What are the hours of operation for the CTA?

The Chicago Transit Authority (CTA) operates from approximately 4:00 a.m. to 1:00 a.m. on weekdays, and 24 hours during weekends. The specific hours of operation may vary depending on the line and station. However, the CTA Red and Blue lines provide 24-hour service throughout the week. Additionally, selected bus routes operate during late-night hours, ensuring connectivity during weekends and off-peak times. It's important to note that train frequency may vary outside of rush hours, typically running every 5 to 15 minutes. Passengers are advised to check the CTA website or consult the provided schedules for accurate information and any updates on service changes and temporary closures.