Route on-time record
DAY to DEN: most on-time flights and the best time to fly
Dayton (James M. Cox Dayton International Airport) to Denver (Denver International Airport). 365 nonstop flights in Jun 2025 to May 2026, 91% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 1235 at 9:10 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
DAY → DEN
Dayton to Denver: 365 nonstop flights a year
On time (12 months)
91%
Cancelled
0.8%
avg delay 7 min
Best time to leave
No clear winner
Most reliable airline
United
90% 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 · United 1235
9:10 AM → 10:30 AM3h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
95%
chance on time
- On time (history)
- 98%
- Cancelled
- 1.6%
- Avg arrival delay
- 1 min
- Arrived on time 98% of the time (63 flights, Jun 2025 to May 2026).
Moderate track record · 63 flights
Find United 1235 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines90%
282 flights · 91% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
138 flights · avg delay 11 min
- 9 AM to noon92%
227 flights · avg delay 5 min
Best day: Thursday (93%). Worst: Saturday (88%).
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
- Airline (crew, maintenance, boarding)47%
- Late-arriving aircraft29%
- Air traffic control and airport volume19%
- 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
DAY to DEN questions
- Which airline is most on time from DAY to DEN?
- United, with a season-adjusted 90% chance of operating and arriving on time over 282 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 DAY to DEN?
- January (82% on time); the best was September (97%), 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 DAY
- DEN to DAY (return)
- DAY to ORD 72%
- DAY to ATL 89%
- DAY to DFW 78%
- DAY to CLT 83%
- DAY to DCA 72%
- DAY to PHL 91%
Live status: FAA delays and ground stops