Air Canada, Austrian, British Airways, American Airlines, and United have round-trip flights from Dallas (DFW) to Vienna (VIE) for $534-$566 with a connection. Flights March to April. 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.