Pricing on Austin to Montpellier business class swings hard by season. January, February, and March are the value months — European carriers discount aggressively in winter, and connection availability through Frankfurt, Amsterdam, and Heathrow is wide open, which is when you'll see fares closer to the $2,750–$3,500 range. October and November are the second sweet spot, after peak summer demand fades but before the holiday crunch. Book 3-4 months out for these shoulder-season windows; last-minute searches on this route tend to land in premium economy or push you toward the $6,000+ ceiling. Because Austin is a secondary gateway, award and discount business class seats on the transatlantic segment get claimed early by connecting traffic from Dallas and Houston, so earlier booking matters more here than on routes with true nonstop service.