What factor should travelers consider when deciding how early to arrive at O'Hare?

When planning how early to arrive at O'Hare, the time of travel is a critical factor because it directly influences several elements of the travel experience. Peak travel times, such as morning and evening rush hours, typically result in heavier passenger volumes and longer wait times at check-in, security, and boarding. Additionally, different times of the day can affect ground transportation availability and traffic conditions, further impacting the overall travel timeline.

While airport size and flight length are relevant considerations, they do not have the same immediate effect on the time management aspect of arriving at the airport. An understanding of peak periods helps travelers gauge the potential for delays and crowded areas, helping ensure they allocate sufficient time for each stage of their journey.