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Cheap flights from Portsmouth to Washington, D.C. from £365

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — WAS
20 Jun — 27 Jun1
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 21 May 2026.

Tue 16/609:20
SOU
-
IAD
1 stop11h 25m
Aer Lingus
Tue 23/621:10
IAD
-
SOU
1 stop17h 20m
Aer Lingus
Deal found 19/5£618
Thu 3/909:20
SOU
-
IAD
2 stops15h 00m
Multiple Airlines
Thu 17/920:30
IAD
-
SOU
2 stops18h 00m
Multiple Airlines
Deal found 16/5£699
Tue 9/618:10
SOU
-
IAD
3 stops31h 19m
Multiple Airlines
Mon 15/608:18
IAD
-
SOU
3 stops27h 32m
Multiple Airlines
Deal found 18/5£722
Tue 9/618:10
SOU
-
DCA
3 stops30h 48m
Multiple Airlines
Mon 15/606:00
DCA
-
SOU
3 stops29h 50m
Multiple Airlines
Deal found 18/5£743
Tue 16/609:20
SOU
-
DCA
3 stops31h 41m
Multiple Airlines
Tue 23/620:40
DCA
-
SOU
2 stops17h 50m
Multiple Airlines
Deal found 19/5£749
Wed 17/615:35
SOU
-
DCA
2 stops23h 43m
Multiple Airlines
Wed 24/606:00
DCA
-
SOU
3 stops32h 30m
Multiple Airlines
Deal found 19/5£766
Tue 16/609:20
SOU
-
IAD
2 stops17h 06m
Multiple Airlines
Tue 23/608:18
IAD
-
SOU
3 stops30h 12m
Multiple Airlines
Deal found 19/5£773
Thu 29/1009:20
SOU
-
IAD
1 stop11h 15m
Aer Lingus
Thu 5/1117:05
IAD
-
SOU
1 stop18h 30m
Aer Lingus
Deal found 17/5£790
Wed 17/615:35
SOU
-
IAD
3 stops24h 11m
Multiple Airlines
Wed 24/608:18
IAD
-
SOU
3 stops30h 12m
Multiple Airlines
Deal found 19/5£791
Thu 3/917:20
SOU
-
IAD
1 stop27h 15m
KLM
Thu 17/912:30
IAD
-
SOU
2 stops15h 05m
KLM
Deal found 16/5£793
Thu 29/1008:40
SOU
-
BWI
2 stops30h 28m
KLM
Thu 5/1113:00
BWI
-
SOU
2 stops14h 10m
KLM
Deal found 17/5£816
Wed 2/906:50
SOU
-
BWI
2 stops15h 25m
British Airways
Sun 6/921:35
BWI
-
SOU
2 stops18h 20m
British Airways
Deal found 17/5£856

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 21 May 2026.

Round-trip from

£618

One-way from

£365

Popular in

July

Cheapest in

February

Average price

£553
Aer Lingus
  • Aer Lingus
  • 16/6-23/6
  • 2 total stops
  • 28h 45m total
  • Portsmouth to Washington, D.C.
Search Deals
23/8
  • 23/8
  • 3 total stops
  • 52h 06m 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 (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 21 May 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 3/9

09:20-19:20

2 stops15h 00m

Washington, D.C. Dulles Intl

Thu 17/9

20:30-19:30

2 stops18h 00m

£699

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 9/6

18:10-20:29

3 stops31h 19m

Washington, D.C. Dulles Intl

Mon 15/6

08:18-16:50

3 stops27h 32m

£722

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Tue 9/6

18:10-19:58

3 stops30h 48m

Washington, D.C. Reagan-National

Mon 15/6

06:00-16:50

3 stops29h 50m

£743

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Tue 16/6

09:20-12:01

3 stops31h 41m

Washington, D.C. Reagan-National

Tue 23/6

20:40-19:30

2 stops17h 50m

£749

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Wed 17/6

15:35-10:18

2 stops23h 43m

Washington, D.C. Reagan-National

Wed 24/6

06:00-19:30

3 stops32h 30m

£766

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

17:05-16:35

1 stop18h 30m

£790

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 29/10

17:30-16:55

1 stop27h 25m

Washington, D.C. Dulles Intl

Thu 5/11

12:30-08:10

2 stops14h 40m

£813

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 29/10

08:40-11:08

2 stops30h 28m

Baltimore/Washington

Thu 5/11

13:00-08:10

2 stops14h 10m

£816
Fastest return journey

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

17:45-08:10

1 stop9h 25m

£818

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Wed 2/9

06:50-17:15

2 stops15h 25m

Baltimore/Washington

Sun 6/9

21:35-20:55

2 stops18h 20m

£856

Flights are sorted by cheapest return flights first.

Deals found on 16/5

Showing 1-10 of 47 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 21 May 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 21 May 2026.

The most flights from P0R to WAS are scheduled on a Monday (28 on average). You will have fewer flight options on Thursday, 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 15m. Aer Lingus provides one of the quickest options available for as low as £790. 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 (88%), Austrian Airlines (88%) or Copa Airlines (88%) 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 £769 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £486 while the most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl) is currently priced at £818.

  • 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
Arlington
Alexandria

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 21 May 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£295Average£576FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
IcelandairCheapest£328Average£506FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£332Average£405FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Aer LingusCheapest£364Average£666FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
KLMCheapest£377Average£557FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£399Average£573FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£403Average£582FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£406Average£555FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£408Average£528FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£410Average£570FlexibilityNo cancel feeOn-time70%
Search British Airways 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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