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$259+ Cheap flights from Dulles Intl (IAD) to Porto (OPO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — OPO
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Porto are usually found in February or October, booked 58 days in advance, depart on a Sunday or Saturday and return on a Monday

Cheap flight deals from Dulles Intl to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 12, 2025.

Round-trip from

$667
(Iberia)

One-way from

$259
(Cheapflightsfares)

Popular in

December

Cheapest in

February

Average price

$852
From Washington, D.C. Dulles Intl to Porto
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One-way flight from Washington, D.C. Dulles Intl to Porto
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Highest demand for flights based on searches. 0% potential increase in price ($5 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Dulles Intl to Porto

Cheapest flights from Dulles Intl to Porto
Explore the most affordable flight options available from Dulles Intl to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Iberia deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2210:40 pmIAD - OPO
2 stops27h 55mIberia
Mon 9/294:35 pmOPO - IAD
1 stop27h 25mIberia
Deal found 6/12$667
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/148:50 amIAD - OPO
2 stops19h 45mUnited Airlines
Tue 7/2212:50 pmOPO - IAD
2 stops23h 37mUnited Airlines
Deal found 6/11$668
This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/155:25 pmIAD - OPO
1 stop35h 10mMultiple Airlines
Tue 7/228:40 amOPO - IAD
1 stop12h 35mMultiple Airlines
Deal found 6/11$672
This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/238:45 pmIAD - OPO
1 stop30h 10mSWISS
Mon 6/307:20 pmOPO - IAD
1 stop25h 55mSWISS
Deal found 6/11$673
This FlightHub deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/285:50 pmIAD - OPO
1 stop11h 10mTAP AIR PORTUGAL
Thu 9/49:00 amOPO - IAD
1 stop11h 20mTAP AIR PORTUGAL
Deal found 6/9$678
This Cheapflightsfares deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:00 pmIAD - OPO
2 stops13h 50mLufthansa
Sun 11/166:00 amOPO - IAD
2 stops19h 05mLufthansa
Deal found 6/12$679
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:30 pmIAD - OPO
1 stop32h 55mDelta
Thu 9/254:20 pmOPO - IAD
2 stops24h 30mDelta
Deal found 6/12$682
This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/169:45 amIAD - OPO
2 stops27h 45mAir Canada
Sat 10/256:00 amOPO - IAD
2 stops20h 05mAir Canada
Deal found 6/11$685
This Turkish Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/199:40 pmIAD - OPO
1 stop31h 05mTurkish Airlines
Wed 9/244:50 pmOPO - IAD
1 stop31h 55mTurkish Airlines
Deal found 6/12$688
This Scandinavian Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1410:05 pmIAD - OPO
1 stop14h 00mScandinavian Airlines
Wed 8/2011:50 amOPO - IAD
1 stop13h 09mScandinavian Airlines
Deal found 6/9$709
This KAYAK deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/110:40 pmIAD - OPO
1 stop15h 50mBritish Airways
Wed 7/238:20 pmOPO - IAD
1 stop28h 50mBritish Airways
Deal found 6/11$721
This KLM deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/235:25 pmIAD - OPO
1 stop12h 15mKLM
Wed 7/26:15 amOPO - IAD
1 stop14h 20mKLM
Deal found 6/10$741

Cheapflights Fare Finder

Customize your flight search to find flights from Dulles Intl to Porto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Porto that are best for you.

Fly from

Dulles Intl

Fly to

Porto

Route

Depart

Return

Price

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 9/22

10:40 pm-7:35 am

2 stops27h 55m

Porto

Mon 9/29

4:35 pm-3:00 pm

1 stop27h 25m

$667

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 7/14

8:50 am-9:35 am

2 stops19h 45m

Porto

Tue 7/22

12:50 pm-7:27 am

2 stops23h 37m

$668

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Tue 7/15

5:25 pm-9:35 am

1 stop35h 10m

Porto

Tue 7/22

8:40 am-4:15 pm

1 stop12h 35m

$672

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Mon 6/23

8:45 pm-7:55 am

1 stop30h 10m

Porto

Mon 6/30

7:20 pm-4:15 pm

1 stop25h 55m

$673

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 8/28

5:50 pm-10:00 am

1 stop11h 10m

Porto

Thu 9/4

9:00 am-3:20 pm

1 stop11h 20m

$678

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 11/13

6:00 pm-12:50 pm

2 stops13h 50m

Porto

Sun 11/16

6:00 am-8:05 pm

2 stops19h 05m

$679

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Wed 9/17

6:30 pm-8:25 am

1 stop32h 55m

Porto

Thu 9/25

4:20 pm-11:50 am

2 stops24h 30m

$682

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 10/16

9:45 am-6:30 pm

2 stops27h 45m

Porto

Sat 10/25

6:00 am-9:05 pm

2 stops20h 05m

$685

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Fri 9/19

9:40 pm-9:45 am

1 stop31h 05m

Porto

Wed 9/24

4:50 pm-7:45 pm

1 stop31h 55m

$688

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

Thu 8/14

10:05 pm-5:05 pm

1 stop14h 00m

Porto

Wed 8/20

11:50 am-7:59 pm

1 stop13h 09m

$709

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 25 results
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Best time to book a flight from Dulles Intl to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Dulles Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Porto

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Porto. Price data was last updated on June 9, 2025.

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to Porto, you should look to book at least 58 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Porto?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Porto (average of $523). Flying from Washington, D.C. Dulles Intl Airport to Porto in June is currently the most expensive (average of $1,047). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to OPO?

Find hourly flight availability from Dulles Intl to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Porto in the morning. Doing so could potentially save you 23% on the flight price compared to flying in the afternoon, which is usually more expensive.

Rainfall in Porto by month

Plan your trip to Porto by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

Temperature in Porto by month

Plan your trip to Porto by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated June 12, 2025.
To help decide which airline to fly from Washington, D.C. to Porto, see what other customers have to say about Delta, Porter Airlines and KLM. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Porter Airlines
8.0
Very good
288 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Porto from Washington, D.C. Dulles Intl?

    Located just 6.8 mi from the city center, Porto is the airport most travelers will use when flying to Porto from Washington, D.C. Dulles Intl. Booking flights from Washington, D.C. Dulles Intl to Porto (OPO) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. Dulles Intl from 9 different airlines.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Porto round-trip?

    Currently priced at $667, Iberia will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to Iberia, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and SWISS - these airlines can fly you to your destination from $668 and $673, respectively. These flights start at 7% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Porto one-way?

    $259 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on Scandinavian Airlines and Air Canada, with prices starting from $462 and $489, respectively.

  • Can I find deals for flights from Dulles Intl to Porto that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Porto.

  • Can I find deals for business class flights from Dulles Intl to Porto?

    Yes. Cheapflights offers flight deals from Dulles Intl to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Porto?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Porto (average of $523). Flying from Washington, D.C. Dulles Intl Airport to Porto in June is currently the most expensive (average of $1,047). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos
Arcos de Valdevez

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Top 9 airlines flying from Dulles Intl to Porto

Discover the top 9 airlines that operate flights from Dulles Intl to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$418Average$820FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$422Average$422FlexibilityNo cancel feeOn-time77%
KLMCheapest$430Average$662FlexibilityNo cancel feeOn-time75%
TAP AIR PORTUGALCheapest$459Average$734FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$515Average$736FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$543Average$810FlexibilityNo cancel feeOn-time69%
SWISSCheapest$554Average$666FlexibilityNo cancel feeOn-time79%
American AirlinesCheapest$573Average$736FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$603Average$696FlexibilityNo cancel feeOn-time76%

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