Denver to Ontario flights
Direct and connecting flights from Denver International Airport (DEN) to Ontario International Airport (ONT) — airlines, aircraft types, and the safety record for this route.
Route FAQ
How long does the flight from Denver to Ontario take?
Flight time from Denver (DEN) to Ontario (ONT) depends on routing, aircraft type, and whether the flight is direct or connecting. A direct flight typically reflects great-circle distance plus winds, while one-stop options can add several hours depending on the layover airport. The typical block time and frequency we have observed for this route are shown above.
Which airlines fly from Denver to Ontario?
Airline availability for DEN to ONT changes by season and sometimes week to week as carriers adjust capacity. The airlines and aircraft types observed operating this route, both direct and connecting, are listed below based on real flight-tracking data.
Are there direct flights from Denver to Ontario?
Direct (nonstop) availability on DEN to ONT varies by date, day of week, and season. Busy city pairs usually have multiple daily nonstops, while thinner routes may only have direct service a few days per week or only during peak seasons.
No fatal or serious occurrence recorded and attributed to operators on this pair in the last 90 days.
- Frontier Airlines5-yr attributed events: 7Last 90 days: none recorded
- Southwest Airlines5-yr attributed events: 40Last 90 days: none recorded
- UPS5-yr attributed events: 5Last 90 days: none recorded
| Carrier | Sightings / 90d | Safety events |
|---|---|---|
| Frontier Airlines | 4 sightings | No recorded events |
| Southwest Airlines | 3 sightings | No recorded events |
| UPS | 2 sightings | No recorded events |
Planning DEN → ONT
DEN to ONT is a short-haul route of 1,316 km (818 mi). See the return ONT → DEN route.
Alternative airports near Denver: Buckley (BFK) — 19 km, Denver (APA) — 36 km, Broomfield-CO (BJC) — 38 km.
Alternative airports near Ontario: Upland (CCB) — 10 km, Chino (CNO) — 10 km, La Verne (POC) — 17 km.