Cheap flights from Seattle (SEA) to London (LON)

SEA — LON
Feb 7 — Feb 141

The best prices from Seattle/Tacoma Intl to London are usually found in January or February, booked 31 days in advance, depart on a Tuesday or Monday and return on a Tuesday

How to find the cheapest flight from Seattle (SEA) to London (LON)

All the information you need to plan the best SEA to LON flight in 2023: compare Seattle to London flight prices with the expected peak season, weather and rainfall in London.

SEA - LON

Price

$759 - $1,174

LON

Temperature

39.2 - 62.6 °F

LON

Rainfall

1.6 - 2.8 inches

Popular inJulyHigh demand for flights, 20% potential price rise
Cheapest inJanuaryBest time to find cheap flights, 19% potential price drop
Round-trip from$759From Seattle/Tacoma Intl to London (LON)
One-way from$267One-way flight from Seattle/Tacoma Intl to London (LON)

What is the cheapest day to fly round-trip from Seattle to London?

Friday flights are found to be more expensive to fly from Seattle to London. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London.

How far in advance should I book a flight from Seattle to London?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 29 days in advance, which can save you up to 46% on flights from Seattle to London compared to booking the week you need them. Waiting 29 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $1,186. For sooner than that we have options available in the next 3 days from $1,565.

What is the cheapest month to fly from Seattle to London?

January is one of the best times of the year to fly to London from Seattle. Prices for January average $936 per person but you can even find prices for as low as $573. The most expensive prices can be found in the month of July. Opting for a January flight can save you 25% on your journey compared to booking in July

When is the cheapest time to fly from Seattle to London (SEA - LON)?

One of the essential ways to save on airfare from Seattle to London is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 10% on airfare.

Cheap flights from Seattle to London in February, March 2023

The best prices found for SEA to LON flights for February, March
Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$397

Multiple Airlines

Pick Dates

Deal found 2/1

Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$481

Multiple Airlines

Pick Dates

Deal found 2/2

Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

17h 11m
$483

Multiple Airlines

Pick Dates

Deal found 2/1

Seattle to London 2023 flight deals

Cheap flights to London from Seattle found for this year
Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$397

Multiple Airlines

Pick Dates

Deal found 2/1

Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$481

Multiple Airlines

Pick Dates

Deal found 2/2

Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

17h 11m
$483

Multiple Airlines

Pick Dates

Deal found 2/1

Cheap Aer Lingus flights from Seattle to London

Mar 21 - Mar 28
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

13h 05m
$531

Aer Lingus

Pick Dates

Deal found 1/31

Feb 21 - Mar 2
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

14h 10m
$533

Aer Lingus

Pick Dates

Deal found 2/1

Mar 5 - Mar 7
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

14h 10m
$534

Aer Lingus

Pick Dates

Deal found 1/31

  • Aer Lingus is one of the most popular airlines used for those traveling from Seattle to London. Flights on this route from Aer Lingus typically cost $961.97 RT, a price that is 55% more expensive than the average Seattle to London flight. The cheapest flight found was $662 RT. When traveling from Seattle to London on Aer Lingus, the most popular airport to depart from is Seattle/Tacoma Intl Airport and the most popular airport to arrive at is London Heathrow Airport. When flying from Seattle to London, Aer Lingus flights are 8% more popular than any other airline flying that same route.

Cheap Icelandair flights from Seattle to London

Feb 25 - Mar 1
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

12h 20m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

13h 00m
$531

Icelandair

Pick Dates

Deal found 1/31

Feb 25 - Mar 1
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

12h 20m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

13h 00m
$535

Icelandair

Pick Dates

Deal found 1/31

Feb 27 - Mar 7
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 45m
$538

Icelandair

Pick Dates

Deal found 1/30

  • One of the most popular airlines traveling from Seattle to London is Icelandair. Seattle to London flights are typically 49% cheaper than other airlines traveling the same route. Flights from Icelandair typically cost $1,078.93 RT. The cheapest Icelandair flight found for this route was $666. The most popular departure airport in Seattle when flying to London is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London is London Heathrow Airport. When flying from Seattle to London, Icelandair flights are 7% more popular than any other airline flying that same route.

Non-stop flights to London from Seattle

Save time with Seattle to London direct flight deals
Feb 21 - Mar 21
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 25m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$572

Finnair

Pick Dates

Deal found 2/1

Feb 21 - Feb 28
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$581

Finnair

Pick Dates

Deal found 2/1

Mar 13 - Mar 22
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 22m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

9h 59m
$583

Finnair

Pick Dates

Deal found 2/1

Last minute flights from Seattle to London

Late deals on return flights to London from Seattle, departing today and this week
Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$397

Multiple Airlines

Pick Dates

Deal found 2/1

Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

16h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$479

Multiple Airlines

Pick Dates

Deal found 2/1

Feb 10 - Feb 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

17h 11m
$483

Multiple Airlines

Pick Dates

Deal found 2/1

One-way flights to London from Seattle

The cheapest one-way flights from Seattle to London
Feb 28
SEA

Seattle/Tacoma Intl

STN

London Stansted

2 stops

29h 00m
$252

Multiple Airlines

Pick Dates

Deal found 1/31

Mar 5
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

24h 10m
$252

Multiple Airlines

Pick Dates

Deal found 1/30

Mar 28
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

17h 35m
$267

Undisclosed Carrier

Pick Dates

Deal found 1/31

Reviews of Airlines Servicing London

SWISS
7.7
Good
317 reviews

Overall

7.7

Boarding

7.9

Crew

8.4

Comfort

7.5

Entertainment

7.0

Food

7.3

Reviews

1 / 10

incompetent ground team, three double seat allocations, admitting on board person without seat allocated, mess with luggage checking at the entry to plane (after gate!) and etc.

SWISS
7.7
Good
317 reviews
SWISS
7.7
Good
317 reviews

Overall

7.7

Boarding

7.9

Crew

8.4

Comfort

7.5

Entertainment

7.0

Food

7.3

Reviews

1 / 10

incompetent ground team, three double seat allocations, admitting on board person without seat allocated, mess with luggage checking at the entry to plane (after gate!) and etc.

KLM
7.5
Good
118 reviews
SWISS
7.7
Good
317 reviews

Overall

7.7

Boarding

7.9

Crew

8.4

Comfort

7.5

Entertainment

7.0

Food

7.3

Reviews

1 / 10

incompetent ground team, three double seat allocations, admitting on board person without seat allocated, mess with luggage checking at the entry to plane (after gate!) and etc.

American Airlines
7.4
Good
1,668 reviews
SWISS
7.7
Good
317 reviews

Overall

7.7

Boarding

7.9

Crew

8.4

Comfort

7.5

Entertainment

7.0

Food

7.3

Reviews

1 / 10

incompetent ground team, three double seat allocations, admitting on board person without seat allocated, mess with luggage checking at the entry to plane (after gate!) and etc.

Turkish Airlines
7.3
Good
1,139 reviews
SWISS
7.7
Good
317 reviews

Overall

7.7

Boarding

7.9

Crew

8.4

Comfort

7.5

Entertainment

7.0

Food

7.3

Reviews

1 / 10

incompetent ground team, three double seat allocations, admitting on board person without seat allocated, mess with luggage checking at the entry to plane (after gate!) and etc.

Finnair
7.3
Good
193 reviews
SWISS
7.7
Good
317 reviews

Overall

7.7

Boarding

7.9

Crew

8.4

Comfort

7.5

Entertainment

7.0

Food

7.3

Reviews

1 / 10

incompetent ground team, three double seat allocations, admitting on board person without seat allocated, mess with luggage checking at the entry to plane (after gate!) and etc.

Related info for your journey

Useful info, stats and facts about Seattle to London flights.

What airport do you fly from for flights from Seattle to London?

If you book a flight to London from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 16 flights from Seattle/Tacoma Intl to London per day from 21 different airlines.

Which airlines flying from Seattle/Tacoma Intl to London have flexible cancellations due to COVID-19?

British Airways, Virgin Atlantic, and Icelandair are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from Seattle to London for under $500 on Cheapflights?

Yes, there are multiple flights from Seattle to London for under $500. The cheapest flight booked recently is on Multiple Airlines for just $496, but on average you can expect to pay $539.

Are there nonstop flights from Seattle to London for under $600 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to London under $600. A good price for a nonstop flight from Seattle to London is less than $600.

Are there last-minute flights available from Seattle to London for under $400?

There are currently 20+ open flights from Seattle to London within the next 7 days for less than $400.

What are the cheapest airlines flying from Seattle to London round-trip?

Cheapflights users have booked flights from Seattle to London round-trip from $531. Other airlines that can offer you cheap pricing are Aer Lingus, from $531, and Finnair, from $550. Users have found that Icelandair is 43% cheaper than the other options available to this destination.

What are the most popular routes from Seattle to London?

When deciding which route to take from Seattle to London consider Seattle/Tacoma Intl - London Heathrow, Seattle/Tacoma Intl - London Gatwick or Seattle/Tacoma Intl - London City as they are the most popular.

What are the most popular airlines that fly from Seattle to London?

Before booking your flight from Seattle to London check out the most popular airlines for this route: American Airlines, Air Canada or Air France.

What are the most reliable airlines from Seattle to London?

Consider Alaska Airlines (76%), KLM (70%) or Air France (69%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London.

What are the cheapest flights from Seattle to London?

Looking at all options, your cheapest flight can be booked for $536. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $551 on average our data indicates $2,666 when flying from Seattle to London.

Alternative routes for Seattle to London

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Seattle to London

The chart below displays the airlines Cheapflights users traveling from Seattle to London choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Juneyao AirlinesCheapest$11Average$19FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
Norwegian Air UKCheapest$377Average$635FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Norwegian Air UK flights
NorwegianCheapest$403Average$697FlexibilityNo cancel feeOn-time74%COVID-19 safety
Search Norwegian flights
Austrian AirlinesCheapest$438Average$877FlexibilityNo cancel feeOn-time78%COVID-19 safety
Search Austrian Airlines flights
IcelandairCheapest$483Average$789FlexibilityNo cancel feeOn-time76%COVID-19 safety
Search Icelandair flights
Aer LingusCheapest$509Average$858FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Aer Lingus flights
FinnairCheapest$585Average$834FlexibilityNo cancel feeOn-time76%COVID-19 safety
Search Finnair flights
IberiaCheapest$612Average$855FlexibilityNo cancel feeOn-time77%COVID-19 safety
Search Iberia flights
American AirlinesCheapest$623Average$975FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights
British AirwaysCheapest$646Average$988FlexibilityNo cancel feeOn-time70%COVID-19 safety
Search British Airways flights

Hourly flight availability from Seattle to London

See what time of day planes typically take off from Seattle to London
1%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
58%of flight departuresAfternoonNoon to 6 pm
41%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to London

See how many times per day planes take to the skies headed from Seattle to London
Sunday20daily flights
Monday14daily flights
Tuesday16daily flights
Wednesday14daily flights
Thursday16daily flights
Friday16daily flights
Saturday16daily flights
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