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Ontario International Airport in Ontario, United States has 36 nonstop destinations in FlightQ's current schedule set. This page ranks named carriers by how many destinations they serve from ONT, with top routes and scheduled flight counts.
Schedule snapshot checked Sep 28, 2026.
The broadest named carrier from ONT is Southwest Airlines, with 12 nonstop destinations in this data set. Popular destinations from the airport include Denver (DEN), Seattle (SEA), Las Vegas (LAS), and Phoenix (PHX).
| Airline | Destinations | Flights | Top routes |
|---|---|---|---|
| Southwest Airlines | 12 | 221 | |
| Alaska Airlines | 6 | 78 | |
| Frontier Airlines | 6 | 52 | |
| West Air (USA) | 6 | 37 | |
| United Airlines | 4 | 58 | |
| Delta Air Lines | 3 | 65 | |
| Volaris | 3 | 18 | |
| American Airlines | 2 | 54 | |
| Empire Airlines | 2 | 7 | |
| China Airlines | 1 | 7 | |
| JetBlue | 1 | 7 | |
| Starlux | 1 | 4 | |
| Avianca | 1 | 3 | |
| China Central Airlines | 1 | 2 |
Flight counts are the scheduled rows captured in the current sample window, not annual totals. The destination count is a better comparison for network breadth.
Southwest Airlines has the broadest named-carrier coverage in FlightQ's current ONT schedule set, with 12 nonstop destinations listed here.
FlightQ currently identifies 14 airlines serving 36 nonstop destinations from ONT.
Airlines add, pause, and retime routes seasonally. This page is built from FlightQ's current schedule capture, so use it for route research and confirm exact dates before booking.