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Cheap flights from Portsmouth to Washington, D.C. from £431

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 23/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — WAS
12 Jul — 19 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Washington, D.C.

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Washington, D.C.
Explore the most affordable flight options available from Portsmouth to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 June 2026.

Wed 8/709:20
SOU
-
IAD
1 stop11h 25m
British Airways
Fri 24/717:15
IAD
-
SOU
1 stop18h 35m
British Airways
Deal found 8/6£508
Thu 29/1009:20
SOU
-
IAD
1 stop15h 10m
British Airways
Thu 5/1117:05
IAD
-
SOU
1 stop10h 35m
British Airways
Deal found 9/6£510
Sun 5/720:00
SOU
-
IAD
1 stop28h 15m
British Airways
Sun 12/717:15
IAD
-
SOU
1 stop18h 35m
British Airways
Deal found 7/6£517
Sun 27/920:00
SOU
-
IAD
1 stop24h 45m
British Airways
Sun 4/1017:15
IAD
-
SOU
1 stop10h 25m
British Airways
Deal found 11/6£522
Wed 5/809:20
SOU
-
IAD
1 stop15h 05m
British Airways
Wed 12/817:15
IAD
-
SOU
1 stop10h 25m
British Airways
Deal found 8/6£523
Thu 29/1008:40
SOU
-
BWI
2 stops18h 15m
Virgin Atlantic
Thu 5/1112:15
BWI
-
SOU
2 stops14h 55m
Virgin Atlantic
Deal found 11/6£570
Thu 29/1008:40
SOU
-
BWI
2 stops18h 15m
KLM
Thu 5/1112:15
BWI
-
SOU
2 stops14h 55m
KLM
Deal found 9/6£570
Wed 8/709:15
SOU
-
BWI
2 stops18h 14m
Delta
Fri 24/714:08
BWI
-
SOU
2 stops13h 37m
Delta
Deal found 11/6£592
Wed 8/709:15
SOU
-
DCA
2 stops18h 44m
Delta
Fri 24/711:00
DCA
-
SOU
2 stops16h 45m
Delta
Deal found 11/6£592
Thu 19/1112:35
SOU
-
BWI
2 stops35h 10m
British Airways
Mon 23/1120:35
BWI
-
SOU
2 stops17h 25m
British Airways
Deal found 7/6£602
Sun 26/709:15
SOU
-
BWI
2 stops36h 26m
KLM
Sun 2/817:00
BWI
-
SOU
2 stops34h 45m
KLM
Deal found 11/6£642
Wed 8/709:15
SOU
-
DCA
2 stops17h 47m
KLM
Fri 24/712:55
DCA
-
SOU
2 stops14h 50m
KLM
Deal found 7/6£662

Find flight deals from Portsmouth to Washington, D.C.

Keep the following information in mind while searching for Portsmouth to Washington, D.C. flight deals. Data was last updated 12 June 2026.

Round-trip from

£508

One-way from

£431

Popular in

June

Cheapest in

February

Average price

£593
British Airways
  • British Airways
  • 8/7-24/7
  • 2 total stops
  • 30h 00m total
  • Portsmouth to Washington, D.C.
Search Deals
British Airways
  • British Airways
  • 23/11
  • 1 total stop
  • 11h 15m total
  • Portsmouth to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£42 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 June 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Washington, D.C. 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 12 June 2026.
Use the filters below to find and compare flights from Portsmouth to Washington, D.C. 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 8/7

09:20-19:15

1 stop14h 55m

Washington, D.C. Dulles Intl

Fri 24/7

17:15-16:50

1 stop18h 35m

£509
Fastest return journey

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 29/10

09:20-16:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Thu 5/11

17:05-08:40

1 stop10h 35m

£509

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 9/7

09:20-15:45

1 stop11h 25m

Washington, D.C. Dulles Intl

Thu 13/8

20:40-19:30

1 stop17h 50m

£517

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Sun 27/9

20:00-15:45

1 stop24h 45m

Washington, D.C. Dulles Intl

Sun 4/10

17:15-08:40

1 stop10h 25m

£522

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 28/7

09:15-15:45

1 stop11h 30m

Washington, D.C. Dulles Intl

Fri 7/8

20:55-16:50

1 stop14h 55m

£523

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 29/10

08:40-16:45

1 stop12h 05m

Washington, D.C. Dulles Intl

Thu 5/11

19:59-17:00

2 stops16h 01m

£567

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 29/10

08:40-22:55

2 stops18h 15m

Baltimore/Washington

Thu 5/11

12:15-08:10

2 stops14h 55m

£570

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 29/10

08:40-23:02

2 stops18h 22m

Washington, D.C. Dulles Intl

Thu 5/11

19:59-17:00

2 stops16h 01m

£570

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 29/10

08:40-22:55

2 stops18h 15m

Baltimore/Washington

Thu 5/11

12:15-08:10

2 stops14h 55m

£570

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 28/8

19:30-19:40

2 stops29h 10m

Washington, D.C. Dulles Intl

Tue 1/9

21:05-16:50

1 stop14h 45m

£587

Flights are sorted by cheapest return flights first.

Deals found on 9/6

Showing 1-10 of 43 resultsSorted by cheapest first
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Best time to book a flight from Portsmouth to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. 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.

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

Find hourly flight availability from Portsmouth to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 June 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to Washington, D.C. as you normally would.

Weekly flight availability from Portsmouth to Washington, D.C.

Explore weekly flight availability from Portsmouth to Washington, D.C.. 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 12 June 2026.

The most flights from P0R to WAS are scheduled on a Wednesday (28 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (27 on average).

Related info for your journey

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

    A quick flight from Portsmouth to Washington, D.C. can take about 14h 55m. British Airways provides one of the quickest options available for as low as £509. The distance from Portsmouth to Washington, D.C. is about 3639 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most popular routes from Portsmouth to Washington, D.C.?

    The most popular route from Portsmouth to Washington, D.C. is Southampton Eastleigh - Washington, D.C. Dulles Intl. You may also consider Southampton Eastleigh - Baltimore/Washington or Southampton Eastleigh - Washington, D.C. Reagan-National.

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

    Consider Air Canada (91%), Austrian Airlines (91%) or Copa Airlines (91%) when booking your flight. These represent the most reliable airlines when flying from Portsmouth to Washington, D.C..

  • What are the cheapest flights from Portsmouth to Washington, D.C.?

    On average you can expect to pay £1,019 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £445 while the most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl) is currently priced at £509.

  • Can I find deals for flights from Portsmouth to Washington, D.C. that include hotel bookings?

    Yes. In addition to deals on Portsmouth to Washington, D.C. flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Portsmouth to Washington, D.C.?

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

  • Can I find deals for business class flights from Portsmouth to Washington, D.C.?

    Yes. Cheapflights offers flight deals from Portsmouth to Washington, D.C. 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.?

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

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from Portsmouth to Washington, D.C.

Discover the top 10 airlines that operate flights from Portsmouth to Washington, D.C.. 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 12 June 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£329Average£507FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
United AirlinesCheapest£332Average£561FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
TAP AIR PORTUGALCheapest£332Average£414FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£365Average£675FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
KLMCheapest£378Average£560FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£400Average£573FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£405Average£601FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£408Average£538FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£411Average£577FlexibilityNo cancel feeOn-time70%
Search British Airways flights
JetBlueCheapest£415Average£598FlexibilityNo cancel feeOn-time62%
Search JetBlue flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Portsmouth to Washington, D.C.?

Deals for Portsmouth to Washington, D.C. flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Washington, D.C.?

Cheapflights simply makes it quick and affordable to book flights from Portsmouth to Washington, D.C. 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 Washington, D.C. with no change fees?

Certainly. Search results for flights to Washington, D.C. from Portsmouth shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Portsmouth to Washington, D.C. become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Washington, D.C. from Portsmouth today and book when prices fit your budget.

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