Porto

$250+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — OPO
jul. 16 — jul. 231
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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 julio 11, 2025.

Round-trip from

$625
(Lufthansa)

One-way from

$250
(Mytrip)

Popular in

December

Cheapest in

February

Average price

$883
From Washington, D.C. Dulles Intl to Porto
One-way flight from Washington, D.C. Dulles Intl to Porto
Highest demand for flights based on searches. 0% potential increase in price ($5 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Average for round-trip flights in July 2025

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 julio 11, 2025.

This Lufthansa deal was found by Cheapflights users on 7/10. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/216:10 pmIAD - OPO
1 stop16h 30mLufthansa
vie. 10/106:15 amOPO - IAD
2 stops14h 35mLufthansa
Deal found 7/10$625
This oojo deal was found by Cheapflights users on 7/7. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/2210:20 pmIAD - OPO
1 stop15h 40mTAP AIR PORTUGAL
vie. 8/298:50 amOPO - IAD
1 stop11h 30mTAP AIR PORTUGAL
Deal found 7/7$629
This United Airlines deal was found by Cheapflights users on 7/8. 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.
jue. 8/215:53 pmIAD - OPO
1 stop10h 52mUnited Airlines
jue. 8/2812:10 pmOPO - IAD
2 stops30h 39mUnited Airlines
Deal found 7/8$630
This Mytrip deal was found by Cheapflights users on 7/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/285:50 pmIAD - OPO
2 stops17h 15mMultiple Airlines
lun. 9/110:00 pmOPO - IAD
2 stops27h 50mMultiple Airlines
Deal found 7/9$631
This KLM deal was found by Cheapflights users on 7/8. 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.
lun. 9/228:17 pmIAD - OPO
2 stops14h 13mKLM
mié. 10/88:10 pmOPO - IAD
1 stop24h 25mKLM
Deal found 7/8$636
This Air France deal was found by Cheapflights users on 7/10. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/1512:12 pmIAD - OPO
2 stops15h 13mAir France
mar. 7/226:35 amOPO - IAD
1 stop17h 40mAir France
Deal found 7/10$638
This Delta deal was found by Cheapflights users on 7/8. 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.
lun. 9/228:17 pmIAD - OPO
2 stops14h 13mDelta
jue. 10/94:20 pmOPO - IAD
2 stops29h 16mDelta
Deal found 7/8$640
This SWISS deal was found by Cheapflights users on 7/10. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/238:45 pmIAD - OPO
1 stop30h 00mSWISS
mié. 10/87:50 pmOPO - IAD
2 stops25h 25mSWISS
Deal found 7/10$644
This Iberia deal was found by Cheapflights users on 7/9. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/254:35 pmIAD - OPO
1 stop10h 00mIberia
jue. 10/98:15 amOPO - IAD
1 stop11h 45mIberia
Deal found 7/9$654
This Ovago deal was found by Cheapflights users on 7/9. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/194:35 pmIAD - OPO
1 stop10h 00mBritish Airways
dom. 8/2412:20 pmOPO - IAD
1 stop31h 40mBritish Airways
Deal found 7/9$659
This Air Canada deal was found by Cheapflights users on 7/8. 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.
dom. 9/215:13 pmIAD - OPO
2 stops35h 22mAir Canada
vie. 10/1011:05 amOPO - IAD
2 stops29h 08mAir Canada
Deal found 7/8$666

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 julio 11, 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

dom. 9/21

6:10 pm-3:40 pm

1 stop16h 30m

Porto

jue. 10/9

6:15 am-3:50 pm

2 stops14h 35m

$625

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

vie. 8/22

10:20 pm-7:00 pm

1 stop15h 40m

Porto

vie. 8/29

8:50 am-3:20 pm

1 stop11h 30m

$629

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

jue. 8/21

5:53 pm-9:45 am

1 stop10h 52m

Porto

jue. 8/28

12:10 pm-11:55 am

2 stops28h 45m

$630

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

jue. 8/28

5:50 pm-4:05 pm

2 stops17h 15m

Porto

lun. 9/1

10:00 pm-8:50 pm

2 stops27h 50m

$631

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

lun. 9/22

8:17 pm-3:30 pm

2 stops14h 13m

Porto

mié. 10/8

8:10 pm-3:35 pm

1 stop24h 25m

$636

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 7/20

9:20 pm-9:35 pm

1 stop19h 15m

Porto

mar. 7/29

6:35 am-7:51 pm

2 stops18h 16m

$643

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mar. 9/23

8:45 pm-7:45 am

1 stop30h 00m

Porto

mié. 10/8

7:50 pm-4:15 pm

2 stops25h 25m

$644

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

jue. 9/25

4:35 pm-7:35 am

1 stop10h 00m

Porto

jue. 10/9

8:15 am-3:00 pm

1 stop11h 45m

$654

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

mar. 8/19

4:35 pm-7:35 am

1 stop10h 00m

Porto

dom. 8/24

12:20 pm-3:00 pm

1 stop31h 40m

$659

Washington, D.C.Porto

IAD - OPO

IADOPO

Washington, D.C. Dulles Intl

dom. 9/21

5:13 pm-9:35 am

2 stops35h 22m

Porto

vie. 10/10

11:05 am-11:13 am

2 stops29h 08m

$666

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

Showing 1-10 of 16 results
1
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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 27, 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 $1,032). 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 julio 11, 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.

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Porto?

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 julio 11, 2025.
Get a feel of what it's like to fly with Delta, KLM, and Air France from Washington, D.C. Dulles Intl Airport to Porto by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.0
Very good

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Overall

8.0

Boarding

8.2

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!
8.0
Very good
8.0
Very good

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Overall

8.0

Boarding

8.2

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!
8.0
Very good

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Overall

8.0

Boarding

8.2

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!
8.0
Very good

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Overall

8.0

Boarding

8.2

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!
8.0
Very good

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Overall

8.0

Boarding

8.2

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!
8.0
Very good

Entertainment

7.9

Crew

8.5

Comfort

7.9

Food

7.3

Overall

8.0

Boarding

8.2

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 8 different airlines.

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

    Currently priced at $625, Lufthansa will fly you from Washington, D.C. Dulles Intl Airport to Porto and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from TAP AIR PORTUGAL and United Airlines - these airlines can fly you to your destination from $629 and $630, respectively. These flights start at 12% 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?

    $258 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 Air Canada and United Airlines, with prices starting from $354 and $359, 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 $1,032). 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

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Top 8 airlines flying from Dulles Intl to Porto

Discover the top 8 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 julio 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$418Average$820FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$430Average$690FlexibilityNo cancel feeOn-time75%
TAP AIR PORTUGALCheapest$460Average$758FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$515Average$736FlexibilityNo cancel feeOn-time77%
SWISSCheapest$542Average$666FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$543Average$795FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$573Average$736FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$603Average$696FlexibilityNo cancel feeOn-time76%

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