Columbus (CMH) to Washington (IAD): On-Time Performance
Data through May 2026
When you fly CMH to IAD matters as much as anything else about the booking: the route swung from 97% on-time in October 2024 to just 69% in January 2025. Across the full period the route averages 85% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 81%), which matters most in the rough months.
- On-time
- 85%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 3.1
- last 12 months
- Duration
- 1h 22m
- scheduled
- Distance
- 299 mi
Best airline from CMH to IAD
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airwaysmost reliable | 86% | 9 min | 1.6% | 1,595 |
| United Airlines | 82% | 16 min | 0.9% | 461 |
Monthly on-time trend
Best time to fly from CMH to IAD
Aim for departures around 6 a.m. (93% on-time); avoid 3 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 12 min |
| Tuesday | 87% | 7 min |
| Wednesday | 85% | 11 min |
| Thursday | 86% | 11 min |
| Friday | 83% | 16 min |
| Saturdaybest | 91% | 5 min |
| Sunday | 84% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft42%
- Airline operations37%
- National airspace system18%
- Weather4%
Frequently asked questions
- How often are flights from CMH to IAD delayed?
- 15% of CMH–IAD 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 11 minutes.
- Which airline is most reliable from CMH to IAD?
- Republic Airways has the best on-time record on this route at 86%, based on 1,595 flights. 2 airlines flew CMH–IAD frequently enough to compare in this period.
- What is the best time of day to fly from CMH to IAD?
- Departures around 6 a.m. have the best record (93% on-time), while departures around 3 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 CMH to IAD?
- The scheduled CMH–IAD flight time averages 1h 22m over 299 miles. Actual arrival times vary — flights on this route land 15+ minutes late 15% of the time.
- How often are CMH to IAD 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 CMH to IAD?
- January 2025 was the roughest month in this dataset, with only 69% of arrivals on time. The best was October 2024 at 97%. If your dates are flexible, that 28-point gap is worth planning around.
Explore related pages
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Based on 2,056 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.