cause no wheelchair showed up, I am so disappointed. I will get in touch with the company. I got home at 3:00 am, not good for my health situation.

Only issue was with seating. The economy fare we purchased did say there was no guarantee the three people in our party would be seated together, and we were not. At the gate, the agent told us more specifically, the fare we purchased meant we would be seated in middle seats only. This should just be made more obvious.

Great experience on Delta. Staff from baggage check to flight attendants were very courteous and professional. My only issue was a personal preference for pretzels instead of the chips and cookies that were offered.

There was no problems, just a little uncomfortable with seats that do not lay back a little

Always good but we must do something about people in rows ahead of you that don't put their seats back up when they are suppose to. And It's rough to not be able to even lean over to get something out of my purse.

Flight was delayed, 30+ bags had to be gate checked. Crew were very friendly!

Everything was good until we were boarding our connection flight in Atlanta, we were told to gate check our carry-on, but when we got inside the plane, there was plenty of room in the overhead.

Did not know my son and I had different seating arrangements. He was fine, but it was disappointing.

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.

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.

You should not have to pay for WiFi in business class

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

Terrible. Delayed 7 hours, and cancelled the flight, leaving me stranded and out of pocket $500 for an alternative last minute flight

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

the delay for 3 hours was understandable due to weather conditions but the flight should’ve provided some on flight compensations or at least provide more food.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

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.

I didn’t get on plane. Passport being processed by consulate with visa application. Tried to cancel through underpricer after purchasing cacelling for any reason. No dice, they are thieves.

When I booked it on Kayak it aaid that I wasn't allowed hamd luggage. I called United Airlines and it took them 6 minutes to figure out if I was allowed free hand luggage. Surely something that simple they should be able to tell me instantly.

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.

boarding is so disorganized, i was literally appalled at the boarding experience

Comfortable but not Polaris or Delta comfort Business Class. Overall 7 out of 10

Tap air Portugal was the best I will traveling again with u guys. Thank u.

The long wait at JFK made the trip horrible. Also not having enough buses when we deplaned was annoying

Terrible! I had to cancel our flights due to my wife Carmen requiring an unexpected second cancer surgery. I first contacted orbitz about obtaining a credit due to medical interruption and orbitz directed me to TAP. I contacted TAP and the representative directed me back to orbitz and refused to even explain what TAP’s medical interruption policy was or how it worked—I wanted that information for a second call to orbitz. Terrible service at a particularly difficult time.

Food was edible, not great, and served by attendants who looked like they really were not happy working the flight. The section I was in was too warm making the 11 hour flight uncomfortable. Other areas on the plane were fine.

Our flight was delayed for over an hour due to weather, and it had already been a long travel day. However, the crew was calm and compassionate, listening to every complaint with genuine concern. They got us home safely without incident, in spite of all of the obstacles. I’m grateful.

Hate their old flights, boatding, food and services. Very poor quality

Insulting. Lufthansa flight from Munich to EWR had us getting our luggage when we were told in Florence that it would follow us to Indianapolis. It did not. Then very slow security in EWR caused me and three other passengers from Lufthansa flight from Munich to miss the boarding closure. Behind me were two elderly grandparents and their ten year old grandson. We were all refused entry on a plane to Indy that was still at the gate. The doors had not even closed inside the terminal yet. No apologies or compensation offered. Not even a meal voucher let alone a free hotel stay for our inconvenience. I m not sure what the other three passengers behind me did ( they were elderly with a grandson, recall), but I stated 12 hours overnight in a chilly EWR airport until next flight to Indy at 850 next morning.

The food could be better, more snacks. And have some plugs to chargue the phone.

The pasta in the evening meal was tasteless. Otherwise, the flight was okay.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

Seating was average for a first class seat. It very modern. I expected better.

Flight was a little late. The crew was courteous, food ok

Bad! Disaster!! The LH419 was cancelled after 4 hrs on board with no AC and no toilets

Poor food on flight between Toronto and Stockholm Airport Toronto too crowded

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

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