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

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Seattle/Tacoma Intl to London Heathrow Flight Information

Flights Arrive in London Heathrow
Flights Depart from Seattle/Tacoma Intl
Flight Price C$ 617
Distance 7,702 km
Airlines Lufthansa, Icelandair

Good to Know

Low Season:
October
Best time to beat the crowds
3%
expected price decrease
High Season:
June
Most popular time to fly
15%
expected price increase
Average price:
C$ 947
(price for this month)
Good Deal:
C$ 954
or less round-trip within
3 months
of travel is a good deal

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, on average, 74 days before departure.
Book at least 2 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 October.
Morning departure is around 13% 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 16h 20m, covering a distance of 7702 km.
How many flights are there between Seattle/Tacoma Intl and London Heathrow?
There are 73 (nonstop) flights between Seattle/Tacoma Intl and London Heathrow per week, averaging 10 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 Lufthansa (C$ 617) and Icelandair (C$ 766)
Which airlines fly most frequently between Seattle/Tacoma Intl and London Heathrow?
American Airlines (1 times daily), Aer Lingus (1 times daily), Finnair (1 times daily) are the most frequent flyers on this route.

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

Airports
Origin
Seattle
C$ 617
only
C$ 617
Destination
London
C$ 617
only
C$ 617
Tue, 12 Feb
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
16h 20m
Thu, 21 Feb
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
16h 00m
C$ 617
Trip: 10 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 23,659 reviews
Overall
8.1
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.7
Food
7.7
DFW
FRA
Excellent 9.3

Pros: Service on the DFW-->FRA leg was phenomenal (ratio of attendants to fliers). Food was delicious and seats very comfortable.

Cons: Boarding process and organization could have been a bit better in communicating access and groups. Not super critical, but the goal in in process is to be as efficient as possible.

FRA
EWR
Excellent 8.6

Pros: I liked the part of entertainment, bunch of free movies we could watch

Cons: the Meals. It could have been perfect when there was other options than vegetarian.

FRA
AMM
Excellent 8.0

Pros: Food and service were phenomenal, and the seats were very comfortable.

Cons: Gate agents were joking and laughing during pre-board, and the entire plane attempted to board at once.

MUC
KBP
Good 7.0

Pros: Airbus seats, n/a considering short flight

Cons: Some staff ignored us in our isle

MUC
DEN
Excellent 9.0

Pros: Loved the German touches like real silverware, good wine, and German movies with English subtitles! Also appreciated lots of liquids and never had to go searching for hydration.

Cons: Everything was great until we landed and I stood up in the aisle. A woman two rows behind opened the overhead compartment and pulled her huge backpack out, landing it right on my head! OUCH! I scolded her and she apologized, but, REALLY? Perhaps the crew needs to reiterate how dangerous this is to do! My head still hurts a little on top, almost a week later. Ugh.

Fri, 7 Dec
SEA
Seattle/Tacoma Intl
LHR
London Heathrow
20h 50m
Wed, 12 Dec
LHR
London Heathrow
SEA
Seattle/Tacoma Intl
28h 25m
C$ 766
Trip: 6 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 7,964 reviews
Overall
7.5
Boarding
7.2
Comfort
7.4
Crew
8.1
Entertainment
7.7
Food
6.2
CDG
KEF
Good 6.6

Pros: The crew and the overall space on the plane.

Cons: Paris airport is a mess. Food selection.

KEF
YYZ
Excellent 8.0

Pros: Friendly crew, comfortable seats, good cabin climate, good selection of movies to watch. Although there was a delay in boarding, we did still leave on time.

Cons: Slow, delayed boarding, with bus to the plane and stair walk up.

AMS
KEF
Excellent 8.0

Pros: Friendly crew, comfortable seats, good cabin climate, good selection of movies to watch.

Cons: Late boarding, slow process due to some confusion at the gate for many of the passengers.

KEF
JFK
Okay 4.0

Cons: See above

KEF
HAM
Excellent 10.0

Pros: Smooth ride.

Cons: Absence of a nice meal

*
Prices are per person, are for e–tickets and include all taxes & fees in CAD.

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

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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.