Best Time to Fly ONT to BNA: On-Time Stats by Hour & Airline
Ontario International → Nashville International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 77.4% of Ontario (ONT) to Nashville (BNA) flights arrived on time (336 scheduled flights). That is in line with 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 (97% on time) and Thursday the weakest day of the week (77%).
0.6% of flights were cancelled, versus 1.8% nationally.
ONT to BNA 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 | 77.4% | 42 min | 0.6% | 336 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ONT to BNA
On-time arrival % by scheduled departure hour (local time), 642 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 97.2% | 0.0% | 37 |
| 6am–7am | 93.3% | 0.0% | 61 |
| 7am–8am | 83.8% | 1.2% | 81 |
| 8am–9am | Limited data | 27 | |
| 9am–10am | 77.3% | 0.8% | 134 |
| 10am–11am | 82.2% | 0.0% | 135 |
| 11am–12pm | 67.2% | 0.0% | 67 |
| 12pm–1pm | 78.6% | 0.0% | 42 |
| 1pm–2pm | 73.9% | 0.0% | 46 |
| 2pm–3pm | Limited data | 12 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ONT to BNA
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) | 72.4% | -10.7 pts | 0.0% | 124 |
| All other days | 83.0% | — | 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).