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Portsmouth

$461+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheap 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 julio 31, 2025.

Round-trip from

$808
(KLM)

One-way from

$461
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$1,220
From Washington, D.C. Dulles Intl to Portsmouth
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One-way flight from Washington, D.C. Dulles Intl to Portsmouth
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Highest demand for flights based on searches. 22% potential increase in price ($279 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($50 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find 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 julio 31, 2025.

This KLM deal was found by Cheapflights users on 7/30. 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.
vie. 8/155:25 pmIAD - SOU
1 stop10h 20mKLM
sáb. 8/235:35 pmSOU - IAD
1 stop27h 00mKLM
Deal found 7/30$808
This Delta deal was found by Cheapflights users on 7/28. 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.
vie. 8/225:25 pmIAD - SOU
1 stop10h 20mDelta
sáb. 9/69:20 amSOU - IAD
2 stops19h 06mDelta
Deal found 7/28$824
This Gurufare deal was found by Cheapflights users on 7/28. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/135:20 pmIAD - SOU
1 stop10h 15mAer Lingus
sáb. 9/279:40 amSOU - IAD
1 stop11h 10mAer Lingus
Deal found 7/28$917
This Mytrip deal was found by Cheapflights users on 7/29. 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.
vie. 9/122:25 pmIAD - SOU
2 stops20h 20mMultiple Airlines
vie. 9/199:40 amSOU - IAD
3 stops28h 58mMultiple Airlines
Deal found 7/29$968
This British Airways deal was found by Cheapflights users on 7/29. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/125:55 pmIAD - SOU
2 stops13h 05mBritish Airways
mar. 8/199:10 amSOU - IAD
1 stop11h 40mBritish Airways
Deal found 7/29$2,081

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 julio 31, 2025.
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

Dulles Intl

Fly to

Portsmouth

Route

Depart

Return

Price

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 8/15

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

sáb. 8/23

5:35 pm-3:35 pm

1 stop27h 00m

$808

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 8/22

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

sáb. 9/6

9:20 am-11:26 pm

2 stops19h 06m

$824

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

sáb. 9/13

5:20 pm-8:35 am

1 stop10h 15m

Southampton Eastleigh

sáb. 9/27

9:40 am-3:50 pm

1 stop11h 10m

$917

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 9/12

2:25 pm-3:45 pm

2 stops20h 20m

Southampton Eastleigh

vie. 9/19

9:40 am-9:38 am

3 stops28h 58m

$968

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

mar. 8/12

5:55 pm-12:00 pm

2 stops13h 05m

Southampton Eastleigh

mar. 8/19

9:10 am-3:50 pm

1 stop11h 40m

$2,081

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 8/15

5:20 pm-8:40 am

1 stop10h 20m

$461

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 9/26

5:25 pm-8:45 am

1 stop10h 20m

$495

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 9/26

7:22 pm-5:30 pm

2 stops17h 08m

$500

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 8/15

8:25 pm-8:25 am

3 stops31h 00m

$519

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 month to book a flight from Washington, D.C. Dulles Intl Airport to Portsmouth?

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Portsmouth (average of $661). Flying from Washington, D.C. Dulles Intl Airport to Portsmouth in June is currently the most expensive (average of $1,097). 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 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 julio 31, 2025.

When flying from Washington, D.C. Dulles Intl Airport to Portsmouth, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Portsmouth?

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Portsmouth. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Portsmouth flight should consider departing on Sunday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 julio 31, 2025.

The most flights from IAD to P0R are scheduled on a Wednesday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 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 julio 31, 2025.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Portsmouth, such as Delta, KLM, and Aer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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!
Aer Lingus
7.1
Good
1,192 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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!
British Airways
6.6
Okay
7,222 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

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 Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at $461. KLM flights start at $495 while deals on Delta start at $500 one-way.

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

    Consider Aer Lingus (63%), Finnair (63%) or KLM (63%) 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 $3,937, our data shows the cheapest flight currently is $276. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $808 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.

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

    Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Portsmouth (average of $661). Flying from Washington, D.C. Dulles Intl Airport to Portsmouth in June is currently the most expensive (average of $1,097). 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

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Alternative routes for Dulles Intl to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Heathrow flights
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Baltimore to Luton flights
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Reagan-National to London City flights
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Dulles Intl to Manchester flights
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Dulles Intl to Newcastle upon Tyne flights
Reagan-National to Luton flights
Reagan-National to Manchester flights
Baltimore to Newcastle upon Tyne flights
Reagan-National to Newcastle upon Tyne flights
Dulles Intl to Birmingham flights
Dulles Intl to Southampton flights
Reagan-National to Birmingham flights
Baltimore to Birmingham flights
Dulles Intl to Bristol flights
Dulles Intl to Liverpool flights
Dulles Intl to Leeds flights
Baltimore to Liverpool flights
Baltimore to Bristol flights
Reagan-National to Leeds flights
Baltimore to Leeds flights
Baltimore to Southampton flights
Reagan-National to Bristol flights
Dulles Intl to Southend flights
Reagan-National to Liverpool flights
Dulles Intl to Newquay flights
Dulles Intl to Exeter flights
Reagan-National to Southampton flights
Dulles Intl to East Midlands flights
Baltimore to Exeter flights
Dulles Intl to Bournemouth flights
Baltimore to Doncaster flights
Baltimore to Newquay flights

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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest$313Average$511FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$409Average$598FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$433Average$621FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$441Average$690FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$447Average$755FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$549Average$759FlexibilityNo cancel feeOn-time67%
Aer LingusCheapest$557Average$836FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$569Average$794FlexibilityNo cancel feeOn-time70%
SWISSCheapest$572Average$806FlexibilityNo cancel feeOn-time79%
DeltaCheapest$572Average$968FlexibilityNo cancel feeOn-timeN/A

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