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

Aer Lingus and British Airways can get you from Portsmouth to Washington, D.C. Dulles Intl Airport in just under 24h 45m. Your travel time can differ by up to 10m. Airlines will cover a distance of 3639 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

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

The cheapest flight price from Portsmouth to Washington, D.C. Dulles Intl Airport is £416. On average you can expect to pay £1,442. The most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl), can usually be booked for £702.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portsmouth to Washington, D.C. Dulles Intl Airport on time: Air Canada (89%), Austrian Airlines (89%), Copa Airlines (89%).

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

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

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

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

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

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

£379+ Cheap Flights from Portsmouth to Washington, D.C. Dulles Intl Airport

Cheap flight deals from Portsmouth to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Portsmouth to Dulles Intl
Explore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 March 2026.

Wed 29/420:00

SOU

IAD

1 stop24h 45m

Aer Lingus

Wed 6/517:15

IAD

SOU

1 stop10h 25m

Aer Lingus

Deal found 15/3£621

Fri 1/520:00

SOU

IAD

1 stop28h 10m

Aer Lingus

Fri 8/520:55

IAD

SOU

1 stop30h 40m

Aer Lingus

Deal found 17/3£629

Wed 29/406:50

SOU

IAD

2 stops17h 35m

Multiple Airlines

Wed 6/517:15

IAD

SOU

1 stop10h 25m

Multiple Airlines

Deal found 15/3£650

Fri 1/520:00

SOU

IAD

1 stop24h 45m

Multiple Airlines

Fri 8/517:15

IAD

SOU

2 stops13h 30m

Multiple Airlines

Deal found 17/3£681

Mon 4/519:55

SOU

IAD

2 stops24h 55m

British Airways

Mon 11/517:15

IAD

SOU

1 stop10h 25m

British Airways

Deal found 14/3£702

Wed 6/506:50

SOU

IAD

2 stops14h 00m

British Airways

Tue 12/517:15

IAD

SOU

1 stop9h 50m

British Airways

Deal found 14/3£703

Wed 1/409:20

SOU

IAD

1 stop11h 25m

Aer Lingus

Sun 5/417:15

IAD

SOU

1 stop10h 25m

Aer Lingus

Deal found 16/3£704

Wed 15/409:20

SOU

IAD

1 stop11h 25m

British Airways

Sun 19/417:15

IAD

SOU

1 stop10h 25m

British Airways

Deal found 15/3£710

Fri 8/520:00

SOU

IAD

1 stop24h 45m

British Airways

Mon 11/517:15

IAD

SOU

1 stop10h 25m

British Airways

Deal found 14/3£714

Find flight deals from Portsmouth to Dulles Intl

Round-trip from	£621
One-way from	£379
Popular in	July
Cheapest in	February
Average price	£523

Aer Lingus
29/4-6/5
2 total stops
35h 10m total
Portsmouth to Washington, D.C.

Search Deals

20/5
3 total stops
34h 00m total
Portsmouth to Washington, D.C.

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£55 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).

Search Deals

Average for round-trip flights in March 2026

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 29/4

20:00-15:45

1 stop24h 45m

Washington, D.C. Dulles Intl

Wed 6/5

17:15-08:40

1 stop10h 25m

£621

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 29/4

06:50-19:25

2 stops17h 35m

Washington, D.C. Dulles Intl

Wed 6/5

17:15-08:40

1 stop10h 25m

£650

Fastest return journey

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 15/4

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Sun 19/4

17:15-08:40

1 stop10h 25m

£710

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 14/6

20:45-17:25

2 stops25h 40m

Washington, D.C. Dulles Intl

Mon 29/6

19:15-14:45

2 stops14h 30m

£716

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 16/6

08:55-20:20

2 stops16h 25m

Washington, D.C. Dulles Intl

Tue 30/6

19:15-17:40

2 stops17h 25m

£732

Cheapest one-way

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 20/5

15:35-20:35

3 stops34h 00m

£379

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 26/8

14:20-15:10

3 stops29h 50m

£403

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 17/5

20:45-15:50

2 stops24h 05m

£653

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 26/8

09:20-20:24

2 stops16h 04m

£654

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 22/6

06:50-17:25

2 stops15h 35m

£662

Flights are sorted by cheapest return flights first.

Deals found on 14/3

Showing 1-10 of 14 resultsSorted by cheapest first

Best time to book a flight from Portsmouth to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Portsmouth with our price prediction graph.

SOU-IAD

Estimated return 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 Portsmouth to Washington, D.C. Dulles Intl Airport

P0R-IAD

SOU-IAD

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

Currently, January is the cheapest month in which you can book a flight from Portsmouth to Washington, D.C. Dulles Intl Airport (average of £338). Flying from Portsmouth to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £463). 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 P0R to IAD?

When flying from Portsmouth to Washington, D.C. Dulles Intl Airport, 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 Portsmouth to Washington, D.C. Dulles Intl Airport

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

Reviews of airlines servicing Dulles Intl

Get a feel of what it's like to fly with Aer Lingus from Portsmouth to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Aer Lingus

7.2

Good

1,477 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.

Aer Lingus

7.2

Good

1,477 reviews

Aer Lingus

7.2

Good

1,477 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.

Related info for your journey

How long is the flight from Portsmouth to Washington, D.C. Dulles Intl Airport?
Aer Lingus and British Airways can get you from Portsmouth to Washington, D.C. Dulles Intl Airport in just under 24h 45m. Your travel time can differ by up to 10m. Airlines will cover a distance of 3639 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the most reliable airlines from Portsmouth to Washington, D.C. Dulles Intl Airport?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portsmouth to Washington, D.C. Dulles Intl Airport on time: Air Canada (89%), Austrian Airlines (89%), Copa Airlines (89%).
What are the cheapest flights from Portsmouth to Washington, D.C. Dulles Intl Airport?
The cheapest flight price from Portsmouth to Washington, D.C. Dulles Intl Airport is £416. On average you can expect to pay £1,442. The most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl), can usually be booked for £702.
Can I find deals for flights from Portsmouth to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Portsmouth to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Portsmouth to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portsmouth to Dulles Intl.
Can I find deals for business class flights from Portsmouth to Dulles Intl?
Yes. Cheapflights offers flight deals from Portsmouth to Dulles Intl 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 Portsmouth to Washington, D.C. Dulles Intl Airport?
Currently, January is the cheapest month in which you can book a flight from Portsmouth to Washington, D.C. Dulles Intl Airport (average of £338). Flying from Portsmouth to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £463). 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

Silver Spring

Hanover

Oxon Hill

Gaithersburg

Woodbridge

Arlington

Alexandria

Sterling

College Park

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Alternative routes for Portsmouth to Dulles Intl

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Gatwick to Baltimore flights

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Luton to Baltimore flights

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Bristol to Baltimore flights

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Leeds to Reagan-National flights

Doncaster to Dulles Intl flights

East Midlands to Baltimore flights

Doncaster to Baltimore flights

Top 10 airlines flying from Portsmouth to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest£190	Average£543	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
TAP AIR PORTUGAL	Cheapest£335	Average£455	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Icelandair	Cheapest£338	Average£563	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Aer Lingus	Cheapest£367	Average£602	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Lufthansa	Cheapest£411	Average£591	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£413	Average£558	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£414	Average£564	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£419	Average£584	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Austrian Airlines	Cheapest£422	Average£586	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
KLM	Cheapest£429	Average£576	FlexibilityNo cancel fee	On-time75%	Search KLM flights

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How does Cheapflights help users find flights from Portsmouth to Dulles Intl?

When you search for this flight from Portsmouth to Dulles Intl, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Dulles Intl?

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Can Cheapflights find flights from Portsmouth to Dulles Intl with no change fees?

Yes! Cheapflights helps users easily find flights from Portsmouth to Dulles Intl with no change fees.

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Cheap flights from Portsmouth to Washington, D.C. Dulles Intl Airport from £379

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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Portsmouth to Dulles Intl

Cheapest flights from Portsmouth to Dulles IntlExplore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 March 2026.

Explore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 March 2026.

Best flights from Portsmouth to Dulles IntlDiscover carefully curated flight deals from Portsmouth to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 March 2026.

Discover carefully curated flight deals from Portsmouth to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 March 2026.

Last-minute flights from Portsmouth to Dulles IntlDiscover last-minute flight deals from Portsmouth to Dulles Intl. Data last updated 17 March 2026 and is based on user searches.

Discover last-minute flight deals from Portsmouth to Dulles Intl. Data last updated 17 March 2026 and is based on user searches.

One-way flights from Portsmouth to Dulles IntlSearch for one-way flight options from Portsmouth to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 17 March 2026.

Search for one-way flight options from Portsmouth to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 17 March 2026.

Find flight deals from Portsmouth to Dulles Intl

Keep the following information in mind while searching for Portsmouth to Dulles Intl flight deals. Data was last updated 17 March 2026.

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 Portsmouth to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Portsmouth to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Portsmouth with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Portsmouth to Washington, D.C. Dulles Intl Airport

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

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

Find hourly flight availability from Portsmouth to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 17 March 2026.

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

Reviews of airlines servicing Dulles Intl

Get a feel of what it's like to fly with Aer Lingus from Portsmouth to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Dulles Intl. 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 Portsmouth to Washington, D.C. Dulles Intl Airport?

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

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

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

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

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

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

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Portsmouth to Dulles Intl

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Complete your trip

Complete your trip to Dulles Intl by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to District of Columbia

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Other flights to Dulles Intl

Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 17 March 2026.

Search flights from Portsmouth to Dulles Intl by cabin class

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

Portsmouth and Dulles Intl flights

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Portsmouth to Dulles Intl flights

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Top 10 airlines flying from Portsmouth to Dulles Intl

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Cheapest flights from Portsmouth to Dulles Intl
Explore the most affordable flight options available from Portsmouth to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 March 2026.

Best flights from Portsmouth to Dulles Intl
Discover carefully curated flight deals from Portsmouth to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 March 2026.

Last-minute flights from Portsmouth to Dulles Intl
Discover last-minute flight deals from Portsmouth to Dulles Intl. Data last updated 17 March 2026 and is based on user searches.

One-way flights from Portsmouth to Dulles Intl
Search for one-way flight options from Portsmouth to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 17 March 2026.