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

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Good to know

Average price:
£929
(avg. price over the last 72 hours)
Good deal:
£659
or less return trip within
4 months
of travel is a good deal

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

Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

The cheapest flight from London Heathrow to Seattle/Tacoma Intl was found, on average, 90 days before departure.
Book at least 4 weeks before departure in order to get a below-average price.
Morning departure is around 16% 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 non-stop flight takes 12h 35m, covering a distance of 4786 miles.
How many flights are there between London Heathrow and Seattle/Tacoma Intl?
There are 170 (non-stop) flights between London Heathrow and Seattle/Tacoma Intl per week, averaging 23 per day.
Which airlines provide the cheapest flights from London Heathrow to Seattle/Tacoma Intl?
In the past 3 days, the cheapest return tickets were found on Icelandair (£352), Multiple Airlines (£427) and Virgin Atlantic (£436).
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 (3 times daily), Aer Lingus (3 times daily), Finnair (3 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly from London Heathrow to Seattle/Tacoma Intl?
For London Heathrow to Seattle/Tacoma Intl, Monday is the cheapest day to fly on average and Friday is the most expensive. Flying from Seattle/Tacoma Intl back to London Heathrow, the best deals are generally found on Friday, with Monday being the most expensive.

Book cheap flights from London Heathrow to Seattle/Tacoma Intl (return)

Airports
Origin
London
£352
only
£352
Destination
Seattle
£352
only
£352
Mon, 15 Jan
LHR
SEA
12h 35m
Thu, 25 Jan
SEA
LHR
20h 20m
£352
Trip: 11 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
KEF
PDX
OK 4.6

Food was as advertised, and entertainment was not at all disappointing.

Seat screwup... IcelandAir screwed up my seat selection and failed in three opportunities to fix it. During online check-in, I swapped my aisle seat for an exit row middle seat with empty standing room in front of me (because I am tall this is important). Skeptical, I verified this twice at Stockholm ARL by checking computer and with the bagge agent. She reassured me I would have long leg room. Upon boarding, I quickly learned I had been misled: I had a middle seat with short leg room and between two passengers. A flight attendant declined to listen or help me even though better seats were available. It turned out to be my worst trans-oceanic flight among 1 to 2 dozen in my life.

ORD
KEF
Good 6.0

The people at the airport itself are some of the most rude people I have encountered in all of my travels. Throwing my tray back at me while I was putting my shoes in it and saying “it’s not done, take it”. She bruised my stomach because I tried to stop it and grab it, and dumped my stuff, including a now broken camera. Very unprofessional and not necessary.

JFK
KEF
Excellent 10.0

Good service and good seats

MCO
KEF
Excellent 10.0

Friendly staff and easy flight from Orlando!! Can’t wait to fly Icelandair again

Outstanding customer service!

DEN
KEF
Excellent 9.0

Comfortable planes, nice crew, great pilots

No food served

Wed, 1 Nov
LHR
SEA
13h 23m
Mon, 13 Nov
SEA
LHR
16h 40m
£427
Trip: 13 days
Overall 0.0 Poor
Based on 0 reviews
Sat, 11 Nov
LHR
SEA
31h 48m
Sun, 12 Nov
SEA
LHR
9h 30m
£436
Trip: 2 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 13 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
APW
SYD
Good 7.3

Helpful flight attendants

Delay at the airport due to system down where agents had to check in everyone manually

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.

SYD
LAX
Excellent 8.0

On time.

.

LHR
SFO
Excellent 10.0

Amazing food and drinks, and to top it off we were served a frozen ice cream treat during our flight.

LHR
SEA
Excellent 9.6

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

Sun, 17 Dec
LHR
SEA
28h 20m
Wed, 27 Dec
SEA
LHR
19h 40m
£478
Trip: 11 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16138 reviews
Overall
8.2
Boarding
8.2
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.7
BUD
MUC
Excellent 10.0

Staff were so friendly! The plane was clean and comfortable.

MUC
BOS
Excellent 8.0

The food and frequency of service and free checked bag were among my favorite parts of the flight. Overall the flight was fantastic. I loved the camera feature that allowed you to look at the outside of the plane. The crew was so friendly and courteous.

The amount of entertainment available was not unappreciated, I enjoyed many of the documentaries although I wish there had been even more nature documentaries, as those are my favorite :) I did hope for a more updated selection of Hollywood movies.

TXL
FRA
Good 7.0

missed connection in frankfurt

ATH
MUC
Excellent 8.0

My flight was a little under two hours and I loved all of the extra leg room in the exit row. The crew was friendly and pleasant.

MUC
IAD
Excellent 10.0

Friendly staff! Clean and comfortable!

We sat in the back of the plane, so when we were served food and drinks, they had run out of items by the time they got to us.

Fri, 9 Feb
LHR
SEA
12h 50m
Wed, 21 Feb
SEA
LHR
19h 40m
£483
Trip: 13 days
7.7GoodShow reviews
Overall 7.7 Good
Based on 1364 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.4
DAR
AMS
Good 6.0

The very dirty plane was cleaned at Dar-es-salaam and became less dirty. The pilot kept us updated periodically through the flight. The flight attendants were very pleasant.

The plane was very dirty when we landed in Dar-es-salaam. The plane did get cleaned a little bit in Dar-es-salaam however I was still missing a pillow and blanket which I had to actively seek out. Seating was not very comfortable as there was a box attached to the leg of the seat in front of me, making it necessary to keep my feet at an uncomfortable angle through the long flight. I did not enjoy the food.

VIE
AMS
Mediocre 2.6

Arriving more or less on time

Crew is awful. Disrespectful desinterested in customers find themselves very important. No service mentality whatsoever. No respectful airline would hire such arrogant self centered personalities in a service role

AMS
JFK
Excellent 10.0

great choice of entertainment content, friendly crew

AMS
CDG
Good 6.6

Timing & efficiency. Good food though only a sandwich.

Nothing. Could say there was no entertainment but I didn't want entertainment on such a short flight

JRO
DAR
Good 6.3

The pilot kept us informed periodically during our journey. I liked that we could choose our seating online. The entertainment was good.

The plane was dirty, all seats did not have pillows and blankets. Seating was not very comfortable, particularly as there was a box attached to one of the legs of the seat in front of me, making it necessary to move my legs to an uncomfortable angle.

Fri, 26 Jan
LHR
SEA
28h 25m
Mon, 29 Jan
SEA
LHR
20h 20m
£352
Trip: 4 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
KEF
OSL
Excellent 8.0

seats were very comfortable. The crew was very friendly.

JFK
KEF
Excellent 10.0

Good service and good seats

CPH
KEF
Excellent 8.4

Ease of ticketing

Not allowed to bring a backpack as carry-on, waited a bit to board the plane. The flight was fine, nothing over the top. What I expected.

KEF
JFK
Good 7.6

The inflight entertainment was really nice and enjoyed the Iceland layover information. Crew were professional and attentive.

Felt like a budget airline, so don't expect any free snacks or the ability to carry on large backpacks that you normally could on other airlines.

PDX
KEF
Excellent 8.0

Efficient travel from PDX to CDG European Union passport check/entry was well staffed and competent Pricing was competitive

Thu, 1 Feb
LHR
SEA
28h 25m
Thu, 8 Feb
SEA
LHR
12h 00m
£352
Trip: 8 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
ORD
KEF
Good 6.0

The people at the airport itself are some of the most rude people I have encountered in all of my travels. Throwing my tray back at me while I was putting my shoes in it and saying “it’s not done, take it”. She bruised my stomach because I tried to stop it and grab it, and dumped my stuff, including a now broken camera. Very unprofessional and not necessary.

KEF
PDX
Excellent 9.6

Descent selection of movies and tv shows helped with the long flight. Flight times are great for reduced layover times in Iceland from PDX to MAN.

CPH
KEF
Excellent 8.4

Ease of ticketing

Not allowed to bring a backpack as carry-on, waited a bit to board the plane. The flight was fine, nothing over the top. What I expected.

JFK
KEF
Excellent 10.0

Good service and good seats

MSP
KEF
Excellent 8.0

I loved how friendly everyone was. I loved the USB port and the entertainment system for each seat.

My seat kept sliding forward from the reclining position which made it difficult to keep sleeping through the overnight flight

Thu, 15 Feb
LHR
SEA
12h 35m
Thu, 22 Feb
SEA
LHR
12h 00m
£352
Trip: 8 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
MCO
KEF
OK 4.3

Free checked bag

Very uncomfortable seats

CPH
KEF
Excellent 8.4

Ease of ticketing

Not allowed to bring a backpack as carry-on, waited a bit to board the plane. The flight was fine, nothing over the top. What I expected.

JFK
KEF
Excellent 10.0

Good service and good seats

KEF
JFK
Good 7.6

The inflight entertainment was really nice and enjoyed the Iceland layover information. Crew were professional and attentive.

Felt like a budget airline, so don't expect any free snacks or the ability to carry on large backpacks that you normally could on other airlines.

MCO
KEF
Excellent 10.0

Friendly staff and easy flight from Orlando!! Can’t wait to fly Icelandair again

Outstanding customer service!

Sun, 29 Oct
LHR
SEA
30h 20m
Thu, 9 Nov
SEA
LHR
12h 30m
£435
Trip: 12 days
Overall 0.0 Poor
Based on 0 reviews
Fri, 10 Nov
LHR
SEA
15h 08m
Sat, 11 Nov
SEA
LHR
32h 20m
£441
Trip: 2 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 13 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
SYD
LAX
Excellent 8.0

On time.

.

LHR
LOS
Excellent 10.0

I had a great experience from start to end of my trip. Most of the staff were pleasant and professional. Food wasn't okay and red wine on flight from Heathrow was delicious.

The red wine on the flight from Lagos was too sharp. That is the regular one served on virgin flight so was glad when I tasted the new one served on the flight from Heathrow, thinking it's been changed!

SFO
LHR
Excellent 8.3

Good entertainment, food and in-flight crew

Because this flight was delayed it was a miracle (involving running til my throat literally bled) that I made my connection. Ground crew could not have been less helpful - even to my friend who they knew was trying to get home to attend a family funeral.

LHR
LAX
Excellent 10.0

Virgin atlantic is the best airline with Dreamliner

Nothing

LHR
SFO
Mediocre 2.0

I was selected for additional screening at the gate. I have no problem with this at all. From the start I told them I am traveling with my fiancee. They tried to hold me back in a separate area after the screening and I once again told them my fiancee was waiting for me. One staff memeber walked with me half way back to get her and then disappeared. By the time I found her and came back, the staff memeber was no where to be found. Now we had lost are spot in the line and had to go to the back of the line. We spoke to 3 different staff people about what was going on and everyone said, oh the guy over there will help you. But no one did. The staff had No idea how to run a security check or handle paople. There was No working wifi! There was no tvs in the seats, only the old style in the aisle. The staff told me the plan was going to retire at the end of the month. The food was more for animals then for humans! We got updates by txt 10 mins before the staff updated the gate on our flight out from SFO. I have traveled all over the world with a lot of airlines and Never had such a poor service, but what is it to expect. It was United after all!

Refund of the whole flight.

Mon, 5 Mar
LHR
SEA
12h 35m
Sun, 11 Mar
SEA
LHR
12h 00m
£352
Trip: 7 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
KEF
OSL
Excellent 8.0

seats were very comfortable. The crew was very friendly.

DEN
KEF
Excellent 9.0

Comfortable planes, nice crew, great pilots

No food served

ORD
KEF
Good 6.0

The people at the airport itself are some of the most rude people I have encountered in all of my travels. Throwing my tray back at me while I was putting my shoes in it and saying “it’s not done, take it”. She bruised my stomach because I tried to stop it and grab it, and dumped my stuff, including a now broken camera. Very unprofessional and not necessary.

JFK
KEF
Excellent 10.0

Good service and good seats

MCO
KEF
OK 4.3

Free checked bag

Very uncomfortable seats

Thu, 9 Nov
LHR
SEA
34h 16m
Sat, 11 Nov
SEA
LHR
35h 59m
£441
Trip: 3 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 13 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
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
Excellent 10.0

1st class, what's not to like?

LHR
SEA
Good 7.6

Special Food availability

No Delta in flight or suty free shopping magazines for reading

APW
SYD
Good 7.3

Helpful flight attendants

Delay at the airport due to system down where agents had to check in everyone manually

LHR
SFO
Mediocre 2.0

I was selected for additional screening at the gate. I have no problem with this at all. From the start I told them I am traveling with my fiancee. They tried to hold me back in a separate area after the screening and I once again told them my fiancee was waiting for me. One staff memeber walked with me half way back to get her and then disappeared. By the time I found her and came back, the staff memeber was no where to be found. Now we had lost are spot in the line and had to go to the back of the line. We spoke to 3 different staff people about what was going on and everyone said, oh the guy over there will help you. But no one did. The staff had No idea how to run a security check or handle paople. There was No working wifi! There was no tvs in the seats, only the old style in the aisle. The staff told me the plan was going to retire at the end of the month. The food was more for animals then for humans! We got updates by txt 10 mins before the staff updated the gate on our flight out from SFO. I have traveled all over the world with a lot of airlines and Never had such a poor service, but what is it to expect. It was United after all!

Refund of the whole flight.

Fri, 3 Nov
LHR
SEA
13h 23m
Mon, 6 Nov
SEA
LHR
16h 40m
£456
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Sat, 10 Mar
LHR
SEA
28h 25m
Sat, 17 Mar
SEA
LHR
12h 00m
£352
Trip: 7 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
CPH
KEF
Excellent 8.4

Ease of ticketing

Not allowed to bring a backpack as carry-on, waited a bit to board the plane. The flight was fine, nothing over the top. What I expected.

MSP
KEF
Excellent 8.0

I loved how friendly everyone was. I loved the USB port and the entertainment system for each seat.

My seat kept sliding forward from the reclining position which made it difficult to keep sleeping through the overnight flight

DEN
KEF
Excellent 9.0

Comfortable planes, nice crew, great pilots

No food served

KEF
JFK
Good 7.6

The inflight entertainment was really nice and enjoyed the Iceland layover information. Crew were professional and attentive.

Felt like a budget airline, so don't expect any free snacks or the ability to carry on large backpacks that you normally could on other airlines.

PDX
KEF
Excellent 8.0

Efficient travel from PDX to CDG European Union passport check/entry was well staffed and competent Pricing was competitive

Fri, 10 Nov
LHR
SEA
35h 22m
Sun, 12 Nov
SEA
LHR
22h 50m
£441
Trip: 3 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 13 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
SYD
LAX
Excellent 8.0

On time.

.

LHR
SEA
Good 7.6

Special Food availability

No Delta in flight or suty free shopping magazines for reading

LHR
SFO
Mediocre 2.0

I was selected for additional screening at the gate. I have no problem with this at all. From the start I told them I am traveling with my fiancee. They tried to hold me back in a separate area after the screening and I once again told them my fiancee was waiting for me. One staff memeber walked with me half way back to get her and then disappeared. By the time I found her and came back, the staff memeber was no where to be found. Now we had lost are spot in the line and had to go to the back of the line. We spoke to 3 different staff people about what was going on and everyone said, oh the guy over there will help you. But no one did. The staff had No idea how to run a security check or handle paople. There was No working wifi! There was no tvs in the seats, only the old style in the aisle. The staff told me the plan was going to retire at the end of the month. The food was more for animals then for humans! We got updates by txt 10 mins before the staff updated the gate on our flight out from SFO. I have traveled all over the world with a lot of airlines and Never had such a poor service, but what is it to expect. It was United after all!

Refund of the whole flight.

LHR
SEA
Excellent 9.6

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

LHR
SEA
Excellent 10.0

1st class, what's not to like?

Wed, 13 Dec
LHR
SEA
12h 58m
Fri, 12 Jan
SEA
LHR
14h 27m
£458
Trip: 31 days
Overall 0.0 Poor
Based on 0 reviews
Sat, 17 Mar
LHR
SEA
12h 35m
Wed, 21 Mar
SEA
LHR
20h 20m
£352
Trip: 5 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
DEN
KEF
Excellent 9.0

Comfortable planes, nice crew, great pilots

No food served

ORD
KEF
Good 6.0

The people at the airport itself are some of the most rude people I have encountered in all of my travels. Throwing my tray back at me while I was putting my shoes in it and saying “it’s not done, take it”. She bruised my stomach because I tried to stop it and grab it, and dumped my stuff, including a now broken camera. Very unprofessional and not necessary.

KEF
OSL
Excellent 8.0

seats were very comfortable. The crew was very friendly.

JFK
KEF
Excellent 10.0

Good service and good seats

KEF
JFK
Good 7.6

The inflight entertainment was really nice and enjoyed the Iceland layover information. Crew were professional and attentive.

Felt like a budget airline, so don't expect any free snacks or the ability to carry on large backpacks that you normally could on other airlines.

Sat, 11 Nov
LHR
SEA
34h 54m
Mon, 13 Nov
SEA
LHR
15h 55m
£441
Trip: 3 days
7.5GoodShow reviews
Overall 7.5 Good
Based on 13 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
LHR
SEA
Excellent 10.0

1st class, what's not to like?

LHR
LAX
Excellent 10.0

Virgin atlantic is the best airline with Dreamliner

Nothing

LHR
SFO
Mediocre 2.0

I was selected for additional screening at the gate. I have no problem with this at all. From the start I told them I am traveling with my fiancee. They tried to hold me back in a separate area after the screening and I once again told them my fiancee was waiting for me. One staff memeber walked with me half way back to get her and then disappeared. By the time I found her and came back, the staff memeber was no where to be found. Now we had lost are spot in the line and had to go to the back of the line. We spoke to 3 different staff people about what was going on and everyone said, oh the guy over there will help you. But no one did. The staff had No idea how to run a security check or handle paople. There was No working wifi! There was no tvs in the seats, only the old style in the aisle. The staff told me the plan was going to retire at the end of the month. The food was more for animals then for humans! We got updates by txt 10 mins before the staff updated the gate on our flight out from SFO. I have traveled all over the world with a lot of airlines and Never had such a poor service, but what is it to expect. It was United after all!

Refund of the whole flight.

SYD
LAX
Excellent 8.0

On time.

.

SFO
LHR
Excellent 8.3

Good entertainment, food and in-flight crew

Because this flight was delayed it was a miracle (involving running til my throat literally bled) that I made my connection. Ground crew could not have been less helpful - even to my friend who they knew was trying to get home to attend a family funeral.

Fri, 9 Feb
LHR
SEA
12h 50m
Sun, 11 Feb
SEA
LHR
17h 34m
£458
Trip: 3 days
Overall 0.0 Poor
Based on 0 reviews
Mon, 29 Jan
LHR
SEA
12h 35m
Mon, 12 Feb
SEA
LHR
12h 00m
£353
Trip: 15 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6062 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
ORD
KEF
Good 6.0

The people at the airport itself are some of the most rude people I have encountered in all of my travels. Throwing my tray back at me while I was putting my shoes in it and saying “it’s not done, take it”. She bruised my stomach because I tried to stop it and grab it, and dumped my stuff, including a now broken camera. Very unprofessional and not necessary.

KEF
OSL
Excellent 8.0

seats were very comfortable. The crew was very friendly.

MCO
KEF
Excellent 10.0

Friendly staff and easy flight from Orlando!! Can’t wait to fly Icelandair again

Outstanding customer service!

KEF
PDX
Excellent 9.6

Descent selection of movies and tv shows helped with the long flight. Flight times are great for reduced layover times in Iceland from PDX to MAN.

PDX
KEF
Excellent 8.0

Efficient travel from PDX to CDG European Union passport check/entry was well staffed and competent Pricing was competitive

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.