American and Oneworld carriers have round-trip flights from Dallas (DFW) to Nice, Marseille, or Geneva (NCE, MRS, GVA) for $522-$537 with a connection. Flights to Nice or Geneva are between March and April. Marseille has wider availability: February, March, April, October, November, and December. Very few extended weekends available.
Delta has round-trip flights from Dallas (DFW) to Nice (NCE) for $463-$477 with a connection. Flights in September, April, and May. 7-day minimum stay required.
Note: Carry-on bag is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
American and British Airways have round-trip flights from Dallas (DFW) to Nice or Marseille (NCE/MRS) for $535-$555. Flights from September to May. Expect prices to fluctuate by +/- $20.
Note: Fare allows for a free carry-on bag, but checked-bag and seat selection will cost an additional fee. Travelocity has “Regular Economy” tickets available for $578. ($569 basic fare + $9 upgrade)
Note: Book on Expedia or Travelocity. Other sites seem to be more expensive at the moment.
Note: Stick closely to the example dates for this deal to avoid long connection times.
Note: New Years Eve is available if you can do 9-day stay or longer.