Check your booking confirmation, not just the airline — Cancún splits Volaris and VivaAerobus into Terminal 2, American, Delta and United into Terminal 3, and Aeroméxico plus most European and low-cost carriers into Terminal 4. Terminal 1 is not an option right now: it has been closed for a rebuild, and ASUR’s own CEO told investors in July 2026 that he expects it back only in the fourth quarter of the year.