£618 Cheap Flights from Southampton (SOU) to Seattle (SEA)

View £618 flight on Sat, 20 Jun 2026Opens in a new window

Popular airlines from Southampton (SOU) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Southampton (SOU) to Seattle (SEA)

Prices were available within the past 7 days and start at £618 for one-way flights and £702 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Aer Lingus
Mon, 1 Jun - Sun, 7 Jun
SOU
Southampton
SEA
Seattle
£702 Return, found 8 hours ago
£702
Return
found 8 hours ago
Select Aer Lingus flight, departing Mon, 1 Jun from Southampton to Seattle, returning Sun, 7 Jun, priced at £702 found 8 hours ago
Aer Lingus
Mon, 1 Jun - Sun, 7 Jun
SOU
Southampton
SEA
Seattle
£714 Return, found 8 hours ago
£714
Return
found 8 hours ago
Select Aer Lingus flight, departing Mon, 1 Jun from Southampton to Seattle, returning Sun, 7 Jun, priced at £714 found 8 hours ago
Aer Lingus
Mon, 1 Jun - Fri, 24 Jul
SOU
Southampton
SEA
Seattle
£747 Return, found 12 hours ago
£747
Return
found 12 hours ago
Select Aer Lingus flight, departing Mon, 1 Jun from Southampton to Seattle, returning Fri, 24 Jul, priced at £747 found 12 hours ago
KLM
Fri, 15 May - Tue, 19 May
SOU
Southampton
SEA
Seattle
£847 Return, found 21 hours ago
£847
Return
found 21 hours ago
Select KLM flight, departing Fri, 15 May from Southampton to Seattle, returning Tue, 19 May, priced at £847 found 21 hours ago
KLM
Fri, 15 May - Tue, 19 May
SOU
Southampton
SEA
Seattle
£851 Return, found 21 hours ago
£851
Return
found 21 hours ago
Select KLM flight, departing Fri, 15 May from Southampton to Seattle, returning Tue, 19 May, priced at £851 found 21 hours ago
KLM
Fri, 15 May - Tue, 19 May
SOU
Southampton
SEA
Seattle
£851 Return, found 21 hours ago
£851
Return
found 21 hours ago
Select KLM flight, departing Fri, 15 May from Southampton to Seattle, returning Tue, 19 May, priced at £851 found 21 hours ago
KLM
Fri, 15 May - Tue, 19 May
SOU
Southampton
SEA
Seattle
£852 Return, found 21 hours ago
£852
Return
found 21 hours ago
Select KLM flight, departing Fri, 15 May from Southampton to Seattle, returning Tue, 19 May, priced at £852 found 21 hours ago
British Airways
Tue, 2 Jun - Fri, 24 Jul
SOU
Southampton
SEA
Seattle
£878 Return, found 4 days ago
£878
Return
found 4 days ago
Select British Airways flight, departing Tue, 2 Jun from Southampton to Seattle, returning Fri, 24 Jul, priced at £878 found 4 days ago
Virgin Atlantic
Tue, 2 Jun - Fri, 24 Jul
SOU
Southampton
SEA
Seattle
£986 Return, found 4 days ago
£986
Return
found 4 days ago
Select Virgin Atlantic flight, departing Tue, 2 Jun from Southampton to Seattle, returning Fri, 24 Jul, priced at £986 found 4 days ago
Delta
Fri, 12 Jun - Fri, 19 Jun
SOU
Southampton
SEA
Seattle
£1,263 Return, found 3 days ago
£1,263
Return
found 3 days ago
Select Delta flight, departing Fri, 12 Jun from Southampton to Seattle, returning Fri, 19 Jun, priced at £1,263 found 3 days ago

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city centre is 20 minutes. Flights from £847
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city centre20 min
Flights from £847

Frequently asked questions

How do I find cheap flights from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
There are approximately 7 connecting flights per day from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.). Some common connection points include Dublin (DUB), Amsterdam Airport Schiphol (AMS), and Edinburgh (EDI).
What is the earliest flight from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Southampton (SOU) to Seattle - Tacoma Intl. (SEA) typically departs at approximately 6:50 AM local time. This service is operated by LM and BA and is seasonal, active only in May. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You'll typically find the most flights from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) (SEA) on a Monday, with around 25 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Aer Lingus, KLM, and Lufthansa.
What are the most popular departure times for flights from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) are in the evening, from 6pm to 9pm. About 38% of passengers prefer this time window. Many major carriers, including British Airways, United Airlines and Aer Lingus, offer flights during this window. This timing works well because you can finish your day in Southampton and arrive in Seattle ready to start your trip.
How long does it take to fly from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Flights from SOU to SEA with one stop typically take around 15 hours 20 minutes, covering approximately 4,791 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Select the "Business class" and "First class" filters when looking for SOU to SEA flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle from SOU (SOU)?
If you're planning to travel to Seattle from SOU (SOU), you can fly directly into Seattle - Tacoma Intl. (SEA) Some flights may connect through major hubs like DUB (DUB), EDI (EDI), George Best Belfast City (BHD) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Southampton (SOU) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Southampton
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Aer Lingus, British Airways, KLM
Return price
£701
Distance
7663 km

Book with confidence

Compare flights from Southampton to Seattle easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Southampton to Seattle. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Seattle - Tacoma Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Southampton to Seattle - Tacoma Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Southampton (SOU) to Seattle - Tacoma Intl. (SEA)

The easiest way to view the best deals on flights from Southampton to Seattle today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Southampton to Seattle - Tacoma Intl. start at just £702 and range up to £1,408.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Southampton and Seattle
  • booking your flight during June, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Southampton to Seattle flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Southampton to Seattle - Tacoma Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Southampton to Seattle easily and book with confidence

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