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 16h 25m. Virgin Atlantic provides one of the quickest options available for as low as $1,232. 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 $2,997, our data shows the cheapest flight currently is $354. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $906 for that flight.

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

Consider Aer Lingus (69%), Iberia (69%) or KLM (68%) 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.

$524+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Portsmouth

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Cheap flight deals from Dulles Intl to Portsmouth

Cheapest

Best

Last-minute

One-way

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 August 24, 2026.

Mon 10/54:00 pm -

2 stops22h 30m

Mon 10/128:00 pm -

2 stops24h 25m

Deal found 8/20

$906

Sun 10/411:20 pm -

2 stops32h 30m

Sun 10/119:20 am -

1 stop11h 25m

Deal found 8/20

$926

Wed 10/74:00 pm -

2 stops22h 30m

Wed 10/148:00 pm -

2 stops25h 05m

Deal found 8/23

$930

Wed 10/75:15 pm -

1 stop10h 25m

Wed 10/149:20 am -

1 stop15h 05m

Deal found 8/23

$959

Sun 10/45:15 pm -

1 stop18h 35m

Sun 10/119:20 am -

1 stop11h 25m

Deal found 8/20

$1,053

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 August 24, 2026.

Sun 10/43:45 pm -

3 stops22h 45m

Sun 10/118:25 am -

3 stops41h 10m

Deal found 8/20

$986

Fri 9/185:30 pm -

1 stop18h 20m

Fri 9/259:05 am -

1 stop11h 30m

Deal found 8/21

$1,213

Sun 9/611:10 am -

2 stops16h 25m

Tue 9/159:05 am -

1 stop11h 30m

Deal found 8/24

$1,232

Sun 9/611:10 am -

2 stops16h 25m

Tue 9/159:05 am -

2 stops19h 18m

Deal found 8/20

$1,240

Wed 9/238:55 pm -

1 stop17h 35m

Sat 9/268:00 pm -

1 stop24h 45m

Deal found 8/21

$1,359

Fri 9/188:30 pm -

2 stops18h 00m

Fri 9/258:00 pm -

1 stop24h 45m

Deal found 8/21

$1,287

Fri 10/165:15 pm -

1 stop10h 25m

Mon 10/198:00 pm -

1 stop24h 45m

Deal found 8/19

$1,414

Wed 11/49:55 pm -

2 stops16h 30m

Wed 11/119:20 am -

1 stop15h 10m

Deal found 8/21

$4,328

Last-minute flights from Dulles Intl to Portsmouth
Discover last-minute flight deals from Dulles Intl to Portsmouth. Data last updated August 24, 2026 and is based on user searches.

Sun 9/65:15 pm -

1 stop10h 25m

Tue 9/159:15 am -

1 stop11h 30m

Deal found 8/20

$1,132

Sun 9/611:10 am -

2 stops16h 25m

Tue 9/159:05 am -

1 stop11h 30m

Deal found 8/20

$1,231

Sun 9/611:10 am -

2 stops16h 25m

Tue 9/159:05 am -

2 stops19h 18m

Deal found 8/20

$1,240

Fri 9/185:30 pm -

1 stop18h 20m

Fri 9/259:05 am -

1 stop11h 30m

Deal found 8/21

$1,213

Fri 9/188:30 pm -

2 stops18h 00m

Fri 9/259:25 am -

2 stops14h 35m

Deal found 8/21

$1,254

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 August 24, 2026.

Sat 9/55:15 pm -

1 stop10h 20m

Deal found 8/20

$524

Sat 9/125:15 pm -

1 stop10h 20m

Deal found 8/24

$541

Sat 9/512:29 pm -

2 stops15h 16m

Deal found 8/24

$687

Sun 8/308:55 pm -

1 stop30h 45m

Deal found 8/23

$737

Sun 10/188:55 pm -

1 stop30h 45m

Deal found 8/20

$738

Sat 9/268:40 pm -

1 stop31h 00m

Deal found 8/22

$816

Find flight deals from Dulles Intl to Portsmouth

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$906 (Trip.com)
One-way from	$524 (Cheapflightsfares)
Popular in	June
Cheapest in	January
Average price	$909

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.

Search Deals

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. 19% potential increase in price ($206 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2026

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

Cheapest round-trip

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sun 10/4

3:45 pm-7:30 pm

3 stops22h 45m

Southampton Eastleigh

Sun 10/11

8:25 am-8:35 pm

3 stops41h 10m

$986

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Fri 9/18

5:30 pm-4:50 pm

1 stop18h 20m

Southampton Eastleigh

Fri 9/25

9:05 am-3:35 pm

1 stop11h 30m

$1,213

Quickest round-trip

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sun 9/6

11:10 am-8:35 am

2 stops16h 25m

Southampton Eastleigh

Tue 9/15

9:05 am-3:35 pm

1 stop11h 30m

$1,232

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sun 9/6

11:10 am-8:35 am

2 stops16h 25m

Southampton Eastleigh

Tue 9/15

9:05 am-11:23 pm

2 stops19h 18m

$1,240

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Fri 9/18

8:30 pm-7:30 pm

2 stops18h 00m

Southampton Eastleigh

Fri 9/25

8:00 pm-3:45 pm

1 stop24h 45m

$1,287

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Wed 9/23

8:55 pm-7:30 pm

1 stop17h 35m

Southampton Eastleigh

Sat 9/26

8:00 pm-3:45 pm

1 stop24h 45m

$1,359

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Fri 10/16

5:15 pm-8:40 am

1 stop10h 25m

Southampton Eastleigh

Mon 10/19

8:00 pm-3:45 pm

1 stop24h 45m

$1,414

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Wed 11/4

9:55 pm-7:25 pm

2 stops16h 30m

Southampton Eastleigh

Wed 11/11

9:20 am-7:30 pm

1 stop15h 10m

$4,328

Cheapest one-way

Quickest one-way

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sat 9/5

5:15 pm-8:35 am

1 stop10h 20m

$524

Washington, D.C.Southampton

IAD Washington, D.C. Dulles Intl - SOU Southampton Eastleigh

IADSOU

Washington, D.C. Dulles Intl

Sat 9/12

5:15 pm-8:35 am

1 stop10h 20m

$524

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 11 resultsSorted by cheapest first

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.

IAD-SOU

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

IAD-P0R

IAD-SOU

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

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.

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

The most flights from IAD to P0R are scheduled on a Wednesday (29 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 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 Aer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Aer Lingus

7.3

Good

1,722 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.

Aer Lingus

7.3

Good

1,722 reviews

Aer Lingus

7.3

Good

1,722 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Nov 2025

DUB - EDI

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 16h 25m. Virgin Atlantic provides one of the quickest options available for as low as $1,232. 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 Aer Lingus (69%), Iberia (69%) or KLM (68%) 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 $2,997, our data shows the cheapest flight currently is $354. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $906 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

Browse thousands of different options on Cheapflights for your next trip

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Other flights from Dulles Intl

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Alternative routes for Dulles Intl to Portsmouth

Top 10 airlines flying from Dulles Intl to Portsmouth

Airline	Cheapest	Average	Flexibility	On-time
TAP AIR PORTUGAL	Cheapest$309	Average$545	FlexibilityNo cancel fee	On-timeN/A
Virgin Atlantic	Cheapest$449	Average$895	FlexibilityNo cancel fee	On-time72%
Iberia	Cheapest$484	Average$773	FlexibilityNo cancel fee	On-time77%
Icelandair	Cheapest$487	Average$678	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$530	Average$930	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$560	Average$798	FlexibilityNo cancel fee	On-time77%
Air France	Cheapest$581	Average$1,067	FlexibilityNo cancel fee	On-time77%
SWISS	Cheapest$593	Average$860	FlexibilityNo cancel fee	On-time79%
British Airways	Cheapest$601	Average$927	FlexibilityNo cancel fee	On-time70%
Aer Lingus	Cheapest$607	Average$964	FlexibilityNo cancel fee	On-timeN/A

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$524+ 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 9/5. 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 August 24, 2026.

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 August 24, 2026.

Best flights from Dulles Intl to PortsmouthDiscover 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 August 24, 2026.

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 August 24, 2026.

Last-minute flights from Dulles Intl to PortsmouthDiscover last-minute flight deals from Dulles Intl to Portsmouth. Data last updated August 24, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Portsmouth. Data last updated August 24, 2026 and is based on user searches.

One-way flights from Dulles Intl to PortsmouthSearch for one-way flight options from Dulles Intl to Portsmouth. Find affordable one-way fares based on user searches. Data last updated August 24, 2026.

Search for one-way flight options from Dulles Intl to Portsmouth. Find affordable one-way fares based on user searches. Data last updated August 24, 2026.

Find flight deals from Dulles Intl to Portsmouth

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Round-trip from

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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

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 August 24, 2026.

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.

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

The most flights from IAD to P0R are scheduled on a Wednesday (29 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 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 Aer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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?

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.

Complete your trip

Complete your trip to Portsmouth by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Dulles Intl to Portsmouth by cabin class

Find flights from Dulles Intl to Portsmouth, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Dulles Intl and Portsmouth flights

Browse other Dulles Intl and Portsmouth flight options. Last updated on August 24, 2026.

Other flights from Dulles Intl

Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on August 24, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Dulles Intl to Portsmouth flights

Consider these flights traveling from Dulles Intl to Portsmouth.

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 August 24, 2026.

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 August 24, 2026.

Last-minute flights from Dulles Intl to Portsmouth
Discover last-minute flight deals from Dulles Intl to Portsmouth. Data last updated August 24, 2026 and is based on user searches.

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 August 24, 2026.