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Cheap flights from Washington Dulles to Porto

Compare Washington Dulles to Porto flight deals

Find the cheapest month or even day of the year to fly to Porto

Book the best Porto fare with no extra fees

Flight deals from Washington Dulles to Porto

Looking for a cheap last-minute deal or the best round-trip flight from Washington Dulles to Porto? Find the lowest prices on one-way and round-trip tickets right here.
Porto.C$650 per passenger.Departing Mon, Oct 20, returning Mon, Oct 27.Round-trip flight with TAP Air Portugal and Iberia.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Mon, Oct 20, arriving in Porto.Inbound indirect flight with Iberia, departing from Porto on Mon, Oct 27, arriving in Washington Dulles.Price includes taxes and charges.From C$650, select.
Porto.C$655 per passenger.Departing Wed, Dec 10, returning Wed, Dec 17.Round-trip flight with Lufthansa.Outbound indirect flight with Lufthansa, departing from Washington Dulles on Wed, Dec 10, arriving in Porto.Inbound indirect flight with Lufthansa, departing from Porto on Wed, Dec 17, arriving in Washington Dulles.Price includes taxes and charges.From C$655, select.
Porto.C$656 per passenger.Departing Tue, Mar 3, returning Tue, Mar 10.Round-trip flight with United and Lufthansa.Outbound indirect flight with United, departing from Washington Dulles on Tue, Mar 3, arriving in Porto.Inbound indirect flight with Lufthansa, departing from Porto on Tue, Mar 10, arriving in Washington Dulles.Price includes taxes and charges.From C$656, select.
Porto.C$659 per passenger.Departing Mon, Sep 15, returning Wed, Oct 1.Round-trip flight with TAP Air Portugal and Air Europa.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Mon, Sep 15, arriving in Porto.Inbound indirect flight with Air Europa, departing from Porto on Wed, Oct 1, arriving in Washington Dulles.Price includes taxes and charges.From C$659, select.
Porto.C$659 per passenger.Departing Mon, Sep 15, returning Mon, Sep 22.Round-trip flight with TAP Air Portugal and Ryanair.Outbound indirect flight with TAP Air Portugal, departing from Washington Dulles on Mon, Sep 15, arriving in Porto.Inbound indirect flight with Ryanair, departing from Porto on Mon, Sep 22, arriving in Washington Dulles.Price includes taxes and charges.From C$659, select.
Porto.C$660 per passenger.Departing Wed, Nov 26, returning Wed, Dec 3.Round-trip flight with United.Outbound indirect flight with United, departing from Washington Dulles on Wed, Nov 26, arriving in Porto.Inbound indirect flight with United, departing from Porto on Wed, Dec 3, arriving in Washington Dulles.Price includes taxes and charges.From C$660, select.
Porto.C$660 per passenger.Departing Tue, Nov 11, returning Tue, Nov 18.Round-trip flight with United.Outbound indirect flight with United, departing from Washington Dulles on Tue, Nov 11, arriving in Porto.Inbound indirect flight with United, departing from Porto on Tue, Nov 18, arriving in Washington Dulles.Price includes taxes and charges.From C$660, select.
Porto.C$663 per passenger.Departing Wed, Nov 19, returning Thu, Feb 19.Round-trip flight with United and Lufthansa.Outbound indirect flight with United, departing from Washington Dulles on Wed, Nov 19, arriving in Porto.Inbound indirect flight with Lufthansa, departing from Porto on Thu, Feb 19, arriving in Washington Dulles.Price includes taxes and charges.From C$663, select.

Find the cheapest month to fly from Washington Dulles to Porto

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Porto flights are currently cheapest in October.
Aug
from C$745
Sep
from C$659
Oct
from C$650
Nov
from C$660
Dec
from C$655
Jan
from C$681
Feb
from C$690
Mar
from C$656
Apr
from C$835
May
from C$769
Jun
from C$984
Jul
from C$1,171

Washington Dulles to Porto: Alternative routes

Compare routes from Washington Dulles to Porto below. You may find an airport to fly into that's cheaper, faster, or easier than Porto.

Washington, D.C. to Porto: Flight information

The things to know before you go.
Cheapest flight foundC$650
Cheapest month to flyOctober

Finding cheap flights from Washington Dulles to Porto: Frequently asked questions

The best price we found for a round-trip flight from Washington Dulles to Porto is C$650. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Washington Dulles to Porto. But we found flights with one or more stops from C$650.
There are no flights flying from Washington Dulles to Porto, as of August 2025.
The cheapest month to fly from Washington Dulles to Porto is usually October.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Porto Airport on Monday, October 20, 2025.
No airlines currently offer direct flights between Washington Dulles Airport and Porto Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Porto but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Porto is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, TAP Air Portugal offers the cheapest flight tickets to Porto.

Travelling from Washington Dulles International Airport (IAD) to Porto Airport (OPO): what you need to know

  • Porto is four hours ahead of Washington DC and observes the UTC+0 timezone.

  • Give yourself enough time to catch your IAD to OPO flight. A good rule of thumb is to arrive two hours before international departures and an hour ahead for domestic flights.

  • Flying during a peak month like April? Public holidays and other popular seasons can mean longer queues and delays at check-in and security. Be extra cautious and get there up to four hours ahead of an international flight and two hours before a domestic departure.

  • We make it a breeze to book a flight with a stopover. To see your options for tickets from Washington Dulles International Airport to Porto Airport, uncheck 'Direct flights only.' Then, pick a flight that has a stop long enough to tour the city of your choice. Top stopovers between IAD and OPO include:

    • Logan International Airport

    • Pearson International Airport

    • Newark Liberty International Airport

How to find the cheapest flights from Washington Dulles International Airport (IAD) to Porto Airport (OPO)

  • The cheapest price we've found for a one-way Washington Dulles International Airport to Porto Airport flight is C$339. A return plane ticket is currently C$650. Depending on the availability when you book, these fares can change.

  • To find cheap tickets from IAD to OPO, book in advance. Airlines tend to offer their best fares when flights are first made available.

  • If you're willing to be flexible with your travel dates, try using the 'Whole month' tool. It'll give you the lowest price across the month when looking for your flight from Washington Dulles International Airport to Porto Airport.

  • Picking up cheap flights from IAD to OPO is a breeze with Price Alerts. All you need to do is create one of these automatic alerts and we'll get in touch when there's a better deal.

  • Secure the ideal flight for you with the help of the filters. To see the 'Best,' 'Fastest' or 'Cheapest' flights from Washington Dulles International Airport to Porto Airport, use the 'Sort by' tool. You can also filter by airline, departure and arrival times, and number of stops.

Handy information about Washington Dulles International Airport (IAD)

  • The address for IAD is 1 Saarinen Circle.

  • Of the departures from Washington Dulles International Airport, 74.39% land on schedule at their destination.

  • To reach Washington Dulles International Airport from central Washington DC, it takes about 50 minutes if you're planning to drive. This depends on traffic, however. It's approximately 56 kilometres from the airport to the city centre.

  • You can expect a trip time of about 3 hours 25 minutes when using public transport.

  • Booked an early flight from Washington Dulles International Airport to Porto Airport? Avoid rushing to the airport (and get some extra shut-eye) by choosing one of these stays near IAD:

Arriving at Porto Airport (OPO)

  • Consider staying in a hotel close to OPO if you're taking a late Washington Dulles International Airport to Porto Airport flight. Settle into one of these accommodation options and make your arrival easier:

  • Go where the road takes you with a Porto Airport rental car. Pick up your wheels from Klass Wagen, Goldcar or Drive & Go and venture far and wide through Porto and beyond.

  • For the best deal, reserve your ride from Porto Airport around three weeks before you travel.

Getting from Porto Airport (OPO) to central Porto

  • From Porto Airport, Porto is approximately 16 kilometres away. It takes around 20 minutes to drive to the centre.

  • Travelling by public transport takes about 50 minutes.

When to fly to Porto Airport (OPO)

  • August is the most popular month for flights from Washington Dulles International Airport to Porto Airport. To escape the crowds, travel to Porto in January.

  • Lock in your flight from Washington Dulles International Airport to Porto Airport for August if you want to go to Porto during its warmest month. Expect temperatures of between 14ºC (57ºF) and 32ºC (90ºF).

  • If you want cooler conditions, search for a cheap ticket from IAD to OPO in January. Temperatures average between 3ºC (37ºF) and 14ºC (57ºF) then.

Explore more of Portugal

  • Lisbon is just one of the many places in Portugal waiting to be discovered once you've seen the sights of Porto. Around 274 kilometres away to the south, well-known attractions include Torre de Belem Garden, Estrela At Lisbon - Tram 28 and Archaeological museum of Sao Jorge Castle.

  • Around 274 kilometres south of Porto, Amadora is another essential stop in Portugal. No visit is complete without checking out Jardim Porta do Viveiro Alfragide, Jardim Caracol do Victor Alfragide and Jardim e estatua Eduardo Jorge.

Plan the rest of your trip from Washington, D.C. to Porto

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.