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Portsmouth

$377+ Cheap flights from Dulles Intl (IAD) to Portsmouth, England

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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
juil. 9 — juil. 161
jeu. 7/9
jeu. 7/16
1 adult, Economy
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Cheap flight deals from Dulles Intl to Portsmouth

Cheapest flights from Dulles Intl to Portsmouth
Explore the most affordable flight options available from Dulles Intl to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on juin 9, 2026.

This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
mar. 8/48:25 pm
IAD
-
SOU
2 stops31h 20m
Multiple Airlines
jeu. 8/209:20 am
SOU
-
IAD
1 stop11h 25m
Multiple Airlines
Deal found 6/4$930
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
mar. 8/45:15 pm
IAD
-
SOU
1 stop9h 50m
Aer Lingus
jeu. 8/209:20 am
SOU
-
IAD
1 stop11h 25m
Aer Lingus
Deal found 6/4$1,017
This Mytrip deal was found by Cheapflights users on 6/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 7/238:30 pm
IAD
-
SOU
2 stops18h 00m
Multiple Airlines
jeu. 7/309:20 am
SOU
-
IAD
2 stops15h 00m
Multiple Airlines
Deal found 6/8$1,031
This Mytrip deal was found by Cheapflights users on 6/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 7/228:30 pm
IAD
-
SOU
2 stops18h 00m
Multiple Airlines
mer. 7/298:00 pm
SOU
-
IAD
1 stop24h 45m
Multiple Airlines
Deal found 6/7$1,058
This Mytrip deal was found by Cheapflights users on 6/6. 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.
sam. 7/188:30 pm
IAD
-
SOU
2 stops18h 00m
Multiple Airlines
ven. 7/249:20 am
SOU
-
IAD
2 stops17h 55m
Multiple Airlines
Deal found 6/6$1,089

Find flight deals from Dulles Intl to Portsmouth

Keep the following information in mind while searching for Dulles Intl to Portsmouth flight deals. Data was last updated juin 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$930
(Kiwi.com)

One-way from

$377
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,121
Provider with most accurate pricing for Washington, D.C. (WAS)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-London (LON) flights.
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From Washington, D.C. Dulles Intl to Portsmouth
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Portsmouth
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($179 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Portsmouth 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 juin 9, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Portsmouth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

lun. 8/24

6:10 pm-5:35 pm

1 stop18h 25m

Southampton Eastleigh

lun. 9/7

5:20 pm-3:35 pm

1 stop27h 15m

$1,117

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

lun. 8/3

12:29 pm-8:45 am

2 stops15h 16m

Southampton Eastleigh

jeu. 8/20

6:05 pm-3:35 pm

1 stop26h 30m

$1,122
Quickest round-trip

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

dim. 8/2

5:40 pm-8:45 am

1 stop10h 05m

Southampton Eastleigh

mer. 8/19

9:15 am-11:26 pm

2 stops19h 11m

$1,127

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

lun. 8/24

12:29 pm-8:45 am

2 stops15h 16m

Southampton Eastleigh

lun. 9/7

9:05 am-11:20 pm

2 stops19h 15m

$1,182

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

mer. 8/12

5:15 pm-4:50 pm

1 stop18h 35m

Southampton Eastleigh

mar. 9/8

9:15 am-3:45 pm

1 stop11h 30m

$1,261
Cheapest one-way

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

mar. 11/3

7:40 pm-12:55 pm

2 stops12h 15m

$432

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

mar. 11/3

9:00 pm-8:40 am

1 stop30h 40m

$443

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

sam. 9/5

5:40 pm-8:45 am

1 stop10h 05m

$508

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

sam. 9/5

12:29 pm-8:45 am

2 stops15h 16m

$512
Quickest one-way

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

lun. 7/20

6:10 pm-8:45 am

1 stop9h 35m

$535

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/5

Showing 1-10 of 11 resultsSorted by cheapest first
1
2

Best time to book a flight from Dulles Intl to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth 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 Portsmouth

What is the cheapest time of day to fly from IAD to P0R?

Find hourly flight availability from Dulles Intl to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated juin 9, 2026.

One of the essential ways to save on airfare from Washington, D.C. Dulles Intl Airport to Portsmouth is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 50% on airfare.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Portsmouth

Explore weekly flight availability from Dulles Intl to Portsmouth. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated juin 9, 2026.

The most flights from IAD to P0R are scheduled on a Monday (28 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (28 on average).

Reviews of airlines servicing Portsmouth

Get insights into the airlines that provide service to Portsmouth. 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 Portsmouth. Reviews last updated juin 9, 2026.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Portsmouth, such as Aer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.3
Good
1,599 reviews

Crew

8.1

Food

6.7

Boarding

7.4

Comfort

7.2

Entertainment

7.0

Overall

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

SFO - DUB

The boarding went smoothly, the crew were great and helped me with an extra pillow, the food was good including complementary wine with dinner (economy seating), and I was able to sleep. The flight arrived early which helped with connections. Overall a great experience.
Aer Lingus
7.3
Good
1,599 reviews
Aer Lingus
7.3
Good
1,599 reviews

Crew

8.1

Food

6.7

Boarding

7.4

Comfort

7.2

Entertainment

7.0

Overall

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

SFO - DUB

The boarding went smoothly, the crew were great and helped me with an extra pillow, the food was good including complementary wine with dinner (economy seating), and I was able to sleep. The flight arrived early which helped with connections. Overall a great experience.

Related info for your journey

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

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Portsmouth?

    A quick flight from Washington, D.C. Dulles Intl Airport to Portsmouth can take about 9h 50m. Aer Lingus provides one of the quickest options available for as low as $1,017. There are 3639 mi between Washington, D.C. Dulles Intl Airport and Portsmouth.

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Portsmouth?

    Consider Aer Lingus (82%), Finnair (82%) or Iberia (82%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Portsmouth.

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Portsmouth?

    While on average a flight from Washington, D.C. Dulles Intl Airport to Portsmouth is generally $2,353, our data shows the cheapest flight currently is $364. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $1,103 for that flight.

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

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

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

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

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

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

See more FAQs

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Top 10 airlines flying from Dulles Intl to Portsmouth

Discover the top 10 airlines that operate flights from Dulles Intl to Portsmouth. 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 juin 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$309Average$507FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$489Average$664FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$492Average$771FlexibilityNo cancel feeOn-time77%
DeltaCheapest$519Average$883FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$527Average$761FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$540Average$810FlexibilityNo cancel feeOn-time71%
Virgin AtlanticCheapest$541Average$875FlexibilityNo cancel feeOn-time72%
Aer LingusCheapest$554Average$937FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$557Average$878FlexibilityNo cancel feeOn-time69%
IberiaCheapest$565Average$710FlexibilityNo cancel feeOn-time77%

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