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Cheap flights from Portsmouth to Seattle from £455

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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
5 Jul — 12 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Seattle
Explore the most affordable flight options available from Portsmouth to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 June 2026.

Wed 11/1109:20
SOU
-
SEA
1 stop17h 00m
British Airways
Wed 18/1120:05
SEA
-
SOU
1 stop12h 30m
British Airways
Deal found 5/6£517
Wed 1/720:00
SOU
-
SEA
1 stop29h 10m
British Airways
Wed 8/719:10
SEA
-
SOU
1 stop16h 20m
British Airways
Deal found 3/6£550
Mon 2/1109:20
SOU
-
SEA
1 stop17h 00m
British Airways
Fri 13/1120:05
SEA
-
SOU
1 stop12h 30m
British Airways
Deal found 3/6£572
Tue 3/1120:00
SOU
-
SEA
1 stop30h 20m
British Airways
Mon 9/1120:05
SEA
-
SOU
1 stop15h 25m
British Airways
Deal found 3/6£579
Fri 9/1020:00
SOU
-
SEA
1 stop29h 10m
British Airways
Tue 13/1019:10
SEA
-
SOU
1 stop29h 30m
British Airways
Deal found 3/6£592
Mon 2/1109:20
SOU
-
SEA
1 stop17h 00m
British Airways
Thu 12/1118:50
SEA
-
SOU
2 stops16h 10m
British Airways
Deal found 3/6£594
Tue 3/1120:00
SOU
-
SEA
1 stop30h 20m
British Airways
Fri 13/1118:50
SEA
-
SOU
2 stops29h 35m
British Airways
Deal found 3/6£602
Wed 4/1119:40
SOU
-
SEA
2 stops23h 50m
British Airways
Sun 8/1120:05
SEA
-
SOU
1 stop15h 25m
British Airways
Deal found 3/6£613

Find flight deals from Portsmouth to Seattle

Keep the following information in mind while searching for Portsmouth to Seattle flight deals. Data was last updated 5 June 2026.

Round-trip from

£517

One-way from

£455

Popular in

July

Cheapest in

February

Average price

£591
British Airways
  • British Airways
  • 11/11-18/11
  • 2 total stops
  • 29h 30m total
  • Portsmouth to Seattle
Search Deals
British Airways
  • British Airways
  • 4/9
  • 1 total stop
  • 15h 50m total
  • Portsmouth to Seattle
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£52 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Seattle 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 5 June 2026.
Use the filters below to find and compare flights from Portsmouth to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 7/11

17:05-18:20

1 stop33h 15m

Seattle/Tacoma Intl

Fri 13/11

20:05-16:35

1 stop12h 30m

£579

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 9/10

20:00-17:10

1 stop29h 10m

Seattle/Tacoma Intl

Tue 13/10

19:10-08:40

1 stop29h 30m

£592

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/11

09:20-18:20

1 stop17h 00m

Seattle/Tacoma Intl

Sat 7/11

18:50-19:00

2 stops16h 10m

£594

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 5/11

20:00-18:20

1 stop30h 20m

Seattle/Tacoma Intl

Tue 10/11

13:25-19:00

2 stops21h 35m

£602

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 7/11

17:05-18:20

1 stop33h 15m

Seattle/Tacoma Intl

Thu 12/11

18:50-19:00

2 stops16h 10m

£602

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/11

19:40-11:30

2 stops23h 50m

Seattle/Tacoma Intl

Wed 11/11

20:05-16:35

1 stop12h 30m

£613

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 11/11

09:20-18:20

1 stop17h 00m

Seattle/Tacoma Intl

Wed 18/11

18:50-19:30

2 stops16h 40m

£613
Fastest return journey

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 13/7

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Mon 20/7

19:10-19:30

1 stop16h 20m

£705
Cheapest one-way
Fastest single journey

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 4/9

09:20-17:10

1 stop15h 50m

£455

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 17/8

19:55-17:10

2 stops29h 15m

£549

Flights are sorted by cheapest return flights first.

Deals found on 2/6

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

Best time to book a flight from Portsmouth to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle 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 Seattle

What is the cheapest time of day to fly from P0R to SEA?

Find hourly flight availability from Portsmouth to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 June 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to Seattle as you normally would.

Weekly flight availability from Portsmouth to Seattle

Explore weekly flight availability from Portsmouth to Seattle. 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 5 June 2026.

The most flights from P0R to SEA are scheduled on a Wednesday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 on average).

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Portsmouth?

    For a flight from Portsmouth to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city. Seattle/Tacoma Intl is the only Seattle airport and it handles 0 inbound flights from Portsmouth per day. 14 airlines have flights to Seattle/Tacoma Intl from Portsmouth on a regular basis.

  • How long is the flight from Portsmouth to Seattle?

    For as low as £579, British Airways can have you in Seattle from Portsmouth in 33h 15m. The distance from Portsmouth to Seattle is about 4787 mi.

  • What are the most reliable airlines from Portsmouth to Seattle?

    Before booking your flight to Seattle from Portsmouth, check out the most reliable airlines to get you to your destination on time: KLM (88%), Air France (88%), Delta( 88%).

  • What are the cheapest flights from Portsmouth to Seattle?

    Looking for the cheapest flight from Portsmouth to Seattle? While on average our users pay £1,730, our data indicates the cheapest price to be £446. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £550.

  • Can I find deals for flights from Portsmouth to Seattle that include hotel bookings?

    Yes. In addition to deals on Portsmouth to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Portsmouth to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portsmouth to Seattle.

  • Can I find deals for business class flights from Portsmouth to Seattle?

    Yes. Cheapflights offers flight deals from Portsmouth to Seattle 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Federal Way
SeaTac

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Top 10 airlines flying from Portsmouth to Seattle

Discover the top 10 airlines that operate flights from Portsmouth to Seattle. 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 5 June 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£334Average£498FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£341Average£509FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£417Average£696FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£427Average£592FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£441Average£634FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air FranceCheapest£450Average£643FlexibilityNo cancel feeOn-time77%
Search Air France flights
DeltaCheapest£463Average£613FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapest£463Average£636FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£463Average£498FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£466Average£682FlexibilityNo cancel feeOn-time69%
Search United 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 Seattle?

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 Seattle from Portsmouth today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Seattle?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Portsmouth to Seattle for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Portsmouth to Seattle with no change fees?

Yes, we can. To see specific flights from Portsmouth to Seattle 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 Seattle become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Portsmouth today and book when prices fit your budget.

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