Monterrey and Mexico City are on the same time. Both cities use Central Time (CST/CDT, UTC-6/-5). When it's 12:00 PM in Monterrey, it's also 12:00 PM in Mexico City.
Both cities observe daylight saving time on the same schedule, keeping them synchronized year-round.
Any time works! Since both cities share the same time zone, you can call during normal business hours (9:00 AM - 6:00 PM) without any conversion needed.
Monterrey and Mexico City are Mexico's two largest economic centers. Monterrey is known as Mexico's industrial capital, while Mexico City is the political and cultural capital. Flights between the cities take about 1.5 hours.