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

SEA — LHR
Dec 3 — Dec 101

How to find the cheapest flight from Seattle (SEA) to Heathrow (LHR)

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

$773 - $1,166

LHR

Temperature

39.2 - 62.6 °F

LHR

Rainfall

1.6 - 2.8 inches

Popular inJuneHigh demand for flights, 19% potential price rise
Cheapest inFebruaryBest time to find cheap flights, 18% potential price drop
Round-trip from$773From Seattle/Tacoma Intl to London Heathrow
One-way from$302One-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 57% on this flight, we recommend booking at least 55 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 $1,286 1-2 weeks out and tickets from $1,737 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 February. Prices to London Heathrow Airport from Seattle average $938. You can even find prices in February for less than $938, as users have found deals to London Heathrow Airport from as low as $625. The month of July 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 25%.

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 November, December 2022

The best prices found for SEA to LHR flights for November, December
Dec 8 - Dec 14
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

16h 35m
$561

Aer Lingus

Pick Dates

Deal found 11/26

Dec 7 - Dec 12
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

30h 40m
$562

Aer Lingus

Pick Dates

Deal found 11/26

Dec 8 - Jan 17
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

14h 10m
$564

Aer Lingus

Pick Dates

Deal found 11/28

Seattle to Heathrow 2022 flight deals

Cheap flights to Heathrow from Seattle found for this year
Dec 8 - Dec 14
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

16h 35m
$561

Aer Lingus

Pick Dates

Deal found 11/26

Dec 7 - Dec 12
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

30h 40m
$562

Aer Lingus

Pick Dates

Deal found 11/26

Dec 8 - Jan 17
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

14h 10m
$564

Aer Lingus

Pick Dates

Deal found 11/28

Cheap Icelandair flights from Seattle to Heathrow

Feb 6 - Feb 14
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 45m
$452

Icelandair

Pick Dates

Deal found 11/25

Jan 17 - Feb 6
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

28h 20m
$455

Icelandair

Pick Dates

Deal found 11/26

Feb 25 - Mar 7
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 45m
$456

Icelandair

Pick Dates

Deal found 11/26

  • One of the most popular airlines traveling from Seattle to London Heathrow Airport is Icelandair. Seattle to London Heathrow Airport flights are typically 42% cheaper than other airlines traveling the same route. Flights from Icelandair typically cost $1,085.43 RT. The cheapest Icelandair flight found for this route was $735. The most popular departure airport in Seattle when flying to London Heathrow Airport is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London Heathrow Airport is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, Icelandair flights are 5% more popular than any other airline flying that same route.

Cheap Aer Lingus flights from Seattle to Heathrow

Feb 4 - Feb 11
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

14h 10m
$478

Aer Lingus

Pick Dates

Deal found 11/26

Dec 8 - Dec 14
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

16h 35m
$561

Aer Lingus

Pick Dates

Deal found 11/26

Dec 7 - Dec 12
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

30h 40m
$562

Aer Lingus

Pick Dates

Deal found 11/26

  • Aer Lingus is one of the most popular airlines used for those traveling from Seattle to London Heathrow Airport. Flights on this route from Aer Lingus typically cost $790.20 RT, a price that is 61% more expensive than the average Seattle to London Heathrow Airport flight. The cheapest flight found was $655 RT. When traveling from Seattle to London Heathrow Airport 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 Heathrow Airport, Aer Lingus flights are 4% more popular than any other airline flying that same route.

Non-stop flights to Heathrow from Seattle

Save time with Seattle to Heathrow direct flight deals
Feb 20 - Mar 10
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 35m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

9h 50m
$585

Virgin Atlantic

Pick Dates

Deal found 11/27

Jan 24 - Feb 14
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 25m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$600

Iberia

Pick Dates

Deal found 11/28

Jan 15 - Jan 26
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 25m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 00m
$601

British Airways

Pick Dates

Deal found 11/26

Last minute flights from Seattle to Heathrow

Late deals on return flights to Heathrow from Seattle, departing today and this week
Dec 8 - Dec 14
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

16h 35m
$561

Aer Lingus

Pick Dates

Deal found 11/26

Dec 7 - Dec 12
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

30h 40m
$562

Aer Lingus

Pick Dates

Deal found 11/26

Dec 7 - Dec 14
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

14h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

18h 35m
$566

Aer Lingus

Pick Dates

Deal found 11/28

One-way flights to Heathrow from Seattle

The cheapest one-way flights from Seattle to Heathrow
Jan 25
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

15h 45m
$256

WestJet

Pick Dates

Deal found 11/26

Feb 11
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

15h 45m
$257

WestJet

Pick Dates

Deal found 11/26

May 19
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

32h 55m
$281

WestJet

Pick Dates

Deal found 11/25

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 12 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 21 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. British Airways, Virgin Atlantic, and Delta are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like British Airways with this kind of flexibility.

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

Yes, there are multiple flights from Seattle to London Heathrow Airport for under $500. The cheapest flight booked recently is on Icelandair for just $452, but on average you can expect to pay $472.

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

Cheapflights has at least 20 direct flights from Seattle to London Heathrow Airport under $600. A good price for a nonstop flight from Seattle to London Heathrow Airport is less than $612.

Are there last-minute flights available from Seattle to London Heathrow Airport for under $600?

There are currently 20+ open flights from Seattle to London Heathrow Airport within the next 7 days for less than $600.

What days are nonstop flights available from Seattle to London Heathrow Airport?

Days when nonstop flights are available for this flight are: Monday.

How many flights depart from Seattle to London Heathrow Airport on average per day?

3 flight departures from Seattle to London Heathrow Airport per day on average.
Evening (6pm - Midnight) - 100% of flight departures

How long is the flight from Seattle to London Heathrow Airport?

For as low as $452, Icelandair can have you in London Heathrow Airport from Seattle in 12h 15m. The distance between Seattle and London Heathrow Airport is about 4812 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying 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 $452 on this airline. An additional option worth looking into is Aer Lingus, starting at $478. Icelandair is currently priced 52% below the average price you’ll pay for this route.

What are the cheapest airlines to fly from Seattle to London Heathrow Airport one-way?

The cheapest airlines for a one-way flight from Seattle to London Heathrow Airport are WestJet ($256), Aer Lingus ($302), and TAP AIR PORTUGAL ($330).

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: American Airlines, Air Canada or Air France.

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 Alaska Airlines (88%), KLM (86%) or Air France (82%) 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 $2,818, our data indicates the cheapest price to be $394. The most popular route (Seattle/Tacoma Intl - London Heathrow), is priced around $450.

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
Juneyao AirlinesCheapest$11Average$19FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
Norwegian Air UKCheapest$398Average$710FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Norwegian Air UK flights
NorwegianCheapest$407Average$824FlexibilityNo cancel feeOn-time74%COVID-19 safety
Search Norwegian flights
Austrian AirlinesCheapest$438Average$877FlexibilityNo cancel feeOn-time78%COVID-19 safety
Search Austrian Airlines flights
IcelandairCheapest$541Average$811FlexibilityNo cancel feeOn-time76%COVID-19 safety
Search Icelandair flights
Aer LingusCheapest$600Average$889FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Aer Lingus flights
IberiaCheapest$622Average$873FlexibilityNo cancel feeOn-time77%COVID-19 safety
Search Iberia flights
Air FranceCheapest$655Average$790FlexibilityNo cancel feeOn-time77%COVID-19 safety
Search Air France flights
FinnairCheapest$661Average$910FlexibilityNo cancel feeOn-time76%COVID-19 safety
Search Finnair flights
British AirwaysCheapest$674Average$1,018FlexibilityNo cancel feeOn-time70%COVID-19 safety
Search British Airways flights

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
86%of flight departuresAfternoonNoon to 6 pm
13%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
Sunday15daily flights
Monday15daily flights
Tuesday6daily flights
Wednesday12daily flights
Thursday11daily flights
Friday15daily flights
Saturday11daily flights