$212+ Cheap flights from Dulles Intl (IAD) to Porto (OPO)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/26. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — OPO
Nov 24 — Dec 11
Round-trip
1 adult, Economy
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Find cheap flights from Dulles Intl to Porto with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Dulles Intl to Porto
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One-way
Cheapest flights from Dulles Intl to PortoExplore 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 October 25, 2026.
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 October 25, 2026.
This Mytrip deal was found by Cheapflights users on 10/24. 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.
Thu 11/265:25 pm -
2 stops23h 35m
Wed 12/211:35 am -
2 stops32h 40m
Deal found 10/24![Multiple Airlines logo]()
$589
This Booking.com deal was found by Cheapflights users on 10/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/55:25 pm -
1 stop16h 35m
Sat 12/124:00 pm -
1 stop33h 35m
Deal found 10/21![TAP AIR PORTUGAL logo]()
$590
This oojo deal was found by Cheapflights users on 10/24. 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.
Thu 11/265:25 pm -
1 stop15h 05m
Wed 12/28:00 pm -
1 stop24h 15m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$592
This Cheapflightsfares deal was found by Cheapflights users on 10/21. 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.
Sun 12/610:30 pm -
1 stop18h 30m
Sun 12/1311:00 am -
1 stop14h 35m
Deal found 10/21![TAP AIR PORTUGAL logo]()
$593
This Booking.com deal was found by Cheapflights users on 10/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1110:30 pm -
2 stops19h 30m
Mon 11/162:15 pm -
2 stops29h 25m
Deal found 10/21![Multiple Airlines logo]()
$596
This FlightHub deal was found by Cheapflights users on 10/24. 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.
Tue 12/15:25 pm -
1 stop11h 35m
Tue 12/87:00 am -
1 stop12h 40m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$597
This Mytrip deal was found by Cheapflights users on 10/21. 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.
Wed 12/29:05 am -
2 stops20h 45m
Wed 12/96:25 am -
2 stops18h 58m
Deal found 10/21![Multiple Airlines logo]()
$599
This Kiwi.com deal was found by Cheapflights users on 10/24. 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.
Fri 12/410:30 pm -
1 stop10h 00m
Thu 12/108:30 am -
1 stop11h 45m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$601
This Mytrip deal was found by Cheapflights users on 10/21. 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.
Mon 11/99:55 am -
3 stops33h 35m
Sun 11/152:30 pm -
3 stops31h 30m
Deal found 10/21![Multiple Airlines logo]()
$604
This Kiwi.com deal was found by Cheapflights users on 10/24. 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 11/305:25 pm -
1 stop16h 35m
Wed 12/96:25 am -
2 stops17h 40m
Deal found 10/24![Multiple Airlines logo]()
$605
This Kiwi.com deal was found by Cheapflights users on 10/24. 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.
Wed 12/210:30 pm -
1 stop10h 00m
Mon 12/77:00 am -
1 stop13h 15m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$606
This Kiwi.com deal was found by Cheapflights users on 10/24. 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 12/15:25 pm -
1 stop11h 35m
Sun 12/612:00 pm -
1 stop13h 35m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$607
Best flights from Dulles Intl to PortoDiscover carefully curated flight deals from Dulles Intl to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.
Discover carefully curated flight deals from Dulles Intl to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.
This TAP AIR PORTUGAL deal was found by Cheapflights users on 10/21. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/105:25 pm -
1 stop16h 35m
Mon 11/166:00 pm -
1 stop25h 40m
Deal found 10/21![TAP AIR PORTUGAL logo]()
$693
This United deal was found by Cheapflights users on 10/23. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/18:37 am -
1 stop19h 53m
Tue 3/306:20 am -
2 stops42h 55m
Deal found 10/23![Multiple Airlines logo]()
$719
This United Airlines deal was found by Cheapflights users on 10/24. 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.
Wed 12/98:35 am -
1 stop19h 55m
Wed 12/166:00 am -
1 stop14h 55m
Deal found 10/24![United Airlines logo]()
$724
This Delta deal was found by Cheapflights users on 10/20. 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.
Tue 12/812:35 pm -
2 stops17h 00m
Wed 12/165:00 am -
1 stop15h 55m
Deal found 10/20![Delta logo]()
$725
This SWISS deal was found by Cheapflights users on 10/21. 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.
Tue 12/298:10 pm -
1 stop34h 05m
Wed 1/67:20 pm -
1 stop26h 40m
Deal found 10/21![SWISS logo]()
$806
This United deal was found by Cheapflights users on 10/23. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2010:10 pm -
1 stop31h 20m
Thu 3/256:00 am -
1 stop13h 35m
Deal found 10/23![Multiple Airlines logo]()
$729
This United Airlines deal was found by Cheapflights users on 10/23. 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 12/712:38 pm -
1 stop15h 52m
Mon 12/1412:30 pm -
1 stop32h 25m
Deal found 10/23![United Airlines logo]()
$756
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Thu 4/225:20 pm -
1 stop11h 25m
Tue 5/116:00 am -
1 stop14h 05m
Deal found 10/22![United Airlines logo]()
$819
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Fri 4/238:15 am -
1 stop20h 30m
Wed 5/126:00 am -
1 stop14h 05m
Deal found 10/22![United Airlines logo]()
$819
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Fri 4/238:15 am -
1 stop20h 30m
Tue 5/116:00 am -
1 stop14h 05m
Deal found 10/22![United Airlines logo]()
$819
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Thu 4/225:20 pm -
1 stop11h 25m
Thu 5/66:00 am -
1 stop14h 05m
Deal found 10/22![United Airlines logo]()
$819
Last-minute flights from Dulles Intl to PortoDiscover last-minute flight deals from Dulles Intl to Porto. Data last updated October 25, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Porto. Data last updated October 25, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 10/22. 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.
Fri 11/610:55 pm -
2 stops18h 05m
Sun 11/152:30 pm -
3 stops31h 30m
Deal found 10/22![Multiple Airlines logo]()
$644
This Mytrip deal was found by Cheapflights users on 10/21. 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.
Mon 11/99:55 am -
2 stops18h 45m
Sun 11/1511:00 pm -
2 stops23h 00m
Deal found 10/21![Multiple Airlines logo]()
$593
This Booking.com deal was found by Cheapflights users on 10/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1110:30 pm -
2 stops19h 30m
Mon 11/162:15 pm -
2 stops29h 25m
Deal found 10/21![Multiple Airlines logo]()
$596
This Mytrip deal was found by Cheapflights users on 10/24. 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.
Thu 11/265:25 pm -
2 stops23h 35m
Wed 12/211:35 am -
2 stops32h 40m
Deal found 10/24![Multiple Airlines logo]()
$589
This oojo deal was found by Cheapflights users on 10/24. 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.
Thu 11/265:25 pm -
1 stop15h 05m
Wed 12/28:00 pm -
1 stop24h 15m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$592
This Kiwi.com deal was found by Cheapflights users on 10/24. 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.
Sun 11/2910:30 pm -
1 stop10h 00m
Sun 12/65:00 am -
1 stop20h 35m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$610
This Kiwi.com deal was found by Cheapflights users on 10/24. 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 11/305:25 pm -
1 stop16h 35m
Wed 12/96:25 am -
2 stops17h 40m
Deal found 10/24![Multiple Airlines logo]()
$605
This Kiwi.com deal was found by Cheapflights users on 10/24. 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 11/305:25 pm -
1 stop11h 35m
Tue 12/85:00 am -
1 stop14h 40m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$608
This Kiwi.com deal was found by Cheapflights users on 10/24. 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 11/305:25 pm -
1 stop11h 35m
Sat 12/1211:15 am -
1 stop12h 50m
Deal found 10/24![Multiple Airlines logo]()
$641
This Kiwi.com deal was found by Cheapflights users on 10/24. 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 11/305:25 pm -
1 stop11h 35m
Mon 12/77:55 pm -
2 stops23h 45m
Deal found 10/24![Multiple Airlines logo]()
$643
One-way flights from Dulles Intl to PortoSearch for one-way flight options from Dulles Intl to Porto. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.
Search for one-way flight options from Dulles Intl to Porto. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.
This Booking.com deal was found by Cheapflights users on 10/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/265:25 pm -
1 stop16h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![TAP AIR PORTUGAL logo]()
$212
This Booking.com deal was found by Cheapflights users on 10/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/95:25 pm -
1 stop11h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![TAP AIR PORTUGAL logo]()
$213
This FlightHub deal was found by Cheapflights users on 10/20. 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.
Sat 11/145:25 pm -
1 stop15h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![TAP AIR PORTUGAL logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 11/95:25 pm -
2 stops20h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Multiple Airlines logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 11/305:25 pm -
2 stops32h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Multiple Airlines logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 12/15:25 pm -
3 stops37h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Multiple Airlines logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 10/19. 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.
Fri 1/1510:30 pm -
3 stops42h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Multiple Airlines logo]()
$356
Find 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 October 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $589 (Mytrip) |
One-way from | $212 (Booking.com) |
Popular in | May |
Cheapest in | January |
Average price | $833 |
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 7,457,451 searches. Data last updated October 25, 2026.
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
Fly to
Route
Depart
Return
Cheapest round-trip
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Thu 11/26
5:25 pm-3:00 pm
1 stop16h 35m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$212
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Mon 4/19
6:15 pm-3:25 pm
1 stop16h 10m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$334
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Mon 4/19
9:19 am-7:40 am
2 stops17h 21m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$344
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Thu 3/11
7:40 pm-7:00 pm
3 stops18h 20m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$471
Quickest round-trip
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Sun 11/1
6:40 pm-10:35 am
1 stop10h 55m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$496
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Sat 12/26
10:44 pm-9:30 am
1 stop29h 46m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$514
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Sun 11/1
10:10 pm-3:25 pm
2 stops36h 15m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$519
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Fri 10/30
11:30 pm-12:30 am
1 stop21h 00m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$529
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Sun 11/1
10:55 pm-10:25 pm
2 stops18h 30m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$536
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Tue 11/10
5:25 pm-3:00 pm
1 stop16h 35m
Porto
Mon 11/16
6:00 pm-2:40 pm
1 stop25h 40m
$693
Showing 1-10 of 20 resultsSorted by cheapest first
Compare providers for flights from Dulles Intl to Porto
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Porto in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Porto flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Porto flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
IAD-OPO
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
Prices
More
How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Porto?
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 23 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 $585). Flying from Washington, D.C. Dulles Intl Airport to Porto in May is currently the most expensive (average of $1,218). 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.
How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Porto?
Airfare is below average for this route at the moment.
Washington, D.C. Dulles Intl Airport to Porto flights typically cost between $670 and $1,158 in November.The cheapest round-trip price found within the last 5 days was $589 on Multiple Airlines (Nov 26-Dec 2).
What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to Porto?
Share of 1-stop round-trip flights from Washington, D.C. Dulles Intl Airport to Porto chosen by Cheapflights users in the past 12 months, using the same layover each way.
Lisbon (LIS) – chosen by Cheapflights users on 50% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to Porto on Cheapflights.
What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to Porto?
Average round-trip fare for 1-stop flights from Washington, D.C. Dulles Intl Airport to Porto, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Istanbul (IST) is the most affordable 1-stop option, with an average round-trip price of $608.
What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to Porto?
Shortest average travel time for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to Porto, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Lisbon (LIS) have the shortest average one-way travel time for 1-stop routes: 13h 25m.
Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to Porto?
Average layover duration for 1-stop one-way flights from Washington, D.C. Dulles Intl Airport to Porto, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Lisbon (LIS) offer the fastest connection on this route, with an average layover time of 4h 43m.
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 October 25, 2026.
Get a feel of what it's like to fly with KLM,Delta, andUnited Airlines 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.
Overall
7.8
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Food
7.4
Reviews
1 / 20
2.0
MediocreArtem,Oct 2026
FCO - AMS
Overall
7.8
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Food
7.4
Reviews
1 / 20
2.0
MediocreArtem,Oct 2026
FCO - AMS
Overall
7.8
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Food
7.4
Reviews
1 / 20
2.0
MediocreArtem,Oct 2026
FCO - AMS
Overall
7.8
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Food
7.4
Reviews
1 / 20
2.0
MediocreArtem,Oct 2026
FCO - AMS
Overall
7.8
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Food
7.4
Reviews
1 / 20
2.0
MediocreArtem,Oct 2026
FCO - AMS
Overall
7.8
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Food
7.4
Reviews
1 / 20
2.0
MediocreArtem,Oct 2026
FCO - AMS
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.
Traveling to a place near Porto?
Book flights to Porto if you plan to visit one of these locationsVila Nova de Gaia
Arcos de Valdevez
Coimbra
Aveiro
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Dulles Intl and Porto flights
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Top 6 airlines flying from Dulles Intl to Porto
Discover the top 6 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 7,457,451 searches. Data last updated October 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$477 | Average$1,182 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$504 | Average$812 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$514 | Average$724 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$641 | Average$1,088 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$642 | Average$1,310 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$692 | Average$1,288 | FlexibilityNo cancel fee | On-timeN/A |