What’s the top stopover airport for flights from London Heathrow Airport to Seattle?

Reykjavik (KEF) – chosen by Cheapflights users on 63% of one-stop itineraries from London Heathrow Airport to Seattle on Cheapflights.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Seattle?

Zurich (ZRH) is the most affordable one-stop option, with an average return flight price of £437.

What’s the fastest stopover option from London Heathrow Airport to Seattle?

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 13h 10m.

What is the most punctual flight time for London to Seattle flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Sunday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Seattle?

Flights via Helsinki (HEL) offer the fastest connection on this route, with an average stopover time of 1h 17m.

How often are flights from London to Seattle delayed?

About 15% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 127 minutes.

Which airline has the best punctuality record on London to Seattle flights?

Over the past year, Scandinavian Airlines have had the lowest number of delays on this route, with just 4% of flights being delayed.

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

Departing from London Heathrow Airport to Seattle will take you 12h 45m. The distance from London Heathrow Airport to Seattle is about 4783 mi. This flight may include one or multiple stops.

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

According to our current data, Icelandair (£358), Air France (£387), and Finnair (£400) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 38% lower than the current average price of a flight leaving 3 months from now.

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

The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as £410. However, be on the lookout for offers from United Airlines and British Airways, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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

The cheapest flight price from London Heathrow Airport to Seattle is £415. On average you can expect to pay £1,638. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £407.

What are the most reliable airlines from London Heathrow Airport to Seattle?

Consider Scandinavian Airlines (95%), KLM (87%) or Air France (87%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.

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

When booking a flight from London Heathrow Airport to Seattle, you may want to consider flying on Virgin Atlantic, British Airways or KLM as they are the most popular for this route.

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 center of Seattle. There are 14 flights from London Heathrow to Seattle/Tacoma Intl per day from 14 different airlines.

Can I find deals for flights from Heathrow to Seattle that include hotel bookings?

Yes. In addition to deals on Heathrow to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Heathrow to Seattle?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Seattle.

Can I find deals for business class flights from Heathrow to Seattle?

Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£406+ Flights from London Heathrow Airport to Seattle

Q: How much does it cost for a return flight from London Heathrow Airport to Seattle?

Airfare is below average for this route at the moment. London Heathrow Airport to Seattle flights typically cost between £491 and £645 in November. The cheapest return flight price found within the last 3 days was £446 on Icelandair (5 Nov-29 Apr).

Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or September, booked 76 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from Heathrow to Seattle

Round-trip from	£446
One-way from	£406
Popular in	December
Cheapest in	February
Average price	£566
Good round-trip deal	£527 or less
Good one-way deal	£516 or less

Icelandair
5/11-29/4
2 total stops
45h 40m total
London to Seattle

Search Deals

Aer Lingus
12/11
2 total stops
21h 28m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 2% potential increase in price (£11 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2025

Search Deals

Price to beat on a round-trip flight from London Heathrow to Seattle/Tacoma Intl.

Search Deals

Price to beat on a one-way flight from London Heathrow to Seattle/Tacoma Intl.

Search Deals

Find flight deals from Heathrow to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 October 2025.

Wed 5/1112:15LHR - SEA

1 stop12h 45mIcelandair

Wed 29/419:00SEA - LHR

1 stop32h 55mIcelandair

Deal found 22/10£446

Sun 14/1220:35LHR - SEA

1 stop28h 25mIcelandair

Tue 6/114:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 22/10£449

Wed 19/1112:15LHR - SEA

1 stop12h 45mIcelandair

Wed 26/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£450

Mon 3/1120:35LHR - SEA

1 stop28h 25mIcelandair

Mon 10/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£452

Wed 5/1112:15LHR - SEA

1 stop12h 45mIcelandair

Wed 12/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 21/10£455

Mon 10/1120:35LHR - SEA

1 stop28h 25mIcelandair

Mon 17/1114:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 22/10£456

Wed 19/1112:15LHR - SEA

1 stop12h 45mIcelandair

Tue 25/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£464

Tue 25/1112:15LHR - SEA

1 stop12h 45mIcelandair

Mon 1/1214:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 20/10£464

Tue 4/1112:15LHR - SEA

1 stop12h 45mIcelandair

Tue 11/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 21/10£465

Wed 12/1112:15LHR - SEA

1 stop12h 45mIcelandair

Thu 20/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£466

Mon 15/1220:35LHR - SEA

1 stop28h 25mIcelandair

Tue 6/114:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 22/10£467

Best flights from Heathrow to Seattle
Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 October 2025.

Thu 25/1206:30LHR - SEA

1 stop13h 20mDelta

Tue 30/1219:20SEA - LHR

Nonstop9h 30mDelta

Deal found 21/10£482

Wed 18/306:30LHR - SEA

1 stop13h 05mMultiple Airlines

Wed 25/317:40SEA - LHR

Nonstop9h 50mMultiple Airlines

Deal found 21/10£490

Thu 27/1112:15LHR - SEA

1 stop12h 45mIcelandair

Mon 1/1214:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 22/10£504

Tue 10/306:30LHR - SEA

1 stop13h 40mUnited Airlines

Tue 17/308:30SEA - LHR

2 stops17h 40mUnited Airlines

Deal found 21/10£506

Mon 29/1206:30LHR - SEA

2 stops19h 56mDelta

Wed 4/309:30SEA - LHR

2 stops16h 30mDelta

Deal found 21/10£494

Fri 7/1112:15LHR - SEA

1 stop12h 45mIcelandair

Thu 20/1114:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 22/10£506

Wed 18/306:35LHR - SEA

2 stops21h 42mUnited Airlines

Wed 25/307:00SEA - LHR

2 stops16h 40mUnited Airlines

Deal found 21/10£509

Fri 26/1206:30LHR - SEA

1 stop13h 20mDelta

Tue 30/1207:10SEA - LHR

1 stop19h 05mDelta

Deal found 21/10£498

Fri 12/1212:15LHR - SEA

1 stop12h 45mIcelandair

Thu 8/114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£506

Mon 29/1209:40LHR - SEA

1 stop33h 05mDelta

Tue 17/320:20SEA - LHR

Nonstop9h 30mDelta

Deal found 20/10£507

Mon 29/1206:30LHR - SEA

2 stops19h 56mDelta

Sun 15/209:40SEA - LHR

2 stops16h 35mDelta

Deal found 21/10£514

Direct flights from Heathrow to Seattle
Explore direct flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 23 October 2025.

Wed 24/1212:20LHR - SEA

Nonstop10h 38mVirgin Atlantic

Wed 31/1216:48SEA - LHR

Nonstop9h 42mVirgin Atlantic

Deal found 22/10£473

Tue 10/314:45LHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 17/317:40SEA - LHR

Nonstop9h 50mVirgin Atlantic

Deal found 21/10£487

Wed 24/1212:20LHR - SEA

Nonstop10h 38mDelta

Tue 30/1216:48SEA - LHR

Nonstop9h 42mDelta

Deal found 21/10£496

Mon 29/1212:20LHR - SEA

Nonstop10h 38mAir France

Tue 17/216:55SEA - LHR

Nonstop9h 35mAir France

Deal found 21/10£497

Tue 6/112:20LHR - SEA

Nonstop10h 25mDelta

Tue 20/116:45SEA - LHR

Nonstop9h 45mDelta

Deal found 22/10£502

Wed 7/112:20LHR - SEA

Nonstop10h 25mDelta

Thu 15/116:45SEA - LHR

Nonstop9h 45mDelta

Deal found 22/10£503

Tue 23/1214:45LHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 20/119:20SEA - LHR

Nonstop9h 30mVirgin Atlantic

Deal found 22/10£503

Wed 18/212:20LHR - SEA

Nonstop10h 25mVirgin Atlantic

Sat 7/316:45SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 21/10£506

Fri 26/1212:20LHR - SEA

Nonstop10h 38mDelta

Wed 31/1216:48SEA - LHR

Nonstop9h 42mDelta

Deal found 21/10£507

Thu 19/312:20LHR - SEA

Nonstop10h 25mAir France

Thu 26/317:40SEA - LHR

Nonstop9h 50mAir France

Deal found 21/10£509

Tue 6/112:20LHR - SEA

Nonstop10h 25mDelta

Sun 18/116:45SEA - LHR

Nonstop9h 45mDelta

Deal found 22/10£513

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 23 October 2025 and is based on user searches.

Mon 3/1120:35LHR - SEA

1 stop28h 25mIcelandair

Mon 10/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£452

Tue 4/1112:15LHR - SEA

1 stop12h 45mIcelandair

Tue 11/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 21/10£465

Wed 5/1112:15LHR - SEA

1 stop12h 45mIcelandair

Wed 29/419:00SEA - LHR

1 stop32h 55mIcelandair

Deal found 22/10£446

Wed 5/1112:15LHR - SEA

1 stop12h 45mIcelandair

Wed 12/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 21/10£455

Mon 10/1120:35LHR - SEA

1 stop28h 25mIcelandair

Mon 17/1114:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 22/10£456

Mon 10/1120:35LHR - SEA

1 stop28h 25mIcelandair

Mon 24/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£467

Wed 12/1112:15LHR - SEA

1 stop12h 45mIcelandair

Thu 20/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£466

Mon 17/1120:35LHR - SEA

1 stop28h 25mIcelandair

Sun 30/1114:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 22/10£473

Wed 19/1112:15LHR - SEA

1 stop12h 45mIcelandair

Wed 26/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£450

Wed 19/1112:15LHR - SEA

1 stop12h 45mIcelandair

Tue 25/1114:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/10£464

Tue 25/1112:15LHR - SEA

1 stop12h 45mIcelandair

Mon 1/1214:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 20/10£464

One-way flights from Heathrow to Seattle
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated 23 October 2025.

Wed 12/1109:50LHR - SEA

2 stops21h 28mAer Lingus

Deal found 20/10£406

Tue 4/1109:50LHR - SEA

2 stops21h 28mAer Lingus

Deal found 21/10£407

Wed 19/1108:15LHR - SEA

2 stops34h 10mMultiple Airlines

Deal found 20/10£408

Sun 23/1108:15LHR - SEA

3 stops34h 10mMultiple Airlines

Deal found 20/10£410

Thu 20/1113:40LHR - SEA

2 stops28h 45mMultiple Airlines

Deal found 20/10£412

Wed 10/1214:55LHR - SEA

Nonstop10h 00mAmerican Airlines

Deal found 21/10£413

Thu 11/1207:30LHR - SEA

3 stops23h 45mUnited Airlines

Deal found 21/10£414

Thu 11/1214:55LHR - SEA

Nonstop10h 00mAmerican Airlines

Deal found 21/10£416

Sun 14/1208:30LHR - SEA

1 stop35h 40mUnited Airlines

Deal found 21/10£417

Wed 26/1113:25LHR - SEA

2 stops28h 06mAir Canada

Deal found 21/10£419

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 25/12

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Tue 30/12

19:20-12:50

Nonstop9h 30m

£482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 18/3

06:30-12:35

1 stop13h 05m

Seattle/Tacoma Intl

Wed 25/3

17:40-10:30

Nonstop9h 50m

£490

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 29/12

06:30-18:26

2 stops19h 56m

Seattle/Tacoma Intl

Wed 4/3

09:30-10:00

2 stops16h 30m

£494

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 26/12

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Tue 30/12

07:10-10:15

1 stop19h 05m

£498

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 27/11

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Mon 1/12

14:35-19:30

1 stop20h 55m

£504

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 7/11

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Thu 20/11

14:35-19:30

1 stop20h 55m

£506

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 12/12

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Thu 8/1

14:35-10:50

1 stop12h 15m

£506

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/3

06:30-13:10

1 stop13h 40m

Seattle/Tacoma Intl

Tue 17/3

08:30-09:10

2 stops17h 40m

£506

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 29/12

09:40-10:45

1 stop33h 05m

Seattle/Tacoma Intl

Tue 17/3

20:20-12:50

Nonstop9h 30m

£507

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 18/3

06:35-21:17

2 stops21h 42m

Seattle/Tacoma Intl

Wed 25/3

07:00-06:40

2 stops16h 40m

£509

Flights are sorted by cheapest return flights first.

Deals found on 20/10

Showing 1-10 of 23 results

Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Seattle

Prices

Delays

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

The best time to book flights from London Heathrow Airport to Seattle is 76 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £355). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £504). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LHR to SEA?

It’s typically best to fly out from London Heathrow Airport to Seattle in the evening. Doing so could potentially save you 17% on the flight price compared to flying in the morning, which is usually more expensive.

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

Travellers seeking maximum savings on their London Heathrow Airport to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from London Heathrow Airport to Seattle?

Reviews of airlines servicing Seattle

See what other customers who have flown with KLM, Virgin Atlantic, andAir France from London Heathrow Airport to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.7

Good

1,404 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

KLM

7.7

Good

1,404 reviews

KLM

7.7

Good

1,404 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Virgin Atlantic

7.5

Good

670 reviews

KLM

7.7

Good

1,404 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Air France

7.4

Good

1,477 reviews

KLM

7.7

Good

1,404 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Icelandair

7.0

Good

560 reviews

KLM

7.7

Good

1,404 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

British Airways

6.7

Okay

7,467 reviews

KLM

7.7

Good

1,404 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

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 center of Seattle. There are 14 flights from London Heathrow to Seattle/Tacoma Intl per day from 14 different airlines.
How long is the flight from London Heathrow Airport to Seattle?
Departing from London Heathrow Airport to Seattle will take you 12h 45m. The distance from London Heathrow Airport to Seattle is about 4783 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
According to our current data, Icelandair (£358), Air France (£387), and Finnair (£400) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 38% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?
The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as £410. However, be on the lookout for offers from United Airlines and British Airways, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.
What are the most reliable airlines from London Heathrow Airport to Seattle?
Consider Scandinavian Airlines (95%), KLM (87%) or Air France (87%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.
What are the cheapest flights from London Heathrow Airport to Seattle?
The cheapest flight price from London Heathrow Airport to Seattle is £415. On average you can expect to pay £1,638. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £407.
Can I find deals for flights from Heathrow to Seattle that include hotel bookings?
Yes. In addition to deals on Heathrow to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Heathrow to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Seattle.
Can I find deals for business class flights from Heathrow to Seattle?
Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London Heathrow Airport to Seattle?
Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £355). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £504). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Tacoma

Leavenworth

Bothell

SeaTac

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Heathrow to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£358	Average£472	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£387	Average£592	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Finnair	Cheapest£400	Average£569	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Lufthansa	Cheapest£401	Average£499	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
KLM	Cheapest£407	Average£571	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£408	Average£644	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£443	Average£605	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£445	Average£589	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Delta	Cheapest£447	Average£627	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Aer Lingus	Cheapest£459	Average£664	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights

Fly with Cheapflights

How does Cheapflights help users find flights from Heathrow to Seattle?

Deals for Heathrow to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Seattle?

Cheapflights helps you find that perfect flight to Seattle from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Heathrow to Seattle with no change fees?

Need flexible booking options for your flight to Seattle from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Seattle become cheaper?

Yes! Start tracking prices for Heathrow to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from London Heathrow Airport to Seattle from £406

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or September, booked 76 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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Find flight deals from Heathrow to Seattle

Cheapest flights from Heathrow to SeattleExplore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 October 2025.

Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 October 2025.

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Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Seattle

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

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

What is the cheapest time of day to fly from LHR to SEA?

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

How much does it cost for a return flight from London Heathrow Airport to Seattle?

How often are flights from London to Seattle delayed?

What is the most punctual flight time for London to Seattle flights?

What day of the week experiences the fewest flight delays on this route?

Which airline has the best punctuality record on London to Seattle flights?

What’s the top stopover airport for flights from London Heathrow Airport to Seattle?

What’s the fastest stopover option from London Heathrow Airport to Seattle?

What’s the fastest stopover option from London Heathrow Airport to Seattle?

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Seattle?

Reviews of airlines servicing Seattle

See what other customers who have flown with KLM, Virgin Atlantic, andAir France from London Heathrow Airport to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

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

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

What are the most reliable airlines from London Heathrow Airport to Seattle?

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

Can I find deals for flights from Heathrow to Seattle that include hotel bookings?

How can I find direct flights from Heathrow to Seattle?

Can I find deals for business class flights from Heathrow to Seattle?

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

Travelling to a place near Seattle?

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Fly from Heathrow to Seattle on these airlines

Choose from the following airlines for your flight from Heathrow to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 23 October 2025.

Top 10 airlines flying from Heathrow to Seattle

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Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 October 2025.