Estadio BBVA is in Guadalupe, the eastern Monterrey suburb — about 14 km from Centro / Macroplaza, 20 km from MTY airport. The dominant choice is Metrorrey Línea 1 to Lerdo de Tejada + ~12-min walk (~$9.40 MXN, ~50 min from Centro with the L2→L1 transfer at Cuauhtémoc). Uber/Didi works without surge in most cases. Allow 2.5 hours pre-kickoff for FIFA security perimeter + 35°C+ heat handling.
Monterrey International Airport (MTY) is in Apodaca, ~25 km northeast of Centro. Mexico's third-busiest airport. Direct flights from Houston (3.5h drive instead — see below), Dallas, NYC, Madrid, plus AeroMéxico from MEX/GDL.
Monterrey's June heat (regularly 35°C+) means match-day prep matters more than altitude. Hydrate aggressively, avoid spicy food in the 3 hours pre-kickoff, plan for sweat-through clothes.
Monterrey has the most US-like road grid of any Mexican host city. Metrorrey covers core east-west axes; Uber/Didi for everything else. Driving is feasible if you're confident in Mexican traffic.