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 17h 55m. KLM provides one of the quickest options available for as low as $766. There are 3639 mi between Washington, D.C. Dulles Intl Airport and Portsmouth. This flight may include one or multiple stops.

In terms of precipitation, rainfall in Portsmouth ranges from 1.0 - 3.0 inches per month. December is typically the wettest month, when rainfall can reach 3.0 in. July is typically the driest time to visit Portsmouth when rainfall is around 1.0 in.

If weather is an important factor for your trip to Portsmouth, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 64.4 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 39.2 F).

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 $2,133, our data shows the cheapest flight currently is $350. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $766 for that flight.

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

Consider KLM (95%), Air France (92%) or Delta (92%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Portsmouth.

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.

$468+ Flights from Washington, D.C. Dulles Intl Airport to Portsmouth

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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 December 18, 2025.

Mon 12/296:05 pmIAD - SOU

1 stop17h 55mKLM

Sun 1/115:45 pmSOU - IAD

2 stops30h 24mKLM

Deal found 12/16

$766

Mon 12/296:05 pmIAD - SOU

1 stop17h 55mMultiple Airlines

Sun 1/115:45 pmSOU - IAD

1 stop27h 20mMultiple Airlines

Deal found 12/16

$933

Mon 12/294:55 pmIAD - SOU

2 stops19h 05mDelta

Sun 1/115:45 pmSOU - IAD

2 stops30h 24mDelta

Deal found 12/16

$999

Thu 12/189:00 pmIAD - SOU

1 stop13h 35mBritish Airways

Tue 12/307:55 pmSOU - IAD

2 stops29h 00mBritish Airways

Deal found 12/15

$4,072

Wed 12/175:05 pmIAD - SOU

1 stop10h 40mBritish Airways

Tue 12/237:55 pmSOU - IAD

2 stops24h 40mBritish Airways

Deal found 12/16

$4,076

Best flights from Dulles Intl to Portsmouth
Discover carefully curated flight deals from Dulles Intl to Portsmouth that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2025.

Mon 12/296:05 pmIAD - SOU

1 stop17h 55mKLM

Sun 1/115:45 pmSOU - IAD

2 stops30h 24mKLM

Deal found 12/16

$766

Sat 1/315:27 pmIAD - SOU

2 stops18h 48mDelta

Sat 2/79:25 amSOU - IAD

1 stop11h 40mDelta

Deal found 12/17

$772

Thu 1/297:40 pmIAD - SOU

2 stops16h 30mMultiple Airlines

Thu 2/58:10 pmSOU - IAD

3 stops29h 50mMultiple Airlines

Deal found 12/15

$788

Fri 1/3012:32 pmIAD - SOU

2 stops15h 13mKLM

Fri 2/65:35 pmSOU - IAD

1 stop27h 30mKLM

Deal found 12/16

$772

Fri 1/3011:35 amIAD - SOU

3 stops22h 15mMultiple Airlines

Fri 2/67:50 pmSOU - IAD

2 stops24h 25mMultiple Airlines

Deal found 12/16

$842

Thu 1/2912:32 pmIAD - SOU

2 stops14h 53mKLM

Thu 2/59:00 amSOU - IAD

1 stop12h 05mKLM

Deal found 12/15

$772

Sun 5/175:40 pmIAD - SOU

1 stop9h 55mDelta

Sat 5/309:15 amSOU - IAD

1 stop11h 20mDelta

Deal found 12/17

$918

Mon 5/186:10 pmIAD - SOU

1 stop9h 25mDelta

Sun 5/319:15 amSOU - IAD

1 stop11h 20mDelta

Deal found 12/17

$918

Last-minute flights from Dulles Intl to Portsmouth
Discover last-minute flight deals from Dulles Intl to Portsmouth. Data last updated December 18, 2025 and is based on user searches.

Mon 12/296:05 pmIAD - SOU

1 stop17h 55mKLM

Sun 1/115:45 pmSOU - IAD

2 stops30h 24mKLM

Deal found 12/16

$766

Mon 12/296:05 pmIAD - SOU

1 stop17h 55mMultiple Airlines

Sun 1/115:45 pmSOU - IAD

1 stop27h 20mMultiple Airlines

Deal found 12/16

$933

Mon 12/294:55 pmIAD - SOU

2 stops19h 05mDelta

Sun 1/115:45 pmSOU - IAD

2 stops30h 24mDelta

Deal found 12/16

$999

Tue 1/135:05 pmIAD - SOU

1 stop13h 50mAer Lingus

Sun 1/188:10 pmSOU - IAD

1 stop24h 25mAer Lingus

Deal found 12/16

$1,003

Thu 1/296:05 pmIAD - SOU

1 stop18h 00mKLM

Thu 2/59:00 amSOU - IAD

1 stop12h 05mKLM

Deal found 12/15

$768

Thu 1/297:40 pmIAD - SOU

2 stops16h 30mMultiple Airlines

Thu 2/58:10 pmSOU - IAD

3 stops29h 50mMultiple Airlines

Deal found 12/15

$788

Fri 1/3012:32 pmIAD - SOU

2 stops15h 13mKLM

Fri 2/69:00 amSOU - IAD

2 stops19h 06mKLM

Deal found 12/16

$783

Fri 1/3011:35 amIAD - SOU

3 stops22h 15mMultiple Airlines

Fri 2/67:50 pmSOU - IAD

2 stops24h 25mMultiple Airlines

Deal found 12/16

$842

One-way flights from Dulles Intl to Portsmouth
Search for one-way flight options from Dulles Intl to Portsmouth. Find affordable one-way fares based on user searches. Data last updated December 18, 2025.

Sun 1/186:05 pmIAD - SOU

1 stop9h 45mDelta

Deal found 12/17

$468

Mon 6/16:10 pmIAD - SOU

1 stop9h 25mKLM

Deal found 12/15

$499

Sun 1/48:45 pmIAD - SOU

3 stops37h 05mMultiple Airlines

Deal found 12/17

$541

Sun 1/45:05 pmIAD - SOU

1 stop10h 40mAer Lingus

Deal found 12/17

$810

Mon 1/195:05 pmIAD - SOU

1 stop13h 50mAer Lingus

Deal found 12/17

$4,018

Fri 5/18:25 pmIAD - SOU

1 stop15h 10mAer Lingus

Deal found 12/15

$4,663

Tue 12/234:30 pmIAD - SOU

2 stops14h 25mMultiple Airlines

Deal found 12/15

$5,683

Fri 5/15:50 pmIAD - SOU

2 stops18h 00mMultiple Airlines

Deal found 12/15

$14,132

Find flight deals from Dulles Intl to Portsmouth

Most accurate provider	Gotogate 3 stars
Most trusted provider	Gotogate 3 stars
Round-trip from	$766 (KLM)
One-way from	$468 (Delta)
Popular in	December
Cheapest in	September
Average price	$978

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

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One-way flight from Washington, D.C. Dulles Intl to Portsmouth

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($51 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

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

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Mon 12/29

6:05 pm-5:00 pm

1 stop17h 55m

Southampton Eastleigh

Sun 1/11

5:45 pm-7:09 pm

2 stops30h 24m

$766

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sat 1/31

5:27 pm-5:15 pm

2 stops18h 48m

Southampton Eastleigh

Sat 2/7

9:25 am-4:05 pm

1 stop11h 40m

$772

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Fri 1/30

12:32 pm-8:45 am

2 stops15h 13m

Southampton Eastleigh

Fri 2/6

5:35 pm-4:05 pm

1 stop27h 30m

$772

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 1/29

12:32 pm-8:25 am

2 stops14h 53m

Southampton Eastleigh

Thu 2/5

9:00 am-4:05 pm

1 stop12h 05m

$772

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Thu 1/29

7:40 pm-5:10 pm

2 stops16h 30m

Southampton Eastleigh

Thu 2/5

8:10 pm-9:00 pm

3 stops29h 50m

$788

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Fri 1/30

11:35 am-2:50 pm

3 stops22h 15m

Southampton Eastleigh

Fri 2/6

7:50 pm-3:15 pm

2 stops24h 25m

$842

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sun 5/17

5:40 pm-8:35 am

1 stop9h 55m

Southampton Eastleigh

Sat 5/30

9:15 am-3:35 pm

1 stop11h 20m

$918

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Mon 5/18

6:10 pm-8:35 am

1 stop9h 25m

Southampton Eastleigh

Sun 5/31

9:15 am-3:35 pm

1 stop11h 20m

$918

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Sun 1/18

6:05 pm-8:50 am

1 stop9h 45m

$468

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

Mon 1/19

12:32 pm-8:50 am

2 stops15h 18m

$473

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 15 results

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 $423). Flying from Washington, D.C. Dulles Intl Airport to Portsmouth in June is currently the most expensive (average of $745). 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?

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 afternoon could potentially save you up to 43% on airfare.

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

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Portsmouth flight should consider departing on Saturday evenings when fares are most often at their lowest. Friday mornings 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

The most flights from IAD to P0R are scheduled on a Monday (26 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (22 on average).

Reviews of airlines servicing Portsmouth

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

7.9

Good

8,007 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Delta

7.9

Good

8,007 reviews

Delta

7.9

Good

8,007 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Aer Lingus

7.2

Good

1,395 reviews

Delta

7.9

Good

8,007 reviews

Reviews

1 / 20

6.0

Good

Jim,Nov 2025

AVL - ATL

Related info for your journey

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 17h 55m. KLM provides one of the quickest options available for as low as $766. 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 KLM (95%), Air France (92%) or Delta (92%) 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 $2,133, our data shows the cheapest flight currently is $350. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $766 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 $423). Flying from Washington, D.C. Dulles Intl Airport to Portsmouth in June is currently the most expensive (average of $745). 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

Dulles Intl to Heathrow flights

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Reagan-National to Heathrow flights

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Reagan-National to Gatwick flights

Dulles Intl to Luton flights

Dulles Intl to Edinburgh flights

Baltimore to Luton flights

Reagan-National to Luton flights

Baltimore to Edinburgh flights

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Dulles Intl to Manchester flights

Baltimore to Manchester flights

Reagan-National to Manchester flights

Baltimore to Stansted flights

Reagan-National to London City flights

Reagan-National to Stansted flights

Baltimore to London City flights

Dulles Intl to Newcastle upon Tyne flights

Dulles Intl to Birmingham flights

Dulles Intl to Leeds flights

Dulles Intl to Southampton flights

Baltimore to Birmingham flights

Baltimore to Leeds flights

Reagan-National to Birmingham flights

Dulles Intl to Liverpool flights

Reagan-National to Liverpool flights

Baltimore to Liverpool flights

Dulles Intl to Bristol flights

Reagan-National to Newcastle upon Tyne flights

Baltimore to Newcastle upon Tyne flights

Reagan-National to Leeds flights

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Dulles Intl to Southend flights

Baltimore to Southampton flights

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Reagan-National to Bristol flights

Dulles Intl to Newquay flights

Baltimore to Exeter flights

Dulles Intl to Exeter flights

Baltimore to Newquay flights

Baltimore to Southend flights

Reagan-National to Newquay flights

Baltimore to East Midlands flights

Complete your trip

Portsmouth car rentals

London Heathrow Airport car rentals

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London Luton Airport car rentals

London City Airport car rentals

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Top 10 airlines flying from Dulles Intl to Portsmouth

Airline	Cheapest	Average	Flexibility	On-time
TAP AIR PORTUGAL	Cheapest$395	Average$566	FlexibilityNo cancel fee	On-timeN/A
Icelandair	Cheapest$427	Average$640	FlexibilityNo cancel fee	On-time76%
Scandinavian Airlines	Cheapest$429	Average$593	FlexibilityNo cancel fee	On-time77%
Lufthansa	Cheapest$447	Average$1,061	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$544	Average$770	FlexibilityNo cancel fee	On-time70%
Delta	Cheapest$554	Average$966	FlexibilityNo cancel fee	On-timeN/A
Aer Lingus	Cheapest$558	Average$824	FlexibilityNo cancel fee	On-timeN/A
Virgin Atlantic	Cheapest$562	Average$783	FlexibilityNo cancel fee	On-time72%
United Airlines	Cheapest$564	Average$809	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$573	Average$800	FlexibilityNo cancel fee	On-time71%

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$468+ 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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Portsmouth with Cheapflights

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Cheap flight deals from Dulles Intl to Portsmouth

Cheapest flights from Dulles Intl to PortsmouthExplore 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 December 18, 2025.

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 December 18, 2025.

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 December 18, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Portsmouth that are best for you.

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.

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?

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 December 18, 2025.

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.

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

Reviews of airlines servicing Portsmouth

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.

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?

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

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Dulles Intl to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Dulles Intl to Portsmouth

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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 December 18, 2025.