How long is the flight from Portsmouth to Seattle?

For as low as £532, Virgin Atlantic can have you in Seattle from Portsmouth in 26h 05m. The distance from Portsmouth to Seattle is about 4787 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in Seattle 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 Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, 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).

What are the cheapest flights from Portsmouth to Seattle?

Looking for the cheapest flight from Portsmouth to Seattle? While on average our users pay £1,530, our data indicates the cheapest price to be £459. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £532.

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 (93%), KLM (89%), Air France( 89%).

What are the most popular airlines that fly from Portsmouth to Seattle?

When booking a flight from Portsmouth to Seattle, you may want to consider flying on American Airlines, Air Canada or Air France as they are the most popular for this route.

How far in advance should I book a flight from Portsmouth to Seattle?

Travelers have found it’s best to book a flight 45 days in advance to save up to 41% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 45 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Portsmouth to Seattle 1-2 weeks in advance for as low as £545, or £789 for flights within the next 24 hours.

What is the cheapest month to fly from Portsmouth to Seattle?

January can be a great time to fly to Seattle from Portsmouth with a flight ticket averaging about £547. Cheapflights users have found deals in the month of January for as cheap as £323. The most expensive prices can be found in the month of August.

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.

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.

£532+ Flights from Portsmouth to Seattle

Cheap flight deals from Portsmouth to Seattle

Round-trip from	£532
Popular in	August
Cheapest in	January
Average price	£512

Virgin Atlantic
4/3-8/3
2 total stops
68h 05m total
Portsmouth to Seattle

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£59 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Find flight deals from Portsmouth to Seattle

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 12 September 2025.

Wed 24/909:10SOU - SEA

1 stop16h 40mBritish Airways

Wed 1/1019:35SEA - SOU

1 stop15h 55mBritish Airways

Deal found 10/9£672

Thu 11/909:40SOU - SEA

1 stop16h 10mBritish Airways

Wed 1/1019:35SEA - SOU

1 stop15h 55mBritish Airways

Deal found 10/9£1,042

Thu 11/908:40SOU - SEA

2 stops17h 40mBritish Airways

Thu 25/919:35SEA - SOU

1 stop12h 00mBritish Airways

Deal found 10/9£1,149

Mon 13/1019:40SOU - SEA

2 stops23h 30mBritish Airways

Mon 27/1019:50SEA - SOU

2 stops17h 30mBritish Airways

Deal found 11/9£3,141

Mon 13/1008:55SOU - SEA

2 stops17h 25mBritish Airways

Tue 28/1014:25SEA - SOU

2 stops21h 05mBritish Airways

Deal found 11/9£3,262

Mon 13/1008:55SOU - SEA

2 stops17h 25mBritish Airways

Sun 26/1019:50SEA - SOU

2 stops16h 20mBritish Airways

Deal found 11/9£3,351

Sat 11/1009:20SOU - SEA

1 stop14h 45mDelta

Tue 28/1016:00SEA - SOU

1 stop18h 00mDelta

Deal found 11/9£7,942

Sat 11/1009:40SOU - SEA

1 stop16h 10mBritish Airways

Mon 27/1019:50SEA - SOU

2 stops16h 20mBritish Airways

Deal found 11/9£7,973

Best flights from Portsmouth to Seattle
Discover carefully curated flight deals from Portsmouth to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 September 2025.

Wed 4/308:40SOU - SEA

1 stop34h 55mVirgin Atlantic

Sun 8/316:00SEA - SOU

1 stop33h 10mVirgin Atlantic

Deal found 11/9£532

Wed 4/317:30SOU - SEA

1 stop26h 05mDelta

Sun 8/307:20SEA - SOU

2 stops41h 50mDelta

Deal found 11/9£532

Wed 24/909:10SOU - SEA

1 stop16h 40mBritish Airways

Wed 1/1019:35SEA - SOU

1 stop15h 55mBritish Airways

Deal found 10/9£672

Mon 13/1019:40SOU - SEA

2 stops23h 30mBritish Airways

Mon 27/1019:50SEA - SOU

2 stops17h 30mBritish Airways

Deal found 11/9£3,141

Last-minute flights from Portsmouth to Seattle
Discover last-minute flight deals from Portsmouth to Seattle. Data last updated 12 September 2025 and is based on user searches.

Thu 11/909:40SOU - SEA

1 stop16h 10mBritish Airways

Wed 1/1019:35SEA - SOU

1 stop15h 55mBritish Airways

Deal found 10/9£1,042

Thu 11/908:40SOU - SEA

2 stops17h 40mBritish Airways

Thu 25/919:35SEA - SOU

1 stop12h 00mBritish Airways

Deal found 10/9£1,149

Wed 24/909:10SOU - SEA

1 stop16h 40mBritish Airways

Wed 1/1019:35SEA - SOU

1 stop15h 55mBritish Airways

Deal found 10/9£672

Sat 11/1009:20SOU - SEA

1 stop14h 45mDelta

Tue 28/1016:00SEA - SOU

1 stop18h 00mDelta

Deal found 11/9£7,942

Sat 11/1009:40SOU - SEA

1 stop16h 10mBritish Airways

Mon 27/1019:50SEA - SOU

2 stops16h 20mBritish Airways

Deal found 11/9£7,973

Mon 13/1019:40SOU - SEA

2 stops23h 30mBritish Airways

Mon 27/1019:50SEA - SOU

2 stops17h 30mBritish Airways

Deal found 11/9£3,141

Mon 13/1008:55SOU - SEA

2 stops17h 25mBritish Airways

Tue 28/1014:25SEA - SOU

2 stops21h 05mBritish Airways

Deal found 11/9£3,262

Mon 13/1008:55SOU - SEA

2 stops17h 25mBritish Airways

Sun 26/1019:50SEA - SOU

2 stops16h 20mBritish Airways

Deal found 11/9£3,351

One-way flights from Portsmouth to Seattle
Search for one-way flight options from Portsmouth to Seattle. Find affordable one-way fares based on user searches. Data last updated 12 September 2025.

Fri 3/1009:40SOU - SEA

1 stop16h 10mBritish Airways

Deal found 11/9£726

Sat 11/1009:20SOU - SEA

1 stop14h 45mDelta

Deal found 11/9£7,978

Sat 11/1009:55SOU - SEA

2 stops15h 55mBritish Airways

Deal found 11/9£10,157

Sun 12/1019:40SOU - SEA

2 stops23h 55mBritish Airways

Deal found 11/9£10,172

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

£532

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

£532

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

£672

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

£3,141

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Fri 3/10

09:40-17:50

1 stop16h 10m

£726

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 13/10

09:20-16:05

1 stop14h 45m

£7,978

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 11/10

09:20-16:05

1 stop14h 45m

£7,978

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 12/10

09:20-16:05

1 stop14h 45m

£7,978

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 11/10

09:55-17:50

2 stops15h 55m

£10,157

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 13/10

19:40-18:20

2 stops30h 40m

£10,172

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 11 results

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 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?

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 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

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 £532, Virgin Atlantic can have you in Seattle from Portsmouth in 26h 05m. The distance from Portsmouth to Seattle is about 4787 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
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 (93%), KLM (89%), Air France( 89%).
What are the cheapest flights from Portsmouth to Seattle?
Looking for the cheapest flight from Portsmouth to Seattle? While on average our users pay £1,530, our data indicates the cheapest price to be £459. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £532.
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.
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.

See more FAQs

Tacoma

Leavenworth

Bothell

SeaTac

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Top 10 airlines flying from Portsmouth to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£323	Average£495	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£381	Average£569	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£392	Average£489	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Finnair	Cheapest£394	Average£537	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£401	Average£562	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£402	Average£640	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Aer Lingus	Cheapest£403	Average£654	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£425	Average£588	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£436	Average£528	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Delta	Cheapest£441	Average£590	FlexibilityNo cancel fee	On-timeN/A	Search Delta 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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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

Popular in

Cheapest in

Average price

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.

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?

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.

Weekly flight availability from Portsmouth to Seattle

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?

How long is the flight from Portsmouth to Seattle?

What are the most reliable airlines from Portsmouth to Seattle?

What are the cheapest flights from Portsmouth to Seattle?

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

How can I find direct flights from Portsmouth to Seattle?

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

What is the cheapest month to book a flight from Portsmouth to Seattle?

Travelling to a place near Seattle?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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

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?

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

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

Can Cheapflights notify me if prices for flights from Portsmouth to Seattle become cheaper?

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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 12 September 2025.