Find flights
When to book
Airlines
FAQs

Cheap flights from Portsmouth to Washington from £464

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
16 Jul — 23 Jul1
1 adult

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 11 July 2025.

Round-trip from

£849

One-way from

£464

Popular in

August

Cheapest in

January

Average price

£723
KLM
  • KLM
  • 23/8-30/8
  • 3 total stops
  • 53h 39m total
  • Portsmouth to Washington
Search Deals
Aer Lingus
  • Aer Lingus
  • 7/9
  • 1 total stop
  • 29h 50m total
  • Portsmouth to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£73 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 11 July 2025.

Sat 23/809:20SOU - SEA
2 stops19h 04mKLM
Sat 30/814:10SEA - SOU
1 stop34h 35mKLM
Deal found 9/7£849
Sat 23/817:35SOU - SEA
2 stops36h 32mVirgin Atlantic
Sat 30/815:15SEA - SOU
2 stops33h 30mVirgin Atlantic
Deal found 9/7£893
Sat 23/809:40SOU - SEA
1 stop16h 10mAer Lingus
Fri 29/800:46SEA - SOU
2 stops48h 24mAer Lingus
Deal found 9/7£933
Sat 23/809:40SOU - SEA
2 stops19h 00mMultiple Airlines
Sat 30/815:45SEA - SOU
3 stops33h 00mMultiple Airlines
Deal found 9/7£1,033

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 11 July 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

Sat 23/8

09:20-20:24

2 stops19h 04m

Seattle/Tacoma Intl

Sat 30/8

14:10-08:45

1 stop34h 35m

£849

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 23/8

17:35-22:07

2 stops36h 32m

Seattle/Tacoma Intl

Sat 30/8

15:15-08:45

2 stops33h 30m

£893

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 23/8

09:40-17:50

1 stop16h 10m

Seattle/Tacoma Intl

Fri 29/8

00:46-09:10

2 stops48h 24m

£933

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 23/8

09:40-20:40

2 stops19h 00m

Seattle/Tacoma Intl

Sat 30/8

15:45-08:45

3 stops33h 00m

£1,033

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 7/9

20:00-17:50

1 stop29h 50m

£464

Flights are sorted by cheapest return flights first.

Deals found on 10/7

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 11 July 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 11 July 2025.

The most flights from P0R to USWA are scheduled on a Monday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated 11 July 2025.
See what other customers who have flown with KLM, Virgin Atlantic, andAer Lingus from Portsmouth to Washington have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,372 reviews
Check prices

Comfort

7.7

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,372 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Comfort

7.7

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Virgin Atlantic
7.4
Good
654 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Comfort

7.7

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Aer Lingus
7.1
Good
1,154 reviews
KLM
7.8
Good
1,372 reviews
Check prices

Comfort

7.7

Overall

7.8

Crew

8.4

Food

7.3

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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.

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

    Consider Aeromexico (95%), KLM (93%) or Air France (93%) 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 £2,160, our data indicates the cheapest price to be £464. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £838.

  • 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

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 Portsmouth to Washington

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Gatwick to John F Kennedy Intl flights
Gatwick to Newark flights
London City to John F Kennedy Intl flights
Heathrow to LaGuardia flights
Stansted to John F Kennedy Intl flights
Gatwick to LaGuardia flights
London City to Newark flights
Luton to John F Kennedy Intl flights
Stansted to Newark flights
Heathrow to Los Angeles flights
Heathrow to Orlando flights
London City to LaGuardia flights
Heathrow to Miami flights
Heathrow to Boston flights
Heathrow to San Francisco flights
Luton to Newark flights
Heathrow to O'Hare Intl flights
Manchester to Orlando flights
Manchester to John F Kennedy Intl flights
Heathrow to Dallas/Fort Worth flights
Heathrow to Las Vegas flights
Heathrow to Dulles Intl flights
Heathrow to Baltimore flights
Heathrow to Seattle flights
Gatwick to Orlando flights
Gatwick to Boston flights
London City to Los Angeles flights
Gatwick to Los Angeles flights
London City to Orlando flights
London City to Miami flights
Heathrow to Tampa flights
Gatwick to Miami flights
Heathrow to Atlanta flights
Gatwick to Stewart flights
Manchester to Newark flights
Luton to Stewart flights
Heathrow to Hobby flights
Heathrow to Denver flights
Manchester to LaGuardia flights
Gatwick to Las Vegas flights
Gatwick to San Francisco flights
Edinburgh to Newark flights
London City to Boston flights
London City to San Francisco flights
Heathrow to Ontario flights
Heathrow to Midway flights
Edinburgh to John F Kennedy Intl flights
Gatwick to O'Hare Intl flights

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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£7Average£655FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£321Average£492FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£381Average£562FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£381Average£540FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£394Average£572FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£399Average£552FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£401Average£597FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£418Average£985FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£437Average£692FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£439Average£774FlexibilityNo cancel feeOn-timeN/A
Search Delta 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.

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.
Site
©2025 Cheapflights