Connecting at Ontario airport

Connection time calculator, immigration and security, and how to move between terminals at ONT.

How connections work at ONT

At Ontario airport, as at every airport in the United States, passengers arriving on an international flight must clear immigration (CBP) and customs, collect their checked bags and re-check them, and go through TSA security again before their connecting flight, even when both flights are on the same ticket.

The airport has 2 terminals or concourses (Terminal 2 (American, Alaska, Delta, United, JetBlue, Frontier, Volaris), Terminal 4 (Southwest)). They are not connected after security: changing means going through security again.

Connecting passengers go through a transfer security screening.

Connection time calculator

Is your layover at ONT long enough? Pick your connection and get an estimate with the times of this airport.

Terminals / concourses: Terminal 2 (American, Alaska, Delta, United, JetBlue, Frontier, Volaris), Terminal 4 (Southwest)

Getting between them: Covered walkway between Terminals 2 and 4, before security

Terminal 2 (gates 201–210) handles most airlines and Terminal 4 (gates 401–412) only Southwest. The terminals are linked by a covered walkway before security, but are separate after security.

  • Check your terminal on the boarding pass before going through TSA: changing terminal means going through security again.

Estimate based on typical times at this airport, not your airline's official minimum connection time. Immigration and security lines change with the time of day and season. On a single ticket, the airline must rebook you if you miss the connection; on separate tickets, it does not.

Sources: detaileddrivers.com.

Times are estimates: always check with your airline.

TSA security wait times

Estimated wait at the security checkpoints of ONT right now. When live data is not available, it shows historical averages.

More about ONT

Airport guide Departures Arrivals