Terminals · ORD
Aer Lingus departs from Terminal 3 at O'Hare International Airport (ORD). We verified this against the airport's own sources on June 27, 2026 — airlines do move terminals, so we date every check.

Aer Lingus departs from Terminal 3 at O'Hare International Airport (ORD). Departs from Terminal 3 (ground-handled by American/oneworld). Verified June 27, 2026.
Terminal 3 ticketing. Bag drop usually closes 45 minutes before departure, so build that into your morning.
Aer Lingus moved departures from Terminal 5 to Terminal 3 on January 24, 2024 (earlier than British Airways and Iberia, which moved in April 2024). We confirmed Aer Lingus's current Terminal 3 on June 27, 2026.
Terminal 3 for departures; flights from Dublin/Shannon use U.S. preclearance (arrive as domestic). Non-precleared arrivals process via Terminal 5 CBP.
Not sure which building that is? See all ORD terminals with the airport map and how to get between them. Then let your Leave-By Time count backward from your flight — today's ORD security wait, your drive, and the walk to your gate — so you leave with room to breathe.