Where is lost and found? March 03, 2023 20:50 Updated The Lost and Found office is located in Terminal 2, behind the information desk. More info can be found at flyontario.com/lost-found. Related articles How do I contact ONT airport? I lost an item at TSA security, what do I do? What are the approved types of identification I can show at the checkpoint in order to travel? Who do I contact if my luggage was lost with my airline or I left something on the aircraft?