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Cheap flights from London Heathrow Airport to Seattle from £305

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight to Seattle departing on 23/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
LHR — SEA
5 Mar — 12 Mar1
1 adult
Tue 5/3
Tue 12/3

The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in January or February, booked 45 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Heathrow to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 1 March 2024.

Popular in

July

Cheapest in

January

Round-trip from

£357

One-way from

£342
High demand for flights, 22% potential price rise
Best time to find cheap flights, 15% potential price drop
From London Heathrow to Seattle/Tacoma Intl
One-way flight from London Heathrow to Seattle/Tacoma Intl

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

Users have found that flying from London Heathrow Airport to Seattle on a Saturday 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 London Heathrow Airport to Seattle?

Find a great deal and save up to 24% by booking at least 49 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from London Heathrow Airport to Seattle within the next two weeks, with the cheapest ticket starting at £553.

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

Due to multiple factors, expect to potentially pay more when booking in July. For low rates, February can be a great choice for travel to Seattle. Flights to Seattle from London Heathrow Airport in February are about £527 on average during February, but can be found for as low as £342.

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

It’s typically best to fly out from London Heathrow Airport to Seattle in the morning. Doing so could potentially save you 7% on the flight price compared to flying in the afternoon, which is usually more expensive.

Cheap American Airlines flights from Heathrow to Seattle

Explore cheap flight options specifically provided by American Airlines for the route between Heathrow and Seattle. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 936,534 searches. Data last updated 1 March 2024.
Take a peek at the cheapest American Airlines flights we've detected travelling from London to Seattle. Make sure to check back often as deals are often changing.
Wed 13/314:50LHR - SEA
Nonstop9h 55mAmerican Airlines
Wed 20/305:15SEA - LHR
2 stops18h 00mAmerican Airlines
Deal found 29/2£426
Tue 12/309:25LHR - SEA
Nonstop10h 00mAmerican Airlines
Thu 21/305:15SEA - LHR
2 stops17h 40mAmerican Airlines
Deal found 28/2£427
Wed 13/312:25LHR - SEA
2 stops18h 32mAmerican Airlines
Wed 20/305:15SEA - LHR
2 stops18h 00mAmerican Airlines
Deal found 29/2£431
Tue 12/314:10LHR - SEA
1 stop36h 07mAmerican Airlines
Thu 21/305:15SEA - LHR
2 stops17h 40mAmerican Airlines
Deal found 28/2£432
Tue 12/318:20LHR - SEA
2 stops31h 57mAmerican Airlines
Tue 19/314:35SEA - LHR
Nonstop9h 25mAmerican Airlines
Deal found 29/2£473
Tue 5/314:50LHR - SEA
Nonstop9h 55mAmerican Airlines
Tue 12/306:00SEA - LHR
1 stop18h 00mAmerican Airlines
Deal found 27/2£484
Tue 12/309:25LHR - SEA
Nonstop10h 00mAmerican Airlines
Mon 18/300:59SEA - LHR
1 stop23h 21mAmerican Airlines
Deal found 29/2£486
Fri 15/318:50LHR - SEA
1 stop33h 33mAmerican Airlines
Thu 21/305:15SEA - LHR
2 stops17h 40mAmerican Airlines
Deal found 28/2£488
Thu 7/314:50LHR - SEA
Nonstop9h 55mAmerican Airlines
Mon 11/300:59SEA - LHR
1 stop22h 21mAmerican Airlines
Deal found 28/2£518
  • One of the most popular airlines travelling from London Heathrow Airport to Seattle is American Airlines. Flights from American Airlines travelling this route typically cost £682.23 RT. This price is typically 62% cheaper than other airlines that offer London Heathrow Airport to Seattle flights. When booking this route, the cheapest RT price found was £352. The most popular departure airport in London Heathrow Airport when flying to Seattle is London Heathrow Airport. The most popular airport to fly into when visiting Seattle is Seattle/Tacoma Intl Airport. When flying from London Heathrow Airport to Seattle, American Airlines flights are 7% more popular than any other airline flying that same route.

Cheap Air Canada flights from Heathrow to Seattle

Explore cheap flight options specifically provided by Air Canada for the route between Heathrow and Seattle. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 936,534 searches. Data last updated 1 March 2024.
To aid your search, here are some of the cheapest Air Canada flights we've found from London to Seattle. Deals frequently update to provide users with more options.
Mon 11/315:00LHR - SEA
2 stops25h 16mAir Canada
Tue 19/305:50SEA - LHR
2 stops17h 40mAir Canada
Deal found 29/2£443
Mon 11/312:00LHR - SEA
1 stop15h 43mAir Canada
Tue 19/309:35SEA - LHR
1 stop16h 45mAir Canada
Deal found 28/2£455
Tue 12/313:25LHR - SEA
2 stops26h 51mAir Canada
Tue 19/305:50SEA - LHR
2 stops18h 20mAir Canada
Deal found 29/2£470
Tue 5/313:25LHR - SEA
2 stops27h 51mAir Canada
Tue 12/315:20SEA - LHR
1 stop13h 30mAir Canada
Deal found 27/2£470
Mon 15/414:10LHR - SEA
1 stop12h 17mAir Canada
Wed 24/415:20SEA - LHR
1 stop14h 00mAir Canada
Deal found 28/2£472
Thu 7/315:00LHR - SEA
2 stops26h 16mAir Canada
Tue 12/305:50SEA - LHR
2 stops17h 40mAir Canada
Deal found 28/2£474
Wed 6/313:00LHR - SEA
1 stop15h 43mAir Canada
Sun 10/309:55SEA - LHR
2 stops18h 25mAir Canada
Deal found 28/2£480
Sat 9/311:10LHR - SEA
2 stops18h 46mAir Canada
Wed 13/315:20SEA - LHR
1 stop13h 30mAir Canada
Deal found 28/2£495
Sun 10/312:00LHR - SEA
1 stop15h 43mAir Canada
Sun 17/319:05SEA - LHR
2 stops28h 25mAir Canada
Deal found 28/2£503
  • Air Canada is one of the most popular airlines used for those travelling from London Heathrow Airport to Seattle. Flights from Air Canada travelling this route typically cost £677.82 RT. This price is typically 65% more expensive than other airlines that offer London Heathrow Airport to Seattle flights. When booking this route, the cheapest RT price found was £484. The most popular departure airport in London Heathrow Airport when flying to Seattle is London Heathrow Airport. The most popular airport to fly into when visiting Seattle is Seattle/Tacoma Intl Airport. When flying from London Heathrow Airport to Seattle, Air Canada flights are 3% more popular than any other airline flying that same route.

Cheap Heathrow to Seattle flights in March & April 2024

Find cheap flight options from Heathrow to Seattle specifically for the months of March and April 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 936,534 searches. Prices were last updated on 1 March 2024.
Scroll through some of the best deals on flights from London to Seattle in 2024. Check back soon for alternative fares.
Tue 12/309:25LHR - SEA
Nonstop10h 00mAmerican Airlines
Thu 21/305:15SEA - LHR
2 stops17h 40mAmerican Airlines
Deal found 28/2£427
Tue 12/314:10LHR - SEA
1 stop36h 07mAmerican Airlines
Thu 21/305:15SEA - LHR
2 stops17h 40mAmerican Airlines
Deal found 28/2£432
Tue 12/306:30LHR - SEA
1 stop13h 35mMultiple Airlines
Thu 21/318:55SEA - LHR
Nonstop9h 45mMultiple Airlines
Deal found 28/2£444
Mon 11/312:00LHR - SEA
1 stop15h 43mAir Canada
Tue 19/309:35SEA - LHR
1 stop16h 45mAir Canada
Deal found 28/2£455
Mon 11/306:20LHR - SEA
1 stop15h 50mVirgin Atlantic
Tue 19/317:15SEA - LHR
Nonstop9h 25mVirgin Atlantic
Deal found 28/2£461
Wed 13/306:30LHR - SEA
1 stop13h 20mMultiple Airlines
Tue 19/307:00SEA - LHR
1 stop15h 55mMultiple Airlines
Deal found 28/2£464
Tue 12/306:50LHR - SEA
2 stops20h 38mUnited Airlines
Tue 19/308:23SEA - LHR
1 stop18h 17mUnited Airlines
Deal found 29/2£466
Wed 6/306:50LHR - SEA
2 stops21h 24mUnited Airlines
Wed 13/306:35SEA - LHR
1 stop17h 55mUnited Airlines
Deal found 28/2£467
Thu 7/312:00LHR - SEA
1 stop16h 43mAir Canada
Thu 14/305:50SEA - LHR
2 stops18h 20mAir Canada
Deal found 29/2£468

Heathrow to Seattle 2024 flight deals

Discover exclusive flight deals for travel between Heathrow and Seattle in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 936,534 searches. Data last updated 1 March 2024.
Scroll through some of the best deals on flights from London to Seattle in 2024. Check back soon for alternative fares.
Tue 12/309:25LHR - SEA
Nonstop10h 00mAmerican Airlines
Thu 21/305:15SEA - LHR
2 stops17h 40mAmerican Airlines
Deal found 28/2£427
Tue 12/314:10LHR - SEA
1 stop36h 07mAmerican Airlines
Thu 21/305:15SEA - LHR
2 stops17h 40mAmerican Airlines
Deal found 28/2£432
Tue 12/306:30LHR - SEA
1 stop13h 35mMultiple Airlines
Thu 21/318:55SEA - LHR
Nonstop9h 45mMultiple Airlines
Deal found 28/2£444
Mon 11/312:00LHR - SEA
1 stop15h 43mAir Canada
Tue 19/309:35SEA - LHR
1 stop16h 45mAir Canada
Deal found 28/2£455
Tue 9/412:45LHR - SEA
Nonstop9h 55mMultiple Airlines
Wed 24/416:30SEA - LHR
Nonstop9h 20mMultiple Airlines
Deal found 28/2£457
Tue 19/1120:25LHR - SEA
1 stop28h 35mIcelandair
Tue 3/1214:35SEA - LHR
1 stop12h 20mIcelandair
Deal found 28/2£459
Mon 11/306:20LHR - SEA
1 stop15h 50mVirgin Atlantic
Tue 19/317:15SEA - LHR
Nonstop9h 25mVirgin Atlantic
Deal found 28/2£461
Wed 13/306:30LHR - SEA
1 stop13h 20mMultiple Airlines
Tue 19/307:00SEA - LHR
1 stop15h 55mMultiple Airlines
Deal found 28/2£464
Tue 16/406:30LHR - SEA
1 stop13h 55mUnited Airlines
Mon 22/416:43SEA - LHR
1 stop13h 27mUnited Airlines
Deal found 28/2£465

Direct flights to Seattle from Heathrow

Discover direct flight options from Heathrow to Seattle. Find direct flights with no stopovers, providing a convenient travel experience. Explore direct flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 936,534 searches. Data last updated 1 March 2024.
Consider booking one of these non-stop flights heading from London to Seattle. If you're looking for other options for flights from London to Seattle, make sure to update the search form at the top of page.
Tue 12/312:25LHR - SEA
Nonstop9h 55mKLM
Thu 21/318:55SEA - LHR
Nonstop9h 45mKLM
Deal found 28/2£455
Tue 9/412:45LHR - SEA
Nonstop9h 55mMultiple Airlines
Wed 24/416:30SEA - LHR
Nonstop9h 20mMultiple Airlines
Deal found 28/2£457
Mon 8/412:45LHR - SEA
Nonstop9h 55mVirgin Atlantic
Mon 22/416:30SEA - LHR
Nonstop9h 20mVirgin Atlantic
Deal found 29/2£466
Mon 8/415:55LHR - SEA
Nonstop10h 20mMultiple Airlines
Mon 22/419:45SEA - LHR
Nonstop9h 45mMultiple Airlines
Deal found 29/2£476
Mon 8/415:55LHR - SEA
Nonstop10h 20mVirgin Atlantic
Mon 22/416:30SEA - LHR
Nonstop9h 20mVirgin Atlantic
Deal found 29/2£479
Tue 12/314:50LHR - SEA
Nonstop9h 55mBritish Airways
Tue 19/319:45SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 29/2£481
Tue 12/314:50LHR - SEA
Nonstop9h 55mBritish Airways
Tue 19/314:35SEA - LHR
Nonstop9h 25mBritish Airways
Deal found 28/2£481
Tue 12/316:35LHR - SEA
Nonstop10h 25mVirgin Atlantic
Thu 21/318:55SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 29/2£485
Tue 12/312:25LHR - SEA
Nonstop9h 55mVirgin Atlantic
Thu 21/318:55SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 28/2£485

Heathrow to Seattle flights leaving soon

Find last-minute flight options from Heathrow to Seattle for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 936,534 searches. Data last updated 1 March 2024.
Have a look at some of the flights available from London to Seattle departing last-minute. Users should examine the flight details to ensure there are no surprises.
Wed 6/306:50LHR - SEA
2 stops21h 24mUnited Airlines
Wed 13/306:35SEA - LHR
1 stop17h 55mUnited Airlines
Deal found 28/2£467
Tue 5/313:25LHR - SEA
2 stops27h 51mAir Canada
Tue 12/315:20SEA - LHR
1 stop13h 30mAir Canada
Deal found 27/2£470
Thu 7/315:00LHR - SEA
2 stops26h 16mAir Canada
Tue 12/305:50SEA - LHR
2 stops17h 40mAir Canada
Deal found 28/2£474
Wed 6/306:30LHR - SEA
1 stop13h 35mDelta
Mon 11/314:10SEA - LHR
1 stop13h 20mDelta
Deal found 28/2£474
Wed 6/306:30LHR - SEA
1 stop13h 35mDelta
Wed 13/317:15SEA - LHR
Nonstop9h 25mDelta
Deal found 28/2£475
Wed 6/313:00LHR - SEA
1 stop15h 43mAir Canada
Sun 10/309:55SEA - LHR
2 stops18h 25mAir Canada
Deal found 28/2£480
Tue 5/316:35LHR - SEA
Nonstop10h 30mVirgin Atlantic
Tue 12/318:55SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 29/2£481
Tue 5/316:35LHR - SEA
Nonstop10h 30mDelta
Tue 12/318:55SEA - LHR
Nonstop9h 45mDelta
Deal found 27/2£481
Tue 5/311:35LHR - SEA
1 stop14h 31mUnited Airlines
Thu 14/309:35SEA - LHR
1 stop13h 55mUnited Airlines
Deal found 27/2£483

One-way flights to Seattle from Heathrow

Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 936,534 searches. Data last updated 1 March 2024.
If you're seeking multiple options on one-way flights from London to Seattle, be sure to check out these deals, which are updated often. Those needing a return flight from London to Seattle can use the search form above.
Tue 23/407:40LHR - SEA
3 stops33h 05mMultiple Airlines
Deal found 29/2£305
Mon 15/420:50LHR - SEA
3 stops51h 50mMultiple Airlines
Deal found 29/2£329
Mon 8/419:15LHR - SEA
3 stops45h 30mMultiple Airlines
Deal found 27/2£333
Wed 20/312:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 28/2£342
Wed 19/615:30LHR - SEA
3 stops36h 51mMultiple Airlines
Deal found 28/2£351
Mon 15/420:50LHR - SEA
2 stops45h 44mMultiple Airlines
Deal found 29/2£357
Sun 21/422:00LHR - SEA
3 stops42h 45mMultiple Airlines
Deal found 29/2£364
Sat 8/621:40LHR - SEA
1 stop21h 40mIcelandair
Deal found 28/2£366
Mon 27/521:25LHR - SEA
1 stop21h 55mIcelandair
Deal found 28/2£376

Find flights from Heathrow to Seattle within your budget

Customise your flight search to find flights from Heathrow to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 936,534 searches. Data last updated 1 March 2024.

Fly from

Any airport

Fly to

Any airport

Budget

£426 - £481

Route

Depart

Return

Price

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Wed 13/3

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 20/3

2 stops18h 00m

£426

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Mon 11/3

2 stops25h 16m

Seattle/Tacoma Intl

Tue 19/3

2 stops17h 40m

£443

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Tue 12/3

1 stop13h 35m

Seattle/Tacoma Intl

Thu 21/3

Nonstop9h 45m

£444

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Mon 11/3

1 stop14h 05m

Seattle/Tacoma Intl

Tue 19/3

Nonstop9h 45m

£447

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Mon 11/3

1 stop15h 50m

Seattle/Tacoma Intl

Tue 19/3

Nonstop9h 25m

£461

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Tue 16/4

1 stop13h 55m

Seattle/Tacoma Intl

Mon 22/4

1 stop13h 27m

£465

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Tue 12/3

1 stop13h 35m

Seattle/Tacoma Intl

Tue 19/3

Nonstop9h 45m

£471

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Mon 11/3

1 stop13h 35m

Seattle/Tacoma Intl

Mon 18/3

1 stop13h 30m

£474

London HeathrowSeattle/Tacoma Intl

LHR - SEA

LHRSEA

London Heathrow

Tue 12/3

Nonstop9h 55m

Seattle/Tacoma Intl

Tue 19/3

Nonstop9h 20m

£481

Flights are sorted by cheapest first

Deals found on 29/2

When is the best time to book a flight from London Heathrow Airport to Seattle?

Use this chart to determine the optimal time to book a return flight from Heathrow to Seattle. Price data was last updated on 28 January 2024.
The best time to book flights from London Heathrow Airport to Seattle is 45 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.
Search Deals

When is the cheapest time to fly from London Heathrow Airport to Seattle?

Use this chart to determine the cheapest time to fly return from Heathrow to Seattle. Price data was last updated on 25 February 2024.
Morning
Midday
Afternoon
Evening
All times are departure.
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 evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Seattle by month

Plan your trip from Heathrow to Seattle by taking into account the cheapest months to travel. The average price of a one-way flight from Heathrow to Seattle is currently £347 while a return flight costs £457. Price data was last updated on 25 February 2024.

Currently, December is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £570). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £780). 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.

January

£481

February

£470

March

£490

April

£489

May

£511

June

£561

July

£617

August

£594

September

£543

October

£511

November

£466

December

£451

Temperature and rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average temperature and rainfall totals by month.

SEA

Temperature

5 - 19 °C

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 1 March 2024.
Get a feel of what it's like to fly with American Airlines, Air Canada and Air France from London to Seattle by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very Good
11,818 reviews

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Comfort

7.9

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

8.1
Very Good
11,818 reviews
8.1
Very Good
11,818 reviews

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Comfort

7.9

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.8
Good
1,766 reviews
8.1
Very Good
11,818 reviews

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Comfort

7.9

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.8
Good
769 reviews
8.1
Very Good
11,818 reviews