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

Search hundreds of travel sites at once for deals on flights to London Heathrow

Wed 2/21
Wed 2/28
Any month
Compare vs. KAYAK |

Good to Know

Low Season:
April
Best time to beat the crowds
4%
expected price decrease
High Season:
June
Most popular time to fly
24%
expected price increase
Average Price:
$1909
(avg. price over the last 2 weeks)
Good Deal:
$1490
or less (round trip)

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

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

Top tips for Finding a Cheap Flight

The cheapest flight from Seattle/Tacoma Intl to London Heathrow was found 83 days before departure, on average.
Book at least 3 weeks before departure in order to get a below-average price.
High season is considered to be May, June and July. The cheapest month to fly is April.
Morning departure is around 23% cheaper 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 Seattle/Tacoma Intl to London Heathrow Flights

How long does a flight from Seattle/Tacoma Intl to London Heathrow take?
An average nonstop flight takes 9h 20m, covering a distance of 4786 miles.
How many flights are there between Seattle/Tacoma Intl and London Heathrow?
There are 242 (nonstop) flights between Seattle/Tacoma Intl and London Heathrow per week, averaging 32 per day.
Which airlines provide the cheapest flights from Seattle/Tacoma Intl to London Heathrow?
In the past 3 days, the cheapest round-trip tickets were found on Icelandair ($525), Finnair ($666) and KLM ($666).
Do I need a passport to fly between Seattle/Tacoma Intl and London Heathrow?
Yes.
Which airlines fly most frequently between Seattle/Tacoma Intl and London Heathrow?
American Airlines (4 times daily), Aer Lingus (4 times daily), Finnair (4 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Seattle/Tacoma Intl to London Heathrow?
For Seattle/Tacoma Intl to London Heathrow, Wednesday is the cheapest day to fly on average and Monday is the most expensive. Flying from London Heathrow back to Seattle/Tacoma Intl, the best deals are generally found on Tuesday, with Sunday being the most expensive.

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

Airports
Origin
Seattle
$525
only
$525
Destination
London
$525
only
$525
Wed, May 9
SEA
LHR
21h 05m
Sat, May 12
LHR
SEA
13h 30m
Trip: 4 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6710 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
ORY
KEF
Okay 4.0

They were helpful and let me check my boulder pad as sports equipment for free on the flight to paris.

CDG
KEF
Excellent 9.3

Food options

DEN
KEF
Excellent 8.0

Surprised by very large bag fees, reservation was unclear about baggage allowance and charges.

KEF
BOS
Excellent 8.6

Crew was friendly, like the bigger plane and direct flight.

Luggage fees!!!

KEF
EWR
Mediocre 2.8

My entertainment system stopped working 1/2 way through the flight and there was very little leg room that caused back pain

Sun, Apr 22
SEA
LHR
9h 20m
Fri, May 4
LHR
SEA
9h 55m
Trip: 13 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 9 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
SEA
LHR
Okay 5.6

No leg room

HEL
TXL
Okay 5.6

my luggage was misplaced and I didnt have it for 3 days.

HEL
NRT
Excellent 9.3

I really enjoyed the whole flight - Finnair is definitely one of the best airlines.

I wish there was a bigger choice of classical music in the entertainment program.

SEA
LHR
Excellent 10.0

Movies Food Comfortable seating

Going through security

SVO
HEL
Good 6.5

The flight did eventually take off, unlike a few others leaving around the same time.

We were delayed several hours and were never told why. Mostly there were no Aeroflot staff at the gate to ask. When there was, they said they couldn't help us because our flight was a codeshare with FinnAir. At the last minute they switched gates, sending us all scurrying.

Mon, Apr 30
SEA
LHR
15h 15m
Thu, Jun 14
LHR
SEA
12h 56m
Trip: 46 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1746 reviews
Overall
8.0
Boarding
8.0
Comfort
7.7
Crew
8.5
Entertainment
7.1
Food
7.4
IAD
AMS
Good 7.3

787 is a great airplane. The 3-3-3 seat configuration leaves enough seat width to be just comfortable in coach.

LAX
AMS
Mediocre 2.0

My bagage broke

I paid extra fee for extra bagage which was tv and i paid insurance my tv broke and no one responces for it

AMS
TPE
Excellent 9.3

Service impeccable!

They have one line of executive class after the kitchen and toilet, is very noisy.

AMS
MAN
Good 7.0

The flight attendants could not do enough for you.

Business class was pretty empty but again I was not allowed to change my seat selection online. Pathetic check-in.

PTY
AMS
Good 6.3

KLM crews look unhappy with their work. Everything they do is a favor not duty.

Tue, Jun 5
SEA
LHR
14h 30m
Wed, Jun 13
LHR
SEA
23h 45m
Trip: 9 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Aug 20
SEA
LHR
9h 25m
Thu, Sep 20
LHR
SEA
9h 40m
Trip: 32 days
8.2ExcellentShow reviews
Overall 8.2 Excellent
Based on 8 reviews
Overall
8.1
Boarding
8.2
Comfort
7.7
Crew
8.5
Entertainment
8.0
Food
7.7
LAX
BNE
Good 7.0

I never expect airline food to be any good but I’m always hoping it’s edible. This was not the case, as the egg breakfast made me physically ill.

BNE
LAX
Excellent 10.0

I loved how the airline crew were very accommodating. This was an awesome experience. A+++

I have no complaints.

MEL
AKL
Okay 4.6

Flight was an hour and a half late boarding, sat on the tarmac for 45 minutes, and there was no offer of complimentary beverages. Very barebones level of service.

BNE
LAX
Good 7.6

For oversea traveling, food could and should be better. For our flight from AKL to BNE, we had to pay for our soft drink!!!

SEA
LHR
Excellent 8.0

Smooth flight

My economy window seat was just too cramped for a big guy on a nine hour flight

Mon, Mar 26
SEA
LHR
13h 00m
Mon, Apr 9
LHR
SEA
40h 14m
Trip: 15 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 21506 reviews
Overall
7.2
Boarding
7.3
Comfort
7.0
Crew
7.7
Entertainment
6.9
Food
6.5
YYJ
YYZ
Okay 4.0

The flight wasn’t full, so I sat in my own row,?which offered spare leg room (I’m 6’2”). Time to fix the leg room issue on Rouge flights — it’s 2018.

Crew seemed uninterested in general. On phones in back while people struggling to find luggage space. Coffee cups and plastic utensils, etc, stored in overhead bins so people at the back had to search for carry-on space elsewhere, again, without assistance from on board crew. Offered service only once and many were sleeping so didn’t get anything. The overall check-in process could be easier, as the app doesn’t always work as it should.

LHR
YYZ
Excellent 8.3

The food was ok. Movie selection was decent and the screens are a lot better than on jet airways.

Boarding was a little delayed. Service was a little slow, but the crew was courteous and did their best.

YYZ
BOS
Excellent 9.0

The flight from Toronto to Boston is extremely short, about an hour. I don’t feel as though I can rate the food since I didn’t buy any, it just doesn’t give me an option to not rate it. It was a completely full flight. It was as comfortable as can be. It’s a smaller plane so you feel everything but the captains were good flyers.

I’m not sure if this is something I can really complain about but I wish the flight attendants would’ve spoken a bit lower. For a plane where half of the people there had missed their connecting flight and were put on a 6:30 am flight, I don’t think we wanted to hear about their detailed personal lives.

YYZ
BOS
Okay 4.0

That we eventually got a flight home.

Being stuck in Boston and Ottawa for 2 extra days and adding around $1200 on to our trip in hotels alone (I was travelling with 4 kids on a school trip and my wife). Additionally, we didn’t find out the flights were cancelled until we arrived at the airport. Apparently, they had been cancelled 2 hours before but there was no notification. Air Canada offered no help whatsoever and the guy at the “service” desk in Boston literally said there was nothing he could do to help. Not even find a new flight. Spent 90 minutes on the phone trying to re-book, plus re-booking hotel along the way.

YYZ
FLL
Excellent 9.3

The crew at the airport and on the plane were excellent. We were on a family holiday with young ones and the crew really took care of our needs. They were extremely courteous and attentive.

The inflight entertainment options could be more current. We found the options limited... it was a good thing that the flight was short.

Thu, Apr 5
SEA
LHR
18h 35m
Fri, Apr 13
LHR
SEA
17h 51m
Trip: 9 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 54708 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
MEM
EWR
Excellent 10.0

On time & courteous. & On board service was excellent

Nothing

GVA
IAD
Excellent 8.0

plane was relatively quiet and comfortable.

Nothing wrong with boarding a plane using a bus, but there are better technologies and they are better.

IAH
PTY
Okay 5.0

The crew was super attentive and cordial.

United Airlines has really deteriorated. Paid entertainment for an international flight is really nickle-and-diming it, especially since it was direct tv which is only available over the continental US!

PUJ
ORD
Good 7.6

We left Chicago close to 6 hours late and they didn't bother to put anyones luggage onboard. So we arrive close to 6 hours late and no luggage so we have to wait in line to fill out paperwork to have our luggage located/delivered along with everybody else who had checked baggage. That can not be a cost effective way to run your business

EWR
PVG
Okay 5.0

The staff was courteous and efficient. The entertainment selections were diverse. The seating was adequate for a long haul flight.

The check-in process took 50 minutes at the counter as the staff told me that I needed a visa for China (transit) while that info was incorrect. I had to deal with online customer service while the person at the counter couldn’t help. It finally took 3 people at the counter to send me away. Once on the plane for a 14+ hour flight, I couldn’t use the bathrooms freely as they were filthy. The staff obviously didn’t maintain the bathrooms during the entire flight. The food served made me wish that I had bought take-out food for 3-meals prior to my boarding. the quantity of food was inadequate for the long flight as well. 1 extra snack would have been appreciated. I will likely book my future trans-Pacific flights with another airline.

Mon, Jun 4
SEA
LHR
15h 00m
Sun, Jun 10
LHR
SEA
14h 45m
Trip: 7 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 4246 reviews
Overall
7.6
Boarding
7.7
Comfort
7.3
Crew
8.0
Entertainment
7.0
Food
6.9
YYZ
DUB
Excellent 8.3

I flew overnight from Toronto, Canada to Dublin and had a relatively pleasant experience. The food and drink trolleys came by quite quickly and frequently, and the food exceeded my expectations. The crew was friendly, for the most part. Boarding certainly could've been smoother... But overall, I'd fly Aer Lingus again for an overseas trip.

DUB
YYZ
Okay 4.0

Having had bad experiences with Aer Lingus before, I was hesitant to book with Aer Lingus again. But sadly, I was booking this flight last minute and had no other option. The route was Dublin to Calgary, via Toronto. I left myself plenty of time im Toronto to clear customs as I know it can take a while. The day of, the flight ended up being 1.5 hours longer than usual due to headwinds, leaving me with only 2.5 hours in Toronto. I ended up waiting 2 hours and 15 minutes for my bag and missing my connecting flight (my sister who was also on the same flight received hers in 30 mins and made the flight). Westjet was wonderful and put me on a later flight but Aer Lingus didn't have any assistance for me.

Aer Lingus lost my sister's luggage going to Ireland and never contacted my sister once the luggage was found. She only received it the day we flew back to Calgary. Poor customer service when inquiring about the bag, no compensation for necessities purchased.

DUB
LHR
Excellent 8.0

Could not check in on-line from Dublin on either Air canada or Aer Linguis websites. Time to sort out this long-standing problem

DUB
YYZ
Excellent 10.0

They really did a great job, kept us informed about what was going on,staff was quick, organized and pleasant. I have to say, best food on a flight that I have had in a very LONG time,!

DUB
BOS
Good 7.0

Pleasant crew and good food/snack service almost forgotten as I stood at the baggage carousel for 40 minutes.

Baggage claim very frustrating (40 minutes) particularly after 12 hours of airports and airplanes. Messed up our ground transportation plans for no apparent reason. Totally unexplained!

Mon, Feb 26
SEA
LHR
9h 25m
Mon, Mar 5
LHR
SEA
15h 48m
Trip: 8 days
10.0ExcellentShow reviews
Overall 10.0 Excellent
Based on 1 reviews
Overall
7.4
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
7.1
Food
6.7
MAD
TFN
Mediocre 3.0

Horrible flight; no complimentary soft drinks are served, not even better. The baggage did not arrive and Iberia does not even deliver the baggage, even though the fault was theirs. You have to go to the airport to recover the baggage. I would NOT RECOMMEND this airline to anyone. The plane was quite old and there are no screens on the seats. One of my worst experiences flying in the last 40 years.

ORD
MAD
Good 7.6

The business class seat was extremely comfortable.

The touch-screen was very difficult to navigate. It didn't respond very well when touched.

MAD
ORD
Good 7.6

Extremely comfortable and was served lots of delicious food

My touch screen froze at the beginning and I couldn't use it at all for the entire flight. Then I tried to use the headphones, but they crackled so loud in my ear and didn't work either.

OAK
BCN
Excellent 8.0

Good organization and time on flight.

In 10 hours never offered water.

MAD
AGP
Excellent 8.0

Our seats was almost the last seat of all our flights, even we checked in very early.

Tue, Mar 20
SEA
LHR
17h 15m
Fri, Mar 30
LHR
SEA
17h 48m
Trip: 11 days
7.7GoodShow reviews
Overall 7.7 Good
Based on 121 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
SEA
LHR
Okay 4.3

3 hours on the plain waiting for take off. Cheap sandwich for breakfast.

SEA
LHR
Okay 5.0

Luggage did not make it to Paris pit on next flight which in turn was also delayed.

SEA
LHR
Okay 5.6

Crew on flight friendly and helpful.

Could never find anyone and at check in counter and gates. For this reason will never fly British Airways if possible.

SEA
LHR
Excellent 10.0

Flight crew was professional and kind! Food and drinks were free on the airbus. Roomy enough to sleep and got pillow, blanket, and free entertainment!

SEA
LHR
Excellent 10.0

Let’s face it, B.A has proper service with friendly crew members, offered up grade to premium economy which I normally take and was more than happy to pay for.

Wed, May 9
SEA
LHR
21h 05m
Tue, May 15
LHR
SEA
29h 25m
Trip: 7 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6710 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
BRU
KEF
Excellent 10.0

My exit aisle seat was just great, with no one on either side of me !!!!! Very kind airplane staff. I had a great sleep.

nothing

CDG
KEF
Excellent 9.3

Food options

KEF
SEA
Okay 4.0

Flight attendants were attractive

On the way back sat on plane waiting for 2 hours due to mechanical issues, then 30-94th more hours eating as flight got cancelled. They charged me for bring my boulder pad back.

ORY
KEF
Okay 4.0

They were helpful and let me check my boulder pad as sports equipment for free on the flight to paris.

KEF
EWR
Mediocre 2.8

My entertainment system stopped working 1/2 way through the flight and there was very little leg room that caused back pain

Tue, Jun 5
SEA
LHR
9h 25m
Thu, Jun 21
LHR
SEA
9h 40m
Trip: 17 days
8.2ExcellentShow reviews
Overall 8.2 Excellent
Based on 8 reviews
Overall
8.1
Boarding
8.2
Comfort
7.7
Crew
8.5
Entertainment
8.0
Food
7.7
BNE
LAX
Excellent 10.0

I loved how the airline crew were very accommodating. This was an awesome experience. A+++

I have no complaints.

BNE
LAX
Good 7.6

For oversea traveling, food could and should be better. For our flight from AKL to BNE, we had to pay for our soft drink!!!

SEA
LHR
Excellent 8.0

Smooth flight

My economy window seat was just too cramped for a big guy on a nine hour flight

LAX
BNE
Good 7.0

I never expect airline food to be any good but I’m always hoping it’s edible. This was not the case, as the egg breakfast made me physically ill.

LAS
LGW
Excellent 10.0

Excellent

Sat, Jul 21
SEA
LHR
30h 45m
Wed, Aug 22
LHR
SEA
35h 44m
Trip: 33 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 9 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
JFK
HEL
Excellent 8.3

it was just okay. nothing spectacular.

my luggage was misplaced and I didnt have it for 3 days.

SEA
LHR
Okay 5.6

No leg room

HEL
TXL
Okay 5.6

my luggage was misplaced and I didnt have it for 3 days.

LED
HEL
Excellent 9.2

I liked that there was a smaller airplane on LED - HEL route: it gives more "feeling of flying" than the bigger planes do.

I didn't like the fact that it was not indicated in advance (when the tickets are sold) that LED - HEL route is operated by a different airline, even though that airline is a Finnair's partner. It would have been better to have a complete information up front. But the airplane and crew were excellent.

SEA
LHR
Mediocre 2.0

Experienced very rude cabin crew

Sun, Apr 15
SEA
LHR
11h 45m
Wed, Apr 18
LHR
SEA
28h 35m
Trip: 4 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6710 reviews
Overall
7.6
Boarding
7.3
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.3
DEN
KEF
Excellent 8.0

Surprised by very large bag fees, reservation was unclear about baggage allowance and charges.

ORD
KEF
Good 7.3

Friendly staff Good entertainment options USB at every seat

Food options very expensive

KEF
EWR
Mediocre 2.8

My entertainment system stopped working 1/2 way through the flight and there was very little leg room that caused back pain

ORY
KEF
Okay 4.0

They were helpful and let me check my boulder pad as sports equipment for free on the flight to paris.

DEN
KEF
Okay 5.6

Entertainment...

Had a tray full of trash most of the way.. don’t they sell trash bags in Iceland?

Sun, Aug 26
SEA
LHR
9h 25m
Wed, Sep 12
LHR
SEA
9h 40m
Trip: 18 days
8.2ExcellentShow reviews
Overall 8.2 Excellent
Based on 8 reviews
Overall
8.1
Boarding
8.2
Comfort
7.7
Crew
8.5
Entertainment
8.0
Food
7.7
LAS
LGW
Excellent 10.0

Excellent

BNE
LAX
Good 7.6

For oversea traveling, food could and should be better. For our flight from AKL to BNE, we had to pay for our soft drink!!!

BNE
LAX
Excellent 10.0

I loved how the airline crew were very accommodating. This was an awesome experience. A+++

I have no complaints.

SEA
LHR
Excellent 8.6

Reasonably comfortable for a long jet ride. Helpful and considerate flight attendants.

The strange windows that kept it looking like night out until 30 minutes before we landed. I prefer the natural light to help readjust my time zones.

MEL
AKL
Good 6.3

Great crew, easy boarding, comfortable enough flight

Could have used a charger for electronics, especially because we were expected to use our own device for entertainment. Didn't order food, but didn't look digestible

Tue, Feb 27
SEA
LHR
25h 06m
Tue, Mar 13
LHR
SEA
34h 14m
Trip: 14 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Feb 26
SEA
LHR
9h 25m
Fri, Mar 9
LHR
SEA
9h 55m
Trip: 12 days
10.0ExcellentShow reviews
Overall 10.0 Excellent
Based on 1 reviews
Overall
7.4
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
7.1
Food
6.7
GRU
MAD
Good 7.3

Few movies. Not good food options

MAD
ORD
Good 7.6

Extremely comfortable and was served lots of delicious food

My touch screen froze at the beginning and I couldn't use it at all for the entire flight. Then I tried to use the headphones, but they crackled so loud in my ear and didn't work either.

ORD
MAD
Good 7.6

The business class seat was extremely comfortable.

The touch-screen was very difficult to navigate. It didn't respond very well when touched.

BCN
OAK
Excellent 9.0

Very friendly

Food

MAD
AGP
Excellent 8.0

Our seats was almost the last seat of all our flights, even we checked in very early.

Wed, Mar 7
SEA
LHR
9h 30m
Wed, Mar 14
LHR
SEA
9h 40m
Trip: 7 days
8.2ExcellentShow reviews
Overall 8.2 Excellent
Based on 8 reviews
Overall
8.1
Boarding
8.2
Comfort
7.7
Crew
8.5
Entertainment
8.0
Food
7.7
LAX
MEL
Excellent 10.0

Talk about an awesome experience. I loved the friendly staff and the accommodations were superb. I could ask for no better. Even the food was excellent.

I have nothing but praise.

BNE
LAX
Excellent 10.0

I loved how the airline crew were very accommodating. This was an awesome experience. A+++

I have no complaints.

MEL
AKL
Good 6.3

Great crew, easy boarding, comfortable enough flight

Could have used a charger for electronics, especially because we were expected to use our own device for entertainment. Didn't order food, but didn't look digestible

BNE
LAX
Good 7.6

For oversea traveling, food could and should be better. For our flight from AKL to BNE, we had to pay for our soft drink!!!

SEA
LHR
Excellent 8.6

Reasonably comfortable for a long jet ride. Helpful and considerate flight attendants.

The strange windows that kept it looking like night out until 30 minutes before we landed. I prefer the natural light to help readjust my time zones.

Mon, Jul 23
SEA
LHR
13h 25m
Mon, Aug 13
LHR
SEA
13h 35m
Trip: 22 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 4246 reviews
Overall
7.6
Boarding
7.7
Comfort
7.3
Crew
8.0
Entertainment
7.0
Food
6.9
BOS
DUB
Okay 5.3

AER LINGUS complimentary water not offered . seats small padding marginal.food offerings compared to other air lines LOW QUALITY

DUB
YYZ
Excellent 10.0

They really did a great job, kept us informed about what was going on,staff was quick, organized and pleasant. I have to say, best food on a flight that I have had in a very LONG time,!

DUB
BOS
Good 7.0

Pleasant crew and good food/snack service almost forgotten as I stood at the baggage carousel for 40 minutes.

Baggage claim very frustrating (40 minutes) particularly after 12 hours of airports and airplanes. Messed up our ground transportation plans for no apparent reason. Totally unexplained!

BOS
DUB
Excellent 9.6

Girl sitting beside me!

Guy sitting behind me!

DUB
LHR
Excellent 8.0

Could not check in on-line from Dublin on either Air canada or Aer Linguis websites. Time to sort out this long-standing problem

Wed, Jun 27
SEA
LHR
17h 25m
Thu, Jul 12
LHR
SEA
31h 38m
Trip: 16 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 54708 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
MEM
EWR
Excellent 10.0

On time & courteous. & On board service was excellent

Nothing

GVA
IAD
Excellent 8.0

plane was relatively quiet and comfortable.

Nothing wrong with boarding a plane using a bus, but there are better technologies and they are better.

SAT
IAD
Okay 4.0

Crew was nice.

Thay threw our checked bags around like trash and we had precious items in the bags. We thought they would fit in thebo erhead bins. They were small - bins were smaller.

PUJ
ORD
Good 7.6

We left Chicago close to 6 hours late and they didn't bother to put anyones luggage onboard. So we arrive close to 6 hours late and no luggage so we have to wait in line to fill out paperwork to have our luggage located/delivered along with everybody else who had checked baggage. That can not be a cost effective way to run your business

AMS
EWR
Excellent 10.0

I like that it was through United Airline, which I’m a member of so I got to board a littler earlier

The food could have been better. Everything had cheese which I don’t eat.

Show more results

Seattle/Tacoma Intl to London Heathrow Flight Information

Avg. Flight Duration 9h 35m
Flights Arrive in London Heathrow
Flights Depart from Seattle/Tacoma Intl
Flight Price $525
Distance 4786 miles
Airlines Icelandair, Finnair, KLM, Virgin Atlantic, Air Canada, United, Aer Lingus, Iberia, British Airways
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

^
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.