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Domestic Scheduled Flights
| Origin | Destination | Carier |
| ONT | IAD Washington, DC, DC US | America West Airlines |
| ONT | DFW Dallas / Ft Worth, TX US | America West Airlines |
| ONT | EWR Newark, NJ US | America West Airlines |
| ONT | ORD Chicago, IL US | America West Airlines |
| ONT | DCA Washington, DC, DC US | American Airlines |
| ONT | TPA Tampa, FL US | American Airlines |
| ONT | DFW Dallas / Ft Worth, TX US | American Airlines |
| ONT | EWR Newark, NJ US | American Airlines |
| ONT | HOU Houston, TX US | American Airlines |
| ONT | IAH Houston, TX US | American Airlines |
| ONT | JFK New York City, NY US | American Airlines |
| ONT | LGA New York City, NY US | American Airlines |
| ONT | MDW Chicago, IL US | American Airlines |
| ONT | DCA Washington, DC, DC US | Continental Airlines |
| ONT | DAL Dallas, TX US | Continental Airlines |
| ONT | EWR Newark, NJ US | Continental Airlines |
| ONT | IAH Houston, TX US | Continental Airlines |
| ONT | LGA New York City, NY US | Continental Airlines |
| ONT | DCA Washington, DC, DC US | Delta Air Lines |
| ONT | IAD Washington, DC, DC US | Delta Air Lines |
| ONT | MDW Chicago, IL US | Delta Air Lines |
| ONT | JFK New York City, NY US | JetBlue Airways |
| ONT | DEN Denver, CO | Mesa Airlines, Inc. |
| ONT | MSP Minneapolis, MN | Mesa Airlines, Inc. |
| ONT | STL St. Louis, MO | Mesa Airlines, Inc. |
| ONT | ACV Arcata, CA | Sky West Airlines, Inc. |
| ONT | BFL Bakersfield, CA | Sky West Airlines, Inc. |
| ONT | CEC Crescent City, CA | Sky West Airlines, Inc. |
| ONT | CLD Carlsbad, CA | Sky West Airlines, Inc. |
| ONT | COS Colorado Springs, CO | Sky West Airlines, Inc. |
| ONT | DEN Denver, CO | Sky West Airlines, Inc. |
| ONT | FAT Fresno, CA | Sky West Airlines, Inc. |
| ONT | IPL El Centro, CA | Sky West Airlines, Inc. |
| ONT | LAX Los Angeles, CA | Sky West Airlines, Inc. |
| ONT | MRY Monterey, CA | Sky West Airlines, Inc. |
| ONT | OAK Oakland, CA | Sky West Airlines, Inc. |
| ONT | OXR Oxnard, CA | Sky West Airlines, Inc. |
| ONT | PHX Phoenix, AZ | Sky West Airlines, Inc. |
| ONT | RDD Redding, CA | Sky West Airlines, Inc. |
| ONT | SAN San Diego, CA | Sky West Airlines, Inc. |
| ONT | SBA Santa Barbara, CA | Sky West Airlines, Inc. |
| ONT | SBP San Luis Obispo, CA | Sky West Airlines, Inc. |
| ONT | SFO San Francisco, CA | Sky West Airlines, Inc. |
| ONT | SGU St. George, UT | Sky West Airlines, Inc. |
| ONT | SJC San Jose, CA | Sky West Airlines, Inc. |
| ONT | SLC Salt Lake City, UT | Sky West Airlines, Inc. |
| ONT | SMF Sacramento, CA | Sky West Airlines, Inc. |
| ONT | SMX Santa Maria, CA | Sky West Airlines, Inc. |
| ONT | SNA Santa Ana, CA | Sky West Airlines, Inc. |
| ONT | TUS Tucson, AZ | Sky West Airlines, Inc. |
| ONT | VIS Visalia, CA | Sky West Airlines, Inc. |
| ONT | YUM Yuma, AZ | Sky West Airlines, Inc. |
| ONT | TPA Tampa, FL US | Southwest Airlines |
| ONT | DAL Dallas, TX US | Southwest Airlines |
| ONT | HOU Houston, TX US | Southwest Airlines |
| ONT | MDW Chicago, IL US | Southwest Airlines |
| ONT | IAD Washington, DC, DC US | United Airlines |
| ONT | TPA Tampa, FL US | United Airlines |
| ONT | ORD Chicago, IL US | United Airlines |
There is over 59 domestic flights from ONT airport.
