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| Domestic flights | ~120 min before departure |
| International flights | ~180 min before departure |
O'Hare's terminals are large and security lines vary widely by checkpoint — check the airport's live wait-time information if available.
Arrive at least 120 minutes before departure for a domestic flight at Chicago O'Hare (ORD).
Arrive at least 180 minutes before departure for an international flight at Chicago O'Hare (ORD).
Security and check-in congestion here is high — this airport is known for slower lines, so err toward the longer end or add extra buffer O'Hare's terminals are large and security lines vary widely by checkpoint — check the airport's live wait-time information if available.
Yes — bag-drop lines can add 15-30 minutes at busy airports, so lean toward the longer end of the recommended range if you're not carry-on only.