Flying Seattle → Barcelona at the front of the plane
Booked well, Seattle to Barcelona in First Class is not an indulgence so much as arithmetic: a flat bed out of Seattle-Tacoma International Airport (SEA), hours of genuine sleep, and a first day in Barcelona you don't lose to recovery.
From Seattle, the marquee product on this route is British Airways First — british club-room comfort with the broadest First Class network across the Atlantic. Depending on your dates, British Airways, Air France, SWISS and Lufthansa all present compelling options, each with a distinct suite and service style.
Sea-Tac's international premium facilities are comfortable and continually improving: Emirates First passengers are hosted in a premium lounge before the Dubai departure, and the European flagships provide elevated partner lounge access. The airport's manageable scale is itself a luxury — check-in to gate rarely takes long, even at peak hours.
On timing: late April through June and September through mid-October are the sweet spots — beach weather without the August crush, when cruise crowds and heat peak together. Mobile World Congress in early March empties the luxury hotel market overnight, so check the calendar. Winter is mild, uncrowded, and remarkably good value; the Gaudí sites without lines are a different experience entirely.