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Cheap flights from Portsmouth to Washington from £532

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
12 Oct — 19 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Portsmouth to Washington

Keep the following information in mind while searching for Portsmouth to Washington flight deals. Data was last updated 12 September 2025.

Round-trip from

£532

Popular in

August

Cheapest in

January

Average price

£512
Virgin Atlantic
  • Virgin Atlantic
  • 4/3-8/3
  • 2 total stops
  • 68h 05m total
  • Portsmouth to Washington
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£59 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Portsmouth to Washington

Cheapest flights from Portsmouth to Washington
Explore the most affordable flight options available from Portsmouth to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Wed 24/909:10SOU - SEA
1 stop16h 40mBritish Airways
Wed 1/1019:35SEA - SOU
1 stop15h 55mBritish Airways
Deal found 10/9£672
Thu 11/909:40SOU - SEA
1 stop16h 10mBritish Airways
Wed 1/1019:35SEA - SOU
1 stop15h 55mBritish Airways
Deal found 10/9£1,042
Thu 11/908:40SOU - SEA
2 stops17h 40mBritish Airways
Thu 25/919:35SEA - SOU
1 stop12h 00mBritish Airways
Deal found 10/9£1,149
Mon 13/1019:40SOU - SEA
2 stops23h 30mBritish Airways
Mon 27/1019:50SEA - SOU
2 stops17h 30mBritish Airways
Deal found 11/9£3,141
Mon 13/1008:55SOU - SEA
2 stops17h 25mBritish Airways
Tue 28/1014:25SEA - SOU
2 stops21h 05mBritish Airways
Deal found 11/9£3,262
Mon 13/1008:55SOU - SEA
2 stops17h 25mBritish Airways
Sun 26/1019:50SEA - SOU
2 stops16h 20mBritish Airways
Deal found 11/9£3,351
Sat 11/1009:20SOU - SEA
1 stop14h 45mDelta
Tue 28/1016:00SEA - SOU
1 stop18h 00mDelta
Deal found 11/9£7,942
Sat 11/1009:40SOU - SEA
1 stop16h 10mBritish Airways
Mon 27/1019:50SEA - SOU
2 stops16h 20mBritish Airways
Deal found 11/9£7,973

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Washington 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 12 September 2025.
Use the filters below to find and compare flights from Portsmouth to Washington that are best for you.

Fly from

Portsmouth

Fly to

Washington

Route

Depart

Return

Price

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/3

08:40-11:35

1 stop34h 55m

Seattle/Tacoma Intl

Sun 8/3

16:00-08:10

1 stop33h 10m

£532

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/3

17:30-11:35

1 stop26h 05m

Seattle/Tacoma Intl

Sun 8/3

07:20-08:10

2 stops41h 50m

£532

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 24/9

09:10-17:50

1 stop16h 40m

Seattle/Tacoma Intl

Wed 1/10

19:35-19:30

1 stop15h 55m

£672

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 13/10

19:40-11:10

2 stops23h 30m

Seattle/Tacoma Intl

Mon 27/10

19:50-20:20

2 stops17h 30m

£3,141

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 3/10

09:40-17:50

1 stop16h 10m

£726

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 13/10

09:20-16:05

1 stop14h 45m

£7,978

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 11/10

09:20-16:05

1 stop14h 45m

£7,978

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 12/10

09:20-16:05

1 stop14h 45m

£7,978

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 11/10

09:55-17:50

2 stops15h 55m

£10,157

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 13/10

19:40-18:20

2 stops30h 40m

£10,172

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 11 results
1
2

Best time to book a flight from Portsmouth to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington 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

What is the cheapest month to book a flight from Portsmouth to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Portsmouth to State of Washington (average of £622). Flying from Portsmouth to State of Washington in July is currently the most expensive (average of £946). 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 WA?

Find hourly flight availability from Portsmouth to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 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 State of Washington as you normally would.

Weekly flight availability from Portsmouth to State of Washington

Explore weekly flight availability from Portsmouth to Washington. 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 12 September 2025.

The most flights from P0R to USWA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 on average).

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Washington. 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 State of Washington?

    Departing from Portsmouth to State of Washington will take you 26h 05m. The distance between Portsmouth and State of Washington is about 4787 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most reliable airlines from Portsmouth to State of Washington?

    Consider Scandinavian Airlines (93%), KLM (89%) or Air France (89%) when booking your flight. These represent the most reliable airlines when flying from Portsmouth to State of Washington.

  • What are the cheapest flights from Portsmouth to State of Washington?

    Looking for the cheapest flight from Portsmouth to State of Washington? While on average our users pay £1,530, our data indicates the cheapest price to be £459. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £532.

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

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

  • How can I find direct flights from Portsmouth to Washington?

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

  • Can I find deals for business class flights from Portsmouth to Washington?

    Yes. Cheapflights offers flight deals from Portsmouth to Washington 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 State of Washington?

    Currently, January is the cheapest month in which you can book a flight from Portsmouth to State of Washington (average of £622). Flying from Portsmouth to State of Washington in July is currently the most expensive (average of £946). 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

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Alternative routes for Portsmouth to Washington

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

Discover the top 10 airlines that operate flights from Portsmouth to Washington. 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 12 September 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£323Average£495FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£381Average£569FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£392Average£537FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
FinnairCheapest£394Average£537FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£401Average£596FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£402Average£613FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£403Average£654FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£425Average£769FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£436Average£616FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£441Average£590FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Portsmouth to Washington?

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Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Washington?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Portsmouth to Washington.

Can Cheapflights find flights from Portsmouth to Washington with no change fees?

Yes, we can. To see specific flights from Portsmouth to Washington with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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Of course! You can now track prices for flights from Portsmouth to Washington and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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