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Find Cheap Flights from London Heathrow to Seattle/Tacoma Intl (LHR - SEA)

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London Heathrow to Seattle/Tacoma Intl Flight Information

Avg. Flight Duration 9h 35m
Flights Arrive in Seattle/Tacoma Intl
Flights Depart from London Heathrow
Flight Price $346
Distance 4,786 miles
Airlines Lufthansa, Brussels Airlines, British Airways, Virgin Atlantic

Good to Know

Low Season:
February
Best time to beat the crowds
3%
expected price decrease
High Season:
July
Most popular time to fly
13%
expected price increase
Average Price:
$479
(avg. price over the last 2 weeks)
Good Deal:
$375
or less (round trip)

When to Book Flights from London Heathrow to Seattle/Tacoma Intl

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top Tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $374 or less.
The cheapest flight from London Heathrow to Seattle/Tacoma Intl was found 84 days before departure, on average.
Book at least 7 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is February.
Morning departure is around 28% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking London Heathrow to Seattle/Tacoma Intl Flights

How long does a flight from London Heathrow to Seattle/Tacoma Intl take?
An average nonstop flight takes 9h 50m, covering a distance of 4786 miles.
How many flights are there between London Heathrow and Seattle/Tacoma Intl?
There are 149 (nonstop) flights between London Heathrow and Seattle/Tacoma Intl per week, averaging 20 per day.
Which airlines provide the cheapest flights from London Heathrow to Seattle/Tacoma Intl?
In the past 3 days, the cheapest round-trip tickets were found on Multiple Airlines ($346), Lufthansa ($357) and Brussels Airlines ($357).
Do I need a passport to fly between London Heathrow and Seattle/Tacoma Intl?
Yes.
Which airlines fly most frequently between London Heathrow and Seattle/Tacoma Intl?
American Airlines (2 times daily), Aer Lingus (2 times daily), Finnair (2 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly London Heathrow to Seattle/Tacoma Intl?
For London Heathrow to Seattle/Tacoma Intl, Tuesday is the cheapest day to fly on average and Wednesday is the most expensive. Flying from Seattle/Tacoma Intl back to London Heathrow, the best deals are generally found on Monday, with Sunday being the most expensive.

Book cheap flights from London Heathrow to Seattle/Tacoma Intl (round-trip)

Airports
Origin
London
$346
only
$346
Destination
Seattle
$346
only
$346
Tue, Feb 5
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
16h 00m
Tue, Feb 12
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
12h 20m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Jan 31
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
16h 00m
Thu, Feb 7
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
12h 20m
Trip: 8 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 23,022 reviews
Overall
8.1
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.7
Food
7.7
SEA
FRA
Excellent 10.0

Food excellent. Cabin crew friendly and professional. Also very attentive.

Cabin got warm at the end of flight. And because I am usually cold, I can only imagine how warm others felt

FRA
MXP
Mediocre 2.6

Same as above same as a bove

Same as above

NAP
FRA
Excellent 10.0

The crew was very accommodating, Frequently offered water also.

Can t think of anything.

ATL
FRA
Okay 4.0

Crew was very nice and attent ive

Delay cause sings uS to miSs oUr fliGh? ENT.ert.ainmrt wasn't good eitHer and way to cramped even for coach on that long of a fligh

CDG
FRA
Excellent 8.6

Crew, boarding, seat

Paris airport is extremely passenger unfriendly. Better to connect somewhere else

Thu, Mar 14
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
21h 28m
Thu, Mar 21
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
15h 15m
Trip: 8 days
6.9GoodShow reviews
Overall 6.9 Good
Based on 1,865 reviews
Overall
7.1
Boarding
7.1
Comfort
7.0
Crew
7.6
Entertainment
6.4
Food
6.4
BRU
TLV
Okay 4.8

25 min late too much announcements during night flight, especially about duty free items and prices...

BRU
VCE
Mediocre 3.0

1) They left our luggage at Brussels, the lost and found desk in Venice that handles Brussels airlines was unmanned. Took 40 minutes to talk to a person. 2) Although promised to bring the luggage on the next day, only brought 2 days after! We had to buy some cloth and still waiting for response from them. 3) We almost missed the connection flight (we had almost hour and a half) because the line for connection flight security was enormous and only 1 person worked in the security. Not only that we were rushed by the crew to RUN (!!!) for the bus, that was ridiculous ! We could fall and hurt ourselves.

JFK
BRU
Mediocre 2.0

Nothing

Terrible. Long delays caused me to miss connecting flight and a wedding. Lufthansa decided 12 hours of my day and the missed ceremony was worth a 5 euro voucher... Never flying german again.

IAD
BRU
Excellent 8.6

On our longer flight, we were thrilled- nice crew, delicious food, spacious, great pilot, and enjoyable entertainment experience. However, on our shorter flight from Brussels to telaviv, not only was the crew completely inattentive, but they were intentive to some very disturbing things including children who were pulling the hair of other customers and jumping up-and-down in the aisles of the airplane. There was no available entertainment whatsoever. In addition the food was extremely expensive and not particularly tasty. The plane was uncomfortable and smelled atrocious. These 2 vastly different experiences almost made me feel like I was taking 2 different airlines. Please keep consistency.

I didn't like the inconsistency of the 2 different planes that I was on. If you are going to have entertainment you should have some form of it on all of your airplanes. The idea that food that you need to buy is so expensive is absurd. I was really blown away by how badly the plane smelled. It was almost as if I was in a bathroom. And on top of that I really felt very unsafe with children jumping up-and-down kicking people pulling their hair etc. While it isn't the job of the flight attendants to be parents, they certainly need to be aware of safety concerns for the rest of the passengers.

JFK
BRU
Good 6.6

Attentive helpful and cheerful staff: on time

Food

Tue, Oct 16
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
24h 17m
Tue, Nov 6
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
14h 37m
Trip: 22 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 196 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.8
LHR
SEA
Excellent 9.0

Food and entertainment

LHR
SEA
Okay 4.0

If you want to reserve your airline seat (I'm talking a standard economy seat) you have to pay $34 per seat if it's 24 hours or more before your flight. Guess what happens at 24 hours? The airport takes over and you're stuck in the middle of a crowded 10.5 hour flight all because you weren't able to select your seat ahead of time. Just another money grab from a tanking airline.

LHR
SEA
Excellent 8.6

The crew and the plan and the service were all top notch. However, their new policy as of 1/1/2018 in which they even charge for coffee and water seems very misplaced and excessive.

Their new policy as of 1/1/2018 in which they even charge for coffee and water on short flights (Madrid to London in this case) seems excessive, even in this day of ala carte flying. :-(

LHR
SEA
Excellent 8.0

There was a good selection of very different movies to watch. I found four that I wanted to see.

There were not enough chairs in the waiting area. There was a long wait, first, just to get on the plane, then, instead of letting us stay in the waiting area, we were all seated, and left waiting for at least an hour, most of that time without explanation, sitting in a stifling plane at the gate, without being allowed to get up and move around. Also, the ratio of carbohydrates to protein in the main meal was way out of kilter. I don't want rice + potatoes + bread + crackers all in one meal, with zero vegetables. The tiny piece of cheese helped.

LHR
SEA
Excellent 8.3

The cabin crew were excellent. The food service was very good. Entertainment choices were abundant and generally good.

Reaching our connecting flight. The Bataan death march comes to mind—concourse 3 to 5, oh my! Having got through all the hurdles including incomprehensible up, down, up again down again escalator rides and security pat down for my wife we got to Concourse 5 where we learned our plane was leaving from C gates, but not which C gate. So we looked for directions to C gates. The only signage was for C gates 52 to 57. Common sense would lead one to believe that C gates 1 to 51 existed somewhere in the terminal; but no they do not and not many people are aware that they don’t. There has to be a better way. Perhaps before Brexit becomes a reality you could lean on Germany’s vaunted efficiency to help clean up this nightmare scenario.

Wed, Dec 19
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
9h 50m
Mon, Dec 31
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
9h 20m
Trip: 13 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 22 reviews
Overall
8.0
Boarding
8.2
Comfort
7.7
Crew
8.4
Entertainment
7.9
Food
7.7
JFK
LHR
Excellent 10.0

The flight felt so short, service was amazing, food was good. Great overall experience.

LHR
SEA
Excellent 9.6

The crew was very friendly and helpful. Ample amounts of snacks/meals provided and I was very grateful that the airline isn't stingy about serving food nowadays.

LHR
SEA
Good 6.3

Great movie selection

They need softer seats...had to stand half the time

LHR
SEA
Excellent 9.6

Made the long flight bearable to have good food, drinks, and entertainment provided.

LHR
SEA
Good 7.6

Special Food availability

No Delta in flight or suty free shopping magazines for reading

Fri, Nov 23
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
16h 00m
Tue, Nov 27
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
12h 20m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Mar 20
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
18h 50m
Thu, Mar 28
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
14h 20m
Trip: 9 days
6.9GoodShow reviews
Overall 6.9 Good
Based on 1,865 reviews
Overall
7.1
Boarding
7.1
Comfort
7.0
Crew
7.6
Entertainment
6.4
Food
6.4
TLV
BRU
Good 7.0

Choice of food was very limited as they were missing the food in catalog.

BRU
TLV
Okay 4.8

25 min late too much announcements during night flight, especially about duty free items and prices...

JTR
BRU
Mediocre 3.3

At least it was a flight

Noisy, no complimentary snacks nor drinks, no legroom

JFK
BRU
Mediocre 2.0

Nothing

Terrible. Long delays caused me to miss connecting flight and a wedding. Lufthansa decided 12 hours of my day and the missed ceremony was worth a 5 euro voucher... Never flying german again.

BRU
TLV
Mediocre 3.0

On our longer flight, we were thrilled- nice crew, delicious food, spacious, great pilot, and enjoyable entertainment experience. However, on our shorter flight from Brussels to telaviv, not only was the crew completely inattentive, but they were intentive to some very disturbing things including children who were pulling the hair of other customers and jumping up-and-down in the aisles of the airplane. There was no available entertainment whatsoever. In addition the food was extremely expensive and not particularly tasty. The plane was uncomfortable and smelled atrocious. These 2 vastly different experiences almost made me feel like I was taking 2 different airlines. Please keep consistency.

I didn't like the inconsistency of the 2 different planes that I was on. If you are going to have entertainment you should have some form of it on all of your airplanes. The idea that food that you need to buy is so expensive is absurd. I was really blown away by how badly the plane smelled. It was almost as if I was in a bathroom. And on top of that I really felt very unsafe with children jumping up-and-down kicking people pulling their hair etc. While it isn't the job of the flight attendants to be parents, they certainly need to be aware of safety concerns for the rest of the passengers.

Thu, Nov 15
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
16h 07m
Tue, Dec 4
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
14h 45m
Trip: 20 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 196 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.8
LHR
SEA
Excellent 8.0

There was a good selection of very different movies to watch. I found four that I wanted to see.

There were not enough chairs in the waiting area. There was a long wait, first, just to get on the plane, then, instead of letting us stay in the waiting area, we were all seated, and left waiting for at least an hour, most of that time without explanation, sitting in a stifling plane at the gate, without being allowed to get up and move around. Also, the ratio of carbohydrates to protein in the main meal was way out of kilter. I don't want rice + potatoes + bread + crackers all in one meal, with zero vegetables. The tiny piece of cheese helped.

LHR
SEA
Excellent 8.6

The crew and the plan and the service were all top notch. However, their new policy as of 1/1/2018 in which they even charge for coffee and water seems very misplaced and excessive.

Their new policy as of 1/1/2018 in which they even charge for coffee and water on short flights (Madrid to London in this case) seems excessive, even in this day of ala carte flying. :-(

LHR
SEA
Okay 4.0

If you want to reserve your airline seat (I'm talking a standard economy seat) you have to pay $34 per seat if it's 24 hours or more before your flight. Guess what happens at 24 hours? The airport takes over and you're stuck in the middle of a crowded 10.5 hour flight all because you weren't able to select your seat ahead of time. Just another money grab from a tanking airline.

LHR
SEA
Good 6.0

Flight crew was top notch with few exceptions. Safe journey. Great price tag with what should have been limited connections.

BA used to be one of my three favorite airlines, especially the international. Sat on tarmac for over 2 hours because no one thought to load luggage of a couple hundred people or de-ice the wings for the sprinkle of snowflakes that terrified London. Cancelled our first flight to London a few hours before we were to leave home and after two hours on the phone, we were instructed to cancel our remaining flights and purchase a connecting flight to our destination ON OUR OWN DIME with the hope BA May reimburse. Had to fly into another COUNTRY, pay for our own hotel room and transfers and got to our final destination a day later, with only crossed fingers BA will take care of some of those expenses or at very least reimburse for the cancelled flight. They Lost our luggage on the way home because of a 2-hour delay (tarmac story above^), because they involved 3 airlines in their efforts to help us connect back home. Staff and crew we saw face to face were great to help...though not all customers shared that experience as we witnessed. Administratively, based on our 2 weeks of multi-country travel with them, BA seems to have lost the ability to manage themselves. 2.5 hour flight from Rome to London has terrible service and we had to ask for water to drink. Everything else was paid...I’m accustomed to that on regionals Euro commuter flights but very surprising on a full-fledged BA plane covering that distance. So many extra inches given to the thirty folks in first and business that commoners get sardine seats across the pond to America. That being said, the seats themselves are plenty comfortable withthe exception of arm rests that do not fully position upright. BA used to make you feel incredibly fortunate to fly with them. Now, I appreciate the crew who worked very hard to make-up for such an ugly delay on the ground and in baggage and flightbmanagement. The rest left me with a migraine.

LHR
SEA
Excellent 8.3

The cabin crew were excellent. The food service was very good. Entertainment choices were abundant and generally good.

Reaching our connecting flight. The Bataan death march comes to mind—concourse 3 to 5, oh my! Having got through all the hurdles including incomprehensible up, down, up again down again escalator rides and security pat down for my wife we got to Concourse 5 where we learned our plane was leaving from C gates, but not which C gate. So we looked for directions to C gates. The only signage was for C gates 52 to 57. Common sense would lead one to believe that C gates 1 to 51 existed somewhere in the terminal; but no they do not and not many people are aware that they don’t. There has to be a better way. Perhaps before Brexit becomes a reality you could lean on Germany’s vaunted efficiency to help clean up this nightmare scenario.

Thu, Oct 25
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
13h 25m
Sun, Oct 28
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
17h 14m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Dec 1
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
19h 10m
Sun, Dec 2
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
12h 20m
Trip: 2 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Sep 28
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
14h 06m
Mon, Oct 1
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
14h 45m
Trip: 4 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 22 reviews
Overall
8.0
Boarding
8.2
Comfort
7.7
Crew
8.4
Entertainment
7.9
Food
7.7
JFK
LHR
Excellent 10.0

The flight felt so short, service was amazing, food was good. Great overall experience.

LHR
SEA
Excellent 9.3

We were inmiddle seats -not our preference. We were told in Dublin that we had different seats to the ones we ended up in. Food was excellent, crew were very nice. Loved the "make a wish" event on this flight - a definite plus for Virgin.

LHR
SEA
Good 6.3

Great movie selection

They need softer seats...had to stand half the time

LHR
SEA
Excellent 9.6

Made the long flight bearable to have good food, drinks, and entertainment provided.

LHR
SEA
Excellent 9.0

Food and snacks!!!!!

Wed, Sep 26
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
33h 38m
Sun, Sep 30
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
33h 55m
Trip: 5 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 22 reviews
Overall
8.0
Boarding
8.2
Comfort
7.7
Crew
8.4
Entertainment
7.9
Food
7.7
MEL
HKG
Excellent 8.3

We paid for ecomony x which gave us priority check in and boarding plus first meal. Very impressed, we had an exit row seat and the flight attendant who sat opposite us was extremely friendly.

I wish the economy x seats weren’t located next to the toilets... it’s pretty bothersome with the noise, smells and light emitted

LHR
SEA
Excellent 8.3

Complimentary newspaper Food service

Overhead reading light

LHR
SEA
Excellent 9.6

Made the long flight bearable to have good food, drinks, and entertainment provided.

LHR
SEA
Good 7.6

Special Food availability

No Delta in flight or suty free shopping magazines for reading

LHR
SEA
Excellent 9.6

The crew was very friendly and helpful. Ample amounts of snacks/meals provided and I was very grateful that the airline isn't stingy about serving food nowadays.

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