Washington (IAD) to Columbus (CMH): On-Time Performance
Data through July 2026
When you fly IAD to CMH matters as much as anything else about the booking: the route swung from 97% on-time in April 2026 to just 63% in June 2025. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 79%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 2.7
- last 12 months
- Duration
- 1h 26m
- scheduled
- Distance
- 299 mi
Best airline from IAD to CMH
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 87% | 9 min | 0.4% | 463 |
| Republic Airways | 80% | 16 min | 1.7% | 1,583 |
Monthly on-time trend
Best time to fly from IAD to CMH
Aim for departures around 8 a.m. (92% on-time); avoid 4 p.m. departures (57%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 14 min |
| Tuesdaybest | 85% | 9 min |
| Wednesday | 83% | 13 min |
| Thursday | 83% | 18 min |
| Friday | 79% | 20 min |
| Saturday | 85% | 12 min |
| Sunday | 78% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft41%
- Airline operations34%
- National airspace system17%
- Weather8%
Frequently asked questions
- How often are flights from IAD to CMH delayed?
- 18% of IAD–CMH flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from IAD to CMH?
- United Airlines has the best on-time record on this route at 87%, based on 463 flights. 2 airlines flew IAD–CMH frequently enough to compare in this period.
- What is the best time of day to fly from IAD to CMH?
- Departures around 8 a.m. have the best record (92% on-time), while departures around 4 p.m. have the worst (57%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to CMH?
- The scheduled IAD–CMH flight time averages 1h 26m over 299 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are IAD to CMH flights cancelled?
- 1.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from IAD to CMH?
- June 2025 was the roughest month in this dataset, with only 63% of arrivals on time. The best was April 2026 at 97%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 2,046 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.