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Cheap flights from Portsmouth to Washington, D.C. from £434

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
22 Aug — 29 Aug1
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 23 July 2026.

Fri 4/920:00
SOU
-
IAD
2 stops24h 30m
Aer Lingus
Fri 11/917:00
IAD
-
SOU
2 stops18h 50m
Aer Lingus
Deal found 21/7£533
Thu 29/1009:20
SOU
-
IAD
2 stops36h 00m
Aer Lingus
Thu 5/1121:00
IAD
-
SOU
1 stop14h 35m
Aer Lingus
Deal found 19/7£546
Thu 6/817:20
SOU
-
IAD
2 stops27h 10m
Aer Lingus
Sun 9/817:15
IAD
-
SOU
1 stop10h 25m
Aer Lingus
Deal found 19/7£550
Sat 5/909:20
SOU
-
IAD
1 stop11h 25m
Aer Lingus
Sat 12/917:15
IAD
-
SOU
1 stop10h 20m
Aer Lingus
Deal found 22/7£564
Sat 5/909:15
SOU
-
BWI
2 stops17h 13m
Delta
Sat 12/912:30
BWI
-
SOU
2 stops15h 15m
Delta
Deal found 22/7£650
Fri 4/909:05
SOU
-
DCA
2 stops18h 54m
Delta
Fri 11/912:55
DCA
-
SOU
2 stops14h 50m
Delta
Deal found 22/7£650
Thu 29/1008:40
SOU
-
BWI
2 stops18h 24m
Delta
Thu 5/1106:10
BWI
-
SOU
2 stops21h 00m
Delta
Deal found 20/7£652
Fri 4/909:05
SOU
-
BWI
2 stops18h 34m
Delta
Fri 11/910:40
BWI
-
SOU
2 stops17h 05m
Delta
Deal found 21/7£653
Thu 1/1017:20
SOU
-
BWI
2 stops35h 04m
Virgin Atlantic
Fri 6/1112:15
BWI
-
SOU
2 stops15h 40m
Virgin Atlantic
Deal found 22/7£681
Sat 5/909:20
SOU
-
DCA
2 stops18h 11m
Multiple Airlines
Sat 12/912:55
DCA
-
SOU
3 stops25h 35m
Multiple Airlines
Deal found 22/7£743
Thu 1/1017:20
SOU
-
BWI
2 stops31h 20m
Multiple Airlines
Fri 6/1119:40
BWI
-
SOU
3 stops35h 25m
Multiple Airlines
Deal found 22/7£762
Fri 4/909:20
SOU
-
DCA
3 stops31h 40m
Multiple Airlines
Fri 11/912:40
DCA
-
SOU
3 stops23h 10m
Multiple Airlines
Deal found 21/7£795

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 23 July 2026.

Round-trip from

£533

One-way from

£434

Popular in

June

Cheapest in

February

Average price

£570
Aer Lingus
  • Aer Lingus
  • 4/9-11/9
  • 4 total stops
  • 43h 20m 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 (£39 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 23 July 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

Thu 29/10

09:20-17:20

2 stops36h 00m

Washington, D.C. Dulles Intl

Thu 5/11

21:00-16:35

1 stop14h 35m

£546

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Fri 4/9

17:20-15:30

2 stops27h 10m

Washington, D.C. Dulles Intl

Fri 11/9

17:00-16:50

2 stops18h 50m

£547

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 29/10

09:20-17:20

2 stops36h 00m

Washington, D.C. Dulles Intl

Thu 5/11

21:00-17:40

2 stops15h 40m

£617

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Sat 5/9

09:15-21:28

2 stops17h 13m

Baltimore/Washington

Sat 12/9

12:30-08:45

2 stops15h 15m

£650

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 29/10

08:40-23:04

2 stops18h 24m

Baltimore/Washington

Thu 5/11

06:10-08:10

2 stops21h 00m

£650

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Sat 5/9

09:15-21:45

2 stops17h 30m

Washington, D.C. Reagan-National

Sat 12/9

11:10-08:45

2 stops16h 35m

£650

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Fri 4/9

09:05-22:59

2 stops18h 54m

Washington, D.C. Reagan-National

Fri 11/9

12:55-08:45

2 stops14h 50m

£650

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Thu 1/10

09:05-20:37

2 stops16h 32m

Washington, D.C. Reagan-National

Fri 6/11

19:40-17:00

2 stops16h 20m

£650

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Tue 1/9

09:05-21:13

2 stops17h 08m

Baltimore/Washington

Tue 8/9

06:17-08:45

2 stops21h 28m

£652

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 29/10

08:40-23:04

2 stops18h 24m

Baltimore/Washington

Thu 5/11

12:15-08:10

2 stops14h 55m

£653

Flights are sorted by cheapest return flights first.

Deals found on 21/7

Showing 1-10 of 46 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 23 July 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 23 July 2026.

The most flights from P0R to WAS are scheduled on a Tuesday (29 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 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 17h 13m. Aer Lingus provides one of the quickest options available for as low as £650. The distance from Portsmouth to Washington, D.C. is about 3597 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 (85%), Austrian Airlines (85%) or Copa Airlines (85%) 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 £1,515 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £374 while the most popular route, (Southampton Eastleigh - Baltimore/Washington) is currently priced at £650.

  • 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
Gaithersburg
Oxon Hill
Hanover
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 23 July 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£325Average£466FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£334Average£528FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
TAP AIR PORTUGALCheapest£350Average£449FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£365Average£594FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
KLMCheapest£378Average£566FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£405Average£556FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£407Average£543FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£408Average£552FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Scandinavian AirlinesCheapest£411Average£484FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Austrian AirlinesCheapest£419Average£559FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines 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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