Carving out a premium routing between the Sierra Nevada and the Languedoc coast requires patience, because there is no single carrier that makes this journey simple. There's no nonstop option, of course — the shortest sensible itinerary for business class from Reno to Montpellier routes you through a major hub before a final European connection, typically via Salt Lake City or Minneapolis on Delta, or through a transatlantic gateway like Paris or Frankfurt on Air France or Lufthansa. In practice, that means Delta One on the long transatlantic leg (either the A330-900 or 767 configuration, depending on gateway), Air France's A350 business class with its staggered, direct-aisle-access seats into Paris-Charles de Gaulle, or Lufthansa's evolving Allegris business suites out of Frankfurt or Munich, followed by a short regional hop down to Montpellier.
Having flown this corridor more times than I can count, my strong preference is routing through Paris rather than Frankfurt or Amsterdam — Air France's connection bank at CDG into Montpellier is comfortable, and arriving at Terminal 2E gives you direct access to their business lounges before the final 90-minute hop south. If you're transiting through Salt Lake on Delta, build in extra buffer time; that hub can get congested with connecting Sierra flights in winter, and a missed connection there is far more disruptive than one in Paris. One insider trick: request the window seat on the regional connector into Montpellier on clear days — the descent over the Cévennes foothills and the Mediterranean coastline is spectacular and rarely crowded on that short leg.
Seasonality matters enormously on this itinerary. January, February, March, October, and November consistently offer the most attractive business class fares, since Provence and Languedoc's peak tourist season (May through September) pushes premium demand — and pricing — sharply higher. Given the complexity of routing options across three alliances-worth of carriers, this is very much a route where setting up fare alerts pays dividends, since business class award and paid fares between Reno and Montpellier can shift quickly depending on which hub city is running a seasonal push.