Washington (IAD) to Charleston (CHS): On-Time Performance
Data through May 2026
Washington (IAD) to Charleston (CHS) effectively runs on two schedules. In October 2024, 97% of arrivals were on time; in December 2025 that fell to 75% — a 22-point seasonal swing. Across the full period the route averages 89% on-time against a national 78%. Morning departures also hold up better than evening ones (93% vs 70%), which matters most in the rough months.
- On-time
- 89%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 2.1
- last 12 months
- Duration
- 1h 51m
- scheduled
- Distance
- 442 mi
Best airline from IAD to CHS
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 91% | 8 min | 0.8% | 777 |
| Republic Airways | 86% | 9 min | 2.0% | 739 |
Monthly on-time trend
Best time to fly from IAD to CHS
Aim for departures around 8 a.m. (93% on-time); avoid 5 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 88% | 7 min |
| Tuesday | 90% | 6 min |
| Wednesdaybest | 92% | 6 min |
| Thursday | 89% | 8 min |
| Friday | 85% | 10 min |
| Saturday | 88% | 11 min |
| Sunday | 88% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations36%
- National airspace system20%
- Weather4%
Frequently asked questions
- How often are flights from IAD to CHS delayed?
- 11% of IAD–CHS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 8 minutes.
- Which airline is most reliable from IAD to CHS?
- United Airlines has the best on-time record on this route at 91%, based on 777 flights. 2 airlines flew IAD–CHS frequently enough to compare in this period.
- What is the best time of day to fly from IAD to CHS?
- Departures around 8 a.m. have the best record (93% on-time), while departures around 5 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to CHS?
- The scheduled IAD–CHS flight time averages 1h 51m over 442 miles. Actual arrival times vary — flights on this route land 15+ minutes late 11% of the time.
- How often are IAD to CHS flights cancelled?
- 1.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from IAD to CHS?
- December 2025 was the roughest month in this dataset, with only 75% of arrivals on time. The best was October 2024 at 97%. If your dates are flexible, that 22-point gap is worth planning around.
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Based on 1,516 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.