Cheap flights from Portsmouth to Seattle from £532
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
Cheap flight deals from Portsmouth to Seattle
Keep the following information in mind while searching for Portsmouth to Seattle flight deals. Data was last updated 12 September 2025.
Round-trip from | £532 |
---|---|
Popular in | August |
Cheapest in | January |
Average price | £512 |
Find flight deals from Portsmouth to Seattle
Cheapest flights from Portsmouth to SeattleExplore 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 12 September 2025.
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 12 September 2025.
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
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Wed 4/3
08:40-11:35
1 stop34h 55m
Seattle/Tacoma Intl
Sun 8/3
16:00-08:10
1 stop33h 10m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Wed 4/3
17:30-11:35
1 stop26h 05m
Seattle/Tacoma Intl
Sun 8/3
07:20-08:10
2 stops41h 50m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Wed 24/9
09:10-17:50
1 stop16h 40m
Seattle/Tacoma Intl
Wed 1/10
19:35-19:30
1 stop15h 55m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Mon 13/10
19:40-11:10
2 stops23h 30m
Seattle/Tacoma Intl
Mon 27/10
19:50-20:20
2 stops17h 30m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Fri 3/10
09:40-17:50
1 stop16h 10m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Mon 13/10
09:20-16:05
1 stop14h 45m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Sat 11/10
09:20-16:05
1 stop14h 45m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Sun 12/10
09:20-16:05
1 stop14h 45m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Sat 11/10
09:55-17:50
2 stops15h 55m
SouthamptonSeattle
SOU - SEA
SOUSEA
Southampton Eastleigh
Mon 13/10
19:40-18:20
2 stops30h 40m
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.
Cheapflights Insights
Everything you need to know about your flight from Portsmouth to Seattle
What is the cheapest month to book a flight from Portsmouth to Seattle?
Currently, January is the cheapest month in which you can book a flight from Portsmouth to Seattle (average of £622). Flying from Portsmouth to Seattle 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 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 12 September 2025.
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 12 September 2025.
The most flights from P0R to SEA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 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.
Travelling to a place near Seattle?
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Alternative routes for Portsmouth to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
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 12 September 2025.
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How does Cheapflights help users find flights from Portsmouth to Seattle?
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Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Seattle?
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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.