$300+ 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 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — OPO
Oct 7 — Oct 141
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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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 September 7, 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 September 7, 2026.
This Mytrip deal was found by Cheapflights users on 9/2. 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 10/149:55 am -
2 stops19h 15m
Wed 10/2110:00 am -
3 stops34h 00m
Deal found 9/2![Multiple Airlines logo]()
$677
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/55:40 pm -
1 stop10h 20m
Fri 10/165:05 am -
1 stop14h 20m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$678
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Thu 10/1510:35 pm -
1 stop15h 20m
Mon 10/266:00 pm -
1 stop25h 45m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$683
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/1610:50 pm -
1 stop10h 40m
Mon 10/266:00 pm -
1 stop25h 45m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$688
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/125:40 pm -
1 stop10h 20m
Wed 10/288:00 pm -
1 stop24h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$689
This Mytrip deal was found by Cheapflights users on 9/5. 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.
Tue 10/208:30 pm -
3 stops30h 30m
Tue 10/279:55 pm -
3 stops25h 35m
Deal found 9/5![Multiple Airlines logo]()
$692
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/1610:50 pm -
1 stop10h 40m
Wed 10/284:00 pm -
1 stop28h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$698
This Delta deal was found by Cheapflights users on 9/6. 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 9/6![Delta logo]()
$702
This Gotogate deal was found by Cheapflights users on 9/6. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/24:30 pm -
2 stops17h 50m
Mon 11/231:45 pm -
1 stop35h 20m
Deal found 9/6![Multiple Airlines logo]()
$704
This Justfly.com deal was found by Cheapflights users on 9/3. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:35 pm -
1 stop11h 25m
Thu 10/295:00 am -
1 stop15h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$706
This Mytrip deal was found by Cheapflights users on 9/6. 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.
Tue 10/138:30 pm -
2 stops22h 25m
Tue 10/2010:00 pm -
3 stops29h 15m
Deal found 9/6![Multiple Airlines logo]()
$710
This FlightHub deal was found by Cheapflights users on 9/3. 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 10/1510:35 pm -
1 stop11h 25m
Wed 10/288:00 pm -
1 stop24h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$711
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 September 7, 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 September 7, 2026.
This Delta deal was found by Cheapflights users on 9/5. 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 9/5![Delta logo]()
$702
This United Airlines deal was found by Cheapflights users on 9/4. 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 10/1910:25 pm -
2 stops27h 35m
Mon 11/1612:30 pm -
1 stop32h 25m
Deal found 9/4![United Airlines logo]()
$720
This United deal was found by Cheapflights users on 9/5. 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.
Tue 11/248:37 am -
1 stop19h 53m
Mon 11/3012:05 pm -
1 stop33h 55m
Deal found 9/5![Multiple Airlines logo]()
$776
This Lufthansa deal was found by Cheapflights users on 9/4. 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.
Thu 2/186:00 pm -
2 stops13h 50m
Tue 2/236:00 am -
1 stop14h 55m
Deal found 9/4![Lufthansa logo]()
$826
This SWISS deal was found by Cheapflights users on 9/6. 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.
Thu 10/88:20 pm -
2 stops17h 50m
Wed 10/1412:15 pm -
1 stop33h 30m
Deal found 9/6![SWISS logo]()
$885
This United deal was found by Cheapflights users on 9/4. 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 1/165:29 pm -
2 stops40h 51m
Sat 1/2312:05 pm -
1 stop33h 55m
Deal found 9/4![Multiple Airlines logo]()
$779
This Delta deal was found by Cheapflights users on 9/2. 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 10/612:30 pm -
2 stops21h 55m
Tue 10/135:00 am -
1 stop15h 35m
Deal found 9/2![Delta logo]()
$857
Last-minute flights from Dulles Intl to PortoDiscover last-minute flight deals from Dulles Intl to Porto. Data last updated September 7, 2026 and is based on user searches.
Discover last-minute flight deals from Dulles Intl to Porto. Data last updated September 7, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/55:40 pm -
1 stop10h 20m
Fri 10/165:05 am -
1 stop14h 20m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$678
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/125:40 pm -
1 stop10h 20m
Wed 10/288:00 pm -
1 stop24h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$689
This Mytrip deal was found by Cheapflights users on 9/6. 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.
Tue 10/138:30 pm -
2 stops22h 25m
Tue 10/2010:00 pm -
3 stops29h 15m
Deal found 9/6![Multiple Airlines logo]()
$710
This Mytrip deal was found by Cheapflights users on 9/2. 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 10/149:55 am -
2 stops19h 15m
Wed 10/2110:00 am -
3 stops34h 00m
Deal found 9/2![Multiple Airlines logo]()
$677
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Thu 10/1510:35 pm -
1 stop15h 20m
Mon 10/266:00 pm -
1 stop25h 45m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$683
This Justfly.com deal was found by Cheapflights users on 9/3. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:35 pm -
1 stop11h 25m
Thu 10/295:00 am -
1 stop15h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$706
This FlightHub deal was found by Cheapflights users on 9/3. 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 10/1510:35 pm -
1 stop11h 25m
Wed 10/288:00 pm -
1 stop24h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$711
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/1610:50 pm -
1 stop10h 40m
Mon 10/266:00 pm -
1 stop25h 45m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$688
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/1610:50 pm -
1 stop10h 40m
Wed 10/284:00 pm -
1 stop28h 15m
Deal found 9/3![TAP AIR PORTUGAL logo]()
$698
This United Airlines deal was found by Cheapflights users on 9/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1910:25 pm -
2 stops27h 35m
Mon 11/1612:30 pm -
1 stop32h 25m
Deal found 9/7![United Airlines logo]()
$720
This Mytrip deal was found by Cheapflights users on 9/5. 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.
Tue 10/208:30 pm -
3 stops30h 30m
Tue 10/279:55 pm -
3 stops25h 35m
Deal found 9/5![Multiple Airlines logo]()
$692
This Mytrip deal was found by Cheapflights users on 9/6. 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 10/2110:35 pm -
2 stops20h 15m
Wed 10/282:20 pm -
2 stops29h 55m
Deal found 9/6![Multiple Airlines logo]()
$718
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 September 7, 2026.
Search for one-way flight options from Dulles Intl to Porto. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/198:30 pm -
3 stops31h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Multiple Airlines logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 9/4. 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.
Thu 10/298:40 pm -
3 stops44h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$306
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 12/17:40 pm -
3 stops34h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Multiple Airlines logo]()
$330
This Expedia deal was found by Cheapflights users on 9/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2710:55 pm -
1 stop20h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Lufthansa logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 9/2. 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.
Thu 9/243:50 pm -
3 stops48h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Multiple Airlines logo]()
$343
This United Airlines deal was found by Cheapflights users on 9/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/285:29 pm -
1 stop11h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![United Airlines logo]()
$346
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Sat 10/178:30 pm -
3 stops44h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Multiple Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 9/4. 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 11/1810:30 pm -
3 stops44h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$353
This Kiwi.com deal was found by Cheapflights users on 9/6. 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.
Thu 10/111:12 am -
3 stops38h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Multiple Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 9/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2610:44 pm -
1 stop29h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![United Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Sun 2/2812:45 pm -
2 stops21h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![United Airlines logo]()
$366
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 September 7, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $670 (FlightHub) |
One-way from | $300 (Kiwi.com) |
Popular in | May |
Cheapest in | January |
Average price | $813 |
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 September 7, 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
Tue 12/1
7:40 pm-11:25 am
3 stops34h 45m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$330
Quickest round-trip
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Sun 12/27
10:55 pm-12:00 am
1 stop20h 05m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$339
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Thu 10/1
11:12 am-6:50 am
3 stops38h 38m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$354
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
$357
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Sun 2/28
12:45 pm-3:20 pm
2 stops21h 35m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$366
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Mon 12/14
8:15 am-9:30 am
1 stop20h 15m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$376
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Thu 12/31
8:25 am-9:30 am
1 stop20h 05m
Porto
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$396
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Tue 12/8
12:35 pm-10:35 am
2 stops17h 00m
Porto
Wed 12/16
5:00 am-3:55 pm
1 stop15h 55m
$702
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Mon 10/19
10:25 pm-7:00 am
2 stops27h 35m
Porto
Mon 11/16
12:30 pm-3:55 pm
1 stop32h 25m
$720
Washington, D.C.Porto
IAD Washington, D.C. Dulles Intl - OPO Porto
IADOPO
Washington, D.C. Dulles Intl
Tue 11/24
8:37 am-9:30 am
1 stop19h 53m
Porto
Mon 11/30
12:05 pm-5:00 pm
1 stop33h 55m
$776
Showing 1-10 of 14 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 September.
| 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
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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 $613). Flying from Washington, D.C. Dulles Intl Airport to Porto in May is currently the most expensive (average of $1,227). 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 $802 and $1,310 in October.The cheapest round-trip price found within the last 5 days was $670 on TAP AIR PORTUGAL (Oct 23-Oct 31).
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 September 7, 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.
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Overall
7.8
Food
7.3
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Overall
7.8
Food
7.3
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Overall
7.8
Food
7.3
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Overall
7.8
Food
7.3
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Overall
7.8
Food
7.3
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Entertainment
7.2
Boarding
7.8
Comfort
7.7
Overall
7.8
Food
7.3
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - 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 September 7, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$477 | Average$1,021 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$480 | Average$1,024 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$498 | Average$806 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$514 | Average$724 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$533 | Average$1,228 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$642 | Average$1,310 | FlexibilityNo cancel fee | On-time77% |