Best Time to Fly IAD to CVG: On-Time Stats by Hour & Airline
Washington Dulles International → Cincinnati/Northern Kentucky International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 80.8% of Washington (IAD) to Cincinnati (CVG) flights arrived on time (534 scheduled flights). That is 3.1 points above the national average of 77.6%.
Republic Airways was the only reporting airline with regular flights on this route.
September has been the best month (95% on time) and Friday the weakest day of the week (79%).
2.4% of flights were cancelled, versus 1.8% nationally.
IAD to CVG 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 | 80.9% | 83 min | 2.5% | 515 |
| United Airlines | Limited data | 19 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to CVG
On-time arrival % by scheduled departure hour (local time), 928 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 92.0% | 0.5% | 426 |
| 12pm–1pm | 80.8% | 1.3% | 79 |
| 3pm–4pm | Limited data | 3 | |
| 5pm–6pm | 80.3% | 2.6% | 193 |
| 10pm–11pm | 77.7% | 4.8% | 227 |
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 CVG
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 | 29 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 15 | ||
| Summer peak (Jun 15 - Aug 15) | 77.8% | -8.5 pts | 7.0% | 171 |
| All other days | 86.4% | — | 1.0% | 713 |
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).