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Cheap flights from Southampton to Seattle from £471

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/3. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — SEA
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Southampton to Seattle

Enter your travel dates to find the best prices.

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

Sat 28/317:30SOU - SEA
2 stops35h 20mDelta
Wed 8/407:20SEA - SOU
2 stops17h 15mDelta
Deal found 10/12£583
Sat 28/317:30SOU - SEA
2 stops35h 20mDelta
Fri 10/423:59SEA - SOU
2 stops24h 46mDelta
Deal found 10/12£583
Tue 31/317:20SOU - SEA
1 stop30h 30mDelta
Thu 9/423:12SEA - SOU
2 stops25h 33mDelta
Deal found 10/12£584
Thu 26/308:50SOU - SEA
1 stop34h 45mDelta
Fri 10/406:00SEA - SOU
2 stops18h 45mDelta
Deal found 10/12£584
Sun 29/317:20SOU - SEA
1 stop30h 30mDelta
Fri 10/414:05SEA - SOU
1 stop34h 40mDelta
Deal found 10/12£584
Tue 31/317:20SOU - SEA
1 stop30h 30mDelta
Wed 8/407:15SEA - SOU
2 stops17h 20mDelta
Deal found 10/12£584
Thu 26/308:50SOU - SEA
1 stop34h 45mDelta
Wed 8/406:00SEA - SOU
2 stops18h 35mDelta
Deal found 10/12£584
Tue 31/317:20SOU - SEA
1 stop30h 30mDelta
Fri 10/414:05SEA - SOU
1 stop34h 40mDelta
Deal found 10/12£584
Mon 30/309:05SOU - SEA
1 stop14h 45mDelta
Wed 8/417:35SEA - SOU
1 stop15h 15mDelta
Deal found 10/12£584
Sun 29/317:20SOU - SEA
1 stop30h 30mDelta
Wed 8/417:35SEA - SOU
1 stop15h 15mDelta
Deal found 10/12£584

Find flight deals from Southampton to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Southampton (SOU) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 12 December 2025.

Round-trip from

£583

One-way from

£471

Popular in

July

Cheapest in

January

Average price

£637
Delta
  • Delta
  • 28/3-10/4
  • 4 total stops
  • 60h 06m total
  • Southampton to Seattle
Search Deals
Aer Lingus
  • Aer Lingus
  • 23/3
  • 1 total stop
  • 16h 50m total
  • Southampton 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 (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Southampton to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 12 December 2025.
Use the filters below to find and compare flights from Southampton to Seattle that are best for you.

Fly from

Southampton

Fly to

Seattle

Route

Depart

Return

Price

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 28/3

17:30-21:50

2 stops35h 20m

Seattle/Tacoma Intl

Wed 8/4

07:20-08:35

2 stops17h 15m

£583

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sat 28/3

17:30-21:50

2 stops35h 20m

Seattle/Tacoma Intl

Fri 10/4

23:59-08:45

2 stops24h 46m

£583

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 31/3

17:20-15:50

1 stop30h 30m

Seattle/Tacoma Intl

Thu 9/4

23:12-08:45

2 stops25h 33m

£584

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 26/3

08:50-12:35

1 stop34h 45m

Seattle/Tacoma Intl

Fri 10/4

06:00-08:45

2 stops18h 45m

£584

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 29/3

17:20-15:50

1 stop30h 30m

Seattle/Tacoma Intl

Fri 10/4

14:05-08:45

1 stop34h 40m

£584

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 31/3

17:20-15:50

1 stop30h 30m

Seattle/Tacoma Intl

Wed 8/4

07:15-08:35

2 stops17h 20m

£584

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 26/3

08:50-12:35

1 stop34h 45m

Seattle/Tacoma Intl

Wed 8/4

06:00-08:35

2 stops18h 35m

£584

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 31/3

17:20-15:50

1 stop30h 30m

Seattle/Tacoma Intl

Fri 10/4

14:05-08:45

1 stop34h 40m

£584

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Mon 30/3

09:05-15:50

1 stop14h 45m

Seattle/Tacoma Intl

Wed 8/4

17:35-16:50

1 stop15h 15m

£584

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 29/3

17:20-15:50

1 stop30h 30m

Seattle/Tacoma Intl

Wed 8/4

17:35-16:50

1 stop15h 15m

£584

Flights are sorted by cheapest return flights first.

Deals found on 11/12

Showing 1-10 of 12 results
1
2

Best time to book a flight from Southampton to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Southampton 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 Southampton to Seattle

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

Currently, March is the cheapest month in which you can book a flight from Southampton to Seattle (average of £305). Flying from Southampton to Seattle in August is currently the most expensive (average of £461). 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.

Related info for your journey

Find useful and relevant information for your journey from Southampton to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Southampton to Seattle?

    Delta can get you from Southampton to Seattle in just under 35h 20m. Your travel time can differ by up to . The distance from Southampton to Seattle is about 4787 mi.

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

    Yes. In addition to deals on Southampton to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Southampton to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Southampton to Seattle.

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

    Yes. Cheapflights offers flight deals from Southampton 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 Southampton to Seattle?

    Currently, March is the cheapest month in which you can book a flight from Southampton to Seattle (average of £305). Flying from Southampton to Seattle in August is currently the most expensive (average of £461). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac

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Alternative routes for Southampton to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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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 Southampton to Seattle?

Deals for Southampton to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from Southampton to Seattle by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

Need flexible booking options for your flight to Seattle from Southampton? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights offers price alerts on Southampton to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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