Denver (DEN) to Ontario (ONT) flights
Nonstop from Denver International to Ontario International Airport: distance, flying time, which airlines fly it and how often.
Distance
818 mi, great circle
Flying time
typical, gate to gate
Flights a day
average, November 2026
Airlines
passenger airlines
Airlines flying DEN to ONT
Route map
The shortest path over the Earth's surface. Actual tracks vary with winds and airspace. Map © OpenStreetMap contributors.
Cheapest recent fare
Fares found in recent searches load here. You can also compare DEN to ONT fares by month.
Both directions
- Ontario International Airport (ONT) · we don't have ONT's route list yet
- All nonstop routes from Denver (DEN)
- DEN to ONT on the flight-path tool
Frequently asked questions
How long is the flight from Denver to Ontario?
About 2h 24m gate to gate for the 1,316 km (818 mile) trip, estimated from distance. Schedules vary by airline and season, and winds can add or save time.
Which airlines fly nonstop from DEN to ONT?
Frontier Airlines, Southwest Airlines and United Airlines, with about 8.6 flights a day between them in our data (AeroDataBox, November 2026).