Route on-time record

ATL to MIA: most on-time flights and the best time to fly

Atlanta (Hartsfield Jackson Atlanta International Airport) to Miami (Miami International Airport). 6,245 nonstop flights in Jun 2025 to May 2026, 70% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was American 3150 at 6:15 AM.

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

ATL → MIA

Atlanta to Miami: 6,245 nonstop flights a year

On time (12 months)

70%

Cancelled

1.5%

avg delay 23 min

Best time to leave

Before 9 AM

85% on time vs 57% 3 to 6 PM

Most reliable airline

American

74% chance on time

Check ATL to MIA fares

Lowest nonstop fare seen in the next two months: $30 (Frontier 2272 on 2026-10-20). 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 3150
6:15 AM → 8:14 AM1h 59m nonstop
Local times, typical schedule. Last flown 2026-05-20.
91%
chance on time
On time (history)
98%
Cancelled
0.0%
Avg arrival delay
1 min
- Arrived on time 98% of the time (44 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 3 to 6 PM: 57%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Limited track record · 44 flights
Find American 3150 fares Opens this date on Aviasales
#2 · American 1421
5:09 AM → 7:09 AM2h 00m nonstop
Local times, typical schedule. Last flown 2026-04-06.
89%
chance on time
On time (history)
93%
Cancelled
3.3%
Avg arrival delay
8 min
- Arrived on time 93% of the time (29 flights, Jun 2025 to May 2026).
- Cancelled 3.3% of the time (1 of 30).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 3 to 6 PM: 57%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Limited track record · 29 flights
Find American 1421 fares Opens this date on Aviasales
#3 · Delta 2836
7:25 AM → 9:20 AM1h 52m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
On time (history)
87%
Cancelled
1.8%
Avg arrival delay
7 min
- Arrived on time 87% of the time (331 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 3 to 6 PM: 57%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 331 flights
Find Delta 2836 fares Opens this date on Aviasales
#4 · American 1799
11:00 AM → 1:01 PM2h 01m nonstop
Local times, typical schedule. Last flown 2026-05-20.
84%
chance on time
On time (history)
89%
Cancelled
0.0%
Avg arrival delay
12 min
- Arrived on time 89% of the time (38 flights, Jun 2025 to May 2026).
- Never cancelled in 38 scheduled flights.
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- 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 · 38 flights
Find American 1799 fares Opens this date on Aviasales
#5 · American 1046
6:34 AM → 8:35 AM2h 01m nonstop
Local times, typical schedule. Last flown 2026-04-06.
83%
chance on time
On time (history)
84%
Cancelled
1.2%
Avg arrival delay
15 min
- Arrived on time 84% of the time (237 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 3 to 6 PM: 57%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- 61% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 237 flights
Find American 1046 fares Opens this date on Aviasales
#6 · American 2526
9:00 AM → 11:07 AM2h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
85%
Cancelled
0.6%
Avg arrival delay
12 min
- Arrived on time 85% of the time (159 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Moderate track record · 159 flights
Find American 2526 fares Opens this date on Aviasales
#7 · American 3190
8:00 AM → 9:59 AM1h 59m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
83%
Cancelled
0.5%
Avg arrival delay
20 min
- Arrived on time 83% of the time (181 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 3 to 6 PM: 57%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Moderate track record · 181 flights
Find American 3190 fares Opens this date on Aviasales
#8 · Spirit 1682
7:00 AM → 8:55 AM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-01.
81%
chance on time
On time (history)
83%
Cancelled
0.0%
Avg arrival delay
15 min
- Arrived on time 83% of the time (12 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 3 to 6 PM: 57%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- Short track record (12 flights), so its score leans on the airline's record at this hour.
Limited track record · 12 flights
Find Spirit 1682 fares Opens this date on Aviasales
#9 · American 512
10:37 AM → 12:38 PM2h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
On time (history)
82%
Cancelled
0.0%
Avg arrival delay
10 min
- Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- 64% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find American 512 fares Opens this date on Aviasales
#10 · Delta 1510
8:55 AM → 10:46 AM1h 58m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
80%
Cancelled
1.6%
Avg arrival delay
10 min
- Arrived on time 80% of the time (358 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 3 to 6 PM: 57%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 358 flights
Find Delta 1510 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

American Airlines74%
1,547 flights · 75% on time as flown · 1.1% cancel
Envoy Air (sold as American Eagle)71%
230 flights · 75% on time as flown · 1.4% cancel
Spirit Airlines69%
287 flights · 72% on time as flown · 3.0% cancel
Delta Air Lines67%
3,311 flights · 68% on time as flown · 1.5% cancel
Republic Airways (sold as American Eagle, Delta Connection or United Express)65%
44 flights · 64% on time as flown · 1.2% cancel
Frontier Airlines63%
826 flights · 64% on time as flown · 1.7% cancel

On time by departure time

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

Before 9 AM85%
1,373 flights · avg delay 13 min
9 AM to noon77%
1,396 flights · avg delay 15 min
Noon to 3 PM68%
849 flights · avg delay 22 min
3 to 6 PM57%
945 flights · avg delay 31 min
6 to 9 PM58%
1,091 flights · avg delay 36 min
After 9 PM62%
591 flights · avg delay 30 min

Best day: Tuesday (77%). Worst: Sunday (64%).

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 aircraft38%
Airline (crew, maintenance, boarding)36%
Air traffic control and airport volume21%
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

ATL to MIA questions

What time of day is best to fly ATL to MIA?: Before 9 AM: 85% of flights arrived on time, against 57% 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 ATL to MIA?: American, with a season-adjusted 74% chance of operating and arriving on time over 1,547 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 ATL to MIA?: July (58% on time); the best was October (83%), 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.

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Live status: FAA delays and ground stops

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