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Cheap flights from Portsmouth to Washington, D.C. from £500

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — WAS
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 31 October 2025.

Tue 25/1108:40SOU - BWI
2 stops19h 20mDelta
Tue 9/1216:49BWI - SOU
2 stops19h 11mDelta
Deal found 30/10£509
Tue 25/1108:40SOU - IAD
1 stop12h 25mKLM
Tue 9/1218:50IAD - SOU
2 stops17h 10mKLM
Deal found 30/10£556
Tue 25/1117:30SOU - IAD
1 stop27h 35mVirgin Atlantic
Tue 9/1218:05IAD - SOU
1 stop17h 55mVirgin Atlantic
Deal found 30/10£571
Tue 25/1117:30SOU - BWI
3 stops30h 10mMultiple Airlines
Tue 9/1219:40BWI - SOU
2 stops14h 55mMultiple Airlines
Deal found 30/10£572
Tue 25/1112:25SOU - IAD
1 stop12h 05mAer Lingus
Tue 9/1217:05IAD - SOU
1 stop17h 30mAer Lingus
Deal found 30/10£577
Tue 25/1117:30SOU - IAD
3 stops30h 00mMultiple Airlines
Tue 9/1219:40IAD - SOU
2 stops14h 55mMultiple Airlines
Deal found 30/10£591
Sat 13/1209:30SOU - IAD
1 stop15h 00mAer Lingus
Sat 20/1217:05IAD - SOU
1 stop17h 30mAer Lingus
Deal found 29/10£625
Tue 25/1108:40SOU - DCA
2 stops17h 01mVirgin Atlantic
Tue 9/1212:32DCA - SOU
2 stops14h 38mVirgin Atlantic
Deal found 30/10£633
Tue 25/1120:10SOU - DCA
2 stops26h 55mMultiple Airlines
Tue 9/1211:05DCA - SOU
3 stops19h 50mMultiple Airlines
Deal found 30/10£656
Sat 13/1209:30SOU - IAD
1 stop15h 00mMultiple Airlines
Sat 20/1217:05IAD - SOU
2 stops34h 05mMultiple Airlines
Deal found 29/10£837
Sun 14/1218:05SOU - BWI
2 stops35h 14mVirgin Atlantic
Sun 21/1217:36BWI - SOU
2 stops33h 34mVirgin Atlantic
Deal found 30/10£862
Thu 20/1109:30SOU - IAD
1 stop15h 00mBritish Airways
Mon 1/1221:00IAD - SOU
1 stop13h 35mBritish Airways
Deal found 30/10£864

Cheap 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 31 October 2025.

Round-trip from

£500

Popular in

July

Cheapest in

February

Average price

£565
Delta
  • Delta
  • 1/4-5/4
  • 4 total stops
  • 53h 47m total
  • Portsmouth to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£53 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
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 31 October 2025.
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

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Wed 1/4

17:35-20:32

2 stops31h 57m

Baltimore/Washington

Sun 5/4

06:00-08:50

2 stops21h 50m

£500

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Tue 25/11

08:40-23:00

2 stops19h 20m

Baltimore/Washington

Tue 9/12

16:49-17:00

2 stops19h 11m

£509

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 1/4

17:35-15:35

1 stop27h 00m

Washington, D.C. Dulles Intl

Sun 5/4

17:50-08:50

1 stop10h 00m

£553

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 25/11

08:40-16:05

1 stop12h 25m

Washington, D.C. Dulles Intl

Tue 9/12

18:50-17:00

2 stops17h 10m

£556

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Wed 1/4

09:20-23:33

2 stops19h 13m

Washington, D.C. Reagan-National

Sun 5/4

12:00-08:50

2 stops15h 50m

£557

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Wed 1/4

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Sun 5/4

17:50-08:50

1 stop10h 00m

£562

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Tue 25/11

17:30-18:40

3 stops30h 10m

Baltimore/Washington

Tue 9/12

19:40-15:35

2 stops14h 55m

£572

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 25/11

12:25-19:30

1 stop12h 05m

Washington, D.C. Dulles Intl

Tue 9/12

17:05-15:35

1 stop17h 30m

£577

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Tue 25/11

17:30-18:30

3 stops30h 00m

Washington, D.C. Dulles Intl

Tue 9/12

19:40-15:35

2 stops14h 55m

£591

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Tue 25/11

08:40-20:41

2 stops17h 01m

Washington, D.C. Reagan-National

Tue 9/12

12:32-08:10

2 stops14h 38m

£633

Flights are sorted by cheapest return flights first.

Deals found on 29/10

Showing 1-10 of 19 results
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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, February is the cheapest month in which you can book a flight from Portsmouth to Washington, D.C. (average of £231). Flying from Portsmouth to Washington, D.C. in July is currently the most expensive (average of £486). 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 31 October 2025.

When flying from Portsmouth to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 19% versus a flight at midday.

What is the cheapest day to fly from Portsmouth to Washington, D.C.?

Use this chart to determine the cheapest time to fly return from Portsmouth to Washington, D.C.. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their Portsmouth to Washington, D.C. flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 31 October 2025.
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
1,365 reviews
Check prices

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Boarding

7.4

Reviews

1 / 20
6.0
Good

David,Oct 2025

DUB - IAD

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight from Dublin to Washington (Flight EI 119 on October 25, 2025) one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. Beyond being firm and actually nasty and rude. A little interpersonal communication training could help this man.
Aer Lingus
7.2
Good
1,365 reviews
Aer Lingus
7.2
Good
1,365 reviews
Check prices

Food

6.6

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Boarding

7.4

Reviews

1 / 20
6.0
Good

David,Oct 2025

DUB - IAD

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight from Dublin to Washington (Flight EI 119 on October 25, 2025) one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. Beyond being firm and actually nasty and rude. A little interpersonal communication training could help this man.

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 25m. Delta provides one of the quickest options available for as low as £556. 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 KLM (89%), Air France (89%) or Delta (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 £1,522 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £416 while the most popular route, (Southampton Eastleigh - Washington, D.C. Dulles Intl) is currently priced at £515.

  • 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 £231). Flying from Portsmouth to Washington, D.C. in July is currently the most expensive (average of £486). 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
Tysons

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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.
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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 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£192Average£527FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£273Average£400FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
IcelandairCheapest£352Average£520FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£360Average£500FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
JetBlueCheapest£389Average£628FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Aer LingusCheapest£395Average£713FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£413Average£571FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£428Average£646FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
FinnairCheapest£430Average£655FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Scandinavian AirlinesCheapest£440Average£589FlexibilityNo cancel feeOn-time77%
Search Scandinavian 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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