cached prices · United States fares · USD
The cheapest one-way fare from Seattle to London we have seen is $705 USD, departing Sep 29 (found Sep 22): Alaska Airlines AS 328, 2 stops, 25h14m.
Cheapest seen · One wayfound Sep 22
$705 USD
Alaska Airlines AS 328 · Sep 29 · 2 stops · 25h14m
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Cheapest round trip seen
$422 USD
Icelandair FI 680 · Nov 7 → Nov 21 · 2 stops · 25h00m in all, both ways
about this route
No nonstop fare is held for the 4 departure dates seen — every row has at least one stop; carriers seen: Air Canada, Alaska Airlines, JetBlue, British Airways, Aer Lingus, Icelandair, United.
SEA serves Seattle, United States; LHR serves London, United Kingdom.
London runs 8 hours ahead of Seattle.
by month
Sep 2026
$705 USD
checked Sep 26
by date
4 rows held, cheapest first — the cheapest nonstop and the cheapest with stops seen for each departure date.
Sep 29 · 00:16 SEA
AS3282 stops · 25h14m
found Sep 22 · baggage and fare rules are shown by the seller — this price is the cached fare only
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Sep 27 · 23:42 SEA
B63983 stops · 46h48m
found Sep 22 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Sep 28 · 19:10 SEA
EI522 stops · 43h00m
found Sep 22 · baggage and fare rules are shown by the seller — this price is the cached fare only
$1,163 USD
Continue on the seller's site — $1,163a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Sep 26 · 05:50 SEA
AC88012 stops · 22h25m
found Sep 22 · baggage and fare rules are shown by the seller — this price is the cached fare only
$1,264 USD
Continue on the seller's site — $1,264a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
round trips
The cheapest out-and-back pairs the cache holds, any dates.
Nov 7 → Nov 21 · 14:35 SEA
FI6802 stops · 25h00m in all, both ways
found Sep 23 · baggage and fare rules are shown by the seller — this price is the cached fare only
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Nov 7 → Nov 21 · 18:45 SEA
AS100Nonstop · 19h50m in all, both ways
found Sep 23 · baggage and fare rules are shown by the seller — this price is the cached fare only
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Mar 1 → Mar 31 · 14:35 SEA
FI6802 stops · 33h45m in all, both ways
found Sep 25 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Mar 5 → Apr 4 · 14:35 SEA
FI6802 stops · 40h45m in all, both ways
found Sep 24 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Nov 21 → Nov 27 · 18:45 SEA
AS100Nonstop · 19h50m in all, both ways
found Sep 19 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Nov 21 → Nov 28 · 23:17 SEA
UA15382 stops · 47h08m in all, both ways
found Sep 19 · baggage and fare rules are shown by the seller — this price is the cached fare only
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Sep 26 → Oct 3 · 13:22 SEA
UA22812 stops · 32h28m in all, both ways
found Sep 20 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Sep 26 → Oct 3 · 21:40 SEA
AS100Nonstop · 19h25m in all, both ways
found Sep 20 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Mar 1 → Mar 31 · 18:45 SEA
BA048Nonstop · 19h10m in all, both ways
found Sep 25 · baggage and fare rules are shown by the seller — this price is the cached fare only
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Oct 11 → Oct 18 · 10:50 SEA
UA82422 stops · 36h04m in all, both ways
found Sep 24 · baggage and fare rules are shown by the seller — this price is the cached fare only
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Mar 5 → Apr 4 · 18:45 SEA
BA048Nonstop · 19h10m in all, both ways
found Sep 24 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Nov 21 → Nov 28 · 18:45 SEA
AS100Nonstop · 19h50m in all, both ways
found Sep 19 · baggage and fare rules are shown by the seller — this price is the cached fare only
a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Oct 11 → Oct 18 · 21:40 SEA
AS100Nonstop · 19h25m in all, both ways
found Sep 24 · baggage and fare rules are shown by the seller — this price is the cached fare only
$1,100 USD
Continue on the seller's site — $1,100a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Dec 19 → Dec 25 · 14:35 SEA
FI6802 stops · 33h40m in all, both ways
found Sep 19 · baggage and fare rules are shown by the seller — this price is the cached fare only
$1,131 USD
Continue on the seller's site — $1,131a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
Dec 19 → Dec 25 · 18:55 SEA
AS100Nonstop · 19h30m in all, both ways
found Sep 19 · baggage and fare rules are shown by the seller — this price is the cached fare only
$1,281 USD
Continue on the seller's site — $1,281a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
carriers
Marketing carriers; the operating airline is shown by the seller.
questions
more routes
Return: Flights from London (LHR) to Seattle (SEA) →Every route from Seattle →Every route to London →
Other destinations with a cached fare from this origin, cheapest first.
Other origins with a cached fare to this destination, cheapest first.