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Portsmouth

$494+ 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 9/26. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LHR
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$795
(Ticket)

One-way from

$494
(KLM)

Popular in

June

Cheapest in

September

Average price

$636
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. 11% potential increase in price ($98 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 16, 2025.

This Ticket deal was found by Cheapflights users on 9/15. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/15:25 pmIAD - SOU
1 stop18h 35mKLM
Sun 10/56:25 pmSOU - IAD
1 stop26h 10mKLM
Deal found 9/15$795
This Delta deal was found by Cheapflights users on 9/15. 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.
Sun 9/285:25 pmIAD - SOU
1 stop10h 20mDelta
Tue 10/149:20 amSOU - IAD
1 stop11h 15mDelta
Deal found 9/15$812
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 10/110:07 amIAD - SOU
2 stops17h 38mDelta
Sun 10/56:25 pmSOU - IAD
1 stop26h 10mDelta
Deal found 9/15$814
This Delta deal was found by Cheapflights users on 9/15. 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.
Sun 9/286:15 amIAD - SOU
2 stops21h 30mDelta
Wed 10/155:35 pmSOU - IAD
1 stop27h 00mDelta
Deal found 9/15$816
This Delta deal was found by Cheapflights users on 9/15. 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.
Thu 10/25:25 pmIAD - SOU
1 stop10h 20mDelta
Tue 10/145:35 pmSOU - IAD
2 stops30h 43mDelta
Deal found 9/15$822
This Delta deal was found by Cheapflights users on 9/14. 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.
Wed 10/2912:27 pmIAD - SOU
2 stops15h 53mDelta
Wed 11/58:40 amSOU - IAD
2 stops19h 20mDelta
Deal found 9/14$826
This Delta deal was found by Cheapflights users on 9/15. 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.
Sun 9/285:25 pmIAD - SOU
1 stop10h 20mDelta
Sun 10/126:25 pmSOU - IAD
1 stop26h 10mDelta
Deal found 9/15$887
This Mytrip deal was found by Cheapflights users on 9/15. 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 10/111:15 pmIAD - SOU
2 stops15h 15mMultiple Airlines
Sun 10/56:25 pmSOU - IAD
3 stops29h 55mMultiple Airlines
Deal found 9/15$900
This Delta deal was found by Cheapflights users on 9/15. 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.
Sun 9/285:25 pmIAD - SOU
1 stop10h 20mDelta
Fri 10/175:35 pmSOU - IAD
1 stop27h 00mDelta
Deal found 9/15$937
This KLM deal was found by Cheapflights users on 9/14. 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.
Mon 9/157:22 pmIAD - SOU
2 stops16h 38mKLM
Mon 9/225:35 pmSOU - IAD
1 stop27h 00mKLM
Deal found 9/14$941

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 September 16, 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

Fri 10/3

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Thu 10/16

9:20 am-3:35 pm

1 stop11h 15m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/29

7:05 pm-5:25 pm

1 stop18h 20m

Southampton Eastleigh

Wed 11/5

5:30 pm-4:05 pm

1 stop27h 35m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Mon 9/29

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Thu 10/16

9:20 am-3:35 pm

1 stop11h 15m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sun 9/28

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Mon 10/13

5:35 pm-3:35 pm

1 stop27h 00m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Wed 10/1

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Tue 10/14

5:35 pm-3:35 pm

1 stop27h 00m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Fri 10/3

5:25 pm-5:30 pm

1 stop19h 05m

Southampton Eastleigh

Tue 10/14

9:20 am-3:35 pm

1 stop11h 15m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Tue 9/30

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Thu 10/16

9:20 am-3:35 pm

1 stop11h 15m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Mon 9/29

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Tue 10/14

5:35 pm-3:35 pm

1 stop27h 00m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sun 9/28

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Wed 10/15

5:35 pm-3:35 pm

1 stop27h 00m

$812

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 10/2

5:25 pm-8:45 am

1 stop10h 20m

Southampton Eastleigh

Thu 10/16

9:20 am-3:35 pm

1 stop11h 15m

$812

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 16 results
1
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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 September 16, 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 September 16, 2025.

The most flights from IAD to P0R are scheduled on a Monday (28 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (20 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 September 16, 2025.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Portsmouth, such as Delta 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
7,957 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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
7,957 reviews
Delta
8.0
Very good
7,957 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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
7.2
Good
1,274 reviews
Delta
8.0
Very good
7,957 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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.

  • 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 10h 20m. Delta provides one of the quickest options available for as low as $812. There are 3639 mi between Washington, D.C. Dulles Intl Airport and Portsmouth. This flight may include one or multiple stops.

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

    Consider Aeromexico (100%), KLM (80%) or Air France (80%) 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 $1,998, our data shows the cheapest flight currently is $347. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $795 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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Reagan-National to London City flights
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Dulles Intl to Manchester flights
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Reagan-National to Manchester flights
Reagan-National to Stansted flights
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Dulles Intl to Birmingham flights
Reagan-National to Birmingham flights
Baltimore to Birmingham flights
Dulles Intl to Liverpool flights
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Reagan-National to Luton flights
Baltimore to Leeds flights
Baltimore to Newcastle upon Tyne flights
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Reagan-National to Newcastle upon Tyne flights
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Dulles Intl to Southend flights
Baltimore to Bristol flights
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Baltimore to Southampton flights
Dulles Intl to Newquay flights
Baltimore to Southend flights
Baltimore to Exeter flights
Dulles Intl to East Midlands flights
Reagan-National to East Midlands flights
Baltimore to East Midlands 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest$313Average$470FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$424Average$597FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$433Average$632FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$441Average$601FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$447Average$812FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$547Average$780FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$549Average$759FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$563Average$796FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$564Average$816FlexibilityNo cancel feeOn-time72%
DeltaCheapest$566Average$959FlexibilityNo cancel feeOn-timeN/A

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