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

Flights via Dublin (DUB) offer the fastest connection on this route, with an average stopover time of 2h 48m.

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

Dublin (DUB) – chosen by Cheapflights users on 52% of one-stop itineraries from Seattle to London Heathrow Airport on Cheapflights.

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

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 12h 43m.

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

Dublin (DUB) is the most affordable one-stop option, with an average return flight price of £504.

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

For as low as £466, Icelandair can have you in London Heathrow Airport from Seattle in 9h 45m. The distance from Seattle to London Heathrow Airport is about 4783 mi. This flight may include one or multiple stops.

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

Cheapflights users have booked flights from Seattle to London Heathrow Airport round-trip from £349. Other airlines that can offer you cheap pricing are British Airways, from £353, and Virgin Atlantic, from £366. You may be able to fly from Seattle to London Heathrow Airport for 41% less than the average price by searching for these airlines.

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

One-way options have recently been found by users for as low as £288 on WestJet. Other airlines that offer cheap prices include United Airlines from £293 and Lufthansa from £296 one-way.

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

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

Weekly flight availability from Seattle to London Heathrow Airport

The most flights from SEA to LHR are scheduled on a Monday (21 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (21 on average).

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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

While on average a flight from Seattle to London Heathrow Airport is generally £448, our data shows the cheapest flight currently is £281. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay £380 for that flight.

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

Consider Aeromexico (90%), KLM (83%) or Air France (83%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London Heathrow Airport.

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

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

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

If you book a flight to London Heathrow from Seattle, you will be flying from 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 21 flights from Seattle/Tacoma Intl to London Heathrow per day from 4 different airlines.

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

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

How can I find direct flights from Seattle to Heathrow?

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

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

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

£287+ Cheap Flights from Seattle to London Heathrow Airport

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in March or April, booked 32 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from Seattle to Heathrow

Round-trip from	£380
One-way from	£287
Popular in	June
Cheapest in	March
Average price	£525
Good round-trip deal	£492 or less
Good one-way deal	£324 or less

Icelandair
12/1-21/1
2 total stops
25h 00m total
Seattle to London

Search Deals

Aer Lingus
29/12
1 total stop
12h 45m total
Seattle to London

Search Deals

Highest demand for flights based on searches. 17% potential increase in price (£92 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

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

Search Deals

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

Search Deals

Find flight deals from Seattle to Heathrow

Cheapest flights from Seattle to Heathrow
Explore the most affordable flight options available from Seattle to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 September 2025.

Wed 15/1015:45SEA - LHR

1 stop12h 10mIcelandair

Wed 5/1112:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 28/9£380

Fri 14/1114:35SEA - LHR

1 stop12h 15mIcelandair

Thu 20/1120:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 28/9£382

Wed 5/1114:35SEA - LHR

1 stop12h 15mIcelandair

Tue 11/1112:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 28/9£383

Wed 12/1114:35SEA - LHR

1 stop20h 55mIcelandair

Wed 19/1120:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 28/9£388

Sun 26/1015:35SEA - LHR

1 stop12h 15mIcelandair

Tue 11/1112:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 28/9£391

Wed 5/1114:35SEA - LHR

1 stop12h 15mIcelandair

Wed 12/1112:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 28/9£395

Wed 19/1114:35SEA - LHR

1 stop20h 55mIcelandair

Tue 25/1120:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 28/9£395

Mon 6/1019:00SEA - LHR

1 stop32h 55mIcelandair

Wed 22/1021:25LHR - SEA

1 stop31h 15mIcelandair

Deal found 28/9£396

Thu 16/1019:00SEA - LHR

1 stop32h 55mIcelandair

Mon 3/1120:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 29/9£397

Tue 11/1114:35SEA - LHR

1 stop12h 15mIcelandair

Sun 16/1120:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 28/9£398

Best flights from Seattle to Heathrow
Discover carefully curated flight deals from Seattle to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 30 September 2025.

Fri 28/1114:35SEA - LHR

1 stop12h 15mIcelandair

Mon 8/1212:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 29/9£414

Tue 3/315:40SEA - LHR

1 stop12h 10mUnited Airlines

Fri 13/306:30LHR - SEA

1 stop13h 40mUnited Airlines

Deal found 29/9£460

Mon 27/1017:45SEA - LHR

Nonstop9h 45mDelta

Mon 3/1117:35LHR - SEA

1 stop25h 50mDelta

Deal found 29/9£466

Wed 15/1014:10SEA - LHR

2 stops19h 30mScandinavian Airlines

Tue 28/1006:40LHR - SEA

2 stops22h 45mScandinavian Airlines

Deal found 28/9£468

Sun 11/118:50SEA - LHR

Nonstop9h 30mBritish Airways

Thu 22/114:55LHR - SEA

Nonstop10h 00mBritish Airways

Deal found 28/9£473

Fri 5/1214:35SEA - LHR

1 stop12h 15mIcelandair

Mon 15/1220:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 29/9£449

Tue 18/1108:36SEA - LHR

2 stops16h 34mUnited Airlines

Thu 27/1106:30LHR - SEA

1 stop13h 40mUnited Airlines

Deal found 29/9£462

Tue 6/114:00SEA - LHR

2 stops20h 30mScandinavian Airlines

Tue 20/106:40LHR - SEA

2 stops23h 28mScandinavian Airlines

Deal found 28/9£468

Tue 18/1119:20SEA - LHR

Nonstop9h 30mDelta

Fri 28/1106:30LHR - SEA

1 stop13h 15mDelta

Deal found 28/9£501

Tue 2/1214:35SEA - LHR

1 stop20h 55mIcelandair

Sun 14/1220:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 29/9£486

Fri 14/1105:50SEA - LHR

1 stop22h 00mUnited Airlines

Fri 21/1113:25LHR - SEA

2 stops41h 03mUnited Airlines

Deal found 29/9£500

Fri 5/1214:35SEA - LHR

1 stop12h 15mIcelandair

Sun 14/1220:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 29/9£486

Direct flights from Seattle to Heathrow
Explore direct flight options from Seattle to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 30 September 2025.

Tue 11/1119:20SEA - LHR

Nonstop9h 30mVirgin Atlantic

Tue 18/1112:20LHR - SEA

Nonstop10h 28mVirgin Atlantic

Deal found 29/9£455

Mon 27/1020:20SEA - LHR

Nonstop9h 30mVirgin Atlantic

Tue 11/1114:45LHR - SEA

Nonstop10h 05mVirgin Atlantic

Deal found 29/9£460

Wed 25/218:50SEA - LHR

Nonstop9h 30mFinnair

Wed 11/314:55LHR - SEA

Nonstop10h 00mFinnair

Deal found 29/9£465

Sun 26/1017:45SEA - LHR

Nonstop9h 45mVirgin Atlantic

Tue 11/1112:20LHR - SEA

Nonstop10h 28mVirgin Atlantic

Deal found 28/9£467

Wed 12/1118:50SEA - LHR

Nonstop9h 30mBritish Airways

Wed 19/1114:55LHR - SEA

Nonstop10h 00mBritish Airways

Deal found 28/9£468

Tue 2/1218:50SEA - LHR

Nonstop9h 30mFinnair

Wed 10/1214:55LHR - SEA

Nonstop10h 00mFinnair

Deal found 28/9£469

Mon 2/318:50SEA - LHR

Nonstop9h 30mFinnair

Thu 12/314:55LHR - SEA

Nonstop10h 00mFinnair

Deal found 29/9£470

Wed 5/1118:50SEA - LHR

Nonstop9h 30mBritish Airways

Tue 18/1109:25LHR - SEA

Nonstop10h 05mBritish Airways

Deal found 29/9£473

Wed 25/319:50SEA - LHR

Nonstop9h 30mBritish Airways

Wed 8/416:30LHR - SEA

Nonstop9h 50mBritish Airways

Deal found 28/9£480

Tue 10/319:50SEA - LHR

Nonstop9h 30mBritish Airways

Thu 19/314:55LHR - SEA

Nonstop10h 00mBritish Airways

Deal found 29/9£485

Thu 13/1119:20SEA - LHR

Nonstop9h 30mVirgin Atlantic

Thu 20/1114:45LHR - SEA

Nonstop10h 05mVirgin Atlantic

Deal found 29/9£486

Last-minute flights from Seattle to Heathrow
Discover last-minute flight deals from Seattle to Heathrow. Data last updated 30 September 2025 and is based on user searches.

Mon 29/915:45SEA - LHR

1 stop20h 35mIcelandair

Thu 16/1021:25LHR - SEA

1 stop31h 15mIcelandair

Deal found 29/9£403

Sun 5/1015:45SEA - LHR

1 stop12h 10mIcelandair

Wed 22/1021:25LHR - SEA

1 stop28h 25mIcelandair

Deal found 29/9£395

Mon 6/1019:00SEA - LHR

1 stop32h 55mIcelandair

Wed 22/1021:25LHR - SEA

1 stop31h 15mIcelandair

Deal found 28/9£396

Tue 7/1015:45SEA - LHR

1 stop12h 10mIcelandair

Tue 14/1021:25LHR - SEA

1 stop28h 25mIcelandair

Deal found 28/9£395

Tue 7/1015:45SEA - LHR

1 stop12h 10mIcelandair

Wed 22/1021:25LHR - SEA

1 stop28h 25mIcelandair

Deal found 28/9£398

Tue 14/1012:45SEA - LHR

2 stops21h 45mScandinavian Airlines

Wed 22/1007:05LHR - SEA

2 stops14h 55mScandinavian Airlines

Deal found 28/9£410

Wed 15/1015:45SEA - LHR

1 stop12h 10mIcelandair

Wed 5/1112:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 28/9£380

Thu 16/1019:00SEA - LHR

1 stop32h 55mIcelandair

Mon 3/1120:35LHR - SEA

1 stop28h 25mIcelandair

Deal found 29/9£397

Sun 26/1015:35SEA - LHR

1 stop12h 15mIcelandair

Tue 11/1112:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 28/9£391

Tue 28/1015:35SEA - LHR

1 stop12h 15mIcelandair

Tue 4/1112:15LHR - SEA

1 stop12h 45mIcelandair

Deal found 28/9£411

One-way flights from Seattle to Heathrow
Search for one-way flight options from Seattle to Heathrow. Find affordable one-way fares based on user searches. Data last updated 30 September 2025.

Mon 29/1220:05SEA - LHR

1 stop12h 45mAer Lingus

Deal found 29/9£287

Wed 22/1022:55SEA - LHR

2 stops29h 10mWestJet

Deal found 30/9£288

Sun 2/1115:40SEA - LHR

2 stops31h 30mLufthansa

Deal found 29/9£289

Mon 12/111:55SEA - LHR

2 stops16h 55mWestJet

Deal found 28/9£290

Tue 7/1019:00SEA - LHR

1 stop32h 55mIcelandair

Deal found 28/9£292

Mon 1/1215:40SEA - LHR

1 stop12h 10mLufthansa

Deal found 28/9£293

Tue 4/1115:40SEA - LHR

1 stop12h 10mUnited Airlines

Deal found 29/9£293

Sun 5/1015:45SEA - LHR

1 stop20h 35mIcelandair

Deal found 28/9£296

Mon 29/1210:05SEA - LHR

1 stop17h 45mUnited Airlines

Deal found 29/9£296

Mon 6/1023:56SEA - LHR

1 stop25h 34mJetBlue

Deal found 29/9£297

Wed 22/1019:35SEA - LHR

1 stop16h 45mAer Lingus

Deal found 29/9£298

Sat 1/1123:59SEA - LHR

1 stop24h 31mUnited Airlines

Deal found 29/9£300

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 28/11

14:35-10:50

1 stop12h 15m

London Heathrow

Mon 8/12

12:15-17:00

1 stop12h 45m

£414

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 5/12

14:35-10:50

1 stop12h 15m

London Heathrow

Mon 15/12

20:35-17:00

1 stop28h 25m

£449

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 3/3

15:40-11:50

1 stop12h 10m

London Heathrow

Fri 13/3

06:30-13:10

1 stop13h 40m

£460

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 18/11

08:36-09:10

2 stops16h 34m

London Heathrow

Thu 27/11

06:30-12:10

1 stop13h 40m

£462

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 27/10

17:45-10:30

Nonstop9h 45m

London Heathrow

Mon 3/11

17:35-11:25

1 stop25h 50m

£466

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 15/10

14:10-17:40

2 stops19h 30m

London Heathrow

Tue 28/10

06:40-22:25

2 stops22h 45m

£468

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 6/1

14:00-18:30

2 stops20h 30m

London Heathrow

Tue 20/1

06:40-22:08

2 stops23h 28m

£468

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 11/1

18:50-12:20

Nonstop9h 30m

London Heathrow

Thu 22/1

14:55-16:55

Nonstop10h 00m

£473

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 2/12

14:35-19:30

1 stop20h 55m

London Heathrow

Sun 14/12

20:35-17:00

1 stop28h 25m

£486

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 5/12

14:35-10:50

1 stop12h 15m

London Heathrow

Sun 14/12

20:35-17:00

1 stop28h 25m

£486

Flights are sorted by cheapest return flights first.

Deals found on 30/9

Showing 1-10 of 23 results

Best time to book a flight from Seattle to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Seattle 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 Seattle to London Heathrow Airport

Prices

Airlines

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

The price you pay for your flight from Seattle to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 32 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of £112). Flying from Seattle to London Heathrow Airport in August is currently the most expensive (average of £164). 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 SEA to LHR?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 11% on flights from Seattle to London Heathrow Airport by exploring options for tickets in the morning.

Reviews of airlines servicing Heathrow

Read through reviews of airlines operating flights from Seattle to London Heathrow Airport, such as Virgin Atlantic, Aer Lingus, andIcelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Virgin Atlantic

7.4

Good

665 reviews

Check prices

Reviews

1 / 20

6.0

Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

Virgin Atlantic

7.4

Good

665 reviews

Virgin Atlantic

7.4

Good

665 reviews

Check prices

Reviews

1 / 20

6.0

Good

Pratap,Aug 2025

JFK - LHR

Aer Lingus

7.2

Good

1,302 reviews

Virgin Atlantic

7.4

Good

665 reviews

Check prices

Reviews

1 / 20

6.0

Good

Pratap,Aug 2025

JFK - LHR

Icelandair

7.0

Good

546 reviews

Virgin Atlantic

7.4

Good

665 reviews

Check prices

Reviews

1 / 20

6.0

Good

Pratap,Aug 2025

JFK - LHR

British Airways

6.7

Okay

7,410 reviews

Virgin Atlantic

7.4

Good

665 reviews

Check prices

Reviews

1 / 20

6.0

Good

Pratap,Aug 2025

JFK - LHR

Related info for your journey

What airport do you fly from for flights from Seattle to London Heathrow?
If you book a flight to London Heathrow from Seattle, you will be flying from 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 21 flights from Seattle/Tacoma Intl to London Heathrow per day from 4 different airlines.
How long is the flight from Seattle to London Heathrow Airport?
For as low as £466, Icelandair can have you in London Heathrow Airport from Seattle in 9h 45m. The distance from Seattle to London Heathrow Airport is about 4783 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Seattle to London Heathrow Airport round-trip?
Cheapflights users have booked flights from Seattle to London Heathrow Airport round-trip from £349. Other airlines that can offer you cheap pricing are British Airways, from £353, and Virgin Atlantic, from £366. You may be able to fly from Seattle to London Heathrow Airport for 41% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from Seattle to London Heathrow Airport one-way?
One-way options have recently been found by users for as low as £288 on WestJet. Other airlines that offer cheap prices include United Airlines from £293 and Lufthansa from £296 one-way.
What are the most reliable airlines from Seattle to London Heathrow Airport?
Consider Aeromexico (90%), KLM (83%) or Air France (83%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London Heathrow Airport.
What are the cheapest flights from Seattle to London Heathrow Airport?
While on average a flight from Seattle to London Heathrow Airport is generally £448, our data shows the cheapest flight currently is £281. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay £380 for that flight.
Can I find deals for flights from Seattle to Heathrow that include hotel bookings?
Yes. In addition to deals on Seattle to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Seattle to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Heathrow.
Can I find deals for business class flights from Seattle to Heathrow?
Yes. Cheapflights offers flight deals from Seattle to Heathrow 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 Seattle to London Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of £112). Flying from Seattle to London Heathrow Airport in August is currently the most expensive (average of £164). 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.

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Top 4 airlines flying from Seattle to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Aer Lingus	Cheapest£349	Average£511	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£353	Average£628	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£366	Average£626	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Icelandair	Cheapest£411	Average£493	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights

Fly with Cheapflights

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

Cheapflights helps you search for flights from Seattle to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights helps you find that perfect flight to Heathrow from Seattle 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 Seattle to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Heathrow with no change fees.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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Cheap flights from Seattle to London Heathrow Airport from £287

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 29/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in March or April, booked 32 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from Seattle to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Seattle to Heathrow

Cheapest flights from Seattle to HeathrowExplore the most affordable flight options available from Seattle to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 September 2025.

Explore the most affordable flight options available from Seattle to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 September 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Seattle to Heathrow

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

Cheapflights Insights

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

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

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

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

Weekly flight availability from Seattle to London Heathrow Airport

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

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

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

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

Reviews of airlines servicing Heathrow

Read through reviews of airlines operating flights from Seattle to London Heathrow Airport, such as Virgin Atlantic, Aer Lingus, andIcelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Heathrow. 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 from for flights from Seattle to London Heathrow?

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

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

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

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

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

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

How can I find direct flights from Seattle to Heathrow?

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

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

Travelling to a place near London Heathrow Airport?

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Alternative routes for Seattle to Heathrow

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Top 4 airlines flying from Seattle to Heathrow

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Cheapest flights from Seattle to Heathrow
Explore the most affordable flight options available from Seattle to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 September 2025.