Best Time to Fly CHS to IAD: On-Time Stats by Hour & Airline
Charleston AFB/International → Washington Dulles International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.9% of Charleston (CHS) to Washington (IAD) flights arrived on time (758 scheduled flights). That is 7.3 points above the national average of 77.6%.
United Airlines was the most punctual of the 2 airlines on the route at 86.0%, while Republic Airways trailed at 83.3%.
September has been the best month (95% on time) and Sunday the weakest day of the week (83%).
1.1% of flights were cancelled, versus 1.8% nationally.
CHS to IAD 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 | 86.0% | 96 min | 0.7% | 459 |
| Republic Airways | 83.3% | 91 min | 1.7% | 299 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CHS to IAD
On-time arrival % by scheduled departure hour (local time), 1,513 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 93.3% | 0.0% | 60 |
| 9am–10am | 93.4% | 1.3% | 77 |
| 10am–11am | 94.2% | 0.7% | 569 |
| 2pm–3pm | 82.8% | 1.5% | 724 |
| 7pm–8pm | 75.3% | 6.0% | 83 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CHS to IAD
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 | 27 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 82.9% | -5.4 pts | 0.0% | 70 |
| Summer peak (Jun 15 - Aug 15) | 87.2% | -1.0 pts | 2.0% | 249 |
| All other days | 88.2% | — | 1.4% | 1,167 |
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).