Route on-time record

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

Miami (Miami International Airport) to Atlanta (Hartsfield Jackson Atlanta International Airport). 6,240 nonstop flights in Jun 2025 to May 2026, 73% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was Delta 1249 at 6:00 AM.

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

MIA → ATL

Miami to Atlanta: 6,240 nonstop flights a year

On time (12 months)

73%

Cancelled

1.5%

avg delay 24 min

Best time to leave

Before 9 AM

89% on time vs 58% 6 to 9 PM

Most reliable airline

Envoy

75% chance on time

Check MIA to ATL fares

Lowest nonstop fare seen in the next two months: $36 (Frontier 2271 on 2026-11-04). 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 · Delta 1249
6:00 AM → 8:07 AM2h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
On time (history)
92%
Cancelled
2.2%
Avg arrival delay
9 min
- Arrived on time 92% of the time (267 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 58%).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
Strong track record · 267 flights
Find Delta 1249 fares Opens this date on Aviasales
#2 · Delta 1211
7:05 AM → 9:10 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
On time (history)
92%
Cancelled
1.7%
Avg arrival delay
8 min
- Arrived on time 92% of the time (344 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 58%).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
Strong track record · 344 flights
Find Delta 1211 fares Opens this date on Aviasales
#3 · Delta 1261
8:05 AM → 10:15 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
On time (history)
90%
Cancelled
1.1%
Avg arrival delay
14 min
- Arrived on time 90% of the time (361 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 58%).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
Strong track record · 361 flights
Find Delta 1261 fares Opens this date on Aviasales
#4 · American 1799
8:00 AM → 10:04 AM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-20.
87%
chance on time
On time (history)
95%
Cancelled
0.0%
Avg arrival delay
11 min
- Arrived on time 95% of the time (38 flights, Jun 2025 to May 2026).
- Never cancelled in 38 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 58%).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
Limited track record · 38 flights
Find American 1799 fares Opens this date on Aviasales
#5 · American 512
7:40 AM → 9:41 AM2h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
91%
Cancelled
0.0%
Avg arrival delay
9 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 58%).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
- 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
#6 · American 1191
7:15 AM → 9:20 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-04-06.
83%
chance on time
On time (history)
86%
Cancelled
3.3%
Avg arrival delay
7 min
- Arrived on time 86% 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: 89% on time; 6 to 9 PM: 58%).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
Limited track record · 29 flights
Find American 1191 fares Opens this date on Aviasales
#7 · Delta 2836
10:26 AM → 12:35 PM2h 09m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
On time (history)
83%
Cancelled
1.4%
Avg arrival delay
17 min
- Arrived on time 83% of the time (351 flights, Jun 2025 to May 2026).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
Strong track record · 351 flights
Find Delta 2836 fares Opens this date on Aviasales
#8 · Envoy 4179 · sold as American Eagle
1:58 PM → 4:08 PM2h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06.
82%
chance on time
On time (history)
88%
Cancelled
3.8%
Avg arrival delay
6 min
- Arrived on time 88% of the time (25 flights, Jun 2025 to May 2026).
- Departs inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (25 flights), so its score leans on the airline's record at this hour.
Limited track record · 25 flights
Find 1:58 PM flight fares Opens this date on Aviasales
#9 · Frontier 2483
5:05 AM → 7:19 AM2h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
On time (history)
82%
Cancelled
1.7%
Avg arrival delay
9 min
- Arrived on time 82% of the time (295 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 58%).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
Strong track record · 295 flights
Find Frontier 2483 fares Opens this date on Aviasales
#10 · Spirit 1683
12:53 PM → 2:51 PM1h 58m nonstop
Local times, typical schedule. Last flown 2026-05-01.
77%
chance on time
On time (history)
92%
Cancelled
0.0%
Avg arrival delay
16 min
- Arrived on time 92% of the time (12 flights, Jun 2025 to May 2026).
- Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- 79% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 12 flights
Find Spirit 1683 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

Envoy Air (sold as American Eagle)75%
228 flights · 78% on time as flown · 1.4% cancel
Delta Air Lines74%
3,313 flights · 75% on time as flown · 1.5% cancel
Spirit Airlines71%
287 flights · 74% on time as flown · 3.0% cancel
Frontier Airlines70%
823 flights · 71% on time as flown · 1.8% cancel
Republic Airways (sold as American Eagle, Delta Connection or United Express)68%
44 flights · 66% on time as flown · 1.2% cancel
American Airlines67%
1,545 flights · 67% on time as flown · 1.1% cancel

On time by departure time

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

Before 9 AM89%
1,757 flights · avg delay 10 min
9 AM to noon81%
601 flights · avg delay 19 min
Noon to 3 PM74%
1,069 flights · avg delay 23 min
3 to 6 PM61%
1,225 flights · avg delay 33 min
6 to 9 PM58%
1,089 flights · avg delay 34 min
After 9 PM63%
499 flights · avg delay 33 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

Airline (crew, maintenance, boarding)39%
Late-arriving aircraft37%
Air traffic control and airport volume19%
Severe weather4%

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

MIA to ATL questions

What time of day is best to fly MIA to ATL?: Before 9 AM: 89% of flights arrived on time, against 58% 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 MIA to ATL?: Envoy, with a season-adjusted 75% chance of operating and arriving on time over 228 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 MIA to ATL?: July (59% on time); the best was October (82%), 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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