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Cheap flights from Seattle (SEA) to Heathrow (LHR) from $242

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 10/8. 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.
SEA — LHR
May 2 — May 91
From?
To?
Thu 5/2
Thu 5/9
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in February or January, booked 62 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from Seattle to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Heathrow (LHR). 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 April 27, 2024.

Popular in

June

Cheapest in

February

Round-trip from

$644

One-way from

$242
High demand for flights, 24% potential price rise
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Best time to find cheap flights, 23% potential price drop
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From Seattle/Tacoma Intl to London Heathrow
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One-way flight from Seattle/Tacoma Intl to London Heathrow
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What is the cheapest day to fly round-trip from Seattle to London Heathrow Airport?

Departing on a Tuesday is a good option for securing a great price. You can expect to save up to 15% when planning your travel around this day of the week.

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

To save up to 39% on this flight, we recommend booking at least 59 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Seattle to London Heathrow Airport from $866 1-2 weeks out and tickets from $1,144 for flights departing within the next 72 hours.

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

The best pricing can be found in the month of January. Prices to London Heathrow Airport from Seattle average $860. You can even find prices in January for less than $860, as users have found deals to London Heathrow Airport from as low as $462. The month of June appears to be one of the more expensive times to travel to London Heathrow Airport from Seattle. Flying in the targeted month can save you up to 32%.

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

When flying from Seattle to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 20% versus a flight in the morning.

Cheap Icelandair flights from Seattle to Heathrow

Explore cheap flight options specifically provided by Icelandair for the route between Seattle and Heathrow. 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 2,991,349 searches. Data last updated April 27, 2024.
Take a peek at the cheapest Icelandair flights we've detected traveling from Seattle to London. Make sure to check back often as deals are often changing.
Sun 9/226:55 pmSEA - LHR
1 stop33h 00mIcelandair
Mon 10/79:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$592
Wed 10/93:50 pmSEA - LHR
1 stop20h 30mIcelandair
Tue 11/1212:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 4/26$606
Mon 10/73:50 pmSEA - LHR
1 stop20h 30mIcelandair
Mon 10/149:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$607
Sun 10/133:50 pmSEA - LHR
1 stop12h 05mIcelandair
Mon 10/219:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/27$608
Sun 10/203:50 pmSEA - LHR
1 stop20h 30mIcelandair
Mon 10/288:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$609
Wed 9/253:50 pmSEA - LHR
1 stop12h 05mIcelandair
Wed 10/21:05 pmLHR - SEA
1 stop15h 30mIcelandair
Deal found 4/26$611
Tue 9/246:55 pmSEA - LHR
1 stop17h 25mIcelandair
Wed 10/91:05 pmLHR - SEA
1 stop12h 50mIcelandair
Deal found 4/26$612
Mon 9/236:55 pmSEA - LHR
1 stop17h 25mIcelandair
Mon 10/219:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$613
Mon 9/233:50 pmSEA - LHR
1 stop20h 30mIcelandair
Mon 10/219:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/27$614

  • One of the most popular airlines traveling from Seattle to London Heathrow Airport is Icelandair. Seattle to London Heathrow Airport flights are typically 60% cheaper than other airlines traveling the same route. Flights from Icelandair typically cost $985.93 RT. The cheapest Icelandair flight found for this route was $637. The most popular departure airport in Seattle when flying to London Heathrow Airport is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London Heathrow Airport is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, Icelandair flights are 5% more popular than any other airline flying that same route.

Cheap KLM flights from Seattle to Heathrow

Explore cheap flight options specifically provided by KLM for the route between Seattle and Heathrow. 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 2,991,349 searches. Data last updated April 27, 2024.
Some of the best deals we've found on KLM flights traveling from Seattle to London. Make sure to examine the flight information before completing your reservation.
Sun 10/139:10 pmSEA - LHR
Nonstop9h 40mKLM
Wed 10/2311:45 amLHR - SEA
1 stop13h 05mKLM
Deal found 4/26$649
Tue 9/249:15 pmSEA - LHR
Nonstop9h 35mKLM
Wed 10/94:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 4/27$654
Fri 9/209:15 pmSEA - LHR
Nonstop9h 35mKLM
Fri 9/2711:45 amLHR - SEA
1 stop13h 05mKLM
Deal found 4/26$699
Tue 10/19:10 pmSEA - LHR
Nonstop9h 40mKLM
Mon 10/214:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 4/26$703
Thu 5/21:30 pmSEA - LHR
1 stop13h 15mKLM
Fri 5/109:55 amLHR - SEA
1 stop14h 45mKLM
Deal found 4/26$728
Tue 9/109:15 pmSEA - LHR
Nonstop9h 35mKLM
Thu 9/194:50 pmLHR - SEA
Nonstop10h 30mKLM
Deal found 4/27$737
Fri 9/209:15 pmSEA - LHR
Nonstop9h 35mKLM
Sun 10/64:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 4/25$752
Thu 10/39:10 pmSEA - LHR
Nonstop9h 40mKLM
Sun 10/2010:55 amLHR - SEA
1 stop15h 43mKLM
Deal found 4/26$763
Wed 8/219:15 pmSEA - LHR
Nonstop9h 35mKLM
Sat 8/314:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 4/26$771

  • If you’re traveling from Seattle to London Heathrow Airport, one of the more common airlines traveling that route is KLM. Flights from KLM traveling this route typically cost $1,255.15 RT. This price is typically 52% cheaper than other airlines that offer Seattle to London Heathrow Airport flights. When booking this route, the cheapest RT price found was $905. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to London Heathrow Airport. London Heathrow Airport is the most popular arrival airport in London Heathrow Airport. When flying from Seattle to London Heathrow Airport, KLM flights are 5% more popular than any other airline flying that same route.

Cheap Seattle to Heathrow flights in April & May 2024

Find cheap flight options from Seattle to Heathrow specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,991,349 searches. Prices were last updated on April 27, 2024.
Listed are some of the best fares we've found on flights departing from Seattle to London in 2024. More deals are always being added, so be sure to check back regularly.
Tue 4/305:55 amSEA - LHR
1 stop17h 20mVirgin Atlantic
Wed 5/84:50 pmLHR - SEA
Nonstop10h 30mVirgin Atlantic
Deal found 4/26$632
Tue 4/305:55 amSEA - LHR
1 stop17h 20mVirgin Atlantic
Wed 5/811:00 amLHR - SEA
1 stop14h 24mVirgin Atlantic
Deal found 4/26$637
Wed 5/17:35 pmSEA - LHR
Nonstop9h 40mDelta
Wed 5/159:00 amLHR - SEA
1 stop16h 40mDelta
Deal found 4/26$646
Mon 4/2912:35 amSEA - LHR
1 stop22h 40mDelta
Wed 5/86:15 amLHR - SEA
1 stop19h 25mDelta
Deal found 4/26$651
Wed 5/17:35 pmSEA - LHR
Nonstop9h 40mDelta
Wed 5/1512:45 pmLHR - SEA
Nonstop9h 55mDelta
Deal found 4/26$653
Mon 4/2912:35 amSEA - LHR
1 stop22h 40mDelta
Wed 5/812:45 pmLHR - SEA
Nonstop9h 55mDelta
Deal found 4/26$658
Fri 5/34:30 pmSEA - LHR
Nonstop9h 20mDelta
Tue 5/146:15 amLHR - SEA
1 stop19h 25mDelta
Deal found 4/26$696
Thu 5/27:35 pmSEA - LHR
Nonstop9h 40mKLM
Fri 5/109:55 amLHR - SEA
1 stop14h 45mKLM
Deal found 4/26$699
Thu 5/27:35 pmSEA - LHR
Nonstop9h 40mKLM
Fri 5/104:50 pmLHR - SEA
Nonstop10h 30mKLM
Deal found 4/26$703

Seattle to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
Listed are some of the best fares we've found on flights departing from Seattle to London in 2024. More deals are always being added, so be sure to check back regularly.
Sun 9/226:55 pmSEA - LHR
1 stop33h 00mIcelandair
Mon 10/79:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$592
Tue 11/52:35 pmSEA - LHR
1 stop20h 45mIcelandair
Tue 11/1212:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 4/26$605
Wed 10/93:50 pmSEA - LHR
1 stop20h 30mIcelandair
Tue 11/1212:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 4/26$606
Mon 10/73:50 pmSEA - LHR
1 stop20h 30mIcelandair
Mon 10/149:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$607
Mon 11/42:35 pmSEA - LHR
1 stop12h 20mIcelandair
Tue 11/128:25 pmLHR - SEA
1 stop28h 35mIcelandair
Deal found 4/27$608
Sun 10/203:50 pmSEA - LHR
1 stop20h 30mIcelandair
Mon 10/288:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$609
Wed 9/253:50 pmSEA - LHR
1 stop12h 05mIcelandair
Wed 10/21:05 pmLHR - SEA
1 stop15h 30mIcelandair
Deal found 4/26$611
Tue 9/246:55 pmSEA - LHR
1 stop17h 25mIcelandair
Wed 10/91:05 pmLHR - SEA
1 stop12h 50mIcelandair
Deal found 4/26$612
Mon 9/236:55 pmSEA - LHR
1 stop17h 25mIcelandair
Mon 10/219:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 4/26$613

Non-stop flights to Heathrow from Seattle

Discover non-stop flight options from Seattle to Heathrow. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
To help reduce your travel time, choose from one of these non-stop flights from Seattle to London. Search for alternative flights from Seattle to London by utilizing the search form above.
Wed 9/254:30 pmSEA - LHR
Nonstop9h 20mVirgin Atlantic
Wed 10/212:45 pmLHR - SEA
Nonstop9h 55mVirgin Atlantic
Deal found 4/26$652
Tue 10/19:10 pmSEA - LHR
Nonstop9h 40mKLM
Wed 10/304:35 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 4/26$653
Tue 9/249:15 pmSEA - LHR
Nonstop9h 35mKLM
Wed 10/94:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 4/27$654
Wed 9/187:40 pmSEA - LHR
Nonstop9h 20mBritish Airways
Wed 9/259:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 4/27$696
Sun 9/221:40 pmSEA - LHR
Nonstop9h 20mBritish Airways
Sat 10/59:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 4/25$702
Sat 10/51:50 pmSEA - LHR
Nonstop9h 20mBritish Airways
Fri 10/189:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 4/26$703
Mon 9/239:15 pmSEA - LHR
Nonstop9h 35mKLM
Mon 10/74:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 4/27$704
Fri 10/41:30 pmSEA - LHR
Nonstop9h 20mBritish Airways
Wed 10/239:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 4/26$712
Tue 8/209:15 pmSEA - LHR
Nonstop9h 35mDelta
Tue 8/2712:45 pmLHR - SEA
Nonstop9h 55mDelta
Deal found 4/26$721

Seattle to Heathrow flights leaving soon

Find last-minute flight options from Seattle to Heathrow 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 2,991,349 searches. Data last updated April 27, 2024.
Have a look at some of the flights available from Seattle to London departing last-minute. It's wise to confirm all flight details are correct before booking.
Fri 5/34:30 pmSEA - LHR
Nonstop9h 20mDelta
Tue 5/146:15 amLHR - SEA
1 stop19h 25mDelta
Deal found 4/26$696
Thu 5/27:35 pmSEA - LHR
Nonstop9h 40mKLM
Fri 5/109:55 amLHR - SEA
1 stop14h 45mKLM
Deal found 4/26$699
Thu 5/27:35 pmSEA - LHR
Nonstop9h 40mKLM
Fri 5/104:50 pmLHR - SEA
Nonstop10h 30mKLM
Deal found 4/26$703
Thu 5/21:30 pmSEA - LHR
1 stop13h 15mKLM
Fri 5/109:55 amLHR - SEA
1 stop14h 45mKLM
Deal found 4/26$728
Sat 5/41:30 pmSEA - LHR
2 stops18h 30mMultiple Airlines
Mon 5/66:40 amLHR - SEA
2 stops23h 44mMultiple Airlines
Deal found 4/25$756
Sun 5/53:50 pmSEA - LHR
1 stop20h 30mIcelandair
Wed 5/159:25 pmLHR - SEA
1 stop28h 15mIcelandair
Deal found 4/26$765
Tue 5/73:50 pmSEA - LHR
1 stop12h 05mIcelandair
Wed 5/151:05 pmLHR - SEA
1 stop12h 35mIcelandair
Deal found 4/27$785
Tue 5/73:50 pmSEA - LHR
1 stop12h 05mIcelandair
Tue 5/149:25 pmLHR - SEA
1 stop28h 15mIcelandair
Deal found 4/26$786
Fri 5/33:50 pmSEA - LHR
1 stop20h 30mIcelandair
Sun 5/199:25 pmLHR - SEA
1 stop28h 15mIcelandair
Deal found 4/26$794

One-way flights to Heathrow from Seattle

Search for one-way flight options from Seattle to Heathrow. 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 2,991,349 searches. Data last updated April 27, 2024.
Some of the best available deals we've found on one-way flights from Seattle to London. Those seeking round-trip flights from Seattle to London should utilize the search form at the the top of the page.
Tue 10/83:50 pmSEA - LHR
1 stop20h 30mIcelandair
Deal found 4/26$242
Wed 9/253:50 pmSEA - LHR
1 stop20h 30mIcelandair
Deal found 4/26$261
Tue 10/13:50 pmSEA - LHR
1 stop12h 05mIcelandair
Deal found 4/26$294
Sat 10/123:50 pmSEA - LHR
1 stop12h 05mIcelandair
Deal found 4/26$300
Thu 9/196:55 pmSEA - LHR
1 stop33h 00mIcelandair
Deal found 4/26$308
Tue 7/231:50 pmSEA - LHR
2 stops21h 55mMultiple Airlines
Deal found 4/25$332
Mon 5/277:00 amSEA - LHR
2 stops31h 40mMultiple Airlines
Deal found 4/26$336
Mon 5/277:00 amSEA - LHR
2 stops31h 40mMultiple Airlines
Deal found 4/27$337
Fri 8/910:50 pmSEA - LHR
2 stops37h 30mMultiple Airlines
Deal found 4/26$341

Find flights from Seattle to Heathrow within your budget

Customize your flight search to find flights from Seattle to Heathrow 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 2,991,349 searches. Data last updated April 27, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$592 - $653

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 9/22

1 stop33h 00m

London Heathrow

Mon 10/7

1 stop28h 30m

$592

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/1

1 stop14h 50m

London Heathrow

Thu 10/24

2 stops17h 46m

$637

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/8

1 stop14h 50m

London Heathrow

Wed 10/16

2 stops19h 30m

$639

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/1

2 stops17h 10m

London Heathrow

Fri 10/25

1 stop15h 59m

$640

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/1

1 stop30h 27m

London Heathrow

Fri 10/25

1 stop30h 20m

$646

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 10/13

Nonstop9h 40m

London Heathrow

Wed 10/23

1 stop13h 05m

$649

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/1

1 stop13h 15m

London Heathrow

Thu 10/24

1 stop14h 20m

$651

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/25

Nonstop9h 20m

London Heathrow

Wed 10/2

Nonstop9h 55m

$652

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/1

Nonstop9h 20m

London Heathrow

Wed 10/23

Nonstop9h 45m

$653

Flights are sorted by cheapest first

Deals found on 4/26

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Heathrow. Price data was last updated on January 28, 2024.
Booking 62 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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When is the cheapest time to fly from Seattle to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Heathrow. Price data was last updated on April 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to London Heathrow Airport flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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Average price of flights to Heathrow by month

Plan your trip from Seattle to Heathrow by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Heathrow is currently $306 while a round-trip flight costs $640. Price data was last updated on April 21, 2024.

Currently, November is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of $653). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of $1,173). 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

$675

February

$664

March

$715

April

$700

May

$748

June

$1,173

July

$987

August

$779

September

$748

October

$712

November

$653

December

$672

Temperature and rainfall in Heathrow by month

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

LON

Temperature

39.2 - 62.6 °F

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated April 27, 2024.
Peruse reviews from past customers who have flown with Icelandair, KLM and SWISS from Seattle to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,951 reviews
Check prices

Food

7.4

Boarding

8.2

Overall

8.1

Entertainment

8.0

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Delta
8.1
Very good
10,951 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Food

7.4

Boarding

8.2

Overall

8.1

Entertainment

8.0

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

KLM
7.9
Good
1,623 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Food

7.4

Boarding

8.2

Overall

8.1

Entertainment

8.0

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

SWISS
7.8
Good
2,056 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Food

7.4

Boarding

8.2

Overall

8.1

Entertainment

8.0

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Finnair
7.8
Good
1,382 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Food

7.4

Boarding

8.2

Overall

8.1

Entertainment

8.0

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Virgin Atlantic
7.7
Good
746 reviews
Delta
8.1
Very good
10,951 reviews
Check prices

Food

7.4

Boarding

8.2

Overall

8.1

Entertainment

8.0

Comfort

7.9

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

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?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to London Heathrow. You should not have trouble finding flights to London Heathrow from Seattle/Tacoma Intl; the airport handles an average of 19 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 16 airlines have flights from the Seattle airport to London Heathrow. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

  • Can I find flights from Seattle to London Heathrow Airport for under $600 on Cheapflights?

    Yes, there are multiple flights from Seattle to London Heathrow Airport for under $600. The cheapest flight booked recently is on Icelandair for just $592, but on average you can expect to pay $620.

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

    Cheapflights has at least 20 direct flights from Seattle to London Heathrow Airport under $700. A good price for a nonstop flight from Seattle to London Heathrow Airport is less than $718.

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

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

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

    Our cheapest airline available from Seattle to London Heathrow Airport is Icelandair. Our recent data shows that you can find tickets from as low as $592 on this airline. Additional options worth looking into are Air Canada and Lufthansa, starting at $637 and $640 round-trip. Icelandair is currently priced 33% below the average price you’ll pay for this route.

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

    Before booking your flight from Seattle to London Heathrow Airport check out the most popular airlines for this route: American Airlines, Air Canada or Air France.

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

    No one likes to see their flight delayed. When booking a flight from Seattle to London Heathrow Airport consider choosing Air France (78%), Delta (78%) or KLM (78%) as they are the most reliable in getting you off to your destination on time.

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

    Looking for the cheapest flight from Seattle to London Heathrow Airport? While on average our users pay $1,497, our data indicates the cheapest price to be $474. The most popular route (Seattle/Tacoma Intl - London Heathrow), is priced around $605.

  • What does SEA to LHR mean?

    SEA stands for Seattle/Tacoma Intl Airport, while LHR stands for London Heathrow Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.

  • Can I find deals for flights from Seattle to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Heathrow flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Heathrow flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by 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 vacation 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.

  • Can I find deals for flights from Seattle to Heathrow that allow pets onboard?

    Many airlines flying from Seattle to Heathrow offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Heathrow?

    Yes, you can often find last-minute deals on Seattle to Heathrow flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to London Heathrow Airport flight deals updated?

    The Seattle to London Heathrow Airport flight deals you see on this page were last updated on 4/27.

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Alternative routes for Seattle to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.

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Top 10 airlines flying from Seattle to Heathrow

Discover the top 10 airlines that operate flights from Seattle to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$402Average$697FlexibilityNo cancel feeOn-time76%
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IcelandairCheapest$519Average$706FlexibilityNo cancel feeOn-time76%
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Aer LingusCheapest$526Average$845FlexibilityNo cancel feeOn-timeN/A
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FinnairCheapest$572Average$943FlexibilityNo cancel feeOn-time76%
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United AirlinesCheapest$575Average$890FlexibilityNo cancel feeOn-time69%
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IberiaCheapest$583Average$867FlexibilityNo cancel feeOn-time77%
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Air FranceCheapest$586Average$878FlexibilityNo cancel feeOn-time77%
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Air CanadaCheapest$604Average$902FlexibilityNo cancel feeOn-time67%
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American AirlinesCheapest$606Average$992FlexibilityNo cancel feeOn-time71%
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British AirwaysCheapest$632Average$970FlexibilityNo cancel feeOn-time70%
Search British Airways flights
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Search flights from Seattle to Heathrow by cabin class

Find flights from Seattle to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Seattle to Heathrow

Find hourly flight availability from Seattle to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 27, 2024.
0%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
40%of flight departuresAfternoonNoon to 6 pm
60%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to Heathrow

Explore weekly flight availability from Seattle to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 27, 2024.
Sunday20daily flights
Monday20daily flights
Tuesday15daily flights
Wednesday20daily flights
Thursday20daily flights
Friday20daily flights
Saturday20daily flights

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

Cheapflights makes it easy to find Seattle to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Heathrow flexibly with Cheapflights today.

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Of course! You can now track prices for flights from Seattle to Heathrow and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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