British Airways has round-trip flights from Seattle (SEA) to London (LHR) for $413-$427, NONSTOP. Flights in January, March, April, and May. Departures on Monday, Tuesday, and Saturday.
Note: Previous deals to London were a bit cheaper on IcelandAir, but those deals required a stop and had inferior baggage allowances. This deal is NONSTOP, and allows for free carry-on bag and seat selection.
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