San José to Chicago Time Difference
Chicago is 1 hour ahead of San José. When it's 08:20:10 AM in San José, it's 09:20:10 AM in Chicago.
How Many Hours Ahead Is Chicago From San José?
Chicago is 1 hour ahead of San José. So San José is 1 hour behind Chicago looking the other way — the same gap, described from the other end.
In practice that means a working day in San José starts when it is already 10:00 AM in Chicago. The gap is not fixed all year: it becomes on Sunday, November 1, 2026, when Chicago changes its clocks.
Best Time to Call San José and Chicago
Both cities are inside normal business hours between 9:00 AM and 4:00 PM in San José — that's 10:00 AM to 5:00 PM in Chicago. That's a 7-hour window, so a call fits comfortably in either side's working day.
both at work San José only Chicago only neither — hours shown along the strip are San José local time.
Convert a Specific Time
Pick any date and time in San José to see the exact equivalent in Chicago.
Common Times Converted
San José time on the left, Chicago time on the right.
San José to Chicago: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in San José. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| San José | Chicago | Working hours |
|---|---|---|
| 12:00 AM | 1:00 AM | — |
| 1:00 AM | 2:00 AM | — |
| 2:00 AM | 3:00 AM | — |
| 3:00 AM | 4:00 AM | — |
| 4:00 AM | 5:00 AM | — |
| 5:00 AM | 6:00 AM | — |
| 6:00 AM | 7:00 AM | — |
| 7:00 AM | 8:00 AM | — |
| 8:00 AM | 9:00 AM | Chicago only |
| 9:00 AM | 10:00 AM | Both cities |
| 10:00 AM | 11:00 AM | Both cities |
| 11:00 AM | 12:00 PM | Both cities |
| 12:00 PM | 1:00 PM | Both cities |
| 1:00 PM | 2:00 PM | Both cities |
| 2:00 PM | 3:00 PM | Both cities |
| 3:00 PM | 4:00 PM | Both cities |
| 4:00 PM | 5:00 PM | San José only |
| 5:00 PM | 6:00 PM | — |
| 6:00 PM | 7:00 PM | — |
| 7:00 PM | 8:00 PM | — |
| 8:00 PM | 9:00 PM | — |
| 9:00 PM | 10:00 PM | — |
| 10:00 PM | 11:00 PM | — |
| 11:00 PM | 12:00 AM next day | — |
Understanding the San José – Chicago Time Difference
San José runs on America/Costa_Rica, currently CST (UTC-6:00). Chicago runs on America/Chicago, currently CDT (UTC-5:00). The gap of 1 hour is simply the distance between those two offsets.
Chicago observes Daylight Saving Time and San José does not, so the gap between them shifts by an hour twice a year. The next shift is on Sunday, November 1, 2026, when Chicago adjusts its clocks and the difference becomes . Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States.
San José today
Chicago today
Frequently Asked Questions
What is the time difference between San José and Chicago?
Chicago is currently 1 hour ahead of San José. That gap becomes on Sunday, November 1, 2026, when Chicago changes its clocks.
How many hours ahead is Chicago from San José?
Chicago is 1 hour ahead of San José. Looking at it the other way, San José is 1 hour behind Chicago.
What time is it in Chicago when it is 9:00 AM in San José?
When it is 9:00 AM in San José, it is 10:00 AM in Chicago.
Is Chicago ahead of or behind San José?
Chicago is 1 hour ahead of San José. Chicago reaches each point in the day first, so its working day is already finishing while San José is still getting started.
What is the best time to call between San José and Chicago?
Between 9:00 AM and 4:00 PM San José time, which is 10:00 AM to 5:00 PM in Chicago. Both cities are inside normal business hours during that window.
Does the time difference between San José and Chicago change during the year?
Yes. Chicago observes Daylight Saving Time and San José does not, so the gap between them shifts during the year. It changes to on Sunday, November 1, 2026.
What time zones are San José and Chicago in?
San José uses the America/Costa_Rica time zone, currently CST (UTC-6:00). Chicago uses America/Chicago, currently CDT (UTC-5:00).