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Cheap flights from Portsmouth to Washington from £386

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 23/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
27 Jan — 3 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Washington

Enter your travel dates to find the best prices.

Best flights from Portsmouth to Washington
Discover carefully curated flight deals from Portsmouth to Washington that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 December 2025.

Mon 9/217:35SOU - SEA
1 stop26h 05mVirgin Atlantic
Mon 16/206:10SEA - SOU
2 stops26h 55mVirgin Atlantic
Deal found 26/12£478
Tue 10/217:35SOU - SEA
1 stop26h 05mDelta
Tue 17/207:10SEA - SOU
2 stops17h 40mDelta
Deal found 27/12£488
Wed 21/108:55SOU - SEA
2 stops16h 00mBritish Airways
Sun 25/118:50SEA - SOU
2 stops29h 35mBritish Airways
Deal found 26/12£586
Mon 9/219:55SOU - SEA
3 stops34h 21mMultiple Airlines
Mon 16/214:35SEA - SOU
2 stops18h 55mMultiple Airlines
Deal found 26/12£746
Tue 10/217:35SOU - SEA
1 stop26h 05mVirgin Atlantic
Tue 17/215:05SEA - SOU
1 stop18h 00mVirgin Atlantic
Deal found 27/12£480

Find flight deals from Portsmouth to Washington

Keep the following information in mind while searching for Portsmouth to Washington flight deals. Data was last updated 28 December 2025.

Round-trip from

£475

One-way from

£386

Popular in

July

Cheapest in

February

Average price

£632
Virgin Atlantic
  • Virgin Atlantic
  • 10/2-17/2
  • 4 total stops
  • 47h 30m total
  • Portsmouth to Washington
Search Deals
Aer Lingus
  • Aer Lingus
  • 23/3
  • 1 total stop
  • 16h 50m total
  • Portsmouth to Washington
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£59 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 December 2025
Search Deals

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 28 December 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

Mon 9/2

17:35-11:40

1 stop26h 05m

Seattle/Tacoma Intl

Mon 16/2

06:10-17:05

2 stops26h 55m

£478

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 10/2

17:35-11:40

1 stop26h 05m

Seattle/Tacoma Intl

Tue 17/2

15:05-17:05

1 stop18h 00m

£480

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 10/2

17:35-11:40

1 stop26h 05m

Seattle/Tacoma Intl

Tue 17/2

07:10-08:50

2 stops17h 40m

£488

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 21/1

08:55-16:55

2 stops16h 00m

Seattle/Tacoma Intl

Sun 25/1

18:50-08:25

2 stops29h 35m

£586

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 9/2

19:55-22:16

3 stops34h 21m

Seattle/Tacoma Intl

Mon 16/2

14:35-17:30

2 stops18h 55m

£746

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 23/3

09:30-19:20

1 stop16h 50m

£386

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 5/4

20:00-16:59

1 stop28h 59m

£530

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 6/4

09:10-16:59

1 stop15h 49m

£543

Flights are sorted by cheapest return flights first.

Deals found on 26/12

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, March is the cheapest month in which you can book a flight from Portsmouth to State of Washington (average of £302). Flying from Portsmouth to State of Washington in August is currently the most expensive (average of £457). 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 28 December 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 28 December 2025.

The most flights from P0R to USWA are scheduled on a Saturday (21 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (6 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.

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

    Consider Scandinavian Airlines (97%), Air France (93%) or Delta (90%) 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 £1,656, our data indicates the cheapest price to be £409. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £475.

  • 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, March is the cheapest month in which you can book a flight from Portsmouth to State of Washington (average of £302). Flying from Portsmouth to State of Washington in August is currently the most expensive (average of £457). 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 28 December 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£323Average£476FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£384Average£610FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapest£392Average£604FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£393Average£542FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£403Average£603FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£409Average£577FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Aer LingusCheapest£415Average£666FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£433Average£614FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£435Average£595FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£442Average£579FlexibilityNo 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?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Washington from Portsmouth today with Cheapflights!

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.

Can Cheapflights notify me if prices for flights from Portsmouth to Washington become cheaper?

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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