Warsaw is 7 hours ahead of Chicago. Chicago uses Central Time (CST/CDT) while Warsaw uses Central European Time (CET/CEST). When it's 9:00 AM in Chicago, it's 4:00 PM in Warsaw.
Both cities observe daylight saving time, though they switch on different dates. The time difference is typically 7 hours but can briefly be 6 or 8 hours during transition periods.
Best calling time: 2:00 AM - 10:00 AM Chicago time. This corresponds to 9:00 AM - 5:00 PM in Warsaw. Early morning calls from Chicago are necessary to reach Polish business hours.
Chicago has the largest Polish population outside of Poland, making it a significant cultural and business connection. LOT Polish Airlines operates direct flights between Chicago O'Hare and Warsaw.