OntarioDenverDirect FlightsONT–DEN
Ontario (Ontario International Airport) to Denver (Denver International Airport).
Flight time from ONT to DEN is estimated at about 2h 16m, based on the 818-mile great-circle distance. Our current captured departure sample includes 8-9/day across 3 captured airlines, with Southwest Airlines appearing most often in that sample. Captured departure times run from 05:00 to 18:30 local time.
Plan this routeAt a glance
| Est. flight time | Distance | Captured freq. | Type |
|---|---|---|---|
| ~2h 16m Estimated from great-circle distance — no tracked flights yet. | 818 mi | 8-9/day From the current provider sample; confirm live timetables before booking. | Domestic |
Airlines on this route
Captured airlines for ONT to DEN
Our current provider sample includes 8-9/day from ONT to DEN across 3 captured airlines. Captured departure terminal data is available for 4, 2.
- First departure
- 05:00
- Last departure
- 18:30
- Cadence
- ~hourly
- Captured departures/day
- 19
| Airline | Captured daily freq. | Aircraft | Departures (local) |
|---|---|---|---|
| Southwest Airlines | 3-4/day | Boeing 737 · Terminal 4 · Seat map | 05:4505:50 |
Aircraft on this route
Flying the other way?
DEN to ONT flights — 8-9/day on 3 airlines →Methodology: airline, aircraft, terminal, and departure-time details come from the rolling scheduled-departures window for ONT to DEN, last seen June 15, 2026. Frequency uses 59 scheduled departures across 7 observed days; flight time is estimated from great-circle distance until this route has enough tracked flights for an observed average. Provider coverage can miss operators on some routes, so confirm live timetables before booking.
Route FAQ
How long is the flight from ONT to DEN?
The ONT to DEN flight time is estimated at about 2h 16m from great-circle distance until enough tracked flights are available.
How far is ONT from DEN?
ONT to DEN is about 818 miles by air.
Which airlines fly from ONT to DEN?
Our current provider sample for ONT to DEN includes Southwest Airlines, United Airlines, Frontier Airlines. Confirm live timetables before booking.
What aircraft fly from ONT to DEN?
Aircraft captured in our current provider sample for ONT to DEN include Airbus A320 family, Boeing 737, Boeing 737, Airbus A320 family.