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Cheap flights from Portsmouth to Washington from £479

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 22/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
23 Aug — 30 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Washington

Enter your travel dates to find the best prices.

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 24 July 2026.

Tue 1/909:15
SOU
-
SEA
1 stop15h 55m
Aer Lingus
Tue 8/919:10
SEA
-
SOU
1 stop16h 20m
Aer Lingus
Deal found 23/7£616
Tue 1/917:20
SOU
-
SEA
1 stop26h 27m
Virgin Atlantic
Tue 8/923:08
SEA
-
SOU
2 stops25h 27m
Virgin Atlantic
Deal found 23/7£676
Tue 1/909:05
SOU
-
SEA
2 stops21h 00m
Delta
Tue 8/907:15
SEA
-
SOU
2 stops17h 30m
Delta
Deal found 23/7£680
Sun 6/909:15
SOU
-
SEA
1 stop15h 20m
Delta
Fri 11/923:59
SEA
-
SOU
2 stops24h 46m
Delta
Deal found 23/7£706
Sun 6/909:15
SOU
-
SEA
1 stop15h 20m
Delta
Sat 12/910:35
SEA
-
SOU
2 stops14h 10m
Delta
Deal found 23/7£748
Sun 13/1209:30
SOU
-
SEA
2 stops39h 23m
Delta
Tue 5/123:05
SEA
-
SOU
2 stops25h 05m
Delta
Deal found 20/7£775
Fri 7/809:15
SOU
-
SEA
1 stop15h 12m
Delta
Sat 5/917:45
SEA
-
SOU
1 stop30h 50m
Delta
Deal found 19/7£795
Fri 7/809:15
SOU
-
SEA
2 stops19h 20m
Delta
Thu 3/917:45
SEA
-
SOU
1 stop31h 00m
Delta
Deal found 19/7£799
Tue 15/1217:30
SOU
-
SEA
1 stop26h 20m
Delta
Tue 5/123:05
SEA
-
SOU
2 stops25h 05m
Delta
Deal found 20/7£817
Thu 29/1006:50
SOU
-
SEA
2 stops18h 00m
British Airways
Mon 2/1118:45
SEA
-
SOU
2 stops31h 00m
British Airways
Deal found 22/7£829

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 24 July 2026.

Round-trip from

£616

One-way from

£479

Popular in

December

Cheapest in

February

Average price

£632
Aer Lingus
  • Aer Lingus
  • 1/9-8/9
  • 2 total stops
  • 32h 15m total
  • Portsmouth to Washington
Search Deals
British Airways
  • British Airways
  • 22/10
  • 1 total stop
  • 15h 50m total
  • Portsmouth to Washington
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
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 24 July 2026.
Use the filters below to find and compare flights from Portsmouth to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 1/9

17:20-11:47

1 stop26h 27m

Seattle/Tacoma Intl

Tue 8/9

23:08-08:35

2 stops25h 27m

£676

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 1/9

09:05-22:05

2 stops21h 00m

Seattle/Tacoma Intl

Tue 8/9

07:15-08:45

2 stops17h 30m

£680

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 8/8

09:15-11:37

1 stop34h 22m

Seattle/Tacoma Intl

Thu 3/9

13:50-08:45

1 stop34h 55m

£795

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 8/8

09:15-11:37

1 stop34h 22m

Seattle/Tacoma Intl

Sat 5/9

17:45-08:35

1 stop30h 50m

£795

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 31/10

08:55-17:50

2 stops39h 55m

Seattle/Tacoma Intl

Wed 4/11

18:45-09:45

2 stops31h 00m

£842

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 11/9

09:05-16:35

1 stop15h 30m

Seattle/Tacoma Intl

Sat 12/9

23:59-16:50

2 stops32h 51m

£846

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 10/9

17:20-16:35

1 stop31h 15m

Seattle/Tacoma Intl

Sat 12/9

23:59-16:50

2 stops32h 51m

£846
Fastest return journey

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 18/8

09:15-17:10

1 stop15h 55m

Seattle/Tacoma Intl

Fri 28/8

19:10-16:50

1 stop13h 40m

£849

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 18/8

09:15-17:10

1 stop15h 55m

Seattle/Tacoma Intl

Sat 29/8

19:10-16:50

1 stop13h 40m

£849

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 9/9

17:20-16:45

2 stops31h 25m

Seattle/Tacoma Intl

Sat 12/9

23:59-16:50

2 stops32h 51m

£849

Flights are sorted by cheapest return flights first.

Deals found on 23/7

Showing 1-10 of 15 resultsSorted by cheapest first
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 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 24 July 2026.

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 24 July 2026.

The most flights from P0R to USWA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (13 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 21h. 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 (88%), KLM (79%) or Air France (79%) 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 £1,557, our data indicates the cheapest price to be £336. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £616.

  • 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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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 24 July 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£336Average£530FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£343Average£504FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£393Average£622FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£426Average£756FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£433Average£644FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£439Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£443Average£648FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£453Average£641FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£459Average£642FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£473Average£569FlexibilityNo cancel feeOn-time75%
Search Alaska 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?

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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