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

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The best prices from Seattle to Heathrow are usually found in April or October, booked 60 days in advance, depart on a Tuesday or Monday and return on a Friday

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

SEA - LHR
Price
$529 - $1,016
LHR
Temperature
46.4 - 75.2 °F
LHR
Rainfall
1.5 - 2.6 inches

Popular in

June

High demand for flights, 35% potential price rise

Cheapest in

April

Best time to find cheap flights, 20% potential price drop

Round-trip from

$529

From Seattle to Heathrow

One-way from

$305

One-way flight from Seattle to Heathrow

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Seattle to Heathrow?

Users have found that flying from Seattle to Heathrow on a Thursday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 51 days in advance, which can save you up to 38% on flights from Seattle to Heathrow compared to booking the week you need them. Waiting 51 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 $813. For sooner than that we have options available in the next 3 days from $886.

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

A simple way to save on the total cost of your ticket is to fly from Seattle to Heathrow in the morning. If you’re flexible enough to do this you can expect to save up to 9% on your trip compared to booking a flight in the evening.

Cheap flights from Seattle to Heathrow in October, November 2020

The best prices found for SEA to LHR flights for October, November
22 Nov - 27 Nov
$548pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
30 Nov - 12 Dec
$557pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
30 Nov - 12 Dec
$561pp
SEA
Seattle/Tacoma Intl
Delta
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle to Heathrow 2020 flight deals

Cheap flights to Heathrow from Seattle found for this year
28 Dec - 11 Jan
$529pp
SEA
Seattle/Tacoma Intl
Delta
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
28 Dec - 14 Jan
$530pp
SEA
Seattle/Tacoma Intl
Delta
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
1 Dec - 9 Dec
$533pp
SEA
Seattle/Tacoma Intl
Delta
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl

Non-stop flights to Heathrow from Seattle

Save time with Seattle to Heathrow direct flight deals
12 Dec - 26 Dec
$606pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Iberia
Non-Stop
SEA
Seattle/Tacoma Intl
18 Dec - 17 Jan
$618pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
18 Dec - 8 Jan
$619pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Heathrow

Late deals on round-trip flights to Heathrow from Seattle, departing today and this week
1 Nov - 13 Nov
$689pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
     
3 STOPS
SEA
Seattle/Tacoma Intl
1 Nov - 13 Nov
$701pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Lufthansa
 
1 STOP
SEA
Seattle/Tacoma Intl
4 Nov - 25 Nov
$715pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl

One-way flights to Heathrow from Seattle

The cheapest one-way flights from Seattle to Heathrow
6:57 pm - 4:35 pm
TAP AIR PORTUGAL
3 Stops
37h 38m
SEA - LHR
TAP AIR PORTUGAL
1:25 pm - 6:50 am
Iberia
Nonstop
9h 25m
SEA - LHR
Iberia
$310
StudentUniverse
3:00 pm - 7:40 am
Multiple Airlines
3 Stops
32h 40m
SEA - LHR
Multiple Airlines
$327
Kiwi.com

Related info for your journey

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

Flight FAQs

From Seattle to Heathrow

Are flight prices decreasing from Seattle to Heathrow due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Seattle and Heathrow for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from Seattle/Tacoma Intl to London Heathrow to control the spread of COVID-19?

Airlines globally have implemented additional safety measures to accommodate you. Delta is one of them. Some of the new policies that have been implemented to accommodate travelers flying from Seattle/Tacoma Intl to London Heathrow are improved sanitation, HEPA filters, mask requirements, social distance seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline.

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 Heathrow for under $600 on Cheapflights?

Yes, there are multiple flights from Seattle to Heathrow for under $600. The cheapest flight booked recently is on Aeromexico for just $527, but on average you can expect to pay $539.

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

Cheapflights has at least 20 direct flights from Seattle to Heathrow under $700. A good price for a nonstop flight from Seattle to Heathrow is less than $628.

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

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

Does it rain more in Seattle or Heathrow?

When traveling, we recommend packing in preparation to handle common weather conditions. The rainfall in Seattle is typically greater than that of Heathrow. We can gather that this will continue over the next 19 days.

Is Seattle weather warmer or cooler than Heathrow?

With an average temperature of 77 °F, peak weather can be found in July. As a traveler, expect to see changes in flight prices during that period. The temperatures in Heathrow are colder than in Seattle.

How long is the flight from Seattle to Heathrow?

A quick flight from Seattle to Heathrow can take about 9h 15m. Delta provides one of the quickest options available for as low as $529. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

Currently priced at $527, Aeromexico will fly you from Seattle to Heathrow and back. In addition to Aeromexico, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and Icelandair - these airlines can fly you to your destination from $529 and $547, respectively. You may be able to fly from Seattle to Heathrow for 20% less than the average price by searching for these airlines.

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

The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as $283. Check flights for Iberia, as they currently have the next best price.

Alternative routes for Seattle to Heathrow

Destination information for Heathrow

Things to know before you go. Useful info for your trip from Seattle to Heathrow
Today's exchange rate
$1 = £0.77
Average temperature for October in Heathrow
60.8 °F
Avg rainfall for October in Heathrow
2.6 ″

Airports servicing Seattle

Airports servicing London

Hourly flight availability from Seattle to Heathrow

Evening 6 PM to midnight 100% of SEA to LHR departures
Early morning Midnight to 6 AM 0% of SEA to LHR departures
Morning 6 AM to noon 0% of SEA to LHR departures
Afternoon Noon to 6 PM 0% of SEA to LHR departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Heathrow
Sunday
5 daily flights
Monday
0 flights
Tuesday
0 flights
Wednesday
5 daily flights
Thursday
0 flights
Friday
5 daily flights
Saturday
0 flights