Cheap flights from Heathrow to Seattle

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

All the information you need to plan the best LHR to SEA flight in 2021: compare Heathrow to Seattle flight prices with the expected peak season, weather and rainfall in Seattle.
LHR - SEA
Price
£306 - £565
SEA
Temperature
8 - 25 °C
SEA
Precipitation
18 - 166 mm

Popular in

July

High demand for flights, 28% potential price rise

Cheapest in

February

Best time to find cheap flights, 25% potential price drop

Round-trip from

£306

From Heathrow to Seattle

One-way from

£148

One-way flight from Heathrow to Seattle

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
How far in advance should I book a flight from Heathrow to Seattle?

To save on the cost of your flight from Heathrow to Seattle, book at least 52 days before your planned departure. Booking around this time can save you about 51% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £445 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £583.

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

Flights from Heathrow to Seattle lean towards being more expensive in July. Prices are generally better when you fly from Heathrow to Seattle in February, with the cheapest ticket starting at £259.

Cheap flights from Heathrow to Seattle in August, September 2021

The best prices found for LHR to SEA flights in August, September
11 Sep - 17 Oct
£390pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
 
1 STOP
LHR
London Heathrow
29 Aug - 11 Sep
£393pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
 
1 STOP
LHR
London Heathrow
24 Aug - 9 Sep
£394pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
 
1 STOP
LHR
London Heathrow

Heathrow to Seattle 2021 flight deals

Cheap flights to Seattle from Heathrow found for this year
4 Oct - 18 Oct
£377pp
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
6 Oct - 20 Oct
£380pp
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
1 Nov - 8 Nov
£381pp
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow

Direct flights to Seattle from Heathrow

Save time with Heathrow to Seattle direct flight deals
11 Jan - 17 Jan
£406pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow
1 Nov - 8 Nov
£416pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow
15 Sep - 20 Sep
£431pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow

Last-minute flights from Heathrow to Seattle

Late deals on return flights to Seattle from Heathrow, departing today and this week
9 Aug - 31 Aug
£503pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Lufthansa
 
1 STOP
LHR
London Heathrow
14 Aug - 28 Aug
£508pp
LHR
London Heathrow
Lufthansa
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Lufthansa
 
1 STOP
LHR
London Heathrow
14 Aug - 28 Aug
£508pp
LHR
London Heathrow
Lufthansa
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Lufthansa
   
2 STOPS
LHR
London Heathrow

One-way flights to Seattle from Heathrow

The cheapest one-way flights from Heathrow to Seattle
04:40 - 06:35
British Airways
Direct
9h 55m
LHR - SEA
British Airways
£149
Netflights
07:05 - 16:23
Brussels Airlines
2 stops
41h 18m
LHR - SEA
Brussels Airlines
10:10 - 17:27
SWISS
1 stop
15h 17m
LHR - SEA
SWISS
£318
World Air Fares

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Heathrow</span> to <span class="emphasized">Seattle</span> flights.

Flight FAQs

From Heathrow to Seattle

Are flight prices decreasing from Heathrow to Seattle 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 Heathrow and Seattle 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.

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

Some of our airline partners flying from London Heathrow to Seattle/Tacoma Intl have new flexible policies in place due to COVID-19. British Airways, Virgin Atlantic, and United Airlines 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.

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

If you book a flight to Seattle from London Heathrow, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the centre of Seattle. There are 2 flights from London Heathrow to Seattle/Tacoma Intl per day from 17 different airlines.

Can I find flights from Heathrow to Seattle for under £359 on Cheapflights?

Yes, there are multiple flights from Heathrow to Seattle for under £359. The cheapest flight booked recently is on Icelandair for just £347, but on average you can expect to pay £392.

Are there direct flights from Heathrow to Seattle for under £431 on Cheapflights?

Cheapflights has 20 direct flights from Heathrow to Seattle under £431. A good price for a direct flight from Heathrow to Seattle is less than £453.

Are there last-minute flights available from Heathrow to Seattle for under £503?

There are currently 20+ open flights from Heathrow to Seattle within the next 7 days for less than £503.

Does it rain more in Heathrow or Seattle?

In Heathrow, there will be greater rainfall in Heathrow compared to Seattle over the next 17 days.

Is Heathrow weather warmer or cooler than Seattle?

With an average temperature of 25 °C, peak weather can be found in July. As a traveller, expect to see changes in flight prices during that period. The temperatures in Seattle are hotter than in Heathrow.

How long does is the flight from Heathrow to Seattle?

There are many flights that can get you from Heathrow to Seattle in 12h 36m. Fly via Virgin Atlantic, Icelandair, or Lufthansa to get the fastest option. This flight may include one or multiple stops.

What are the cheapest airlines to flying from Heathrow to Seattle return?

Currently priced at £347, Icelandair will fly you from Heathrow to Seattle and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Virgin Atlantic and Air Canada - these airlines can fly you to your destination from £399 and £404, respectively. These flights start at 14% lower than the current average price 3 months from now.

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

To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £35. Lufthansa flights start at £279 while deals on SWISS start at £281 one-way.

Alternative routes for Heathrow to Seattle

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

Destination information for Seattle

Things to know before you go - useful duration and weather info for your trip from Heathrow to Seattle.
Today's exchange rate
£1 = $1.40
Average temperature for August in Seattle
25.0 °C
Avg rainfall for August in Seattle
28.0 mm

Airports servicing London

Airports servicing Seattle

Top 10 airlines flying from Heathrow to Seattle

The chart below displays the airlines Cheapflights users travelling from Heathrow to Seattle choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Austrian Airlines
£311 £439 No cancel fee 78%
Search Austrian Airlines flights
United Airlines
£335 £535 No cancel fee 69%
Search United Airlines flights
Lufthansa
£374 £625 No cancel fee 76%
Search Lufthansa flights
Air Canada
£358 £634 No cancel fee 67%
Search Air Canada flights
SWISS
£510 £666 No cancel fee 79%
Search SWISS flights
American Airlines
£408 £667 No cancel fee 71%
Search American Airlines flights
Iberia
£402 £690 No cancel fee 77%
Search Iberia flights
KLM
£388 £697 No cancel fee 75%
Search KLM flights
Icelandair
£465 £715 No cancel fee 76%
Search Icelandair flights
Aer Lingus
£537 £738 No cancel fee N/A
Search Aer Lingus flights

Hourly flight availability from Heathrow to Seattle

See what time of day planes typically take off from Heathrow towards Seattle.
Afternoon Midday to 6 PM 100% of flight departures
Early morning Midnight to 6 AM 0% of flight departures
Morning 6 AM to midday 0% of flight departures
Evening 6 PM to midnight 0% of flight departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Heathrow to Seattle
See how many times per day planes take to the skies headed from Heathrow to Seattle.
Sunday
5 daily flights
Monday
5 daily flights
Tuesday
0 flights
Wednesday
5 daily flights
Thursday
0 flights
Friday
5 daily flights
Saturday
0 flights
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