British Airways, Finnair, American Airlines, and various other airlines have round-trip flights from Dallas (DFW) to Inverness (INV) for $501-$525 with a connection. Flights October to February. Departures on Monday, Tuesday, Wednesday, and Sunday. 7-day minimum stay required.
COVID restrictions are currently in place, but this may be worthwhile for the dates this fall into 2022 depending on how things go with COVID restrictions moving forward.