Ontario, California · field elev 944 ft
Density Altitude at Ontario International (KONT)
Ontario International sits at 944 ft, and even a typical August afternoon (95 °F) only lifts density altitude to about 3,433 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 56.1 | 993 ft | 67.7 | 1,746 ft |
| February | 57.1 | 1,059 ft | 68.1 | 1,771 ft |
| March | 60.2 | 1,261 ft | 71.7 | 2,000 ft |
| April | 63.4 | 1,469 ft | 75.7 | 2,253 ft |
| May | 67.7 | 1,746 ft | 79.8 | 2,509 ft |
| June | 73.2 | 2,095 ft | 86.4 | 2,917 ft |
| July | 79.2 | 2,472 ft | 93.8 | 3,367 ft |
| August | 80.1 | 2,528 ft | 94.9 | 3,433 ft |
| September | 77.6 | 2,372 ft | 91.3 | 3,216 ft |
| October | 69.8 | 1,880 ft | 82.6 | 2,683 ft |
| November | 61.9 | 1,372 ft | 74.7 | 2,190 ft |
| December | 55.2 | 934 ft | 66.9 | 1,694 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for KONT
DENSITY ALTITUDE
Field elevation 944 ft — the air behaves like 3,439 ft.
- PRESSURE ALT
- 945 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby California fields
- KCNO — Chino
Chino · elev 650 ft
- KCCB — Cable
Upland · elev 1,444 ft
- KPOC — Brackett Field
La Verne · elev 1,014 ft
- KAJO — Corona Municipal
Corona · elev 533 ft
- KRAL — Riverside
Riverside · elev 819 ft
- KRIR — Flabob
Riverside/Rubidoux/ · elev 767 ft
- KSBD — San Bernardino International
San Bernardino · elev 1,159 ft
- KRIV — March Arb
Riverside · elev 1,536 ft
Frequently asked questions
How high does density altitude get at KONT in summer?
On a typical August afternoon — around 95 °F at the nearest NOAA normals station — density altitude at Ontario International reaches roughly 3,433 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at KONT on an average day?
It swings with the seasons: from roughly 934 ft at the coldest month's average temperature to about 2,528 ft at the warmest month's — all from a constant field elevation of 944 ft. The month-by-month table above carries the full year.
What is the field elevation of Ontario International?
944 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KONT (ICAO) / ONT (FAA), in Ontario, California.