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Cheap flights from Seattle to London from $309

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 7/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:00 pm - 7:35 pm
SEA
-
SEN
16h 35m
2 stops
Multiple Airlines Logo
11:20 am - 8:40 pm
SEN
-
SEA
17h 20m
2 stops
$923Multiple Airlines
Sun, Sep 6 - Fri, Sep 11
Multiple Airlines Logo
6:15 pm - 7:20 pm
SEA
-
SEN
17h 05m
2 stops
Multiple Airlines Logo
7:50 pm - 4:10 pm
SEN
-
SEA
28h 20m
2 stops
$925Multiple Airlines
Sat, Aug 8 - Sun, Aug 23
Multiple Airlines Logo
7:00 pm - 7:20 pm
SEA
-
SEN
16h 20m
2 stops
Multiple Airlines Logo
7:25 am - 5:55 pm
SEN
-
SEA
18h 30m
2 stops
$1,002Multiple Airlines
Sat, Aug 29 - Sun, Sep 6
Multiple Airlines Logo
7:10 pm - 6:50 pm
SEA
-
SEN
15h 40m
2 stops
Multiple Airlines Logo
7:35 am - 5:10 pm
SEN
-
SEA
17h 35m
2 stops
$1,019Multiple Airlines
Sun, Aug 16 - Sun, Aug 23
Multiple Airlines Logo
3:40 pm - 4:40 pm
SEA
-
SEN
17h 00m
2 stops
Multiple Airlines Logo
11:20 am - 8:40 pm
SEN
-
SEA
17h 20m
2 stops
$1,071Multiple Airlines
Wed, Aug 19 - Fri, Aug 28
Multiple Airlines Logo
3:40 pm - 4:40 pm
SEA
-
SEN
17h 00m
2 stops
Multiple Airlines Logo
12:15 pm - 8:40 pm
SEN
-
SEA
16h 25m
2 stops
$1,131Multiple Airlines
Wed, Jul 29 - Wed, Aug 5
Multiple Airlines Logo
1:30 pm - 7:10 pm
SEA
-
SEN
21h 40m
2 stops
Multiple Airlines Logo
7:35 am - 4:27 pm
SEN
-
SEA
16h 52m
1 stop
$1,448Multiple Airlines
Thu, Jul 30 - Sun, Aug 9

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momondo Fare Finder

 
Customize your flight search to find flights from Seattle to London Southend Airport 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, momondo users made 832,500 searches. Data last updated July 1, 2026.
Use the filters below to find and compare flights from Seattle to London Southend Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Sun 9/6

7:00 pm-7:35 pm

2 stops16h 35m

London Southend

Fri 9/11

11:20 am-8:40 pm

2 stops17h 20m

$923

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Sat 8/8

6:15 pm-7:20 pm

2 stops17h 05m

London Southend

Sun 8/23

7:50 pm-4:10 pm

2 stops28h 20m

$925

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Sat 8/29

7:00 pm-7:20 pm

2 stops16h 20m

London Southend

Sun 9/6

7:25 am-5:55 pm

2 stops18h 30m

$1,002
Quickest round-trip

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Sun 8/16

7:10 pm-6:50 pm

2 stops15h 40m

London Southend

Sun 8/23

7:35 am-5:10 pm

2 stops17h 35m

$1,019

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 8/19

3:40 pm-4:40 pm

2 stops17h 00m

London Southend

Fri 8/28

11:20 am-8:40 pm

2 stops17h 20m

$1,071

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 7/29

3:40 pm-4:40 pm

2 stops17h 00m

London Southend

Wed 8/5

12:15 pm-8:40 pm

2 stops16h 25m

$1,131

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Thu 7/30

1:30 pm-7:10 pm

2 stops21h 40m

London Southend

Sun 8/9

7:35 am-4:27 pm

1 stop16h 52m

$1,448
Cheapest one-way

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Sun 7/26

3:40 pm-11:20 am

3 stops35h 40m

$309
Quickest one-way

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Tue 7/14

3:40 pm-7:40 pm

3 stops20h 00m

$334

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Tue 7/14

3:40 pm-7:40 pm

3 stops20h 00m

$345

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first
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When to book flights from Seattle to London Southend Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to London Southend Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to London Southend Airport (SEA to SEN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to London Southend Airport

Fastest flight time

16h 10m

Direct flights

None
The fastest flight from Seattle to London Southend Airport takes 16h 10m
There are no direct flights from Seattle to London Southend Airport. There are no popular flight routes from Seattle to London Southend Airport.
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Frequently asked questions about flying from Seattle to London Southend Airport

  • How far is Seattle/Tacoma Intl to London Southend by plane?

    There are 4798.7 mi between Seattle/Tacoma Intl and London Southend. Typically, this will take 16h 10m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London Southend Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to London Southend Airport are updated daily.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to London Southend Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to London Southend Airport.

  • What documentation or ID do you need to fly to London Southend Airport?

    The travel and health documents you'll need for your trip to London Southend Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Southend Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from Seattle to London Southend Airport

  • How do I get Price Alerts for flights from Seattle to London Southend Airport?

    Confirm your travel details to search for the latest offers for flights from Seattle to London Southend Airport. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Seattle to London Southend Airport with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Hayes
Dover
Crawley
Croydon
Wembley
Stansted
Harrow
Slough
Watford
Ilford
Cobham
Brentwood
Folkestone
Guildford
Romford
Uxbridge

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Seattle.

Can I find flights from Seattle to London with flexible booking policies on momondo?

momondo does allow users to show only those flights to London from Seattle which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Seattle to London?

momondo provides multiple filters to help you find the best flight to London from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Seattle to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Seattle and alert you when they change.

An easier way to manage your London Southend Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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