CMH to IAD flight delays & on-time performance
Nonstop flights from John Glenn Columbus International Airport to Washington Dulles International Airport · 299 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at CMH or IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Columbus (CMH) to Washington (IAD) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.9% were cancelled, and 5% arrived an hour or more late.
- Republic Airways was the most punctual airline here (89% on time); United Airlines was the least (80%).
- Departures scheduled around 6am did best (94% on time); around 3pm did worst (67%).
- Saturday was the most reliable day to fly (94% on time) and Monday the least (75%).
- The largest source of delay minutes was late-arriving aircraft (41%).
Which airline is most on time from CMH to IAD?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 89% | 1.0% | 7 min | 3.4% | 591 |
| United Airlines | 80% | 0.8% | 18 min | 7.0% | 388 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am94%320 flights
- 10am87%198 flights
- 1pm100%22 flights
- 2pm74%78 flights
- 3pm67%115 flights
- 7pm84%152 flights
- 8pm80%93 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday75%0.7% cancelled
- Tuesday86%1.4% cancelled
- Wednesday90%0.7% cancelled
- Thursday90%0.0% cancelled
- Friday84%0.7% cancelled
- Saturday94%0.0% cancelled
- Sunday81%2.8% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft41%
- Airline (crew, maintenance, cleaning, fueling)40%
- Air traffic control & airport congestion18%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather56%
- Airline (crew, maintenance, cleaning, fueling)22%
- Air traffic control & airport congestion22%
- Security0%
CMH to IAD: common questions
- How often are CMH to IAD flights on time?
- 85% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Columbus to Washington cancelled?
- 0.9% of scheduled flights were cancelled (9 of 979).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 72 min behind schedule on average, and 4.8% of flights were an hour or more late.
- How long is taxi time at CMH?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAD to CMH — 83% on time
More flights from Columbus
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: CMH → IAD, nonstop flights by US airlines that report to the DOT. How we calculate this.