Route on-time record
IAD to MIA: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to Miami (Miami International Airport). 668 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was United 1073 at 8:35 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → MIA
Dulles to Miami: 668 nonstop flights a year
On time (12 months)
79%
Cancelled
1.0%
avg delay 18 min
Best time to leave
Before 9 AM
86% on time vs 49% 6 to 9 PM
Most reliable airline
United
84% chance on time
Lowest nonstop fare seen in the next two months: $49 (Frontier 3731 on 2026-11-22). 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 1073
8:35 AM → 11:31 AM2h 56m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.6%
- Avg arrival delay
- 11 min
- Arrived on time 84% of the time (325 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 49%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Strong track record · 325 flights
Find United 1073 fares Opens this date on Aviasales#2 · United 1214
1:20 PM → 4:16 PM2h 56m nonstop
Local times, typical schedule. Last flown 2026-05-20.
83%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 16 min
- Arrived on time 84% of the time (76 flights, Jun 2025 to May 2026).
- Never cancelled in 76 scheduled flights.
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 76 flights
Find United 1214 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines84%
512 flights · 85% on time as flown · 0.7% cancel
- Frontier Airlines66%
156 flights · 61% on time as flown · 1.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM86%
304 flights · avg delay 9 min
- 9 AM to noon83%
60 flights · avg delay 16 min
- Noon to 3 PM82%
154 flights · avg delay 15 min
- 3 to 6 PM74%
69 flights · avg delay 33 min
- 6 to 9 PM49%
41 flights · avg delay 58 min
- After 9 PM57%
40 flights · avg delay 27 min
Best day: Tuesday (85%). Worst: Sunday (77%).
Smarter routing
Nearby airports that run more on time
IAD → FLL 83% chance on time
Washington Dulles International Airport to Fort Lauderdale Hollywood International Airport · 742 flights a year · 21 mi from your airports · yours: 79%
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 aircraft50%
- Air traffic control and airport volume31%
- Airline (crew, maintenance, boarding)18%
- Severe weather1%
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 MIA questions
- What time of day is best to fly IAD to MIA?
- Before 9 AM: 86% of flights arrived on time, against 49% for departures 6 to 9 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 MIA?
- United, with a season-adjusted 84% chance of operating and arriving on time over 512 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 MIA?
- July (69% on time); the best was September (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 IAD
- MIA 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