Route on-time record
STL to MIA: most on-time flights and the best time to fly
St Louis (St. Louis Lambert International Airport) to Miami (Miami International Airport). 1,123 nonstop flights in Jun 2025 to May 2026, 84% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was American 1716 at 5:24 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
STL → MIA
St Louis to Miami: 1,123 nonstop flights a year
On time (12 months)
84%
Cancelled
0.8%
avg delay 11 min
Best time to leave
Before 9 AM
89% on time vs 72% 3 to 6 PM
Most reliable airline
American
87% 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 · American 1716
5:24 AM → 9:15 AM2h 51m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 91% of the time (208 flights, Jun 2025 to May 2026).
- Never cancelled in 209 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 72%).
Strong track record · 208 flights
Find American 1716 fares Opens this date on Aviasales#2 · American 3175
11:06 AM → 2:57 PM2h 51m nonstop
Local times, typical schedule. Last flown 2026-05-20.
89%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 92% of the time (37 flights, Jun 2025 to May 2026).
- Never cancelled in 37 scheduled flights.
- Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
- 80% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 37 flights
Find American 3175 fares Opens this date on Aviasales#3 · Envoy 3954 · sold as American Eagle
11:04 AM → 2:50 PM2h 46m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
- Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 11 flights
Find 11:04 AM flight fares Opens this date on Aviasales#4 · Southwest 3387
10:30 AM → 2:10 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-30.
77%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
- Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 8 flights
Find Southwest 3387 fares Opens this date on Aviasales#5 · Southwest 1776
1:10 PM → 4:50 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 83% of the time (24 flights, Jun 2025 to May 2026).
- Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 24 flights
Find Southwest 1776 fares Opens this date on Aviasales#6 · Southwest 1095
1:50 PM → 5:30 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-29.
73%
chance on time
- On time (history)
- 74%
- Cancelled
- 0.0%
- Avg arrival delay
- 20 min
- Arrived on time 74% of the time (23 flights, Jun 2025 to May 2026).
- Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
- 71% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 23 flights
Find Southwest 1095 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- American Airlines87%
590 flights · 89% on time as flown · 1.1% cancel
- Envoy Air (sold as American Eagle)83%
87 flights · 82% on time as flown · 0.5% cancel
- Southwest Airlines78%
442 flights · 78% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM89%
508 flights · avg delay 6 min
- 9 AM to noon86%
216 flights · avg delay 9 min
- Noon to 3 PM79%
144 flights · avg delay 14 min
- 3 to 6 PM72%
82 flights · avg delay 13 min
- 6 to 9 PM75%
173 flights · avg delay 24 min
Best day: Wednesday (88%). Worst: Saturday (72%).
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 aircraft40%
- Airline (crew, maintenance, boarding)32%
- Air traffic control and airport volume25%
- Severe weather3%
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
STL to MIA questions
- What time of day is best to fly STL to MIA?
- Before 9 AM: 89% of flights arrived on time, against 72% 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 STL to MIA?
- American, with a season-adjusted 87% chance of operating and arriving on time over 590 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 STL to MIA?
- March (75% on time); the best was November (89%), 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 STL
- MIA to STL (return)
- STL to ATL 85%
- STL to DEN 75%
- STL to ORD 71%
- STL to LGA 75%
- STL to MCO 78%
- STL to DCA 73%
- STL to DFW 74%
- STL to PHX 76%
- STL to LAS 79%
- STL to DAL 77%
- STL to DTW 83%
- STL to MSP 80%
Most on-time flights from STL on every route →
Live status: FAA delays and ground stops