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Cheap flights from Portsmouth to Washington, D.C. Dulles Intl Airport from £627

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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — IAD
30 May — 6 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Dulles Intl

Enter your travel dates to find the best prices.

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 30 April 2026.

Thu 29/1009:20
SOU
-
IAD
1 stop15h 10m
Aer Lingus
Thu 5/1117:05
IAD
-
SOU
1 stop10h 35m
Aer Lingus
Deal found 27/4£635
Sat 13/609:20
SOU
-
IAD
1 stop14h 40m
Aer Lingus
Sat 20/620:45
IAD
-
SOU
1 stop15h 05m
Aer Lingus
Deal found 29/4£639
Thu 11/609:20
SOU
-
IAD
1 stop14h 40m
Aer Lingus
Thu 18/620:45
IAD
-
SOU
1 stop17h 45m
Aer Lingus
Deal found 27/4£669
Thu 29/1009:20
SOU
-
IAD
1 stop15h 10m
Multiple Airlines
Thu 5/1121:45
IAD
-
SOU
2 stops16h 45m
Multiple Airlines
Deal found 26/4£726

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 30 April 2026.

Round-trip from

£639

One-way from

£627

Popular in

July

Cheapest in

February

Average price

£527
Aer Lingus
  • Aer Lingus
  • 13/6-20/6
  • 2 total stops
  • 29h 45m total
  • Portsmouth to Washington, D.C.
Search Deals
British Airways
  • British Airways
  • 1/7
  • 1 total stop
  • 14h 55m total
  • Portsmouth to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£45 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Dulles Intl 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 858,174 searches. Data last updated 30 April 2026.
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

Thu 11/6

09:20-19:00

1 stop14h 40m

Washington, D.C. Dulles Intl

Thu 18/6

20:45-19:30

1 stop17h 45m

£669

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sat 13/6

17:20-21:26

3 stops33h 06m

Washington, D.C. Dulles Intl

Sat 20/6

08:18-16:50

3 stops27h 32m

£911

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sat 13/6

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Sat 20/6

22:25-08:40

2 stops29h 15m

£939

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 22/5

09:20-19:25

1 stop15h 05m

Washington, D.C. Dulles Intl

Fri 29/5

17:35-14:25

2 stops15h 50m

£1,167
Fastest return journey

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 1/7

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Fri 3/7

21:00-16:50

1 stop14h 50m

£8,829
Cheapest one-way

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 1/7

09:20-19:15

1 stop14h 55m

£627
Fastest single journey

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 31/5

09:20-15:45

1 stop11h 25m

£824

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 11/8

09:15-19:35

1 stop15h 20m

£928

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 10/8

09:20-15:45

1 stop11h 25m

£928

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 9/8

20:00-15:45

1 stop24h 45m

£937

Flights are sorted by cheapest return flights first.

Deals found on 26/4

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

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.
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

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 30 April 2026.

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

Explore weekly flight availability from Portsmouth to Dulles Intl. 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 30 April 2026.

The most flights from P0R to IAD are scheduled on a Thursday (28 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (10 on average).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated 30 April 2026.
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
7.3
Good
1,536 reviews
Check prices

Crew

8.1

Boarding

7.4

Food

6.6

Entertainment

7.0

Comfort

7.2

Overall

7.3

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
7.3
Good
1,536 reviews
Aer Lingus
7.3
Good
1,536 reviews
Check prices

Crew

8.1

Boarding

7.4

Food

6.6

Entertainment

7.0

Comfort

7.2

Overall

7.3

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

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?

    Aer Lingus can get you from Portsmouth to Washington, D.C. Dulles Intl Airport in just under 14h 40m. Your travel time can differ by up to . Airlines will cover a distance of 3639 mi.

  • 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 (87%), Austrian Airlines (87%), Copa Airlines (87%).

  • 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 £449. On average you can expect to pay £1,001. The most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl), can usually be booked for £639.

  • 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.

See more FAQs

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

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Arlington
Alexandria
Sterling

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Alternative routes for Portsmouth to Dulles Intl

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

Top 10 airlines flying from Portsmouth to Dulles Intl

Discover the top 10 airlines that operate flights from Portsmouth to Dulles Intl. 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 858,174 searches. Data last updated 30 April 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£187Average£534FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
TAP AIR PORTUGALCheapest£329Average£410FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
IcelandairCheapest£330Average£512FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£362Average£580FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
LufthansaCheapest£400Average£575FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£407Average£548FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£409Average£564FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Scandinavian AirlinesCheapest£415Average£592FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Austrian AirlinesCheapest£415Average£573FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
FinnairCheapest£415Average£636FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

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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?

Cheapflights simply makes it quick and affordable to book flights from Portsmouth to Dulles Intl by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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.

Can Cheapflights notify me if prices for flights from Portsmouth to Dulles Intl become cheaper?

Of course! You can now track prices for flights from Portsmouth to Dulles Intl and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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