London

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

The best prices from Seattle/Tacoma Intl to London are usually found in October or January, booked 60 days in advance, depart on a Tuesday or Monday and return on a Tuesday

How to find the cheapest flight from Seattle to London

All the information you need to plan the best SEA to LON flight in 2022: compare Seattle to London flight prices with the expected peak season, weather and rainfall in London.

SEA - LON

Price

$487 - $787

LON

Temperature

39.2 - 62.6 °F

LON

Precipitation

1.6 - 2.8 inches

Popular in

December

High demand for flights, 27% potential price rise

Cheapest in

October

Best time to find cheap flights, 15% potential price drop

Round-trip from

$487

From Seattle/Tacoma Intl to London (LON)

One-way from

$304

One-way flight from Seattle/Tacoma Intl to London (LON)

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

Thursday 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 61 days in advance, which can save you up to 75% on flights from Seattle to London compared to booking the week you need them. Waiting 61 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 $820. For sooner than that we have options available in the next 3 days from $1,079.

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

October is one of the best times of the year to fly to London from Seattle. Prices for October average $575 per person but you can even find prices for as low as $416. The most expensive prices can be found in the month of December. Opting for a October flight can save you 36% on your journey compared to booking in October

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 in the evening could potentially save you up to 6% on airfare.

Cheap flights from Seattle to London in January, February 2022

The best prices found for SEA to LON flights for January, February
Feb 2 - Feb 9
SEA

Seattle/Tacoma Intl

STN

London Stansted

2 stops

22h 10m
STN

London Stansted

SEA

Seattle/Tacoma Intl

2 stops

22h 31m
$521

Multiple Airlines

View Deal

Deal found 1/19/22

Feb 2 - Feb 10
SEA

Seattle/Tacoma Intl

STN

London Stansted

2 stops

22h 10m
STN

London Stansted

SEA

Seattle/Tacoma Intl

2 stops

22h 31m
$530

Multiple Airlines

View Deal

Deal found 1/19/22

Feb 5 - Mar 4
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

21h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

2 stops

34h 10m
$540

Multiple Airlines

View Deal

Deal found 1/18/22

Seattle to London 2022 flight deals

Cheap flights to London from Seattle found for this year
Feb 2 - Feb 9
SEA

Seattle/Tacoma Intl

STN

London Stansted

2 stops

22h 10m
STN

London Stansted

SEA

Seattle/Tacoma Intl

2 stops

22h 31m
$521

Multiple Airlines

View Deal

Deal found 1/19/22

Mar 16 - Mar 25
SEA

Seattle/Tacoma Intl

STN

London Stansted

2 stops

23h 15m
STN

London Stansted

SEA

Seattle/Tacoma Intl

2 stops

22h 27m
$527

Multiple Airlines

View Deal

Deal found 1/19/22

Feb 2 - Feb 10
SEA

Seattle/Tacoma Intl

STN

London Stansted

2 stops

22h 10m
STN

London Stansted

SEA

Seattle/Tacoma Intl

2 stops

22h 31m
$530

Multiple Airlines

View Deal

Deal found 1/19/22

Non-stop flights to London from Seattle

Save time with Seattle to London direct flight deals
Feb 13 - Mar 30
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 25m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

9h 45m
$674

Multiple Airlines

View Deal

Deal found 1/20/22

Feb 16 - Feb 23
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 05m
$675

British Airways

View Deal

Deal found 1/17/22

Feb 2 - Feb 22
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 05m
$680

Finnair

View Deal

Deal found 1/19/22

Last minute flights from Seattle to London

Late deals on return flights to London from Seattle, departing today and this week
Jan 30 - Feb 9
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

2 stops

21h 55m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

2 stops

31h 50m
$647

Multiple Airlines

View Deal

Deal found 1/20/22

Jan 27 - Feb 10
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

23h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

2 stops

38h 49m
$658

Multiple Airlines

View Deal

Deal found 1/20/22

Jan 30 - Feb 10
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

23h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

2 stops

23h 04m
$661

Multiple Airlines

View Deal

Deal found 1/19/22

One-way flights to London All airports from Seattle

The cheapest one-way flights from Seattle to London
Feb 13
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

2 stops

60h 25m
$279

WestJet

View Deal

Deal found 1/18/22

Apr 20
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

3 stops

36h 28m
$292

Multiple Airlines

View Deal

Deal found 1/20/22

Apr 20
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

3 stops

36h 28m
$293

Multiple Airlines

View Deal

Deal found 1/19/22

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 9 flights from Seattle/Tacoma Intl to London per day from 19 different airlines.

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

Delta, Virgin Atlantic, and British Airways 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 $600 on Cheapflights?

Yes, there are multiple flights from Seattle to London for under $600. The cheapest flight booked recently is on Multiple Airlines for just $521, but on average you can expect to pay $546.

Are there nonstop flights from Seattle to London for under $700 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to London under $700. A good price for a nonstop flight from Seattle to London is less than $707.

Are there last-minute flights available from Seattle to London for under $700?

There are currently 20+ open flights from Seattle to London within the next 7 days for less than $700.

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: Major Airline, American Airlines or Air Canada.

What are the most reliable airlines from Seattle to London?

Consider Aer Lingus (62%), American Airlines (62%) or Finnair (62%) 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 $328. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $542 on average our data indicates $1,431 when flying from Seattle to London.

Can I fly to London from Seattle/Tacoma Intl right now?

Information is based on travel restrictions from Seattle/Tacoma Intl to London

Most visitors from Seattle/Tacoma Intl need to provide a negative COVID-19 test result and/or quarantine to enter London.

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 48 hours before departing to London.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering London.

Documents
Mandatory passenger locator form - Submit the form any time in the 48 hours before arriving in the UK. Show the form when checking in your plane, train or ferry to the UK.

Managed quarantine package for Scotland - All travelers arriving directly to Scotland are required to book their Managed Quarantine Package prior to travel.

COVID-19 testing package - All travelers must book and pay for a COVID-19 Testing Package prior to travel to England and Scotland.


Can I fly back to Seattle/Tacoma Intl from London?

Returning to Seattle/Tacoma Intl from London

COVID-19 testing requirements
Visitors from London must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Seattle/Tacoma Intl.

Quarantine requirements
Visitors from London are not required to quarantine after entering Seattle/Tacoma Intl.

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
Finnair
Cheapest$335
Average$853
FlexibilityNo cancel fee
On-time76%
COVID-19 safety
Icelandair
Cheapest$369
Average$645
FlexibilityNo cancel fee
On-time76%
COVID-19 safety
Air Canada
Cheapest$373
Average$633
FlexibilityNo cancel fee
On-time67%
COVID-19 safety
Norwegian Air UK
Cheapest$377
Average$635
FlexibilityNo cancel fee
On-timeN/A
COVID-19 safety
Lufthansa
Cheapest$378
Average$592
FlexibilityNo cancel fee
On-time76%
COVID-19 safety
Norwegian
Cheapest$403
Average$697
FlexibilityNo cancel fee
On-time74%
COVID-19 safety
United Airlines
Cheapest$407
Average$642
FlexibilityNo cancel fee
On-time69%
COVID-19 safety
British Airways
Cheapest$411
Average$662
FlexibilityNo cancel fee
On-time70%
COVID-19 safety
Air France
Cheapest$414
Average$583
FlexibilityNo cancel fee
On-time77%
COVID-19 safety
American Airlines
Cheapest$415
Average$735
FlexibilityNo cancel fee
On-time71%
COVID-19 safety

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
41%of flight departuresAfternoonNoon to 6 pm
58%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
Sunday10daily flights
Monday10daily flights
Tuesday5daily flights
Wednesday10daily flights
Thursday10daily flights
Friday10daily flights
Saturday10daily flights