£253 Cheap Flights from Washington (IAD) to Porto (OPO)

View £253 flight on Mon, 19 Oct 2026Opens in a new window

Popular airlines from Washington Dulles International Airport (IAD) to Porto Airport (OPO)

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Cheap Flights from Washington (IAD) to Porto (OPO)

Prices were available within the past 7 days and start at £253 for one-way flights and £540 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KLM
Wed, 18 Nov - Wed, 25 Nov
IAD
Washington
OPO
Porto
£540 Return, found 7 hours ago
£540
Return
found 7 hours ago
Select KLM flight, departing Wed, 18 Nov from Washington to Porto, returning Wed, 25 Nov, priced at £540 found 7 hours ago
KLM
Wed, 9 Dec - Wed, 16 Dec
IAD
Washington
OPO
Porto
£541 Return, found 4 days ago
£541
Return
found 4 days ago
Select KLM flight, departing Wed, 9 Dec from Washington to Porto, returning Wed, 16 Dec, priced at £541 found 4 days ago
KLM
Wed, 18 Nov - Wed, 25 Nov
IAD
Washington
OPO
Porto
£543 Return, found 7 hours ago
£543
Return
found 7 hours ago
Select KLM flight, departing Wed, 18 Nov from Washington to Porto, returning Wed, 25 Nov, priced at £543 found 7 hours ago
KLM
Wed, 9 Dec - Wed, 16 Dec
IAD
Washington
OPO
Porto
£544 Return, found 4 days ago
£544
Return
found 4 days ago
Select KLM flight, departing Wed, 9 Dec from Washington to Porto, returning Wed, 16 Dec, priced at £544 found 4 days ago
Lufthansa
Wed, 28 Oct - Wed, 4 Nov
IAD
Washington
OPO
Porto
£545 Return, found 7 hours ago
£545
Return
found 7 hours ago
Select Lufthansa flight, departing Wed, 28 Oct from Washington to Porto, returning Wed, 4 Nov, priced at £545 found 7 hours ago
KLM
Wed, 28 Oct - Wed, 4 Nov
IAD
Washington
OPO
Porto
£545 Return, found 7 hours ago
£545
Return
found 7 hours ago
Select KLM flight, departing Wed, 28 Oct from Washington to Porto, returning Wed, 4 Nov, priced at £545 found 7 hours ago
Air France
Wed, 9 Dec - Wed, 16 Dec
IAD
Washington
OPO
Porto
£546 Return, found 4 days ago
£546
Return
found 4 days ago
Select Air France flight, departing Wed, 9 Dec from Washington to Porto, returning Wed, 16 Dec, priced at £546 found 4 days ago
Iberia
Wed, 28 Oct - Wed, 4 Nov
IAD
Washington
OPO
Porto
£548 Return, found 7 hours ago
£548
Return
found 7 hours ago
Select Iberia flight, departing Wed, 28 Oct from Washington to Porto, returning Wed, 4 Nov, priced at £548 found 7 hours ago
Air France
Tue, 27 Oct - Tue, 3 Nov
IAD
Washington
OPO
Porto
£551 Return, found 7 hours ago
£551
Return
found 7 hours ago
Select Air France flight, departing Tue, 27 Oct from Washington to Porto, returning Tue, 3 Nov, priced at £551 found 7 hours ago
Swiss International Air Lines
Tue, 17 Nov - Tue, 24 Nov
IAD
Washington
OPO
Porto
£552 Return, found 7 hours ago
£552
Return
found 7 hours ago
Select Swiss International Air Lines flight, departing Tue, 17 Nov from Washington to Porto, returning Tue, 24 Nov, priced at £552 found 7 hours ago

Alternative airports near Porto

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Dr. Francisco de Sa Carneiro OPO. Cheapest and Closest option available. Average driving time to city centre is 14 minutes. Flights from £807
OPO
Dr. Francisco de Sa Carneiro
CheapestClosest
Average driving time to city centre14 min
Flights from £807

Find the cheapest month to fly from Washington (IAD) to Porto (OPO)

November is typically the cheapest month to fly

From £384 - £535 per traveller.

Frequently asked questions

How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
There are approximately 64 connecting flights per day from Washington Dulles Intl. (IAD) to Dr. Francisco de Sa Carneiro (OPO). Some common connection points include Pearson Intl. (YYZ), Pierre Elliott Trudeau Intl. (YUL), and Heathrow (LHR).
What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
The earliest flight from Washington Dulles Intl. (IAD) to Dr. Francisco de Sa Carneiro (OPO) typically departs at approximately 5:00 AM local time, operated by American Airlines. This is a seasonal service active in March. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
If you're flying from Washington Dulles Intl. (IAD) to Dr. Francisco de Sa Carneiro (OPO), you'll typically find the most flights on a Saturday, with around 69 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include United Airlines, Delta Air Lines, and British Airways. Looking at the overall week, Saturdays offer notably more flight options compared to other days, making it a great day to find a flight that suits your schedule.
What are the most popular departure times for flights from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
The most popular departure times for flights from Washington Dulles Intl. (IAD) to Dr. Francisco de Sa Carneiro (OPO) are in the afternoon, from 3pm to 6pm. About 42% of passengers prefer this time. Many major carriers, including TAP Air Portugal, Lufthansa and United Airlines, offer flights during this window. This timing works well because it allows you to have a productive morning before heading to the airport, and you'll arrive at your destination in the evening.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
Flights from IAD to OPO with one stop typically take around 16 hours 20 minutes, covering approximately 3,540 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
Select the "Business class" and "First class" filters when looking for IAD to OPO flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Porto from Washington Dulles Intl. (IAD)?
From Washington Dulles Intl. (IAD), you can fly directly into Dr. Francisco de Sa Carneiro (OPO) to reach Porto. Some flights may connect through major hubs like Heathrow (LHR), Pearson Intl. (YYZ), Charlotte-Douglas Intl. (CLT) before reaching Porto. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro) flight and hotel package?
Securing a Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro)?
If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Porto (OPO-Dr. Francisco de Sa Carneiro) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Dr. Francisco de Sa Carneiro
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Iberia, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Return price
£540
Distance
5663 km

Book with confidence

Compare flights from Washington to Porto easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Washington to Porto. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Dr. Francisco de Sa Carneiro in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Washington Dulles Intl. to Dr. Francisco de Sa Carneiro.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Washington Dulles Intl. (IAD) to Dr. Francisco de Sa Carneiro (OPO)

The easiest way to view the best deals on flights from Washington to Porto today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Washington Dulles Intl. to Dr. Francisco de Sa Carneiro start at just £540 and range up to £552.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Washington and Porto
  • booking your flight during November, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Washington to Porto flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Washington Dulles Intl. to Dr. Francisco de Sa Carneiro for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Washington to Porto easily and book with confidence

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*Available to Expedia members.