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Cheap flights from Seattle to London from $421

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 4/14. 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

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Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
SWISS Logo
4:35 pm - 6:40 pm
SEA
-
LCY
18h 05m
1 stop
SWISS Logo
9:15 am - 6:32 pm
LCY
-
SEA
17h 17m
2 stops
$833SWISS
Mon, Sep 14 - Tue, Sep 22
Lufthansa Logo
2:10 pm - 5:55 pm
SEA
-
LCY
19h 45m
1 stop
Lufthansa Logo
9:15 am - 6:30 pm
LCY
-
SEA
17h 15m
2 stops
$846Lufthansa
Tue, Apr 28 - Tue, May 5
Lufthansa Logo
2:10 pm - 5:55 pm
SEA
-
LCY
19h 45m
1 stop
Lufthansa Logo
9:15 am - 6:30 pm
LCY
-
SEA
17h 15m
2 stops
$848Lufthansa
Tue, Apr 28 - Tue, May 5
Lufthansa Logo
2:39 pm - 5:55 pm
SEA
-
LCY
19h 16m
2 stops
Lufthansa Logo
9:15 am - 6:30 pm
LCY
-
SEA
17h 15m
2 stops
$850Lufthansa
Tue, Apr 28 - Tue, May 5
Lufthansa Logo
2:39 pm - 5:55 pm
SEA
-
LCY
19h 16m
2 stops
Lufthansa Logo
9:15 am - 6:30 pm
LCY
-
SEA
17h 15m
2 stops
$852Lufthansa
Tue, Apr 28 - Tue, May 5
SWISS Logo
10:30 am - 5:25 pm
SEA
-
LCY
22h 55m
2 stops
SWISS Logo
9:15 am - 6:32 pm
LCY
-
SEA
17h 17m
2 stops
$877SWISS
Tue, Aug 18 - Wed, Sep 30
SWISS Logo
4:35 pm - 5:30 pm
SEA
-
LCY
16h 55m
1 stop
SWISS Logo
9:15 am - 6:32 pm
LCY
-
SEA
17h 17m
2 stops
$878SWISS
Mon, Sep 14 - Wed, Sep 23
Lufthansa Logo
2:10 pm - 5:55 pm
SEA
-
LCY
19h 45m
1 stop
Lufthansa Logo
9:15 am - 4:59 pm
LCY
-
SEA
15h 44m
2 stops
$879Lufthansa
Sun, Aug 16 - Tue, Aug 25
Lufthansa Logo
1:56 pm - 5:55 pm
SEA
-
LCY
19h 59m
2 stops
Lufthansa Logo
9:15 am - 4:59 pm
LCY
-
SEA
15h 44m
2 stops
$881Lufthansa
Sun, Aug 23 - Tue, Sep 1
Lufthansa Logo
2:10 pm - 5:55 pm
SEA
-
LCY
19h 45m
1 stop
Lufthansa Logo
9:15 am - 10:40 pm
LCY
-
SEA
21h 25m
2 stops
$892Lufthansa
Thu, Apr 30 - Thu, May 7

Lufthansa flights from Seattle to London City Airport

Our best Lufthansa deals on Seattle to London City Airport flight tickets
Lufthansa
Apr 28
SEA2:10 pmSeattle/Tacoma Intl
19h 45m
1 stop
LCY5:55 pmLondon City
May 5
LCY9:15 amLondon City
17h 15m
2 stops
SEA6:30 pmSeattle/Tacoma Intl
$846
Lufthansa
Apr 28
SEA2:10 pmSeattle/Tacoma Intl
19h 45m
1 stop
LCY5:55 pmLondon City
May 5
LCY9:15 amLondon City
17h 15m
2 stops
SEA6:30 pmSeattle/Tacoma Intl
$848
Lufthansa
Apr 28
SEA2:39 pmSeattle/Tacoma Intl
19h 16m
2 stops
LCY5:55 pmLondon City
May 5
LCY9:15 amLondon City
17h 15m
2 stops
SEA6:30 pmSeattle/Tacoma Intl
$850

SWISS flights from Seattle to London City Airport

Our best SWISS deals on Seattle to London City Airport flight tickets
SWISS
Sep 14
SEA4:35 pmSeattle/Tacoma Intl
16h 55m
1 stop
LCY5:30 pmLondon City
Sep 22
LCY9:15 amLondon City
17h 17m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
$832
SWISS
Sep 14
SEA4:35 pmSeattle/Tacoma Intl
18h 05m
1 stop
LCY6:40 pmLondon City
Sep 22
LCY9:15 amLondon City
17h 17m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
$833
SWISS
Aug 18
SEA10:30 amSeattle/Tacoma Intl
22h 55m
2 stops
LCY5:25 pmLondon City
Sep 30
LCY9:15 amLondon City
17h 17m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
$877

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to London City 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 April 3, 2026.
Use the filters below to find and compare flights from Seattle to London City Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Mon 9/14

4:35 pm-6:40 pm

1 stop18h 05m

London City

Tue 9/22

9:15 am-6:32 pm

2 stops17h 17m

$833

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 4/28

2:10 pm-5:55 pm

1 stop19h 45m

London City

Tue 5/5

9:15 am-6:30 pm

2 stops17h 15m

$846

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 4/28

2:10 pm-5:55 pm

1 stop19h 45m

London City

Tue 5/5

9:15 am-6:30 pm

2 stops17h 15m

$848

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 4/28

2:39 pm-5:55 pm

2 stops19h 16m

London City

Tue 5/5

9:15 am-6:30 pm

2 stops17h 15m

$850

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 4/28

2:39 pm-5:55 pm

2 stops19h 16m

London City

Tue 5/5

9:15 am-6:30 pm

2 stops17h 15m

$852

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 8/18

10:30 am-5:25 pm

2 stops22h 55m

London City

Wed 9/30

9:15 am-6:32 pm

2 stops17h 17m

$877
Quickest round-trip

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Mon 9/14

4:35 pm-5:30 pm

1 stop16h 55m

London City

Wed 9/23

9:15 am-6:32 pm

2 stops17h 17m

$878

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sun 8/16

2:10 pm-5:55 pm

1 stop19h 45m

London City

Tue 8/25

9:15 am-4:59 pm

2 stops15h 44m

$879

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sun 8/23

1:56 pm-5:55 pm

2 stops19h 59m

London City

Tue 9/1

9:15 am-4:59 pm

2 stops15h 44m

$881

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Thu 4/30

2:10 pm-5:55 pm

1 stop19h 45m

London City

Thu 5/7

9:15 am-10:40 pm

2 stops21h 25m

$892

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Seattle to London City Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Seattle/Tacoma Intl to London City?

United Airlines and KLM are the most popular carriers operating from Seattle/Tacoma Intl to London City

When to book flights from Seattle to London City Airport

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

Cheap Seattle to London City Airport (SEA to LCY) flight deals and tips

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

Fastest flight time

11h 35m

Direct flights

None
The fastest flight from Seattle to London City Airport takes 11h 35m
There are no direct flights from Seattle to London City Airport. There are no popular flight routes from Seattle to London City Airport.
Search flight deals

Frequently asked questions about flying from Seattle to London City Airport

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

    The distance between Seattle/Tacoma Intl and London City is about 4785.6 mi. In terms of flight time, this usually takes a little over 11h 35m.

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

    Prices for flights from Seattle/Tacoma Intl Airport to London City Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to London City Airport?

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to London City Airport.

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

    The travel and health documents you'll need for your trip to London City 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 City Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Seattle to London City Airport?

Best airlines flying from Seattle to London City Airport

Compare and see reviews for airlines that fly from Seattle to London City Airport with momondo
Airline
Rating
Free Cancellation
Price
Scandinavian AirlinesPriceFrom $962Free CancellationRating
7.3
1,737 reviews
Search Scandinavian Airlines flights

Traveling to a place near London?

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

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to London. momondo saves you time and could save you money on your trip.

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

Yes. All flights to London from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search for Seattle to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Of course. momondo tracks the price of Seattle to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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