Find cheap flights from Seattle/Tacoma Airport to London Heathrow Airport

SEA - LHR

Find cheap flights from Seattle/Tacoma Airport to London Heathrow Airport

One-way
Economy
Seattle (SEA)
London Heathrow
Fri 5/29
Fri 6/5
Any month
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Good to know

Low season

October Best time to beat the crowds with an average 19% drop in price.

High season

June Most popular time to fly with an average 34% increase in price.

Average price of a round-trip

$558 (avg. price over the last 2 weeks)

Good deal for a round-trip

$597 or less

When to book flights from Seattle/Tacoma Intl to London Heathrow

Estimated round-trip price
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 $514 or less.
  • The cheapest flight from Seattle/Tacoma Airport to London Heathrow Airport was found 89 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 October.
  • Morning departure is around 25% 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 Airport to London Heathrow Airport flights

Are flight prices cheaper from Seattle/Tacoma Airport to London Heathrow Airport because of Coronavirus (COVID-19)?

How long does a flight from Seattle/Tacoma Airport to London Heathrow Airport take?

How many flights are there between Seattle/Tacoma Airport and London Heathrow Airport?

Which airlines provide the cheapest flights from Seattle/Tacoma Airport to London Heathrow Airport?

Do I need a passport to fly between Seattle/Tacoma Airport and London Heathrow Airport?

Which airlines fly most frequently between Seattle/Tacoma Airport and London Heathrow Airport?

What’s the cheapest day of the week to fly Seattle/Tacoma Airport to London Heathrow Airport?

How does KAYAK’s flight Price Forecast tool help me choose the right time to buy?

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

Airports
Origin
Seattle
$423
only
$423
Destination
London
$423
only
$423
Tue, Nov 3
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
12h 20m
Tue, Nov 10
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 45m
Trip: 8 days
Based on null reviews
Tue, Sep 22
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Sep 29
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 8 days
Based on null reviews
Mon, Sep 14
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Sep 29
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 16 days
Based on null reviews
Tue, Nov 3
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
12h 20m
Tue, Nov 10
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 45m
Trip: 8 days
Based on null reviews
Mon, Sep 14
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Thu, Sep 24
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 11 days
Based on null reviews
Wed, Sep 16
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
20h 30m
Wed, Sep 23
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 8 days
Based on null reviews
Wed, Sep 23
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
20h 30m
Wed, Sep 30
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 8 days
Based on null reviews
Mon, Sep 21
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
21h 15m
Fri, Oct 9
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 19 days
Based on null reviews
Sun, Sep 20
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Fri, Sep 25
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 6 days
Based on null reviews
Mon, Sep 14
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Sep 29
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 16 days
Based on null reviews
Wed, Sep 16
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Wed, Sep 30
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 15 days
Based on null reviews
Sun, Sep 13
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Wed, Sep 30
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 18 days
Based on null reviews
Tue, Oct 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Wed, Oct 14
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 9 days
Based on null reviews
Tue, Oct 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Wed, Oct 14
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 9 days
Based on null reviews
Tue, Oct 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Wed, Oct 14
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 9 days
Based on null reviews
Tue, Oct 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Wed, Oct 14
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 9 days
Based on null reviews
Tue, Sep 29
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
20h 30m
Tue, Oct 6
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 8 days
Based on null reviews
Tue, Sep 29
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Oct 13
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 15 days
Based on null reviews
Tue, Oct 13
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Oct 20
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 8 days
Based on null reviews
Mon, Sep 14
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Mon, Sep 21
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 8 days
Based on null reviews
Show more results

Book cheap flights from Seattle/Tacoma Airport to London Heathrow Airport (one-way)

Airports
Origin
Seattle
$282
only
$282
Destination
London
$282
only
$282
Fri, Jul 10
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Based on null reviews
Mon, Jul 13
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
40h 20m
Based on null reviews
Sun, Aug 9
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
49h 00m
Based on null reviews
Thu, Jul 2
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
52h 55m
Based on null reviews
Fri, Jul 10
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
43h 50m
Based on null reviews
Mon, Jul 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
20h 10m
Based on null reviews
Sun, Jul 12
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
54h 40m
Based on null reviews
Sat, Aug 1
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
54h 40m
Based on null reviews
Tue, Jul 7
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
23h 11m
Based on null reviews
Mon, Jul 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
52h 55m
Based on null reviews
Mon, Jul 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
23h 16m
Based on null reviews
Tue, Jul 7
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
23h 11m
Based on null reviews
Thu, Jul 9
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
24h 35m
Based on null reviews
Sun, Jul 5
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
36h 25m
Based on null reviews
Thu, Jul 9
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
40h 20m
Based on null reviews
Fri, Jul 10
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
24h 35m
Based on null reviews
Sun, Jun 14
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Based on null reviews
Tue, Jul 14
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
27h 10m
Based on null reviews
Wed, Jul 8
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
24h 35m
Based on null reviews
Fri, Jul 3
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
28h 58m
Based on null reviews
Show more results

Top airlines flying Seattle/Tacoma Intl to London Heathrow

Scores according to KAYAK customer reviews

7.3
Icelandair
Overall score based on 9,379 reviews
7.2
Boarding
7.3
Comfort
8.1
Crew
7.6
Entertainment
6.2
Food
Airline reviews
Read more about Icelandair
*
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.
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