Route on-time record
IAD to CMH: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to Columbus (John Glenn Columbus International Airport). 1,129 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was United 1548 at 8:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → CMH
Dulles to Columbus: 1,129 nonstop flights a year
On time (12 months)
80%
Cancelled
1.4%
avg delay 16 min
Best time to leave
Before 9 AM
91% on time vs 70% 3 to 6 PM
Most reliable airline
United
84% chance on time
Lowest nonstop fare seen in the next two months: $99 (United 4291 on 2026-11-03). 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 · United 1548
8:15 AM → 9:40 AM1h 25m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1252; its record covers all of them.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 91% of the time (76 flights, Jun 2025 to May 2026).
- Never cancelled in 76 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 70%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Moderate track record · 76 flights
Find United 1548 fares Opens this date on Aviasales#2 · United 1581
12:52 PM → 2:12 PM1h 20m nonstop
Local times, typical schedule. Last flown 2026-03-27.
84%
chance on time
- On time (history)
- 71%
- Cancelled
- 0.0%
- Avg arrival delay
- 26 min
- Arrived on time 71% of the time (17 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Short track record (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find United 1581 fares Opens this date on Aviasales#3 · United 2165
5:13 PM → 6:44 PM1h 31m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 2344; its record covers all of them.
81%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 87% of the time (46 flights, Jun 2025 to May 2026).
- Never cancelled in 46 scheduled flights.
- Leaves in this route's least on-time window (3 to 6 PM: 70% on time; Before 9 AM: 91%).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 46 flights
Find United 2165 fares Opens this date on Aviasales#4 · Republic 3646 · sold as American Eagle, Delta Connection or United Express
10:10 PM → 11:44 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-20.
78%
chance on time
- On time (history)
- 81%
- Cancelled
- 2.9%
- Avg arrival delay
- 19 min
- Arrived on time 81% of the time (340 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- 60% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 340 flights
Find 10:10 PM flight fares Opens this date on Aviasales#5 · Republic 3566 · sold as American Eagle, Delta Connection or United Express
5:51 PM → 7:23 PM1h 32m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 65%
- Cancelled
- 2.0%
- Avg arrival delay
- 33 min
- Arrived on time 65% of the time (150 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 70% on time; Before 9 AM: 91%).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 150 flights
Find 5:51 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines84%
414 flights · 86% on time as flown · 0.6% cancel
- Republic Airways (sold as American Eagle, Delta Connection or United Express)77%
715 flights · 77% on time as flown · 2.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
224 flights · avg delay 6 min
- Noon to 3 PM87%
202 flights · avg delay 7 min
- 3 to 6 PM70%
350 flights · avg delay 24 min
- After 9 PM81%
353 flights · avg delay 19 min
Best day: Tuesday (86%). Worst: Sunday (81%).
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 aircraft46%
- Airline (crew, maintenance, boarding)32%
- Air traffic control and airport volume16%
- Severe weather5%
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
IAD to CMH questions
- What time of day is best to fly IAD to CMH?
- Before 9 AM: 91% of flights arrived on time, against 70% 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 IAD to CMH?
- United, with a season-adjusted 84% chance of operating and arriving on time over 414 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 IAD to CMH?
- June (75% on time); the best was November (92%), 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 IAD
- CMH to IAD (return)
- IAD to ATL 78%
- IAD to DEN 81%
- IAD to SFO 79%
- IAD to LAX 80%
- IAD to MCO 81%
- IAD to CLT 83%
- IAD to ORD 75%
- IAD to SEA 76%
- IAD to DFW 77%
- IAD to IAH 83%
- IAD to BOS 75%
- IAD to EWR 73%
Live status: FAA delays and ground stops