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Cheap flights from Portsmouth to Washington from £391

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 30/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
16 Mar — 23 Mar1
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 14 February 2026.

Mon 2/317:40
SOU
-
SEA
1 stop25h 55m
Delta
Wed 11/316:05
SEA
-
SOU
1 stop18h 20m
Delta
Deal found 13/2£686
Mon 30/309:05
SOU
-
SEA
1 stop34h 40m
KLM
Mon 6/413:45
SEA
-
SOU
1 stop34h 50m
KLM
Deal found 13/2£689
Wed 4/308:50
SOU
-
SEA
2 stops21h 15m
Delta
Wed 11/316:05
SEA
-
SOU
1 stop18h 20m
Delta
Deal found 13/2£690
Thu 5/318:05
SOU
-
SEA
1 stop25h 30m
Delta
Wed 11/316:05
SEA
-
SOU
1 stop18h 20m
Delta
Deal found 13/2£716
Wed 4/312:25
SOU
-
SEA
1 stop13h 55m
British Airways
Wed 11/321:05
SEA
-
SOU
1 stop15h 35m
British Airways
Deal found 13/2£751
Wed 4/312:25
SOU
-
SEA
1 stop13h 55m
British Airways
Mon 9/321:05
SEA
-
SOU
1 stop31h 50m
British Airways
Deal found 13/2£757
Wed 4/312:25
SOU
-
SEA
1 stop13h 55m
British Airways
Sun 15/321:05
SEA
-
SOU
1 stop15h 35m
British Airways
Deal found 13/2£781
Wed 4/312:25
SOU
-
SEA
1 stop13h 55m
British Airways
Sun 8/321:05
SEA
-
SOU
1 stop15h 35m
British Airways
Deal found 11/2£783
Sun 1/316:05
SOU
-
SEA
1 stop34h 15m
British Airways
Sun 15/321:05
SEA
-
SOU
1 stop15h 35m
British Airways
Deal found 13/2£787
Wed 18/216:05
SOU
-
SEA
2 stops32h 50m
Aer Lingus
Wed 25/220:05
SEA
-
SOU
1 stop28h 40m
Aer Lingus
Deal found 12/2£790

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 14 February 2026.

Round-trip from

£686

One-way from

£391

Popular in

July

Cheapest in

February

Average price

£466
Delta
  • Delta
  • 2/3-11/3
  • 2 total stops
  • 44h 15m total
  • Portsmouth to Washington
Search Deals
30/5
  • 30/5
  • 3 total stops
  • 41h 10m total
  • Portsmouth to Washington
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£56 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 14 February 2026.
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 2/3

17:40-11:35

1 stop25h 55m

Seattle/Tacoma Intl

Mon 9/3

05:30-17:00

2 stops28h 30m

£686

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 1/3

09:30-11:35

1 stop34h 05m

Seattle/Tacoma Intl

Mon 9/3

16:05-17:00

1 stop17h 55m

£686

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 3/3

08:50-11:35

1 stop34h 45m

Seattle/Tacoma Intl

Tue 10/3

13:30-08:20

2 stops35h 50m

£686

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 1/3

09:30-11:35

1 stop34h 05m

Seattle/Tacoma Intl

Wed 11/3

16:05-17:25

1 stop18h 20m

£686

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 3/3

17:35-11:35

1 stop26h 00m

Seattle/Tacoma Intl

Wed 11/3

16:05-17:25

1 stop18h 20m

£686

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 30/3

09:05-11:45

1 stop34h 40m

Seattle/Tacoma Intl

Mon 6/4

13:45-08:35

1 stop34h 50m

£689

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/3

08:50-22:05

2 stops21h 15m

Seattle/Tacoma Intl

Mon 9/3

16:05-17:00

1 stop17h 55m

£690

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/3

08:50-22:05

2 stops21h 15m

Seattle/Tacoma Intl

Wed 11/3

16:05-17:25

1 stop18h 20m

£690

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 6/3

17:35-11:35

1 stop26h 00m

Seattle/Tacoma Intl

Mon 9/3

16:05-17:00

1 stop17h 55m

£716

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 30/5

06:50-16:00

3 stops41h 10m

£391

Flights are sorted by cheapest return flights first.

Deals found on 12/2

Showing 1-10 of 14 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 £343). Flying from Portsmouth to State of Washington in August is currently the most expensive (average of £459). 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 14 February 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 14 February 2026.

The most flights from P0R to USWA are scheduled on a Tuesday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 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 25h 55m. 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 KLM (89%), Air France (89%) or Delta (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 £1,616, our data indicates the cheapest price to be £390. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £689.

  • 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 £343). Flying from Portsmouth to State of Washington in August is currently the most expensive (average of £459). 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 14 February 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£330Average£528FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£344Average£475FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£411Average£661FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Air CanadaCheapest£414Average£490FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£424Average£595FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£426Average£603FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£430Average£605FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£438Average£577FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air FranceCheapest£443Average£623FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£444Average£599FlexibilityNo cancel feeOn-time70%
Search British Airways 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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