Heathrow

Cheap flights from Seattle (SEA) to Heathrow (LHR)

How to find the cheapest flight from Seattle to Heathrow

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

SEA - LHR

Price

$536 - $871

LHR

Temperature

39.2 - 62.6 °F

LHR

Precipitation

1.6 - 2.8 inches

Popular in

December

High demand for flights, 31% potential price rise

Cheapest in

October

Best time to find cheap flights, 11% potential price drop

Round-trip from

$536

From Seattle/Tacoma Intl to London Heathrow

One-way from

$350

One-way flight from Seattle/Tacoma Intl to London Heathrow

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

To save up to 75% on this flight, we recommend booking at least 61 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Seattle to London Heathrow Airport from $820 1-2 weeks out and tickets from $1,079 for flights departing within the next 72 hours.

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

The best pricing can be found in the month of October. Prices to London Heathrow Airport from Seattle average $575. You can even find prices in October for less than $575, as users have found deals to London Heathrow Airport from as low as $416. The month of December appears to be one of the more expensive times to travel to London Heathrow Airport from Seattle. Flying in the targeted month can save you up to 36%.

When is the cheapest time to fly from Seattle to London Heathrow Airport (SEA - LHR)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to London Heathrow Airport as you normally would.

Cheap flights from Seattle to Heathrow in January, February 2022

The best prices found for SEA to LHR flights for January, February
Feb 12 - Feb 24
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

25h 05m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

2 stops

23h 44m
$564

Multiple Airlines

View Deal

Deal found 1/25/22

Feb 24 - Mar 3
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

23h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

2 stops

23h 08m
$565

Multiple Airlines

View Deal

Deal found 1/25/22

Feb 13 - Mar 22
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 00m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 40m
$566

Icelandair

View Deal

Deal found 1/23/22

Seattle to Heathrow 2022 flight deals

Cheap flights to Heathrow from Seattle found for this year
Feb 12 - Feb 24
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

25h 05m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

2 stops

23h 44m
$564

Multiple Airlines

View Deal

Deal found 1/25/22

Feb 24 - Mar 3
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

23h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

2 stops

23h 08m
$565

Multiple Airlines

View Deal

Deal found 1/25/22

Feb 13 - Mar 22
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 00m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 40m
$566

Icelandair

View Deal

Deal found 1/23/22

Non-stop flights to Heathrow from Seattle

Save time with Seattle to Heathrow direct flight deals
Feb 13 - Mar 22
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 25m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$655

Multiple Airlines

View Deal

Deal found 1/23/22

Feb 13 - Mar 22
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 05m
$664

Multiple Airlines

View Deal

Deal found 1/23/22

Feb 23 - Mar 4
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 25m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$670

Multiple Airlines

View Deal

Deal found 1/23/22

Last minute flights from Seattle to Heathrow

Late deals on return flights to Heathrow from Seattle, departing today and this week
Feb 3 - Feb 6
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 00m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 40m
$605

Icelandair

View Deal

Deal found 1/25/22

Feb 5 - Feb 10
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 00m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 40m
$608

Icelandair

View Deal

Deal found 1/25/22

Feb 3 - Mar 3
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 00m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 40m
$609

Icelandair

View Deal

Deal found 1/24/22

One-way flights to London Heathrow from Seattle

The cheapest one-way flights from Seattle to Heathrow
Apr 20
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

15h 20m
$293

WestJet

View Deal

Deal found 1/25/22

May 9
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

40h 05m
$294

WestJet

View Deal

Deal found 1/24/22

Mar 2
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

16h 45m
$297

Multiple Airlines

View Deal

Deal found 1/25/22

Related info for your journey

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

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

Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to London Heathrow. You should not have trouble finding flights to London Heathrow from Seattle/Tacoma Intl; the airport handles an average of 7 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 18 airlines have flights from the Seattle airport to London Heathrow. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

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

Some of our airline partners flying from Seattle/Tacoma Intl to London Heathrow have new flexible policies in place due to COVID-19. Delta, Virgin Atlantic, and British Airways are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Delta with this kind of flexibility.

Can I find flights from Seattle to London Heathrow Airport for under $600 on Cheapflights?

Yes, there are multiple flights from Seattle to London Heathrow Airport for under $600. The cheapest flight booked recently is on Multiple Airlines for just $564, but on average you can expect to pay $578.

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

Cheapflights has at least 20 direct flights from Seattle to London Heathrow Airport under $700. A good price for a nonstop flight from Seattle to London Heathrow Airport is less than $687.

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

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

What is the cheapest airline to fly from Seattle to London Heathrow Airport round-trip?

Our cheapest airline available from Seattle to London Heathrow Airport is Icelandair. Our recent data shows that you can find tickets from as low as $566 on this airline. Icelandair is currently priced 5% below the average price you’ll pay for this route.

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

Before booking your flight from Seattle to London Heathrow Airport 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 Heathrow Airport?

No one likes to see their flight delayed. When booking a flight from Seattle to London Heathrow Airport consider choosing Aer Lingus (62%), American Airlines (62%) or Finnair (62%) as they are the most reliable in getting you off to your destination on time.

What are the cheapest flights from Seattle to London Heathrow Airport?

Looking for the cheapest flight from Seattle to London Heathrow Airport? While on average our users pay $1,431, our data indicates the cheapest price to be $328. The most popular route (Seattle/Tacoma Intl - London Heathrow), is priced around $565.

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

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

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

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 Heathrow.

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

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 Heathrow?

Returning to Seattle/Tacoma Intl from London Heathrow

COVID-19 testing requirements
Visitors from London Heathrow 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 Heathrow are not required to quarantine after entering Seattle/Tacoma Intl.

Alternative routes for Seattle to Heathrow

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

Top 10 airlines flying from Seattle to Heathrow

The chart below displays the airlines Cheapflights users traveling from Seattle to Heathrow 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$1,024
FlexibilityNo cancel fee
On-time76%
COVID-19 safety
Air Canada
Cheapest$373
Average$633
FlexibilityNo cancel fee
On-time67%
COVID-19 safety
Lufthansa
Cheapest$378
Average$592
FlexibilityNo cancel fee
On-time76%
COVID-19 safety
Norwegian Air UK
Cheapest$398
Average$710
FlexibilityNo cancel fee
On-timeN/A
COVID-19 safety
Norwegian
Cheapest$407
Average$824
FlexibilityNo cancel fee
On-time74%
COVID-19 safety
United Airlines
Cheapest$407
Average$642
FlexibilityNo cancel fee
On-time69%
COVID-19 safety
Icelandair
Cheapest$410
Average$693
FlexibilityNo cancel fee
On-time76%
COVID-19 safety
British Airways
Cheapest$411
Average$780
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$796
FlexibilityNo cancel fee
On-time71%
COVID-19 safety

Hourly flight availability from Seattle to Heathrow

See what time of day planes typically take off from Seattle to Heathrow
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 Heathrow

See how many times per day planes take to the skies headed from Seattle to Heathrow
Sunday8daily flights
Monday10daily flights
Tuesday5daily flights
Wednesday10daily flights
Thursday3daily flights
Friday8daily flights
Saturday8daily flights