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
Seattle/Tacoma Intl
London Heathrow
2 stops
25h 05mLondon Heathrow
Seattle/Tacoma Intl
2 stops
23h 44mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
2 stops
23h 40mLondon Heathrow
Seattle/Tacoma Intl
2 stops
23h 08mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
1 stop
12h 00mLondon Heathrow
Seattle/Tacoma Intl
1 stop
12h 40mIcelandair
Seattle to Heathrow 2022 flight deals
Cheap flights to Heathrow from Seattle found for this year
Seattle/Tacoma Intl
London Heathrow
2 stops
25h 05mLondon Heathrow
Seattle/Tacoma Intl
2 stops
23h 44mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
2 stops
23h 40mLondon Heathrow
Seattle/Tacoma Intl
2 stops
23h 08mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
1 stop
12h 00mLondon Heathrow
Seattle/Tacoma Intl
1 stop
12h 40mIcelandair
Non-stop flights to Heathrow from Seattle
Save time with Seattle to Heathrow direct flight deals
Seattle/Tacoma Intl
London Heathrow
Nonstop
9h 25mLondon Heathrow
Seattle/Tacoma Intl
Nonstop
10h 00mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
Nonstop
9h 15mLondon Heathrow
Seattle/Tacoma Intl
Nonstop
10h 05mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
Nonstop
9h 25mLondon Heathrow
Seattle/Tacoma Intl
Nonstop
10h 00mMultiple Airlines
Last minute flights from Seattle to Heathrow
Late deals on return flights to Heathrow from Seattle, departing today and this week
Seattle/Tacoma Intl
London Heathrow
1 stop
12h 00mLondon Heathrow
Seattle/Tacoma Intl
1 stop
12h 40mIcelandair
Seattle/Tacoma Intl
London Heathrow
1 stop
12h 00mLondon Heathrow
Seattle/Tacoma Intl
1 stop
12h 40mIcelandair
Seattle/Tacoma Intl
London Heathrow
1 stop
12h 00mLondon Heathrow
Seattle/Tacoma Intl
1 stop
12h 40mIcelandair
One-way flights to London Heathrow from Seattle
The cheapest one-way flights from Seattle to Heathrow
Seattle/Tacoma Intl
London Heathrow
1 stop
15h 20mWestJet
Seattle/Tacoma Intl
London Heathrow
1 stop
40h 05mWestJet
Seattle/Tacoma Intl
London Heathrow
1 stop
16h 45mMultiple Airlines
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.
Other flights from Seattle
Flights to Heathrow from Seattle
Can I fly to London Heathrow from Seattle/Tacoma Intl right now?
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?
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.
Hourly flight availability from Seattle to Heathrow
See what time of day planes typically take off from Seattle to Heathrow
| 1%of flight departures | Early morningMidnight to 6 am |
|---|---|
| 0%of flight departures | Morning6 am to noon |
| 41%of flight departures | AfternoonNoon to 6 pm |
| 58%of flight departures | Evening6 pm to midnight |
Weekly flight availability from Seattle to Heathrow
See how many times per day planes take to the skies headed from Seattle to Heathrow
| Sunday | 8daily flights |
|---|---|
| Monday | 10daily flights |
| Tuesday | 5daily flights |
| Wednesday | 10daily flights |
| Thursday | 3daily flights |
| Friday | 8daily flights |
| Saturday | 8daily flights |