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Cheap flights from Portsmouth to Washington, D.C. from £523

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — WAS
27 Feb — 6 Mar1
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 28 January 2026.

Wed 4/312:25
SOU
-
IAD
1 stop12h 05m
British Airways
Sun 8/318:05
IAD
-
SOU
1 stop10h 40m
British Airways
Deal found 26/1£523
Thu 12/308:50
SOU
-
IAD
1 stop12h 15m
KLM
Thu 19/313:19
IAD
-
SOU
2 stops15h 01m
KLM
Deal found 25/1£539
Thu 12/308:50
SOU
-
DCA
2 stops18h 49m
Delta
Thu 19/306:14
DCA
-
SOU
2 stops22h 06m
Delta
Deal found 25/1£544
Fri 13/308:50
SOU
-
DCA
2 stops18h 01m
Virgin Atlantic
Fri 20/306:14
DCA
-
SOU
2 stops22h 36m
Virgin Atlantic
Deal found 27/1£575
Fri 13/309:30
SOU
-
IAD
1 stop15h 00m
British Airways
Fri 20/318:05
IAD
-
SOU
1 stop10h 40m
British Airways
Deal found 27/1£609
Fri 13/308:50
SOU
-
IAD
1 stop12h 15m
Multiple Airlines
Fri 20/319:29
IAD
-
SOU
2 stops33h 21m
Multiple Airlines
Deal found 27/1£637
Thu 12/308:50
SOU
-
BWI
2 stops17h 24m
KLM
Thu 19/311:56
BWI
-
SOU
2 stops16h 24m
KLM
Deal found 25/1£657
Fri 13/308:50
SOU
-
IAD
2 stops15h 40m
KLM
Fri 20/322:40
IAD
-
SOU
2 stops14h 20m
KLM
Deal found 27/1£686
Fri 13/317:35
SOU
-
DCA
3 stops30h 10m
Multiple Airlines
Fri 20/306:59
DCA
-
SOU
3 stops27h 51m
Multiple Airlines
Deal found 27/1£710
Fri 13/308:50
SOU
-
BWI
2 stops18h 11m
Delta
Fri 20/315:35
BWI
-
SOU
2 stops21h 25m
Delta
Deal found 27/1£711
Wed 4/208:55
SOU
-
BWI
2 stops14h 50m
British Airways
Sun 8/220:35
BWI
-
SOU
2 stops16h 55m
British Airways
Deal found 25/1£713
Thu 12/308:00
SOU
-
BWI
3 stops19h 59m
Multiple Airlines
Thu 19/320:40
BWI
-
SOU
2 stops16h 30m
Multiple Airlines
Deal found 25/1£774

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 28 January 2026.

Round-trip from

£523

Popular in

July

Cheapest in

February

Average price

£463
British Airways
  • British Airways
  • 4/3-8/3
  • 2 total stops
  • 22h 45m 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 (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 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 28 January 2026.
Use the filters below to find and compare flights from Portsmouth to Washington, D.C. that are best for you.

Fly from

Portsmouth

Fly to

Washington, D.C.

Route

Depart

Return

Price

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 4/3

12:25-19:30

1 stop12h 05m

Washington, D.C. Dulles Intl

Sun 8/3

22:00-19:40

1 stop17h 40m

£523

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 12/3

08:50-17:05

1 stop12h 15m

Washington, D.C. Dulles Intl

Thu 19/3

13:19-08:20

2 stops15h 01m

£539

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Fri 13/3

08:50-23:44

2 stops18h 54m

Washington, D.C. Reagan-National

Fri 20/3

06:14-08:50

2 stops22h 36m

£544

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Thu 12/3

08:50-23:39

2 stops18h 49m

Washington, D.C. Reagan-National

Thu 19/3

06:14-08:20

2 stops22h 06m

£544

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Fri 13/3

08:50-22:51

2 stops18h 01m

Washington, D.C. Reagan-National

Fri 20/3

06:14-08:50

2 stops22h 36m

£575

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 13/3

09:30-20:30

1 stop15h 00m

Washington, D.C. Dulles Intl

Fri 20/3

18:05-08:45

1 stop10h 40m

£609

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 13/3

08:50-17:05

1 stop12h 15m

Washington, D.C. Dulles Intl

Fri 20/3

19:29-08:50

2 stops33h 21m

£637

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 12/3

08:50-22:14

2 stops17h 24m

Baltimore/Washington

Thu 19/3

11:56-08:20

2 stops16h 24m

£657

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 13/3

08:50-20:30

2 stops15h 40m

Washington, D.C. Dulles Intl

Fri 20/3

22:40-17:00

2 stops14h 20m

£686

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Fri 13/3

08:50-23:01

2 stops18h 11m

Baltimore/Washington

Fri 20/3

15:35-17:00

2 stops21h 25m

£711

Flights are sorted by cheapest return flights first.

Deals found on 25/1

Showing 1-10 of 15 results
1
2

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 month to book a flight from Portsmouth to Washington, D.C.?

Currently, February is the cheapest month in which you can book a flight from Portsmouth to Washington, D.C. (average of £222). Flying from Portsmouth to Washington, D.C. in July is currently the most expensive (average of £464). 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 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 28 January 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 28 January 2026.

The most flights from P0R to WAS 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 Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. 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 Washington, D.C.. Reviews last updated 28 January 2026.
See what other customers who have flown with Aer Lingus from Portsmouth to Washington, D.C. have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,442 reviews
Check prices

Entertainment

6.9

Crew

8.0

Food

6.6

Overall

7.2

Comfort

7.1

Boarding

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

MAN - DUB

They did not list a gate until it was time to board.
Aer Lingus
7.2
Good
1,442 reviews
Aer Lingus
7.2
Good
1,442 reviews
Check prices

Entertainment

6.9

Crew

8.0

Food

6.6

Overall

7.2

Comfort

7.1

Boarding

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

MAN - DUB

They did not list a gate until it was time to board.

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 12h 05m. British Airways provides one of the quickest options available for as low as £523. 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 - Baltimore/Washington. You may also consider Southampton Eastleigh - Washington, D.C. Dulles Intl or Southampton Eastleigh - Washington, D.C. Reagan-National.

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

    Consider Air Canada (83%), Austrian Airlines (83%) or Copa Airlines (83%) 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 £1,348 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £367 while the most popular route, (Southampton Eastleigh - Baltimore/Washington) is currently priced at £657.

  • 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.

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

    Currently, February is the cheapest month in which you can book a flight from Portsmouth to Washington, D.C. (average of £222). Flying from Portsmouth to Washington, D.C. in July is currently the most expensive (average of £464). 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

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
Woodbridge
Arlington
Alexandria
College Park

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Alternative routes for Portsmouth to Washington, D.C.

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

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 28 January 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£184Average£552FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£261Average£393FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
IcelandairCheapest£327Average£516FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£341Average£468FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£368Average£729FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
KLMCheapest£368Average£580FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£396Average£539FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£398Average£636FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£407Average£607FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Virgin AtlanticCheapest£408Average£552FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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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