After a dozen crossings between Texas and the Carpathians, I can say with confidence: there is no nonstop option here, and business class from Houston to Bucharest always routes through a major European or Turkish hub, with total journey times stretching well past 12 hours once you factor in the connection. The two most sensible itineraries run through Munich or Frankfurt on Lufthansa, or through Istanbul on Turkish Airlines, with TAROM occasionally slotting in for the final leg into OTP on a codeshare or standalone ticket. Lufthansa's long-haul IAH–Frankfurt/Munich sectors are increasingly outfitted with the new Allegris business suites, though older 747-8 and A340 configurations still appear on this route, so it's worth checking your aircraft type before booking if a door-equipped suite matters to you. Turkish Airlines, meanwhile, offers a reliably strong business class product with lie-flat seats and their well-regarded onboard dining service, and Istanbul's connection to Bucharest is short and efficient.
My personal preference leans toward routing via Munich rather than Frankfurt when Lufthansa is involved — Munich's Terminal 2 satellite has noticeably shorter walks and a calmer security experience for business class passengers making tight connections, something Frankfurt's sprawling layout can't match during peak afternoon banks. If Istanbul is your hub, build in extra buffer time regardless of how short the layover looks on paper, since IST's scale means gate-to-gate transfers can eat 40 minutes even in priority lanes. Bucharest's Henri Coandă Airport itself is compact and low-stress on arrival, a pleasant contrast to the hub chaos beforehand, and TAROM's ground handling for connecting premium passengers there is efficient given the airport's modest size.
Seasonally, January through March and again in October and November tend to yield the most attractive business class availability and pricing on this corridor, since Romania's tourist crush is concentrated in summer and around Christmas markets. Because award space and fare sales on these Lufthansa, Turkish, and TAROM routings shift quickly and unpredictably, setting up automated fare alerts is genuinely the smartest way to catch a favorable window before it closes.
