Delta, KLM, British Airways, Iberia and various other airlines have round-trip flights from Seattle (SEA) to Inverness, Scotland (INV) for $401-$499 with a connection. Flights January to March. Departures on Monday, Tuesday, Wednesday, and Sunday. 7-day minimum stay required.
A Carry-on bag and also a personal item is allowed for free. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.