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Cheap flights from Portsmouth to Washington, D.C. 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.
LHR — WAS
16 Apr — 23 Apr1
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 17 March 2026.

Sun 26/409:20
SOU
-
IAD
1 stop15h 05m
Aer Lingus
Sun 3/517:15
IAD
-
SOU
1 stop10h 25m
Aer Lingus
Deal found 12/3£565
Wed 29/409:20
SOU
-
BWI
2 stops15h 05m
Multiple Airlines
Wed 6/520:30
BWI
-
SOU
2 stops15h 20m
Multiple Airlines
Deal found 15/3£619
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
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
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
Mon 4/519:55
SOU
-
IAD
2 stops24h 55m
British Airways
Tue 12/522:25
IAD
-
SOU
2 stops17h 40m
British Airways
Deal found 14/3£711
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
Fri 1/519:55
SOU
-
BWI
2 stops28h 45m
British Airways
Mon 4/521:30
BWI
-
SOU
2 stops18h 25m
British Airways
Deal found 12/3£726
Thu 30/420:00
SOU
-
DCA
2 stops52h 03m
Multiple Airlines
Thu 7/506:00
DCA
-
SOU
2 stops32h 30m
Multiple Airlines
Deal found 16/3£763

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 17 March 2026.

Round-trip from

£565

One-way from

£379

Popular in

July

Cheapest in

February

Average price

£523
Aer Lingus
  • Aer Lingus
  • 26/4-3/5
  • 2 total stops
  • 25h 30m total
  • Portsmouth to Washington, D.C.
Search Deals
20/5
  • 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

 
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 17 March 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 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

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Tue 5/5

06:50-19:40

2 stops17h 50m

Baltimore/Washington

Mon 11/5

21:30-19:25

2 stops16h 55m

£711

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Wed 29/4

09:20-19:25

2 stops15h 05m

Baltimore/Washington

Wed 6/5

20:30-20:45

3 stops19h 15m

£711

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Mon 4/5

19:55-19:40

2 stops28h 45m

Baltimore/Washington

Mon 11/5

21:30-19:25

2 stops16h 55m

£711

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 5/5

19:55-17:25

2 stops26h 30m

Washington, D.C. Dulles Intl

Tue 12/5

22:25-21:05

2 stops17h 40m

£711

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 4/5

19:55-15:50

2 stops24h 55m

Washington, D.C. Dulles Intl

Tue 12/5

22:25-21:05

2 stops17h 40m

£711

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Fri 1/5

19:55-19:40

2 stops28h 45m

Baltimore/Washington

Mon 4/5

21:30-20:55

2 stops18h 25m

£726

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Wed 6/5

06:50-19:40

2 stops17h 50m

Baltimore/Washington

Mon 11/5

21:30-19:25

2 stops16h 55m

£726

Flights are sorted by cheapest return flights first.

Deals found on 14/3

Showing 1-10 of 36 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 month to book a flight from Portsmouth to Washington, D.C.?

Currently, January is the cheapest month in which you can book a flight from Portsmouth to Washington, D.C. (average of £338). Flying from Portsmouth to Washington, D.C. 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 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 17 March 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 17 March 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).

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 11h 25m. Aer Lingus provides one of the quickest options available for as low as £710. 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 (89%), Austrian Airlines (89%) or Copa Airlines (89%) 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 £1,442 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £416 while the most popular route, (Southampton Eastleigh - Baltimore/Washington) is currently priced at £754.

  • 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, January is the cheapest month in which you can book a flight from Portsmouth to Washington, D.C. (average of £338). Flying from Portsmouth to Washington, D.C. 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

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
Arlington
Alexandria
College Park

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 17 March 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£190Average£580FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£306Average£448FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
United AirlinesCheapest£334Average£529FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IcelandairCheapest£338Average£541FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£345Average£467FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£367Average£754FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
KLMCheapest£381Average£576FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£403Average£597FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£411Average£587FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£414Average£556FlexibilityNo 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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