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Cheap flights from Portsmouth to Seattle

LHR — SEA
24 Oct — 31 Oct1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Portsmouth to Seattle

Popular in

August

Cheapest in

February

Average price

£553
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 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.

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.

  • 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: Scandinavian Airlines (82%), KLM (81%), SAUDIA( 81%).

  • What are the cheapest flights from Portsmouth to Seattle?

    Looking for the cheapest flight from Portsmouth to Seattle? While on average our users pay £1,879, our data indicates the cheapest price to be £360. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £544.

  • 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.

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Travelling to a place near Seattle?

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

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Top 10 airlines flying from Portsmouth to Seattle

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£338Average£520FlexibilityNo cancel feeOn-time76%
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IcelandairCheapest£339Average£520FlexibilityNo cancel feeOn-time76%
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United AirlinesCheapest£374Average£494FlexibilityNo cancel feeOn-time69%
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Aer LingusCheapest£395Average£641FlexibilityNo cancel feeOn-timeN/A
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DeltaCheapest£402Average£656FlexibilityNo cancel feeOn-timeN/A
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Air FranceCheapest£414Average£616FlexibilityNo cancel feeOn-time77%
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Virgin AtlanticCheapest£418Average£604FlexibilityNo cancel feeOn-time72%
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Alaska AirlinesCheapest£436Average£588FlexibilityNo cancel feeOn-time75%
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KLMCheapest£437Average£622FlexibilityNo cancel feeOn-time75%
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British AirwaysCheapest£453Average£643FlexibilityNo cancel feeOn-time70%
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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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