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Cheap flights from Portsmouth to Seattle from £506

LHR — SEA
12 Oct — 19 Oct1
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

Mon 5/1009:20 -
1 stop15h 50m
Wed 21/1019:10 -
1 stop13h 40m
Deal found 10/9£514
Wed 14/1009:20 -
1 stop15h 50m
Sun 18/1019:10 -
1 stop13h 40m
Deal found 11/9£543
Mon 5/1009:05 -
1 stop15h 30m
Wed 21/1013:30 -
2 stops19h 20m
Deal found 12/9£558

Find flight deals from Portsmouth to Seattle

Round-trip from

£514

One-way from

£506

Popular in

August

Cheapest in

February

Average price

£546
British Airways
  • British Airways
  • 5/10-21/10
  • 2 total stops
  • 29h 30m total
  • Portsmouth to Seattle
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British Airways
  • British Airways
  • 27/12-31/12
  • 2 total stops
  • 28h 00m total
  • Portsmouth to Seattle
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£27 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
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Average for round-trip flights in September 2026
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Cheapflights Fare Finder

 
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 Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Sun 27/12

20:50-16:50

2 stops28h 00m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£506
Fastest return journey

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Mon 9/11

19:55-11:25

2 stops23h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£508

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Mon 5/10

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Wed 21/10

19:10-16:50

1 stop13h 40m

£514

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Mon 28/12

06:50-11:25

2 stops36h 35m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£517

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Sat 26/12

19:55-16:50

2 stops28h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£519

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Wed 14/10

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Sun 18/10

19:10-16:50

1 stop13h 40m

£543

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Mon 5/10

09:05-16:35

1 stop15h 30m

Seattle/Tacoma Intl

Wed 21/10

13:30-16:50

2 stops19h 20m

£558

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Wed 7/10

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Sat 17/10

19:10-16:50

1 stop13h 40m

£721

SouthamptonSeattle

SOU Southampton Eastleigh - SEA Seattle/Tacoma Intl

SOUSEA

Southampton Eastleigh

Mon 26/10

15:15-12:25

2 stops28h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£910

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Sorted by cheapest first

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

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?

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

The most flights from P0R to SEA 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 (18 on average).

Related info for your journey

  • 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. 12 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 £514, British Airways can have you in Seattle from Portsmouth in 15h 50m. 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: SAUDIA (79%), Scandinavian Airlines (78%), KLM( 75%).

  • What are the cheapest flights from Portsmouth to Seattle?

    Looking for the cheapest flight from Portsmouth to Seattle? While on average our users pay £1,818, our data indicates the cheapest price to be £314. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £514.

  • 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
Federal Way
SeaTac

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Portsmouth to Seattle

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£332Average£510FlexibilityNo cancel feeOn-time76%
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IcelandairCheapest£333Average£510FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
United AirlinesCheapest£367Average£485FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£388Average£634FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£395Average£644FlexibilityNo cancel feeOn-timeN/A
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Virgin AtlanticCheapest£413Average£591FlexibilityNo cancel feeOn-time72%
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Air FranceCheapest£426Average£608FlexibilityNo cancel feeOn-time77%
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KLMCheapest£429Average£608FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£447Average£626FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£451Average£591FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

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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