39 destinations have scheduled flights from ONT, about 556 departures a week. Weekly frequencies come from airline schedules and observed departures, not live status.
| Destination | Flights per week | Airlines | Typical duration |
|---|---|---|---|
| Phoenix Sky Harbor International Airport (PHX) | 62 | Southwest Airlines Co., American Airlines, Envoy Air Inc. | — |
| Seattle–Tacoma International Airport (SEA) | 52 | Alaska Airlines, Delta Air Lines | — |
| Harry Reid International Airport (LAS) | 44 | Southwest Airlines Co., Frontier Airlines, Inc. | — |
| Sacramento International Airport (SMF) | 37 | Southwest Airlines Co. | — |
| Denver International Airport (DEN) | 32 | Southwest Airlines Co., Albatross Airlines, UPS Airlines, Frontier Airlines, Inc. | — |
| Dallas Fort Worth International Airport (DFW) | 31 | American Airlines, Frontier Airlines, Inc., UPS Airlines | — |
| Oakland San Francisco Bay Airport (OAK) | 25 | Southwest Airlines Co., Four Island Air | — |
| Daniel K. Inouye International Airport (HNL) | 22 | Air Transport International Inc., Alaska Airlines, UPS Airlines, ALS | — |
| San Francisco International Airport (SFO) | 20 | Albatross Airlines | — |
| Mineta San Jose International Airport (SJC) | 20 | Southwest Airlines Co. | — |
| Salt Lake City International Airport (SLC) | 19 | Delta Air Lines | — |
| Hartsfield Jackson Atlanta International Airport (ATL) | 18 | Delta Air Lines | — |
| Portland International Airport (PDX) | 16 | Alaska Airlines, UPS Airlines | — |
| Louisville Muhammad Ali International Airport (SDF) | 14 | UPS Airlines, ALS | — |
| Baltimore/Washington International Thurgood Marshall Airport (BWI) | 12 | Southwest Airlines Co. | — |
| William P. Hobby Airport (HOU) | 12 | Southwest Airlines Co. | — |
| Kahului International Airport (OGG) | 12 | Air Transport International Inc., UPS Airlines | — |
| Charles M. Schulz Sonoma County Airport (STS) | 12 | American Airlines, Alaska Airlines | — |
| Charlotte Douglas International Airport (CLT) | 9 | American Airlines | — |
| Perot Field/Fort Worth Alliance Airport (AFW) | 7 | Air Transport International Inc. | — |
| Boise Air Terminal/Gowen Field (BOI) | 7 | Alaska Airlines | — |
| Guadalajara International Airport (GDL) | 7 | Volaris | — |
| Los Cabos International Airport (SJD) | 7 | Volaris | — |
| Taiwan Taoyuan International Airport (TPE) | 7 | Jett8 Airlines Cargo, China Airlines | — |
| Ellison Onizuka Kona International Airport at Keāhole (KOA) | 5 | UPS Airlines | — |
| Frederick W. Smith International Airport (MEM) | 5 | Four Island Air | — |
| Chicago Rockford International Airport (RFD) | 5 | UPS Airlines | — |
| Guanajuato International Airport (BJX) | 4 | Volaris | — |
| Indianapolis International Airport (IND) | 4 | Four Island Air | — |
| Chicago Midway International Airport (MDW) | 4 | Southwest Airlines Co. | — |
| Miami International Airport (MIA) | 4 | UPS Airlines | — |
| King County International Airport - Boeing Field (BFI) | 3 | UPS Airlines | — |
| Dallas Love Field (DAL) | 3 | Southwest Airlines Co. | — |
| Piedmont Triad International Airport (GSO) | 3 | UPS Airlines | — |
| General Francisco J. Mujica International Airport (MLM) | 3 | Volaris | — |
| El Salvador International Airport Saint Óscar Arnulfo Romero y Galdámez (SAL) | 3 | AVIANCA | — |
| Newark Liberty International Airport (EWR) | 2 | UPS Airlines | — |
| George Bush Intercontinental Airport (IAH) | 2 | Frontier Airlines, Inc. | — |
| Orlando International Airport (MCO) | 2 | UPS Airlines | — |
GET /routes returns each scheduled flight from ONT: airline, flight number, departure and arrival time, duration, days of operation and aircraft type.
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