Best Time to Fly IAD to CHS: On-Time Stats by Hour & Airline
Washington Dulles International → Charleston AFB/International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 86.8% of Washington (IAD) to Charleston (CHS) flights arrived on time (760 scheduled flights). That is 9.2 points above the national average of 77.6%.
Among 2 airlines, United Airlines led with 89.1% on time and Republic Airways was last with 83.2%.
Over 24 months, Wednesday was the most reliable day (92% on time) and January the worst month (79%).
The cancellation rate was 1.1% (US average 1.8%).
IAD to CHS 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 | 89.1% | 84 min | 0.9% | 463 |
| Republic Airways | 83.2% | 63 min | 1.4% | 297 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to CHS
On-time arrival % by scheduled departure hour (local time), 1,516 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 92.7% | 0.8% | 646 |
| 12pm–1pm | 86.5% | 1.7% | 354 |
| 1pm–2pm | 89.4% | 1.6% | 366 |
| 2pm–3pm | Limited data | 4 | |
| 5pm–6pm | 64.8% | 4.3% | 92 |
| 10pm–11pm | 77.8% | 0.0% | 54 |
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 CHS
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) | 78.6% | -10.4 pts | 0.0% | 70 |
| Summer peak (Jun 15 - Aug 15) | 87.7% | -1.3 pts | 1.6% | 249 |
| All other days | 89.0% | — | 1.4% | 1,170 |
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).