HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portsmouth

$355+ Cheap flights from Washington, D.C. (WAS) to Portsmouth, England

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 1/15. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — LHR
ene. 16 — ene. 231
vie. 1/16
vie. 1/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington, D.C. to Portsmouth with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Washington, D.C. to Portsmouth

Cheapest flights from Washington, D.C. to Portsmouth
Explore the most affordable flight options available from Washington, D.C. to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 17, 2025.

This KLM deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/296:05 pmIAD - SOU
1 stop17h 55mKLM
dom. 1/115:45 pmSOU - IAD
2 stops30h 24mKLM
Deal found 12/16$766
This Delta deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/292:25 pmDCA - SOU
2 stops21h 35mDelta
dom. 1/115:45 pmSOU - DCA
2 stops33h 15mDelta
Deal found 12/16$775
This Booking.com deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/296:05 pmIAD - SOU
1 stop17h 55mMultiple Airlines
dom. 1/115:45 pmSOU - IAD
1 stop27h 20mMultiple Airlines
Deal found 12/16$933
This Delta deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/294:55 pmIAD - SOU
2 stops19h 05mDelta
dom. 1/115:45 pmSOU - IAD
2 stops30h 24mDelta
Deal found 12/16$999
This Mytrip deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/296:00 amDCA - SOU
3 stops27h 10mMultiple Airlines
dom. 1/118:10 pmSOU - DCA
2 stops28h 35mMultiple Airlines
Deal found 12/16$1,584
This British Airways deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/189:00 pmIAD - SOU
1 stop13h 35mBritish Airways
mar. 12/307:55 pmSOU - IAD
2 stops29h 00mBritish Airways
Deal found 12/15$4,072
This British Airways deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/175:05 pmIAD - SOU
1 stop10h 40mBritish Airways
mar. 12/237:55 pmSOU - IAD
2 stops24h 40mBritish Airways
Deal found 12/16$4,076

Find flight deals from Washington, D.C. to Portsmouth

Keep the following information in mind while searching for Washington, D.C. to Portsmouth flight deals. Data was last updated diciembre 17, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$766
(KLM)

One-way from

$355
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$978
Provider with most accurate pricing for Washington, D.C. (WAS)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-London (LON) flights.
Search Deals
From Washington, D.C. (WAS) to Portsmouth
Search Deals
One-way flight from Washington, D.C. (WAS) to Portsmouth
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Portsmouth 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 2,558,603 searches. Data last updated diciembre 17, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Portsmouth that are best for you.

Fly from

Washington, D.C.

Fly to

Portsmouth

Route

Depart

Return

Price

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

lun. 12/29

6:05 pm-5:00 pm

1 stop17h 55m

Southampton Eastleigh

dom. 1/11

5:45 pm-7:09 pm

2 stops30h 24m

$766

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

sáb. 1/31

5:27 pm-5:15 pm

2 stops18h 48m

Southampton Eastleigh

sáb. 2/7

9:25 am-4:05 pm

1 stop11h 40m

$772

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 1/30

12:32 pm-8:45 am

2 stops15h 13m

Southampton Eastleigh

vie. 2/6

5:35 pm-4:05 pm

1 stop27h 30m

$772

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

jue. 1/29

12:32 pm-8:25 am

2 stops14h 53m

Southampton Eastleigh

jue. 2/5

9:00 am-4:05 pm

1 stop12h 05m

$772

Washington, D.C.Southampton

DCA - SOU

DCASOU

Washington, D.C. Reagan-National

lun. 12/29

2:25 pm-5:00 pm

2 stops21h 35m

Southampton Eastleigh

dom. 1/11

5:45 pm-10:00 pm

2 stops33h 15m

$775

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

jue. 1/29

11:45 am-8:25 am

2 stops15h 40m

Southampton Eastleigh

jue. 2/5

9:00 am-10:02 pm

2 stops18h 02m

$782

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

jue. 1/29

7:40 pm-5:10 pm

2 stops16h 30m

Southampton Eastleigh

jue. 2/5

8:10 pm-9:00 pm

3 stops29h 50m

$788

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

vie. 1/30

11:35 am-2:50 pm

3 stops22h 15m

Southampton Eastleigh

vie. 2/6

7:50 pm-3:15 pm

2 stops24h 25m

$842

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

dom. 5/17

5:40 pm-8:35 am

1 stop9h 55m

Southampton Eastleigh

sáb. 5/30

9:15 am-3:35 pm

1 stop11h 20m

$918

Washington, D.C.Southampton

IAD - SOU

IADSOU

Washington, D.C. Dulles Intl

lun. 5/18

6:10 pm-8:35 am

1 stop9h 25m

Southampton Eastleigh

dom. 5/31

9:15 am-3:35 pm

1 stop11h 20m

$918

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 34 results
1
2
3
4

Best time to book a flight from Washington, D.C. to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Washington, D.C. with our price prediction graph.
Estimated round-trip 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 Washington, D.C. to Portsmouth

What is the cheapest month to book a flight from Washington, D.C. to Portsmouth?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. to Portsmouth (average of $31). Flying from Washington, D.C. to Portsmouth in June is currently the most expensive (average of $725). 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 WAS to P0R?

Find hourly flight availability from Washington, D.C. to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated diciembre 17, 2025.

One of the essential ways to save on airfare from Washington, D.C. to Portsmouth is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 14% on airfare.

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

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

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

Weekly flight availability from Washington, D.C. to Portsmouth

Explore weekly flight availability from Washington, D.C. to Portsmouth. 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 diciembre 17, 2025.

The most flights from WAS to P0R are scheduled on a Monday (26 on average). You will have fewer flight options on Sunday, 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 Washington, D.C. to Portsmouth. 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 Washington, D.C. to Portsmouth?

    Airlines like KLM, Delta, and Aer Lingus fly from Washington, D.C. to Portsmouth in about 17h. The time it takes to get you to your destination can typically vary by up to 1h 48m. Airlines will cover a distance of 3597 mi. This flight may include one or multiple stops.

  • What are the most popular routes from Washington, D.C. to Portsmouth?

    The most popular flight routes from Washington, D.C. to Portsmouth are Washington, D.C. Dulles Intl - Southampton Eastleigh, Baltimore/Washington - Southampton Eastleigh and Washington, D.C. Reagan-National - Southampton Eastleigh.

  • What are the most reliable airlines from Washington, D.C. to Portsmouth?

    No one likes to see their flight delayed. When booking a flight from Washington, D.C. to Portsmouth consider choosing KLM (95%), Air France (92%) or Delta (92%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Washington, D.C. to Portsmouth?

    While on average a flight from Washington, D.C. to Portsmouth is generally $2,133, our data shows the cheapest flight currently is $350. When looking at the most popular route, (Washington, D.C. Dulles Intl - Southampton Eastleigh), you can expect to pay $766 for that flight.

  • Can I find deals for flights from Washington, D.C. to Portsmouth that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Portsmouth flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Portsmouth?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Portsmouth.

  • Can I find deals for business class flights from Washington, D.C. to Portsmouth?

    Yes. Cheapflights offers flight deals from Washington, D.C. to Portsmouth 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 Washington, D.C. to Portsmouth?

    Currently, March is the cheapest month in which you can book a flight from Washington, D.C. to Portsmouth (average of $31). Flying from Washington, D.C. to Portsmouth in June is currently the most expensive (average of $725). 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

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.

Alternative routes for Washington, D.C. to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Heathrow flights
Reagan-National to Heathrow flights
Dulles Intl to Gatwick flights
Dulles Intl to London City flights
Dulles Intl to Stansted flights
Reagan-National to Gatwick flights
Dulles Intl to Edinburgh flights
Dulles Intl to Luton flights
Reagan-National to Edinburgh flights
Reagan-National to Luton flights
Dulles Intl to Manchester flights
Reagan-National to Manchester flights
Reagan-National to London City flights
Reagan-National to Stansted flights
Dulles Intl to Leeds flights
Dulles Intl to Birmingham flights
Dulles Intl to Newcastle upon Tyne flights
Reagan-National to Leeds flights
Dulles Intl to Liverpool flights
Dulles Intl to Southampton flights
Reagan-National to Birmingham flights
Reagan-National to Newcastle upon Tyne flights
Reagan-National to Liverpool flights
Dulles Intl to Bristol flights
Dulles Intl to Newquay flights
Reagan-National to Bristol flights
Reagan-National to Southampton flights
Dulles Intl to Southend flights
Dulles Intl to Exeter flights
Reagan-National to Newquay flights
Reagan-National to East Midlands flights
Dulles Intl to East Midlands flights
Dulles Intl to Doncaster flights
Dulles Intl to Bournemouth flights

Top 10 airlines flying from Washington, D.C. to Portsmouth

Discover the top 10 airlines that operate flights from Washington, D.C. to Portsmouth. 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 2,558,603 searches. Data last updated diciembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$31Average$802FlexibilityNo cancel feeOn-time62%
PLAYCheapest$369Average$511FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$395Average$566FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$427Average$630FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$429Average$593FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$447Average$1,061FlexibilityNo cancel feeOn-time76%
Virgin AtlanticCheapest$497Average$842FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$497Average$845FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$506Average$837FlexibilityNo cancel feeOn-time69%
KLMCheapest$520Average$615FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.