Air France, American Airlines, and British Airways have round-trip flights from Dallas (DFW) to Marseille or Zurich (MRS, ZRH) for $445-$467 with a connection. Flights November to March. Departures on Monday, Tuesday, Wednesday, and Sunday. 7-day minimum stay required. Holiday blackouts.
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.