prices we've seen · United States fares · USD
The cheapest one-way fare from Seattle (SEA) to London (LHR) we have seen is $225 USD, departing Nov 23, 2026 (seen Nov 9, 2026): Icelandair FI 680, 1 stop, 20h 55m.
Cheapest · One wayseen Nov 9
$225 USD
Icelandair FI 680 · Nov 23 · 1 stop · 20h 55m
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Checked Nov 11
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Each day's cheapest fare we've seen, nonstop and with stops. Cheapest first.
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Compared with Seattle → London: $225 one way (Nov 23).
Marketing carriers; the operating airline is shown by the seller.
The cheapest one-way fare from Seattle (SEA) to London (LHR) we have seen is $225 USD, departing Nov 23, 2026 (seen Nov 9, 2026): Icelandair FI 680, 1 stop, 20h 55m.
Nonstop fares were seen on 5 of the 5 departure dates; carriers seen: Alaska Airlines, British Airways, Icelandair, Sun Country Airlines, WestJet.
By month, Nov 2026 is the cheapest we've seen at $225 USD and Jan 2027 the most expensive at $468 USD — a spread of 108%.
It is the cheapest fare we've seen for that date; the date beside it is the day it was seen, or our last check. We look again at least once a day for the routes people search, and stop showing a route's prices two days after our last look. The seller's page shows the price right now.
By price and duration only; commission never enters the order. Cheapest means cheapest among the fares we've seen for this route. A click that books may earn a2bflight a commission from the seller; the price you see is the seller's own. See how we rank and what we keep.