ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
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%
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