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Cheap flights from Seattle (SEA) to Heathrow (LHR) from $394

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 8/10. 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. 21 — may. 281
From?
To?
mar. 5/21
mar. 5/28
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in January or February, booked 75 days in advance, depart on a Wednesday or Tuesday 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 mayo 16, 2024.

Popular in

June

Cheapest in

January

Round-trip from

$643

One-way from

$411
High demand for flights, 28% potential price rise
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Best time to find cheap flights, 20% 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 13% 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 55% on this flight, we recommend booking at least 8 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 $646 1-2 weeks out and tickets from $1,159 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 November. Prices to London Heathrow Airport from Seattle average $860. You can even find prices in November for less than $860, as users have found deals to London Heathrow Airport from as low as $560. 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 39%.

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 23% versus a flight in the morning.

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 2,637,452 searches. Data last updated mayo 16, 2024.
Take a peek at the cheapest KLM flights we've detected traveling from Seattle to London. Make sure to check back often as deals are often changing.
mar. 8/139:15 pmSEA - LHR
Nonstop9h 35mKLM
mié. 8/284:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 5/15$717
mar. 8/139:15 pmSEA - LHR
Nonstop9h 35mKLM
mar. 8/2710:55 amLHR - SEA
1 stop15h 35mKLM
Deal found 5/16$728
mar. 8/69:15 pmSEA - LHR
Nonstop9h 35mKLM
sáb. 8/314:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 5/16$743
mar. 5/219:10 pmSEA - LHR
Nonstop9h 40mKLM
mar. 5/284:50 pmLHR - SEA
Nonstop10h 30mKLM
Deal found 5/14$770
mar. 5/219:10 pmSEA - LHR
Nonstop9h 40mKLM
mar. 6/114:50 pmLHR - SEA
Nonstop10h 20mKLM
Deal found 5/16$771
mar. 8/131:35 pmSEA - LHR
1 stop12h 25mKLM
vie. 8/234:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 5/16$775
mar. 8/139:15 pmSEA - LHR
Nonstop9h 35mKLM
vie. 8/234:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 5/15$795
mié. 8/149:15 pmSEA - LHR
Nonstop9h 35mKLM
jue. 9/194:50 pmLHR - SEA
Nonstop10h 30mKLM
Deal found 5/15$810
dom. 8/119:15 pmSEA - LHR
Nonstop9h 35mKLM
dom. 8/2511:45 amLHR - SEA
1 stop12h 50mKLM
Deal found 5/16$816

  • 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 $982.93 RT. This price is typically 73% cheaper than other airlines that offer Seattle to London Heathrow Airport flights. When booking this route, the cheapest RT price found was $637. 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 Air Canada flights from Seattle to Heathrow

Explore cheap flight options specifically provided by Air Canada 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 2,637,452 searches. Data last updated mayo 16, 2024.
Some of the best deals we've found on Air Canada flights traveling from Seattle to London. Make sure to examine the flight information before completing your reservation.
mié. 8/711:40 amSEA - LHR
1 stop12h 55mAir Canada
jue. 9/192:10 pmLHR - SEA
1 stop12h 16mAir Canada
Deal found 5/15$720
dom. 8/1110:40 amSEA - LHR
2 stops17h 10mAir Canada
sáb. 8/319:30 amLHR - SEA
1 stop19h 55mAir Canada
Deal found 5/15$748
mar. 5/2110:40 amSEA - LHR
2 stops17h 10mAir Canada
vie. 5/312:05 pmLHR - SEA
1 stop15h 11mAir Canada
Deal found 5/16$801
vie. 8/97:40 amSEA - LHR
1 stop14h 50mAir Canada
mié. 8/218:40 amLHR - SEA
2 stops17h 46mAir Canada
Deal found 5/15$804
mar. 5/215:50 amSEA - LHR
2 stops19h 45mAir Canada
mar. 5/2812:05 pmLHR - SEA
1 stop17h 53mAir Canada
Deal found 5/16$806
mar. 5/217:40 amSEA - LHR
1 stop14h 50mAir Canada
dom. 5/269:30 amLHR - SEA
2 stops16h 57mAir Canada
Deal found 5/16$920
mar. 5/217:40 amSEA - LHR
2 stops17h 55mAir Canada
dom. 5/269:30 amLHR - SEA
2 stops16h 57mAir Canada
Deal found 5/16$926

  • Air Canada is one of the most popular airlines used for those traveling from Seattle to London Heathrow Airport. Flights on this route from Air Canada typically cost $1,262.70 RT, a price that is 57% cheaper than the average Seattle to London Heathrow Airport flight. The cheapest flight found was $1,016 RT. 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, Air Canada flights are 5% more popular than any other airline flying that same route.

Cheap Seattle to Heathrow flights in May & June 2024

Find cheap flight options from Seattle to Heathrow specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on mayo 16, 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.
lun. 6/246:05 amSEA - LHR
1 stop17h 10mVirgin Atlantic
vie. 8/3012:45 pmLHR - SEA
Nonstop9h 55mVirgin Atlantic
Deal found 5/16$673
mar. 6/1810:40 amSEA - LHR
2 stops15h 20mMultiple Airlines
mar. 9/1010:50 amLHR - SEA
2 stops19h 30mMultiple Airlines
Deal found 5/15$679
lun. 6/241:30 pmSEA - LHR
Nonstop9h 20mBritish Airways
vie. 8/309:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 5/15$680
lun. 6/241:30 pmSEA - LHR
Nonstop9h 20mBritish Airways
vie. 8/309:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 5/16$683
lun. 6/1710:40 amSEA - LHR
2 stops17h 10mMultiple Airlines
mié. 9/1110:50 amLHR - SEA
2 stops19h 30mMultiple Airlines
Deal found 5/15$685
lun. 6/179:10 pmSEA - LHR
Nonstop9h 40mDelta
mar. 9/1011:30 amLHR - SEA
1 stop14h 20mDelta
Deal found 5/15$686
dom. 6/1612:40 amSEA - LHR
1 stop22h 35mDelta
mar. 9/106:15 amLHR - SEA
1 stop19h 35mDelta
Deal found 5/16$690
lun. 6/243:10 pmSEA - LHR
2 stops31h 20mLufthansa
vie. 8/309:30 amLHR - SEA
2 stops35h 00mLufthansa
Deal found 5/15$692
lun. 6/245:53 amSEA - LHR
1 stop17h 47mAmerican Airlines
vie. 8/3012:15 pmLHR - SEA
1 stop16h 26mAmerican Airlines
Deal found 5/16$694

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 2,637,452 searches. Data last updated mayo 16, 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.
mar. 10/83:50 pmSEA - LHR
1 stop12h 05mIcelandair
mar. 10/221:05 pmLHR - SEA
1 stop12h 50mIcelandair
Deal found 5/16$581
mar. 10/83:10 pmSEA - LHR
1 stop14h 10mLufthansa
jue. 10/242:10 pmLHR - SEA
1 stop12h 16mLufthansa
Deal found 5/16$582
mié. 10/93:10 pmSEA - LHR
1 stop14h 10mLufthansa
mié. 10/232:10 pmLHR - SEA
1 stop30h 20mLufthansa
Deal found 5/16$583
dom. 11/242:35 pmSEA - LHR
1 stop12h 20mIcelandair
mié. 12/48:25 pmLHR - SEA
1 stop28h 35mIcelandair
Deal found 5/15$584
dom. 9/293:50 pmSEA - LHR
1 stop12h 05mIcelandair
mié. 10/91:05 pmLHR - SEA
1 stop12h 50mIcelandair
Deal found 5/16$585
mié. 10/93:50 pmSEA - LHR
1 stop20h 30mIcelandair
lun. 10/149:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 5/15$586
dom. 10/66:55 pmSEA - LHR
1 stop17h 25mIcelandair
lun. 10/149:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 5/14$588
mar. 9/246:55 pmSEA - LHR
1 stop17h 25mIcelandair
mar. 10/89:25 pmLHR - SEA
1 stop28h 30mIcelandair
Deal found 5/16$591
lun. 12/26:05 pmSEA - LHR
Nonstop9h 35mVirgin Atlantic
mar. 12/1011:35 amLHR - SEA
Nonstop9h 55mVirgin Atlantic
Deal found 5/15$592

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 2,637,452 searches. Data last updated mayo 16, 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.
mar. 8/139:15 pmSEA - LHR
Nonstop9h 35mKLM
mié. 8/284:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 5/15$717
mar. 8/69:15 pmSEA - LHR
Nonstop9h 35mKLM
sáb. 8/314:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 5/15$742
mar. 8/69:15 pmSEA - LHR
Nonstop9h 35mKLM
sáb. 8/314:50 pmLHR - SEA
Nonstop10h 25mKLM
Deal found 5/16$743
dom. 8/117:40 pmSEA - LHR
Nonstop9h 20mBritish Airways
mié. 8/289:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 5/15$745
dom. 8/117:40 pmSEA - LHR
Nonstop9h 20mBritish Airways
vie. 9/209:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 5/15$759
mar. 8/139:15 pmSEA - LHR
Nonstop9h 35mDelta
lun. 9/2312:45 pmLHR - SEA
Nonstop9h 55mDelta
Deal found 5/15$767
dom. 6/29:10 pmSEA - LHR
Nonstop9h 40mKLM
mié. 6/194:50 pmLHR - SEA
Nonstop10h 20mKLM
Deal found 5/15$770
mar. 5/214:30 pmSEA - LHR
Nonstop9h 20mDelta
mié. 5/2912:45 pmLHR - SEA
Nonstop9h 55mDelta
Deal found 5/16$771
dom. 5/194:30 pmSEA - LHR
Nonstop9h 20mVirgin Atlantic
mar. 6/44:50 pmLHR - SEA
Nonstop10h 20mVirgin Atlantic
Deal found 5/15$772

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 2,637,452 searches. Data last updated mayo 16, 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.
mar. 5/217:40 amSEA - LHR
1 stop18h 20mMultiple Airlines
mar. 6/1110:50 amLHR - SEA
2 stops19h 27mMultiple Airlines
Deal found 5/16$757
mar. 5/2112:50 pmSEA - LHR
1 stop12h 50mUnited Airlines
mar. 6/410:50 amLHR - SEA
1 stop14h 09mUnited Airlines
Deal found 5/16$762
mar. 5/214:30 pmSEA - LHR
Nonstop9h 20mDelta
mar. 5/289:00 amLHR - SEA
1 stop16h 40mDelta
Deal found 5/14$763
mar. 5/214:30 pmSEA - LHR
Nonstop9h 20mDelta
jue. 6/1311:30 amLHR - SEA
1 stop14h 05mDelta
Deal found 5/16$764
mar. 5/217:40 amSEA - LHR
1 stop14h 50mMultiple Airlines
vie. 6/79:30 amLHR - SEA
2 stops16h 57mMultiple Airlines
Deal found 5/16$765
mar. 5/214:30 pmSEA - LHR
Nonstop9h 20mDelta
mié. 5/299:55 amLHR - SEA
1 stop14h 45mDelta
Deal found 5/16$766
mar. 5/217:10 amSEA - LHR
1 stop15h 35mDelta
mar. 6/119:00 amLHR - SEA
1 stop16h 35mDelta
Deal found 5/16$768
mar. 5/211:30 pmSEA - LHR
1 stop12h 30mDelta
mar. 5/286:15 amLHR - SEA
1 stop13h 05mDelta
Deal found 5/16$769
mar. 5/219:10 pmSEA - LHR
Nonstop9h 40mKLM
mar. 5/284:50 pmLHR - SEA
Nonstop10h 30mKLM
Deal found 5/14$770

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 2,637,452 searches. Data last updated mayo 16, 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.
sáb. 8/1011:00 pmSEA - LHR
1 stop13h 20mIcelandair
Deal found 5/15$394
mar. 7/97:00 amSEA - LHR
2 stops46h 25mMultiple Airlines
Deal found 5/15$405
dom. 7/146:55 pmSEA - LHR
2 stops14h 25mMultiple Airlines
Deal found 5/15$410
vie. 7/126:55 pmSEA - LHR
1 stop33h 00mIcelandair
Deal found 5/15$411
lun. 6/247:40 amSEA - LHR
1 stop14h 50mAir Canada
Deal found 5/15$413
vie. 8/91:50 pmSEA - LHR
2 stops21h 55mMultiple Airlines
Deal found 5/16$418
sáb. 6/111:10 pmSEA - LHR
1 stop23h 25mAir Canada
Deal found 5/14$419
mié. 6/197:00 amSEA - LHR
1 stop21h 05mWestJet
Deal found 5/15$420
lun. 7/1511:59 pmSEA - LHR
3 stops27h 56mMultiple Airlines
Deal found 5/15$422

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 2,637,452 searches. Data last updated mayo 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$717 - $750

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

mar. 8/13

Nonstop9h 35m

London Heathrow

mié. 8/28

Nonstop10h 25m

$717

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

mié. 8/7

1 stop12h 55m

London Heathrow

jue. 9/19

1 stop12h 16m

$720

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

lun. 8/5

1 stop17h 25m

London Heathrow

mié. 9/18

1 stop12h 50m

$725

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

jue. 8/8

2 stops16h 40m

London Heathrow

mié. 9/18

2 stops17h 46m

$726

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

jue. 8/8

1 stop12h 10m

London Heathrow

jue. 8/22

1 stop17h 21m

$731

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

jue. 8/8

Nonstop9h 35m

London Heathrow

jue. 9/19

1 stop13h 05m

$736

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

dom. 8/11

Nonstop9h 35m

London Heathrow

dom. 9/22

Nonstop9h 55m

$742

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

dom. 8/11

Nonstop9h 20m

London Heathrow

vie. 8/30

Nonstop9h 45m

$745

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

dom. 8/11

1 stop15h 05m

London Heathrow

dom. 9/22

Nonstop9h 45m

$750

Flights are sorted by cheapest first

Deals found on 5/15

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 May 10, 2024.
Booking 75 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 May 12, 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 Sunday at noon 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 $412 while a round-trip flight costs $732. Price data was last updated on May 12, 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 $1,150). 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

$673

February

$662

March

$715

April

$692

May

$733

June

$1,150

July

$976

August

$775

September

$745

October

$708

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 mayo 16, 2024.
Peruse reviews from past customers who have flown with KLM, Air Canada and Icelandair 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
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.0
Very good
10,673 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

KLM
7.9
Good
1,568 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

SWISS
7.8
Good
1,994 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Finnair
7.8
Good
1,376 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Virgin Atlantic
7.7
Good
735 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

7.9

Food

7.4

Entertainment

8.0

Boarding

8.2

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

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 $800 on Cheapflights?

    Yes, there are multiple flights from Seattle to London Heathrow Airport for under $800. The cheapest flight booked recently is on KLM for just $717, but on average you can expect to pay $736.

  • Are there nonstop flights from Seattle to London Heathrow Airport for under $800 on Cheapflights?

    Cheapflights has at least 20 direct flights from Seattle to London Heathrow Airport under $800. A good price for a nonstop flight from Seattle to London Heathrow Airport is less than $785.

  • Are there last-minute flights available from Seattle to London Heathrow Airport for under $800?

    There are currently 20+ open flights from Seattle to London Heathrow Airport within the next 7 days for less than $800.

  • 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 KLM. Our recent data shows that you can find tickets from as low as $717 on this airline. Additional options worth looking into are Air Canada and Icelandair, starting at $720 and $725 round-trip. KLM is currently priced 18% below the average price you’ll pay for this route.

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

    The cheapest airlines for a one-way flight from Seattle to London Heathrow Airport are Icelandair ($394), Air Canada ($413), and WestJet ($420).

  • 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 American Airlines (71%), Aer Lingus (71%) or Finnair (71%) 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 $3,063, our data indicates the cheapest price to be $487. The most popular route (Seattle/Tacoma Intl - London Heathrow), is priced around $574.

  • 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 5/16.

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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 2,637,452 searches. Data last updated mayo 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$402Average$702FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest$519Average$703FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest$557Average$845FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
FinnairCheapest$572Average$943FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest$575Average$921FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest$582Average$836FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Air FranceCheapest$588Average$877FlexibilityNo cancel feeOn-time77%
Search Air France flights
American AirlinesCheapest$598Average$964FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapest$604Average$902FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest$625Average$955FlexibilityNo 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 mayo 16, 2024.
1%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
52%of flight departuresAfternoonNoon to 6 pm
47%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 mayo 16, 2024.
Sunday20daily flights
Monday20daily flights
Tuesday15daily flights
Wednesday20daily flights
Thursday20daily flights
Friday20daily flights
Saturday20daily flights

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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!

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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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