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Route on-time record

IAD to CVG: most on-time flights and the best time to fly

Dulles (Washington Dulles International Airport) to Cincinnati / Covington (Cincinnati Northern Kentucky International Airport). 536 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was Republic 3521 at 10:17 PM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

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IAD → CVG

Dulles to Cincinnati / Covington: 536 nonstop flights a year

On time (12 months)

82%

Cancelled

0.9%

avg delay 13 min

Best time to leave

Before 9 AM

87% on time vs 78% noon to 3 PM

Most reliable airline

Republic

81% chance on time

Check IAD to CVG fares

Lowest nonstop fare seen in the next two months: $330 (United 4544 on 2026-10-30). 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. #1 · Republic 3521 · sold as American Eagle, Delta Connection or United Express

    10:17 PM → 11:59 PM1h 42m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Republic 3671; its record covers all of them.

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    1.5%
    Avg arrival delay
    15 min
    • Arrived on time 84% of the time (64 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).

    Moderate track record · 64 flights

    Find 10:17 PM flight 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)81%

    518 flights · 82% on time as flown · 1.0% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM87%

    172 flights · avg delay 9 min

  • Noon to 3 PM78%

    61 flights · avg delay 13 min

  • 3 to 6 PM80%

    164 flights · avg delay 13 min

  • After 9 PM79%

    139 flights · avg delay 20 min

Best day: Wednesday (91%). Worst: Sunday (83%).

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.

J
82
F
90
M
85
A
92
M
87
J
82
J
85
A
84
S
95
O
87
N
84
D
84

What delays this route

  • Airline (crew, maintenance, boarding)51%
  • Late-arriving aircraft35%
  • Air traffic control and airport volume14%

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

Finding the most reliable connections from IAD to CVG…

IAD to CVG questions

What time of day is best to fly IAD to CVG?
Before 9 AM: 87% of flights arrived on time, against 78% for departures noon to 3 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 CVG?
Republic, with a season-adjusted 81% chance of operating and arriving on time over 518 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 CVG?
June (82% on time); the best was September (95%), 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

Live status: FAA delays and ground stops