IAD to CMH flight delays & on-time performance
Nonstop flights from Washington Dulles International Airport to John Glenn Columbus International Airport · 299 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAD or CMH right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Washington (IAD) to Columbus (CMH) arrived on time 83% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.9% were cancelled, and 6% arrived an hour or more late.
- United Airlines was the most punctual airline here (85% on time); Republic Airways was the least (82%).
- Departures scheduled around 8am did best (90% on time); around 5pm did worst (79%).
- Tuesday was the most reliable day to fly (88% on time) and Sunday the least (79%).
- The largest source of delay minutes was late-arriving aircraft (44%).
Which airline is most on time from IAD to CMH?
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 |
|---|---|---|---|---|---|
| United Airlines | 85% | 0.3% | 10 min | 4.4% | 389 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 82% | 1.4% | 14 min | 7.0% | 591 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am90%199 flights
- 12pm88%193 flights
- 3pm55%22 flights
- 5pm79%246 flights
- 10pm82%320 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday79%2.0% cancelled
- Tuesday88%0.0% cancelled
- Wednesday85%0.0% cancelled
- Thursday86%0.0% cancelled
- Friday81%0.7% cancelled
- Saturday88%1.0% cancelled
- Sunday79%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 aircraft44%
- Airline (crew, maintenance, cleaning, fueling)37%
- Air traffic control & airport congestion15%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather67%
- Air traffic control & airport congestion33%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
IAD to CMH: common questions
- How often are IAD to CMH flights on time?
- 83% 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 Washington to Columbus cancelled?
- 0.9% of scheduled flights were cancelled (9 of 980).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 71 min behind schedule on average, and 6.0% of flights were an hour or more late.
- How long is taxi time at IAD?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: CMH to IAD — 85% on time
More flights from Washington
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAD → CMH, nonstop flights by US airlines that report to the DOT. How we calculate this.