Toulouse doesn't get the marketing muscle of Paris or Nice, but for aerospace executives shuttling to Airbus headquarters, it's arguably the most important business destination in southern France—and reaching it comfortably from Houston requires some routing savvy. There's no nonstop option, so business class from Houston to Toulouse means connecting through one of three European gateways: Paris CDG via Air France, Frankfurt via Lufthansa, or London Heathrow via British Airways. My preference, after years of testing all three, leans toward Air France's Houston–Paris nonstop on the 777 or 787, which puts you into CDG's Terminal 2E with a manageable connection to the short Toulouse hop on an A220 or A320, often operated in a slimmer regional business cabin but still worth booking through for the checked-bag and lounge continuity.
Lufthansa's Frankfurt routing appeals if you want a taste of the airline's newer Allegris business seats, though as of now Allegris deployment on Houston-originating aircraft has been inconsistent, so confirm equipment before counting on it—older long-haul business seating with direct aisle access on select configurations is still the more likely reality. British Airways via Heathrow, using Club Suite on the transatlantic leg, offers the most private, door-equipped seat of the three carriers, and Heathrow's Terminal 5 makes for an efficient BA-to-BA connection onward to Toulouse, though allow real buffer time given T5's occasional congestion during peak morning banks.
One insider tip: Toulouse-Blagnac's arrivals hall clears remarkably fast for a regional French airport, so even a tight 70-minute connection window in CDG or LHR rarely leaves you stranded waiting on luggage once you land—it's the departure connection you need to protect, not the arrival. January through March and again in October and November consistently produce the softest business fares on this corridor, largely because Toulouse's aerospace conference calendar quiets down outside spring and early autumn. Given how fares on this specific three-airline routing fluctuate week to week, setting fare alerts remains the smartest way to catch a premium seat before the good inventory disappears.