Best Time to Fly IAD to CMH: On-Time Stats by Hour & Airline
Washington Dulles International → John Glenn Columbus International
Data through July 2026 · Last updated October 18, 2026
980 flights were scheduled from Washington (IAD) to Columbus (CMH) in the last 12 months, and 83.4% of those that flew arrived on time, 5.8 points above the US average of 77.6%.
United Airlines was the most punctual of the 2 airlines on the route at 85.0%, while Republic Airways trailed at 82.3%.
April has been the best month (91% on time) and Sunday the weakest day of the week (77%).
0.9% of flights were cancelled, versus 1.8% nationally.
IAD to CMH 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 |
|---|---|---|---|---|
| United Airlines | 85.0% | 64 min | 0.3% | 389 |
| Republic Airways | 82.3% | 75 min | 1.4% | 591 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to CMH
On-time arrival % by scheduled departure hour (local time), 1,940 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 91.6% | 0.9% | 349 |
| 9am–10am | Limited data | 1 | |
| 12pm–1pm | 84.4% | 0.0% | 353 |
| 3pm–4pm | 73.3% | 0.0% | 75 |
| 4pm–5pm | 57.1% | 0.0% | 35 |
| 5pm–6pm | 74.8% | 2.0% | 454 |
| 10pm–11pm | 81.2% | 2.1% | 673 |
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 CMH
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 | 25 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 83.3% | -0.0 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 67.7% | -15.6 pts | 4.1% | 266 |
| All other days | 83.3% | — | 0.9% | 1,589 |
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).