Route profile
ATL→MIA
Flight reliability, delays and best times to fly from Atlanta to Miami, 594 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 15% of comparable major US routes (4,598 compared)
Calculated from 20,130 flights. How this is calculated
ATL → MIA arrives on time 71.5% of the time; the return trip, MIA → ATL, arrives on time 71.9% of the time.
ATL → MIA spends 28.2 minutes on the ground on a 594-mile trip: 18.1 minutes from pushback to wheels-up at ATL and 10.1 minutes from touchdown to gate at MIA.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
Which day you fly matters unusually much here, a wider weekday spread than 90% of 4,467 comparable routes.
77.8% on time on a typical Tuesday, against 64.2% on a Sunday.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,467 in the comparison.
Why ATL → MIA flights are cancelled
July 2023 – July 2026
ATL → MIA cancelled 260 of 20,130 scheduled flights — about 1 in every 77. The reason filed most often was extreme weather, 53.1% of the cancellations coded on this route — about 1 in every 146 scheduled flights.
Share of cancellations
Of 260 cancelled departures carrying a reason code.
What each reason means
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
138 cancellations, 53.1% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
114 cancellations, 43.8% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
8 cancellations, 3.1% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
260 coded cancellations were recorded on ATL → MIA; the section appears from 50.
When it goes wrong
July 2023 – July 2026
62 min late
against a median of 1 min early
ATL → MIA has an average that understates its risk: a typical arrival is 1 min early, but the worst tenth are 63 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 20,130 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at MIA after arriving from ATL.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 46% | Likely to miss |
| 45 min | 28% | High risk |
| 60 min | 19% | High risk |
| 90 min | 10% | Some risk |
| 120 min | 6.4% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.29% of the time and diverts 0.34% of the time, which a late arrival never shows up in.
Chance of missing is the share of 19,801 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 62 minutes late (90th-percentile gate arrival delay), over 20,130 operations.
Any other layover length: connection checker.
Best time to fly
ATL → MIA flights departing 5–9 AM arrived on time 83.9% of the time, against 59.7% for 3–6 PM departures, a gap of 24.2 percentage points.
By day and hour
On-time arrival rate for each weekday and scheduled departure hour, in local time at the departure airport (ATL).
Hour of departure matters more than day of the week: hourly averages sit a typical 9.6 points from the route-wide rate, weekday averages 4.4 points.
| Hour | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
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On-time rate, % · stronger color, fewer on time
- 40–49
- 50–59
- 60–69
- 70–79
- 80–89
- Fewer than 120 flights, not scored
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · On time is arrival within 15 minutes of schedule. Cells round to whole percentages; the table shows one decimal.
No slot is named best or worst: too few reach 500 flights. Departures before 7 AM and after 11 PM (1,524 flights) are not drawn: no slot in those hours has enough flights to score.
View as tableHide table
| Hour | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
|---|---|---|---|---|---|---|---|
| 7 AM–8 AM | 82.7% on time272 flights | 85.2% on time264 flights | 82.0% on time253 flights | 84.8% on time284 flights | 83.8% on time269 flights | 82.6% on time259 flights | 80.2% on time274 flights |
| 8 AM–9 AM | 79.9% on time181 flights | 84.7% on time158 flights | 84.9% on time174 flights | 83.1% on time180 flights | 80.1% on time184 flights | 70.7% on time194 flights | 78.9% on time197 flights |
| 9 AM–10 AM | 71.0% on time214 flights | 84.8% on time186 flights | 87.0% on time164 flights | 82.6% on time209 flights | 76.5% on time206 flights | 76.0% on time188 flights | 74.4% on time211 flights |
| 10 AM–11 AM | 72.5% on time152 flights | 77.4% on time160 flights | 82.1% on time159 flights | 81.0% on time153 flights | 78.9% on time144 flights | 71.5% on time154 flights | 72.2% on time179 flights |
| 11 AM–12 PM | 79.6% on time302 flights | 81.4% on time328 flights | 84.1% on time321 flights | 79.1% on time307 flights | 76.9% on time311 flights | 75.5% on time283 flights | 75.8% on time292 flights |
| 12 PM–1 PM | 89 flights, too few to score | 104 flights, too few to score | 99 flights, too few to score | 101 flights, too few to score | 95 flights, too few to score | 69.0% on time127 flights | 103 flights, too few to score |
| 1 PM–2 PM | 69.9% on time167 flights | 73.9% on time162 flights | 75.7% on time154 flights | 72.4% on time155 flights | 73.3% on time164 flights | 71.1% on time151 flights | 63.8% on time152 flights |
| 2 PM–3 PM | 118 flights, too few to score | 75.6% on time128 flights | 75.0% on time124 flights | 64.3% on time131 flights | 59.8% on time128 flights | 111 flights, too few to score | 116 flights, too few to score |
| 3 PM–4 PM | 60.6% on time135 flights | 71.3% on time138 flights | 67.4% on time146 flights | 66.7% on time135 flights | 68.0% on time129 flights | 60.6% on time134 flights | 45.0% on time143 flights |
| 4 PM–5 PM | 55.4% on time230 flights | 69.3% on time193 flights | 72.0% on time190 flights | 54.5% on time238 flights | 58.0% on time242 flights | 59.5% on time192 flights | 46.1% on time247 flights |
| 5 PM–6 PM | 74 flights, too few to score | 99 flights, too few to score | 108 flights, too few to score | 68 flights, too few to score | 71 flights, too few to score | 76 flights, too few to score | 67 flights, too few to score |
| 6 PM–7 PM | 65.2% on time194 flights | 73.6% on time163 flights | 74.5% on time155 flights | 58.5% on time193 flights | 66.3% on time187 flights | 62.4% on time222 flights | 56.4% on time186 flights |
| 7 PM–8 PM | 60.5% on time172 flights | 72.8% on time171 flights | 70.1% on time169 flights | 55.8% on time150 flights | 63.9% on time173 flights | 54.1% on time185 flights | 50.9% on time173 flights |
| 8 PM–9 PM | 62.6% on time158 flights | 66 flights, too few to score | 77 flights, too few to score | 55.3% on time171 flights | 53.1% on time162 flights | 71 flights, too few to score | 46.4% on time144 flights |
| 9 PM–10 PM | 68 flights, too few to score | 57 flights, too few to score | 61 flights, too few to score | 59 flights, too few to score | 72 flights, too few to score | 57 flights, too few to score | 58 flights, too few to score |
| 10 PM–11 PM | 64.4% on time195 flights | 78.5% on time160 flights | 70.5% on time173 flights | 70.4% on time209 flights | 57.6% on time207 flights | 63.3% on time171 flights | 57.6% on time217 flights |
By departure window
By departure hour
- 12 AM to 4 AM: too few flights to score
- 5 AM: 92.3% on time from 778 flights
- 6 AM: 83.3% on time from 413 flights
- 7 AM: 83.1% on time from 1,875 flights
- 8 AM: 80.1% on time from 1,268 flights
- 9 AM: 78.6% on time from 1,378 flights
- 10 AM: 76.4% on time from 1,101 flights
- 11 AM: 79.1% on time from 2,144 flights
- 12 PM: 72.6% on time from 718 flights
- 1 PM: 71.5% on time from 1,105 flights
- 2 PM: 67.3% on time from 856 flights
- 3 PM: 62.7% on time from 960 flights
- 4 PM: 58.5% on time from 1,532 flights
- 5 PM: 57.6% on time from 563 flights
- 6 PM: 64.8% on time from 1,300 flights
- 7 PM: 61.2% on time from 1,193 flights
- 8 PM: 58.8% on time from 849 flights
- 9 PM: 59.4% on time from 432 flights
- 10 PM: 65.6% on time from 1,332 flights
- 11 PM: 68.2% on time from 333 flights
Why ATL → MIA runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for ATL → MIA. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on ATL → MIA, at 38.2%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 83.9% of the time and 3–6 PM departures 59.7%.
How this route holds up in bad weather
July 2023 – July 2026
Bad weather raises cancellations by a similar amount at both ends of ATL to MIA: 3.3 times the normal rate at ATL and 3.3 times at MIA. Cancelled in bad weather against normal hours: ATL 3.4% against 1.0%, MIA 4.5% against 1.3%. Flights that did leave MIA in bad weather arrived on time 50.6% of the time, against 74.1% in normal hours.
Bad weather and normal hours at the airports
Scheduled departures, July 2023 – July 2026| Departures from | ATL | MIA |
|---|---|---|
| Cancelled in bad weather | 3.4% | 4.5% |
| Cancelled in normal hours | 1.0% | 1.3% |
| Arrived on time, bad weather | 66.5% | 50.6% |
| Arrived on time, normal hours | 80.2% | 74.1% |
| Departures in bad weather | 105,854 | 15,746 |
Of the carriers on this route, Southwest Airlines (2.1% cancelled against 3.1% for the other carriers at ATL) cancelled the fewest departures from ATL in bad weather and Frontier Airlines (5.0% cancelled against 3.8% for the other carriers at ATL) the most. One more carrier flies this route but has too few bad-weather departures from ATL to compare.
This route’s airlines in bad weather at ATL
All departures from ATL| Airline | Bad-weather departures | Cancelled | Other carriers |
|---|---|---|---|
| Southwest Airlines | 8,953 | 2.1%below the others | 3.1% |
| American Airlines | 2,658 | 2.4%below the others | 3.4% |
| Delta Air Lines | 73,919 | 3.5%about level | 3.6% |
| Spirit Airlines | 2,965 | 3.9%above the others | 3.2% |
| Frontier Airlines | 4,928 | 5.0%above the others | 3.8% |
These are airport figures, not route figures: every scheduled departure from ATL and MIA, to any destination, in hours the weather report called bad. The airline rows count each carrier’s departures from ATL on every route.
Weather source and limits. In full: ATL (airlines), MIA, What Weather Costs Each Airport, Who Cancels More When the Weather Turns, Airports That Change Places When Weather Turns.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Delta Air Lines | 9,992 | 71.0% | 1.17% | 0 min | 9.3% |
| American Airlines | 5,220 | 75.2% | 1.42% | -5 min | 10.8% |
| Frontier Airlines | 2,177 | 61.9% | 1.79% | 3 min | 17.5% |
| Southwest Airlines | 1,283 | 73.7% | 0.78% | 0 min | 7.2% |
| Spirit Airlines | 771 | 70.9% | 1.69% | -3 min | 11.9% |
| Envoy Air | 614 | 78.3% | 1.14% | -7 min | 6.4% |
Delta Air Lines flew 49.8% of the 20,057 flights listed. Frontier Airlines cancelled 1.79% of its flights here against 0.78% for Southwest Airlines.
Envoy Air arrived on time 16.4 percentage points more often than Frontier Airlines on this route.
Other ways to fly Atlanta to Miami
Airport pairs in the same two city markets, as the DOT defines them.
| Route | Flights | On time | Cancelled | Median delay | Score |
|---|---|---|---|---|---|
| ATL→FLL Atlanta to Fort Lauderdale | 22,817 | 72.0% | 1.52% | -1 min | 52 |
| ATL→MIA this route Atlanta to Miami | 20,130 | 71.5% | 1.29% | -1 min | 50 |
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| DL1510 Delta Air Lines | 9:00 AM | 1,127 | 81.3% |
| DL1323 Delta Air Lines | 1:45 PM | 1,054 | 67.6% |
| DL1588 Delta Air Lines | 6:58 PM | 1,047 | 65.5% |
| DL1332 Delta Air Lines | 11:00 AM | 1,016 | 78.9% |
| DL1589 Delta Air Lines | 11:00 PM | 926 | 70.3% |
| DL1386 Delta Air Lines | 3:10 PM | 892 | 60.8% |
| DL1579 Delta Air Lines | 12:52 PM | 716 | 74.1% |
| F93442 Frontier Airlines | 10:50 PM | 658 | 53.9% |
DL1510 (9:00 AM) arrived on time 81.3% of the time, 27.4 points more often than F93442 (10:50 PM) at 53.9%.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 13.6 percentage points.
By month
- Jan: 69.2%
- Feb: 77.0%
- Mar: 66.9%
- Apr: 74.6%
- May: 70.1%
- Jun: 66.8%
- Jul: 59.3%
- Aug: 67.0%
- Sep: 78.3%
- Oct: 83.0%
- Nov: 81.0%
- Dec: 70.3%
July is historically the weakest month and October the strongest, a spread of 23.7 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 56.4% from 577 flights
- August 2023: 64.7% from 559 flights
- September 2023: 73.3% from 544 flights
- October 2023: 81.5% from 516 flights
- November 2023: 86.2% from 552 flights
- December 2023: 72.1% from 656 flights
- January 2024: 67.8% from 634 flights
- February 2024: 80.7% from 564 flights
- March 2024: 65.5% from 624 flights
- April 2024: 73.6% from 590 flights
- May 2024: 67.0% from 590 flights
- June 2024: 63.2% from 526 flights
- July 2024: 59.4% from 520 flights
- August 2024: 68.7% from 512 flights
- September 2024: 82.2% from 502 flights
- October 2024: 87.9% from 534 flights
- November 2024: 83.7% from 521 flights
- December 2024: 69.7% from 582 flights
- January 2025: 73.5% from 544 flights
- February 2025: 74.4% from 497 flights
- March 2025: 69.4% from 593 flights
- April 2025: 75.8% from 563 flights
- May 2025: 74.2% from 537 flights
- June 2025: 60.3% from 506 flights
- July 2025: 58.4% from 519 flights
- August 2025: 67.7% from 498 flights
- September 2025: 80.1% from 421 flights
- October 2025: 79.3% from 485 flights
- November 2025: 72.3% from 495 flights
- December 2025: 68.8% from 587 flights
- January 2026: 66.6% from 547 flights
- February 2026: 75.2% from 491 flights
- March 2026: 65.9% from 571 flights
- April 2026: 74.4% from 573 flights
- May 2026: 69.4% from 552 flights
- June 2026: 77.1% from 490 flights
- July 2026: 63.4% from 558 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 71.3% against 73.2% in the 12 months before — declining by 1.9 percentage points.
Data and methodology
Calculated by FlyerIntel from 20,130 ATL → MIA flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed