Montpellier's small regional airport doesn't accept widebody service from the US, which means there's no nonstop option — every itinerary in business class from Las Vegas to Montpellier routes through a major European or East Coast hub, and the connection choice matters as much as the front-cabin product itself. Delta typically routes passengers through Amsterdam or Paris via a domestic connection from Las Vegas to JFK or Atlanta, putting you into Delta One suites with sliding doors on the transatlantic long-haul segment before a short Air France or KLM regional hop finishes the journey. Air France favors a Paris CDG connection, and if you're fortunate enough to draw one of their A350s on the transatlantic leg, the newer business class seats with more privacy and better bedding are a noticeable upgrade over older 777 configurations still flying some rotations. Lufthansa's routing typically funnels through Frankfurt or Munich, and depending on aircraft assignment you may encounter their newer Allegris business class suites, though the rollout remains uneven across the fleet, so it's worth checking your specific aircraft before booking.
Having flown this corridor more times than I can count, my strongest advice is to treat the Las Vegas domestic connection as the fragile link in the chain — build in at least a two-hour buffer, since McCarran's afternoon departure banks can back up during peak convention weeks, and a missed connection here cascades badly into a tight European transfer. Frankfurt and Amsterdam are far more forgiving than CDG for a tight connection onto the Montpellier regional flight, so if given a routing choice, favor those hubs over Paris when your layover is under ninety minutes. Seasonally, Provence and Languedoc traffic is thin outside of summer, which works in your favor: January through March and October into November consistently produce the softest business class demand and the most award space on all three carriers.
Given how much these fares swing with hub routing, aircraft swaps, and seasonal demand from Vegas's convention calendar, this is very much a route where setting up fare alerts pays off — tracking price movements over a few weeks often reveals a meaningfully better business class fare than booking on impulse.
