Best Times to Call Houston from Around the World

Houston is the fourth-largest city in the United States and a global hub for energy, healthcare, and aerospace. Whether you're coordinating with NASA's Johnson Space Center, scheduling a meeting with an oil and gas executive, or simply calling family, knowing the right time to call can make or break your connection.

Houston operates on Central Time (CT) — CST (UTC−6) during standard time (November–March) and CDT (UTC−5) during daylight saving time (March–November). This seasonal shift changes your calling window by one hour, so it's important to know which offset applies.

Here are the optimal calling windows when both you and your Houston contact are within normal business hours (9 AM–5 PM):

Your Location	UTC Offset	Best Time (Your Local)	Houston Time
London, UK	UTC+0 / +1	3:00 PM – 5:00 PM	9:00 AM – 11:00 AM
Berlin, Germany	UTC+1 / +2	4:00 PM – 6:00 PM	9:00 AM – 11:00 AM
Dubai, UAE	UTC+4	7:00 PM – 9:00 PM	9:00 AM – 11:00 AM
Mumbai, India	UTC+5:30	8:30 PM – 11:30 PM	9:00 AM – 12:00 PM
Tokyo, Japan	UTC+9	12:00 AM – 2:00 AM (next day)	9:00 AM – 11:00 AM
Sydney, Australia	UTC+10 / +11	1:00 AM – 3:00 AM (next day)	9:00 AM – 11:00 AM
São Paulo, Brazil	UTC−3	12:00 PM – 4:00 PM	10:00 AM – 2:00 PM

Pro tip: For Asia-Pacific callers, consider early-morning Houston time (7–8 AM CT) — many Houston professionals start their day early, especially in the energy sector.

Houston observes DST from the second Sunday in March to the first Sunday in November. During this period, the UTC offset changes from −6 to −5. Here's how this affects specific corridors:

• London ↔ Houston: The gap narrows from 6 hours to 5 hours when both observe DST. However, there are 2–3 weeks in March and October when only one side has switched, creating a temporary 5- or 7-hour difference.
• Tokyo ↔ Houston: Japan doesn't observe DST, so the gap is 15 hours in winter and 14 hours in summer.
• Sydney ↔ Houston: Both observe DST but in opposite seasons, causing the gap to range from 14 to 17 hours throughout the year.

Houston's business culture is generally friendly and direct. Here are some tips for international callers:

• Lunch hour (12–1 PM CT) is a common break — try to avoid scheduling calls during this window.
• Friday afternoons tend to wind down early, especially in summer.
• The energy sector often starts early (7 AM CT), while tech companies may lean later (10 AM CT).
• Houston area codes include 713, 281, 832, and 346 — all are local Houston numbers.

When calling Houston from outside the US, dial +1 followed by the area code and number. Houston's primary area codes are:

• 713 — Original Houston area code (inner city)
• 281 — Suburban Houston and surrounding areas
• 832 — Overlay covering the entire Houston metro
• 346 — Newest overlay, also metro-wide