Cheap flights from Seattle to London (All Airports)
Seattle to London (All Airports) (SEA → LON). We are tracking 16 fares on this route.
Cheapest tracked fare $299 · typical price $655 · you save about $356 (54%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
—
2027-03-05
1 stop
$299
Icelandair
2026-11-16
1 stop
$324
Icelandair
2026-12-07
1 stop
$324
—
2026-12-13
2 stops
$335
Icelandair
2026-12-14
1 stop
$348
Delta
2026-10-25
Direct
$374
Alaska
2026-11-01
Direct
$374
Delta
2026-11-08
Direct
$374
British Airways
2026-11-15
Direct
$374
British Airways
2026-10-19
Direct
$374
Delta
2026-10-26
Direct
$374
Delta
2026-11-02
Direct
$374
Delta
2026-11-09
Direct
$374
WestJet
2026-11-22
1 stop
$375
Icelandair
2026-11-23
1 stop
$426
Icelandair
2026-11-30
1 stop
$426
Could you save more?
The airport you were going to fly from is often not the cheapest one. Compare every airport in a region against each other, or check whether a multi-day stopover beats the direct fare.
How cheap can flights from Seattle to London (All Airports) get?
The cheapest fare we have tracked on this route is $299, compared with a typical $655 for a trip of this distance.
Is it cheaper to fly to London (All Airports) from a different airport?
Often, yes. Fares out of secondary airports are frequently cheaper than the obvious hub, but they are the ones most likely to be missing from a normal search. Our reverse search compares every airport in a region against each other so the cheaper departure point is not hidden.
Could a stopover make Seattle to London (All Airports) cheaper?
Sometimes. On thin long-haul routes a two-leg trip with a multi-day stopover can beat the direct fare, and occasionally a direct fare is not sold at all. Our detour search prices those routings against the direct flight.