Airport Security Guide

Ontario (ONT) Security Tips

ONT has 2 security checkpoints with TSA PreCheck lanes and CLEAR biometric lanes. Security is busiest 5–8 AM and 4–7 PM. Use the Leave-By Time calculator to fold the modeled ONT wait forecast, your drive, and gate-walk into one exact departure time.

How many security checkpoints does ONT have?

ONT has 2 security checkpoints across 2 terminals (2, 4). TSA PreCheck dedicated lanes are available, giving members a faster, bin-free screening experience. PreCheck is open at the main checkpoints during regular screening hours, though an individual lane can close off-peak. CLEAR biometric kiosks are also deployed at ONT, letting enrolled members skip the ID-verification queue entirely. See CLEAR at ONT for details.

When is ONT security busiest?

ONT security lines are typically longest during 5–8 AM and 4–7 PM. Outside those windows, wait times drop substantially — check the ONT wait forecast for the current picture before you head out. General guidance:

• Domestic flights: arrive at least 2 hours before departure; 2.5 hours during peak periods.
• International flights: arrive at least 3 hours before departure to cover check-in, security, and any customs pre-clearance.

Not sure when to leave? The Leave-By Time calculator uses the modeled ONT wait forecast, real-time traffic, and your gate-walk distance to give you an exact departure time. Also see how early to arrive at the airport for a full breakdown by flight type.

Which ONT security checkpoint is fastest?

Use the checkpoint matching your terminal — T2 for most carriers, T4 for American and Southwest; no post-security connection between the two terminals.

CLEAR is available at ONT and can be stacked with TSA PreCheck for the fastest path through security: CLEAR handles the biometric ID verification, PreCheck handles the bin-free lane. If you frequently travel through ONT during peak windows, combining both programs is the most effective approach. See CLEAR at ONT for kiosk locations and current status.

What are the top ONT airport security tips?

These tips are specific to Ontario (ONT) and verified against current airport configuration:

• ONT averages 10–20 minutes standard wait — the fastest security in the greater Los Angeles region — but Terminal 2 and Terminal 4 have no airside post-security connection; confirm your terminal before clearing.
• American and Southwest depart from Terminal 4; all other major carriers (Alaska, Delta, JetBlue, United, Frontier) use Terminal 2.
• CLEAR enrollment kiosks are at both terminals (daily 6 AM–7 PM) with no appointment required — convenient for enrolling on the day of travel.
• TSA checkpoint expansion is underway with Terminal 2 adding 2 lanes and Terminal 4 adding 1 lane; improved throughput is expected by late 2026.

Does ONT have TSA PreCheck?

Yes — ONT has TSA PreCheck lanes at its security checkpoints. PreCheck members keep shoes, belts, light jackets, laptops, and 3-1-1 liquids packed, and pass through a dedicated screening lane. Membership costs $85–$100 for five years and includes a Known Traveler Number (KTN) you add to every booking.

See live PreCheck wait times and current lane status on the ONT TSA PreCheck page. That page also covers which terminals have a PreCheck lane, enrollment locations, and how PreCheck compares to CLEAR and Global Entry at ONT.

Global Entry interviews can be completed at ONT itself — via an on-site enrollment center or Enrollment on Arrival after an international flight — and membership includes TSA PreCheck. See Global Entry at ONT for locations and hours.

ONT security at a glance

See also: Live ONT TSA wait times · TSA PreCheck at ONT · CLEAR at ONT · How early to arrive at the airport