For which type of flights do travelers need to arrive earlier at O'Hare?

Travelers are advised to arrive earlier for international flights at O'Hare Airport for various reasons. International travel typically involves additional processes that are not mandatory for domestic flights. These include going through customs and immigration, which can take significant time, especially during busy travel periods. Additionally, international flights often require passengers to check in at least three hours prior to their scheduled departure to allow sufficient time for document verification and screening of luggage.

Moreover, since international travel may involve transferring to various security protocols and requirements particular to different countries, having extra time helps alleviate stress and ensures that all necessary procedures are followed. Therefore, arriving earlier for international flights significantly enhances the likelihood of a smooth travel experience at the airport.