For United Airlines international flights in 2026, the number of free bags depends heavily on your cabin class and your destination. If you are flying in United Polaris business class, United Business, or United Premium Plus, you are typically allowed two free checked bags up to 70 lbs (32 kg) each. For those in United Economy, the allowance varies: flights to Europe, Asia, and Australia usually include one free checked bag (50 lbs / 23 kg), but if you have purchased a "Basic Economy" ticket for an international flight, you may have to pay for your first checked bag unless you are crossing the Atlantic or Pacific (where some Basic Economy fares now include a bag). For travel within the Americas (e.g., U.S. to Mexico or the Caribbean), Economy passengers often have to pay for the first bag unless they have Premier Status or a qualifying MileagePlus credit card. It is always recommended to use the "Baggage Calculator" on the United website or app 24 hours before your flight, as status as a Star Alliance Gold member can also grant an additional free bag regardless of the fare class.