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.

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.

$346 Cheap Flights from Seattle to London Southend Airport in 2025/26

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2:35 pm - 5:15 pmSEA-SEN

18h 40m2 stops

5:10 pm - 5:00 pmSEN-SEA

31h 50m2 stops

$714Multiple Airlines

Find Deal

Wed, Dec 3 - Sun, Dec 7

2:35 pm - 5:15 pmSEA-SEN

18h 40m2 stops

4:50 pm - 5:00 pmSEN-SEA

32h 10m2 stops

$741Multiple Airlines

Find Deal

Wed, Nov 19 - Sun, Nov 23

2:35 pm - 5:15 pmSEA-SEN

18h 40m2 stops

4:50 pm - 5:00 pmSEN-SEA

32h 10m2 stops

$746Multiple Airlines

Find Deal

Wed, Nov 19 - Sun, Nov 23

2:35 pm - 5:15 pmSEA-SEN

18h 40m2 stops

4:50 pm - 5:00 pmSEN-SEA

32h 10m2 stops

$747Multiple Airlines

Find Deal

Wed, Nov 19 - Sun, Nov 23

5:50 am - 9:00 pmSEA-SEN

31h 10m3 stops

6:05 pm - 12:10 pmSEN-SEA

26h 05m2 stops

$750Multiple Airlines

Find Deal

Wed, Dec 3 - Sun, Dec 7

8:10 am - 12:50 pmSEA-SEN

20h 40m2 stops

6:05 pm - 12:10 pmSEN-SEA

26h 05m2 stops

$754Multiple Airlines

Find Deal

Thu, Dec 4 - Sun, Dec 7

8:10 am - 9:00 pmSEA-SEN

28h 50m3 stops

10:00 am - 12:10 pmSEN-SEA

34h 10m2 stops

$902Multiple Airlines

Find Deal

Wed, Dec 31 - Fri, Jan 9

2:35 pm - 2:50 pmSEA-SEN

16h 15m2 stops

7:15 am - 5:00 pmSEN-SEA

17h 45m2 stops

$1,175Multiple Airlines

Find Deal

Sun, Dec 14 - Sat, Dec 27

momondo Fare Finder

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

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 12/3

2:35 pm-5:15 pm

2 stops18h 40m

London Southend

Sun 12/7

5:10 pm-5:00 pm

2 stops31h 50m

$714

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 11/19

2:35 pm-5:15 pm

2 stops18h 40m

London Southend

Sun 11/23

4:50 pm-5:00 pm

2 stops32h 10m

$741

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 11/19

2:35 pm-5:15 pm

2 stops18h 40m

London Southend

Sun 11/23

4:50 pm-5:00 pm

2 stops32h 10m

$746

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 11/19

2:35 pm-5:15 pm

2 stops18h 40m

London Southend

Sun 11/23

4:50 pm-5:00 pm

2 stops32h 10m

$747

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 12/3

5:50 am-9:00 pm

3 stops31h 10m

London Southend

Sun 12/7

6:05 pm-12:10 pm

2 stops26h 05m

$750

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Thu 12/4

8:10 am-12:50 pm

2 stops20h 40m

London Southend

Sun 12/7

6:05 pm-12:10 pm

2 stops26h 05m

$754

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 12/31

8:10 am-9:00 pm

3 stops28h 50m

London Southend

Fri 1/9

10:00 am-12:10 pm

2 stops34h 10m

$902

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Sun 12/14

2:35 pm-2:50 pm

2 stops16h 15m

London Southend

Sat 12/27

7:15 am-5:00 pm

2 stops17h 45m

$1,175

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Sat 11/22

11:55 am-10:30 am

3 stops38h 35m

$346

SeattleLondon

SEA - SEN

SEASEN

Seattle/Tacoma Intl

Wed 11/26

11:26 am-12:50 pm

3 stops41h 24m

$350

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 resultsSorted by cheapest first

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

Direct flights	None

There are no direct flights from Seattle to London Southend Airport. There are no popular flight routes from Seattle to London Southend Airport.

Search flight deals

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 15m 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.

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.

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Crawley

Brentwood

Chelmsford

Folkestone

Romford

Ilford

Cobham

Wembley

Stansted

Watford

Harrow

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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Thu 12/11

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Cheap flights from Seattle to London from $346

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 11/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Seattle to London

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to London Southend Airport that are best for you.

When to book flights from Seattle to London Southend Airport

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

Direct flights

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

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

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

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

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

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

How does momondo find its flight prices?

Traveling to a place near London?

Why use momondo?

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

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

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

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

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to London

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo