Route on-time record
CMH to IAD: most on-time flights and the best time to fly
Columbus (John Glenn Columbus International Airport) to Dulles (Washington Dulles International Airport). 1,129 nonstop flights in Jun 2025 to May 2026, 84% arrived within 15 minutes and 1.6% were cancelled. The most reliable flight number was Republic 3430 at 6:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
CMH → IAD
Columbus to Dulles: 1,129 nonstop flights a year
On time (12 months)
84%
Cancelled
1.6%
avg delay 14 min
Best time to leave
Before 9 AM
95% on time vs 65% 3 to 6 PM
Most reliable airline
Republic
84% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Republic 3430 · sold as American Eagle, Delta Connection or United Express
6:00 AM → 7:32 AM1h 22m nonstop
Local times, typical schedule. Last flown 2026-05-20.
93%
chance on time
- On time (history)
- 95%
- Cancelled
- 1.1%
- Avg arrival delay
- 3 min
- Arrived on time 95% of the time (347 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 3 to 6 PM: 65%).
Strong track record · 347 flights
Find 6:00 AM flight fares Opens this date on Aviasales#2 · United 445
10:41 AM → 11:55 AM1h 14m nonstop
Local times, typical schedule. Last flown 2026-05-20.
85%
chance on time
- On time (history)
- 90%
- Cancelled
- 1.9%
- Avg arrival delay
- 6 min
- Arrived on time 90% of the time (51 flights, Jun 2025 to May 2026).
- Short track record (51 flights), so its score leans on the airline's record at this hour.
Limited track record · 51 flights
Find United 445 fares Opens this date on Aviasales#3 · United 1689
10:34 AM → 11:53 AM1h 19m nonstop
Local times, typical schedule. Last flown 2026-03-28.
83%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 65 min
- Arrived on time 83% of the time (24 flights, Jun 2025 to May 2026).
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 1689 fares Opens this date on Aviasales#4 · Republic 3546 · sold as American Eagle, Delta Connection or United Express
8:04 PM → 9:25 PM1h 21m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 75%
- Cancelled
- 4.6%
- Avg arrival delay
- 29 min
- Arrived on time 75% of the time (146 flights, Jun 2025 to May 2026).
- Cancelled 4.6% of the time (7 of 153).
- 66% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 146 flights
Find 8:04 PM flight fares Opens this date on Aviasales#5 · United 529
7:40 PM → 9:04 PM1h 24m nonstop
Local times, typical schedule. Last flown 2026-04-29.
75%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 82% of the time (28 flights, Jun 2025 to May 2026).
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find United 529 fares Opens this date on Aviasales#6 · United 1403
7:47 PM → 9:11 PM1h 24m nonstop
Local times, typical schedule. Last flown 2026-05-20.
72%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 38 min
- Arrived on time 67% of the time (18 flights, Jun 2025 to May 2026).
- 60% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find United 1403 fares Opens this date on Aviasales#7 · United 341
3:08 PM → 4:30 PM1h 22m nonstop
Local times, typical schedule. Last flown 2026-03-27.
65%
chance on time
- On time (history)
- 59%
- Cancelled
- 0.0%
- Avg arrival delay
- 64 min
- Arrived on time 59% of the time (17 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 65% on time; Before 9 AM: 95%).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find United 341 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Republic Airways (sold as American Eagle, Delta Connection or United Express)84%
716 flights · 86% on time as flown · 2.0% cancel
- United Airlines79%
413 flights · 80% on time as flown · 1.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
354 flights · avg delay 3 min
- 9 AM to noon88%
223 flights · avg delay 14 min
- Noon to 3 PM80%
108 flights · avg delay 13 min
- 3 to 6 PM65%
142 flights · avg delay 24 min
- 6 to 9 PM79%
302 flights · avg delay 22 min
Best day: Saturday (90%). Worst: Friday (86%).
Smarter routing
Nearby airports that run more on time
CMH → BWI 86% chance on time
John Glenn Columbus International Airport to Baltimore/Washington International Thurgood Marshall Airport · 1,055 flights a year · 45 mi from your airports · yours: 82%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft44%
- Airline (crew, maintenance, boarding)36%
- Air traffic control and airport volume17%
- Severe weather4%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
CMH to IAD questions
- What time of day is best to fly CMH to IAD?
- Before 9 AM: 95% of flights arrived on time, against 65% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from CMH to IAD?
- Republic, with a season-adjusted 84% chance of operating and arriving on time over 716 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on CMH to IAD?
- January (83% on time); the best was November (93%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from CMH
- IAD to CMH (return)
- CMH to ORD 74%
- CMH to ATL 86%
- CMH to LGA 78%
- CMH to MCO 78%
- CMH to DCA 68%
- CMH to CLT 83%
- CMH to BOS 81%
- CMH to EWR 82%
- CMH to DEN 78%
- CMH to DFW 78%
- CMH to JFK 83%
- CMH to DTW 85%
Live status: FAA delays and ground stops