Major carriers serving the IAH–MBJ market include United Airlines (IAH hub with seasonal/nonstop options), American Airlines (one-stop via DFW or MIA depending on routing), and regional or international carriers offering connecting services. United often provides the most direct routing from Houston with cohesive baggage policies and loyalty benefits, while American offers extensive connecting options through its hubs. Budget-conscious travelers should compare one-stop itineraries for savings; also factor in seat pitch, included baggage, onboard service, and schedule frequency when choosing a carrier. CTA: Compare airlines side-by-side for price, flight duration, and baggage rules before booking for January.