Best Time to Fly IAD to BNA: On-Time Stats by Hour & Airline
Washington Dulles International → Nashville International
Data through July 2026 · Last updated October 18, 2026
1,009 flights were scheduled from Washington (IAD) to Nashville (BNA) in the last 12 months, and 81.9% of those that flew arrived on time, 4.2 points above the US average of 77.6%.
Among 3 airlines, Republic Airways led with 89.2% on time and Allegiant Air was last with 64.9%.
Over 24 months, Monday was the most reliable day (83% on time) and May the worst month (72%).
The cancellation rate was 0.8% (US average 1.8%).
IAD 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 |
|---|---|---|---|---|
| Republic Airways | 89.2% | 58 min | 0.0% | 38 |
| United Airlines | 82.2% | 79 min | 0.8% | 932 |
| Allegiant Air | 64.9% | 72 min | 2.6% | 38 |
| Southwest Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to BNA
On-time arrival % by scheduled departure hour (local time), 2,017 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 90.5% | 0.3% | 594 |
| 9am–10am | Limited data | 19 | |
| 11am–12pm | Limited data | 26 | |
| 12pm–1pm | 87.8% | 1.1% | 448 |
| 1pm–2pm | 76.1% | 0.0% | 117 |
| 3pm–4pm | 63.7% | 1.1% | 92 |
| 4pm–5pm | Limited data | 6 | |
| 5pm–6pm | 72.5% | 0.4% | 691 |
| 6pm–7pm | Limited data | 1 | |
| 8pm–9pm | Limited data | 5 | |
| 9pm–10pm | Limited data | 17 | |
| 10pm–11pm | 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 IAD 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) | 78.6% | -3.8 pts | 0.0% | 42 |
| Christmas & New Year (Dec 20 - Jan 3) | 84.8% | +2.5 pts | 0.0% | 46 |
| Summer peak (Jun 15 - Aug 15) | 76.5% | -5.9 pts | 0.8% | 401 |
| All other days | 82.3% | — | 0.5% | 1,528 |
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).