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Cheap flights from Portsmouth to Washington, D.C. from £359

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 15/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — WAS
17 Oct — 24 Oct1
1 adult
1 adult, Economy

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 17 September 2025.

Round-trip from

£461

One-way from

£359

Popular in

July

Cheapest in

February

Average price

£488
Virgin Atlantic
  • Virgin Atlantic
  • 13/10-20/10
  • 2 total stops
  • 45h 25m total
  • Portsmouth to Washington, D.C.
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15/11
  • 15/11
  • 3 total stops
  • 42h 24m total
  • Portsmouth to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£48 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 September 2025
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Find flight deals from Portsmouth to Washington, D.C.

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 September 2025.

Mon 13/1017:35SOU - IAD
1 stop27h 00mVirgin Atlantic
Mon 20/1017:25IAD - SOU
1 stop18h 25mVirgin Atlantic
Deal found 15/9£461
Mon 13/1017:35SOU - BWI
2 stops28h 19mKLM
Mon 20/1013:00BWI - SOU
2 stops14h 45mKLM
Deal found 15/9£479
Thu 30/1008:50SOU - IAD
1 stop12h 15mKLM
Thu 6/1118:05IAD - SOU
1 stop17h 55mKLM
Deal found 15/9£488
Thu 30/1008:50SOU - IAD
1 stop12h 15mVirgin Atlantic
Thu 6/1112:09IAD - SOU
2 stops14h 56mVirgin Atlantic
Deal found 15/9£488
Mon 13/1017:35SOU - IAD
1 stop27h 00mKLM
Mon 20/1013:00IAD - SOU
2 stops14h 45mKLM
Deal found 15/9£497
Thu 30/1008:50SOU - DCA
2 stops18h 09mDelta
Thu 6/1111:10DCA - SOU
2 stops15h 55mDelta
Deal found 15/9£497
Thu 30/1018:05SOU - BWI
3 stops29h 35mMultiple Airlines
Thu 6/1119:40BWI - SOU
2 stops19h 00mMultiple Airlines
Deal found 15/9£609
Mon 13/1020:30SOU - IAD
3 stops47h 50mMultiple Airlines
Mon 20/1009:45IAD - SOU
3 stops28h 45mMultiple Airlines
Deal found 15/9£611
Thu 30/1020:10SOU - IAD
2 stops29h 50mMultiple Airlines
Thu 6/1117:30IAD - SOU
3 stops20h 50mMultiple Airlines
Deal found 15/9£729
Thu 30/1020:10SOU - DCA
2 stops27h 35mMultiple Airlines
Thu 6/1106:59DCA - SOU
3 stops27h 51mMultiple Airlines
Deal found 15/9£745
Mon 13/1008:05SOU - BWI
3 stops38h 35mMultiple Airlines
Mon 20/1018:50BWI - SOU
3 stops32h 55mMultiple Airlines
Deal found 15/9£794
Tue 16/908:40SOU - IAD
2 stops16h 30mBritish Airways
Mon 6/1020:25IAD - SOU
1 stop18h 05mBritish Airways
Deal found 15/9£1,351

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 September 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

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 13/10

17:35-15:35

1 stop27h 00m

Washington, D.C. Dulles Intl

Mon 20/10

17:25-16:50

1 stop18h 25m

£461

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 30/10

08:50-23:02

2 stops18h 12m

Baltimore/Washington

Thu 6/11

18:22-17:00

2 stops17h 38m

£479

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Mon 13/10

17:35-16:54

2 stops28h 19m

Baltimore/Washington

Mon 20/10

13:00-08:45

2 stops14h 45m

£479

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 30/10

08:50-17:05

1 stop12h 15m

Washington, D.C. Dulles Intl

Thu 6/11

18:05-17:00

1 stop17h 55m

£488

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 30/10

08:50-17:05

1 stop12h 15m

Washington, D.C. Dulles Intl

Thu 6/11

12:09-08:05

2 stops14h 56m

£488

SouthamptonWashington, D.C.

SOU - DCA

SOUDCA

Southampton Eastleigh

Thu 30/10

08:50-22:59

2 stops18h 09m

Washington, D.C. Reagan-National

Thu 6/11

11:10-08:05

2 stops15h 55m

£497

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 13/10

17:35-15:35

1 stop27h 00m

Washington, D.C. Dulles Intl

Mon 20/10

13:00-08:45

2 stops14h 45m

£497

SouthamptonBaltimore

SOU - BWI

SOUBWI

Southampton Eastleigh

Thu 30/10

18:05-19:40

3 stops29h 35m

Baltimore/Washington

Thu 6/11

19:40-19:40

2 stops19h 00m

£609

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Mon 13/10

20:30-15:20

3 stops47h 50m

Washington, D.C. Dulles Intl

Mon 20/10

09:45-19:30

3 stops28h 45m

£611

SouthamptonWashington, D.C.

SOU - IAD

SOUIAD

Southampton Eastleigh

Thu 30/10

20:10-22:00

2 stops29h 50m

Washington, D.C. Dulles Intl

Thu 6/11

17:30-19:20

3 stops20h 50m

£729

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 24 results
1
2
3

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 £599). Flying from Portsmouth to Washington, D.C. in July is currently the most expensive (average of £947). 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 September 2025.

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.

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 Tuesday mornings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 September 2025.

The most flights from P0R to WAS are scheduled on a Monday (28 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 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 17 September 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
1,274 reviews
Check prices

Boarding

7.3

Comfort

7.1

Crew

8.0

Overall

7.2

Food

6.5

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jul 2025

DUB - ORD

The inability to check in with the final leg of our flight via the Aers Lingus app led to a stressful trip as the final leg was overbooked and we were not able to confirm a seat until we had arrived to Chicago. Lack of earphones for the "entertainment" system were not voluntarily provided or even referenced as available (even for a charge) while boarding the plane - this seems like an oversight.
Aer Lingus
7.2
Good
1,274 reviews
Aer Lingus
7.2
Good
1,274 reviews
Check prices

Boarding

7.3

Comfort

7.1

Crew

8.0

Overall

7.2

Food

6.5

Entertainment

6.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jul 2025

DUB - ORD

The inability to check in with the final leg of our flight via the Aers Lingus app led to a stressful trip as the final leg was overbooked and we were not able to confirm a seat until we had arrived to Chicago. Lack of earphones for the "entertainment" system were not voluntarily provided or even referenced as available (even for a charge) while boarding the plane - this seems like an oversight.

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 18h 12m. Virgin Atlantic provides one of the quickest options available for as low as £479. 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 KLM (90%), Air France (90%) or Delta (90%) 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 £1,277 for a flight from Portsmouth to Washington, D.C.. The cheapest flight overall is £382 while the most popular route, (Southampton Eastleigh - Baltimore/Washington) is currently priced at £479.

  • 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 £599). Flying from Portsmouth to Washington, D.C. in July is currently the most expensive (average of £947). 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
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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Grimsby to Reagan-National flights
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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 September 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£185Average£526FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£241Average£386FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
IcelandairCheapest£342Average£495FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£348Average£502FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
JetBlueCheapest£369Average£618FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Aer LingusCheapest£392Average£689FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£393Average£604FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£427Average£604FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£430Average£613FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Scandinavian AirlinesCheapest£431Average£571FlexibilityNo 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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