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Cheap flights from Portsmouth to Washington from £477

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
6 Apr — 13 Apr1
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 1 April 2025.

Round-trip from

£574

One-way from

£477

Popular in

August

Cheapest in

January

Average price

£543
KLM
  • KLM
  • 22/4-29/4
  • 2 total stops
  • 33h 45m total
  • Portsmouth to Washington
Search Deals
Aer Lingus
  • Aer Lingus
  • 7/9
  • 1 total stop
  • 28h 59m total
  • Portsmouth to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£85 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£15 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2025
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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 1 April 2025.

Tue 22/409:20SOU - SEA
1 stop14h 40mKLM
Tue 29/413:55SEA - SOU
1 stop19h 05mKLM
Deal found 1/4£574
Mon 21/409:20SOU - SEA
2 stops19h 52mDelta
Tue 29/406:20SEA - SOU
2 stops18h 25mDelta
Deal found 1/4£578
Thu 15/517:35SOU - SEA
2 stops33h 11mVirgin Atlantic
Thu 22/513:40SEA - SOU
2 stops43h 50mVirgin Atlantic
Deal found 31/3£678
Thu 15/509:40SOU - SEA
2 stops16h 10mMultiple Airlines
Thu 22/515:45SEA - SOU
3 stops33h 00mMultiple Airlines
Deal found 31/3£730
Thu 24/409:40SOU - SEA
1 stop15h 19mAer Lingus
Tue 29/418:45SEA - SOU
1 stop16h 45mAer Lingus
Deal found 1/4£756

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 1 April 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

Tue 22/4

09:20-16:00

1 stop14h 40m

Seattle/Tacoma Intl

Tue 29/4

13:55-17:00

1 stop19h 05m

£574

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 21/4

09:20-21:12

2 stops19h 52m

Seattle/Tacoma Intl

Tue 29/4

06:20-08:45

2 stops18h 25m

£578

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 15/5

17:35-18:46

2 stops33h 11m

Seattle/Tacoma Intl

Thu 22/5

13:40-17:30

2 stops43h 50m

£678

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 15/5

09:40-17:50

2 stops16h 10m

Seattle/Tacoma Intl

Thu 22/5

15:45-08:45

3 stops33h 00m

£730

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 24/4

09:40-16:59

1 stop15h 19m

Seattle/Tacoma Intl

Tue 29/4

18:45-19:30

1 stop16h 45m

£756

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 7/9

20:00-16:59

1 stop28h 59m

£477

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 25/5

18:25-15:57

1 stop29h 32m

£1,200

Flights are sorted by cheapest return flights first.

Deals found on 31/3

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 1 April 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 1 April 2025.

The most flights from P0R to USWA are scheduled on a Tuesday (21 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (11 on average).

Rainfall in Washington by month

Plan your trip to Washington by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in State of Washington ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit State of Washington when rainfall is around 18.0 mm.

Temperature in Washington by month

Plan your trip to Washington by taking into account the average temperature totals by month.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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 1 April 2025.
Delta
8.0
Very Good
7,898 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very Good
7,898 reviews
Delta
8.0
Very Good
7,898 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very Good
7,898 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Virgin Atlantic
7.4
Good
636 reviews
Delta
8.0
Very Good
7,898 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Aer Lingus
7.0
Good
1,060 reviews
Delta
8.0
Very Good
7,898 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 (98%), Singapore Airlines (98%) or KLM (92%) 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 £2,063, our data indicates the cheapest price to be £485. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £583.

  • 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 1 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£681FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£338Average£531FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£400Average£592FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£411Average£592FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£414Average£662FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£422Average£649FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£430Average£592FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£452Average£1,056FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£462Average£860FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£470Average£768FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

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