Best Time to Fly BNA to ONT: On-Time Stats by Hour & Airline
Nashville International → Ontario International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 69.0% of Nashville (BNA) to Ontario (ONT) flights arrived on time (336 scheduled flights). That is 8.7 points below the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
August has been the best month (90% on time) and Tuesday the weakest day of the week (62%).
0.3% of flights were cancelled, versus 1.8% nationally.
BNA to ONT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 69.0% | 40 min | 0.3% | 336 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BNA to ONT
On-time arrival % by scheduled departure hour (local time), 642 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 9am–10am | Limited data | 18 | |
| 10am–11am | Limited data | 25 | |
| 11am–12pm | 89.7% | 0.0% | 58 |
| 12pm–1pm | 72.9% | 1.2% | 86 |
| 1pm–2pm | 75.8% | 0.0% | 157 |
| 2pm–3pm | 55.9% | 0.0% | 34 |
| 3pm–4pm | 80.9% | 0.0% | 68 |
| 4pm–5pm | 74.0% | 1.0% | 101 |
| 5pm–6pm | Limited data | 25 | |
| 6pm–7pm | 50.0% | 0.0% | 56 |
| 7pm–8pm | Limited data | 13 | |
| 8pm–9pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BNA to ONT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 11 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 26 | ||
| Summer peak (Jun 15 - Aug 15) | 59.7% | -17.8 pts | 0.0% | 124 |
| All other days | 77.5% | — | 0.4% | 481 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).