London (LCY) to Seattle (SEA) business class reward flights

SEA → LCY

Lowest seen in the last 5 daysPlus fees$424.69Program

Atmos RewardsAirline

British AirwaysDepartingWed, Nov 4

Last checked 4d agoChecked 17 Oct 2026, 23:33 UTC

Which program and airline costs you least

London to Seattle in business class starts at 85K Atmos points plus $424.69 — British Airways through Atmos Rewards.

Every way to book LCY to SEA with miles or points
Airline	Program			Book
British Airwaysvia DUB, PHLlast seen 17 Oct, not re-checked sinceAtmos Rewards	Atmos Rewards	Fewest points85K Atmos pointsplus $424.69	Lowest fees$424.69
KLMvia AMS, CDGlast seen 17 Oct, not re-checked sinceAir France-KLM Flying Blue	Air France-KLM Flying BlueLight fare	173Kplus $828.69	$828.69

Where the space is over the next 60 days

Dashed days are prices last seen more than 3 days ago and not re-checked since.

LCY to SEA in business class: the facts

Over the next 60 days we hold business class seats from London to Seattle on 19 of the 19 departure days we have checked so far (41 days are not checked yet), through 2 programs. These figures are counted from the seats stored for those dates, not from a price history; the typical day is the median of each day's cheapest seat. Data updated October 17, 2026.

Atmos Rewards
Days with space
16 of 19 checked
Lowest
85,000 Atmos points
Typical day
85,000 Atmos points
Cash on top
$425 to $444
Air France-KLM Flying Blue
Days with space
12 of 19 checked
Lowest
173,000 miles
Typical day
277,500 miles
Cash on top
$829

LCY to SEA business class seats per program over the next 60 days
Program	Days with space	Lowest	Typical day	Cash on top
Atmos Rewards	16 of 19 checked	85,000 Atmos points	85,000 Atmos points	$425 to $444
Air France-KLM Flying Blue	12 of 19 checked	173,000 miles	277,500 miles	$829

Nonstop or with a connection

No nonstop seats in the window. With a connection on British Airways and KLM.

How to book it

Atmos Rewards books on alaskaair.com: sign in there, search LCY to SEA in business class on a date with space, and pay in Atmos points with the cash on top (from $425).
Air France-KLM Flying Blue books on airfrance.fr: sign in there, search LCY to SEA in business class on a date with space, and pay in miles with the cash on top (from $829).

MilesZone finds the seat; it does not book it or take payment.

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Every route we watch from London (LCY)

Get told the moment a LCY → SEA seat opens.

We re-check that exact seat seconds before the email leaves, so what you open is still there.

Email only. Searching this route stays free for departures in the next 60 days.