Route profile
MIA→ATL
Flight reliability, delays and best times to fly from Miami to Atlanta, 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 14% of comparable major US routes (4,598 compared)
Calculated from 20,121 flights. How this is calculated
MIA → ATL arrives on time 71.9% of the time; the return trip, ATL → MIA, arrives on time 71.5% of the time.
MIA → ATL spends 32.8 minutes on the ground on a 594-mile trip: 21.7 minutes from pushback to wheels-up at MIA and 11.1 minutes from touchdown to gate at ATL.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
On-time performance swings unusually widely by time of day here, wider than 95% of 4,023 comparable routes.
88.0% on time for 5–9 AM departures, against 54.5% for 6–9 PM.
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 4,023 in the comparison.
Why MIA → ATL flights are cancelled
July 2023 – July 2026
MIA → ATL cancelled 264 of 20,121 scheduled flights — about 1 in every 76. The reason filed most often was extreme weather, 54.9% of the cancellations coded on this route — about 1 in every 139 scheduled flights.
Share of cancellations
Of 264 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.
145 cancellations, 54.9% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
111 cancellations, 42.0% 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, 3.0% 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.
264 coded cancellations were recorded on MIA → ATL; the section appears from 50.
When it goes wrong
July 2023 – July 2026
66 min late
against a median of 3 min early
MIA → ATL has an average that understates its risk: a typical arrival is 3 min early, but the worst tenth are 69 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 20,121 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at ATL after arriving from MIA.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 44% | Likely to miss |
| 45 min | 27% | High risk |
| 60 min | 19% | High risk |
| 90 min | 11% | Some risk |
| 120 min | 7.2% | 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 1.31% of the time and diverts 0.19% of the time, which a late arrival never shows up in.
Chance of missing is the share of 19,818 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 66 minutes late (90th-percentile gate arrival delay), over 20,121 operations.
Any other layover length: connection checker.
Best time to fly
MIA → ATL flights departing 5–9 AM arrived on time 88.0% of the time, against 54.5% for 6–9 PM departures, a gap of 33.5 percentage points.
By day and hour
On-time arrival rate for each weekday and scheduled departure hour, in local time at the departure airport (MIA).
Hour of departure matters more than day of the week: hourly averages sit a typical 12.6 points from the route-wide rate, weekday averages 4.3 points.
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On-time rate, % · stronger color, fewer on time
- 40–49
- 50–59
- 60–69
- 70–79
- 80–89
- 90–99
- 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 after 10 PM (703 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 |
|---|---|---|---|---|---|---|---|
| 5 AM–6 AM | 86.9% on time123 flights | 76 flights, too few to score | 74 flights, too few to score | 113 flights, too few to score | 88.0% on time128 flights | 112 flights, too few to score | 118 flights, too few to score |
| 6 AM–7 AM | 88.0% on time221 flights | 90.6% on time206 flights | 90.0% on time212 flights | 93.6% on time224 flights | 90.3% on time218 flights | 89.9% on time210 flights | 87.8% on time226 flights |
| 7 AM–8 AM | 84.5% on time213 flights | 86.4% on time186 flights | 91.6% on time179 flights | 93.8% on time210 flights | 90.0% on time212 flights | 88.9% on time205 flights | 85.0% on time213 flights |
| 8 AM–9 AM | 82.0% on time311 flights | 87.9% on time342 flights | 86.2% on time321 flights | 89.2% on time314 flights | 87.3% on time309 flights | 83.9% on time283 flights | 82.8% on time327 flights |
| 9 AM–10 AM | 29 flights, too few to score | 27 flights, too few to score | 25 flights, too few to score | 22 flights, too few to score | 37 flights, too few to score | 41 flights, too few to score | 24 flights, too few to score |
| 10 AM–11 AM | 88.0% on time192 flights | 83.9% on time193 flights | 75.3% on time191 flights | 80.7% on time209 flights | 79.8% on time191 flights | 76.3% on time194 flights | 72.2% on time183 flights |
| 11 AM–12 PM | 96 flights, too few to score | 76 flights, too few to score | 79 flights, too few to score | 96 flights, too few to score | 99 flights, too few to score | 63 flights, too few to score | 114 flights, too few to score |
| 12 PM–1 PM | 74.9% on time221 flights | 78.1% on time211 flights | 83.7% on time191 flights | 74.8% on time210 flights | 70.3% on time211 flights | 67.7% on time206 flights | 69.2% on time219 flights |
| 1 PM–2 PM | 68 flights, too few to score | 68 flights, too few to score | 59 flights, too few to score | 75 flights, too few to score | 65 flights, too few to score | 93 flights, too few to score | 75 flights, too few to score |
| 2 PM–3 PM | 72.4% on time195 flights | 68.3% on time208 flights | 75.0% on time227 flights | 62.7% on time215 flights | 68.3% on time203 flights | 60.2% on time245 flights | 55.7% on time213 flights |
| 3 PM–4 PM | 68.1% on time140 flights | 71.3% on time136 flights | 70.7% on time125 flights | 61.3% on time137 flights | 68.3% on time127 flights | 59.5% on time162 flights | 54.3% on time120 flights |
| 4 PM–5 PM | 60.9% on time263 flights | 69.6% on time261 flights | 69.7% on time263 flights | 58.9% on time235 flights | 61.8% on time266 flights | 60.8% on time213 flights | 45.5% on time249 flights |
| 5 PM–6 PM | 104 flights, too few to score | 113 flights, too few to score | 72.4% on time123 flights | 57.6% on time120 flights | 52.5% on time124 flights | 62.0% on time132 flights | 53.8% on time123 flights |
| 6 PM–7 PM | 48.5% on time201 flights | 63.8% on time200 flights | 68.2% on time199 flights | 55.6% on time192 flights | 58.6% on time197 flights | 46.5% on time161 flights | 40.4% on time211 flights |
| 7 PM–8 PM | 47.2% on time272 flights | 69.6% on time173 flights | 60.5% on time180 flights | 55.9% on time263 flights | 59.7% on time279 flights | 51.9% on time164 flights | 40.4% on time240 flights |
| 8 PM–9 PM | 66 flights, too few to score | 35 flights, too few to score | 39 flights, too few to score | 66 flights, too few to score | 76 flights, too few to score | 52 flights, too few to score | 66 flights, too few to score |
| 9 PM–10 PM | 62.9% on time142 flights | 74.6% on time142 flights | 65.5% on time149 flights | 56.9% on time146 flights | 58.3% on time140 flights | 61.3% on time143 flights | 55.6% on time143 flights |
By departure window
By departure hour
- 12 AM to 4 AM: too few flights to score
- 5 AM: 90.1% on time from 744 flights
- 6 AM: 90.0% on time from 1,517 flights
- 7 AM: 88.6% on time from 1,418 flights
- 8 AM: 85.7% on time from 2,207 flights
- 9 AM: 77.6% on time from 205 flights
- 10 AM: 79.6% on time from 1,353 flights
- 11 AM: 78.9% on time from 623 flights
- 12 PM: 74.0% on time from 1,469 flights
- 1 PM: 72.2% on time from 503 flights
- 2 PM: 65.9% on time from 1,506 flights
- 3 PM: 64.8% on time from 947 flights
- 4 PM: 61.2% on time from 1,750 flights
- 5 PM: 61.7% on time from 839 flights
- 6 PM: 54.7% on time from 1,361 flights
- 7 PM: 54.3% on time from 1,571 flights
- 8 PM: 54.5% on time from 400 flights
- 9 PM: 62.1% on time from 1,005 flights
- 10 PM: 66.6% on time from 698 flights
- 11 PM: too few flights to score
Why MIA → ATL 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 MIA → ATL. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on MIA → ATL, at 41.2%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 88.0% of the time and 6–9 PM departures 54.5%.
How this route holds up in bad weather
July 2023 – July 2026
Bad weather raises cancellations by a similar amount at both ends of MIA to ATL: 3.3 times the normal rate at MIA and 3.3 times at ATL. Cancelled in bad weather against normal hours: MIA 4.5% against 1.3%, ATL 3.4% against 1.0%. 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 | MIA | ATL |
|---|---|---|
| Cancelled in bad weather | 4.5% | 3.4% |
| Cancelled in normal hours | 1.3% | 1.0% |
| Arrived on time, bad weather | 50.6% | 66.5% |
| Arrived on time, normal hours | 74.1% | 80.2% |
| Departures in bad weather | 15,746 | 105,854 |
Of the carriers on this route, Delta Air Lines (2.0% cancelled against 4.7% for the other carriers at MIA) cancelled the fewest departures from MIA in bad weather and Envoy Air (6.4% cancelled against 4.4% for the other carriers at MIA) the most.
This route’s airlines in bad weather at MIA
All departures from MIA| Airline | Bad-weather departures | Cancelled | Other carriers |
|---|---|---|---|
| Delta Air Lines | 1,774 | 2.0%below the others | 4.7% |
| Southwest Airlines | 914 | 2.4%below the others | 4.5% |
| Frontier Airlines | 557 | 3.9%about level | 4.2% |
| Spirit Airlines | 766 | 4.8%about level | 4.4% |
| American Airlines | 8,534 | 5.4%above the others | 4.2% |
| Envoy Air | 1,840 | 6.4%above the others | 4.4% |
These are airport figures, not route figures: every scheduled departure from MIA and ATL, to any destination, in hours the weather report called bad. The airline rows count each carrier’s departures from MIA on every route.
Weather source and limits. In full: MIA (airlines), ATL, 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 | 9,995 | 73.9% | 1.18% | -3 min | 10.1% |
| American Airlines | 5,221 | 66.1% | 1.34% | 0 min | 14.1% |
| Frontier Airlines | 2,172 | 67.7% | 2.07% | -2 min | 13.1% |
| Southwest Airlines | 1,277 | 81.4% | 0.78% | -6 min | 5.9% |
| Spirit Airlines | 771 | 75.6% | 2.08% | -4 min | 10.1% |
| Envoy Air | 612 | 79.2% | 0.82% | -5 min | 5.0% |
Delta Air Lines flew 49.9% of the 20,048 flights listed. Spirit Airlines cancelled 2.08% of its flights here against 0.78% for Southwest Airlines.
Southwest Airlines arrived on time 15.3 percentage points more often than American Airlines on this route.
Other ways to fly Miami to Atlanta
Airport pairs in the same two city markets, as the DOT defines them.
| Route | Flights | On time | Cancelled | Median delay | Score |
|---|---|---|---|---|---|
| FLL→ATL Fort Lauderdale to Atlanta | 22,812 | 71.4% | 1.57% | -3 min | 49 |
| MIA→ATL this route Miami to Atlanta | 20,121 | 71.9% | 1.31% | -3 min | 50 |
Flying to ATL from the Miami area? Compare MIA, FLL for ATL, with the same test for what counts as a real difference.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
DL1249 (6:00 AM) arrived on time 92.2% of the time, 16.0 points more often than F92483 (6:00 AM) at 76.2%.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 13.5 percentage points.
By month
- Jan: 71.2%
- Feb: 74.4%
- Mar: 69.1%
- Apr: 74.3%
- May: 70.3%
- Jun: 68.4%
- Jul: 59.8%
- Aug: 65.5%
- Sep: 75.6%
- Oct: 82.4%
- Nov: 80.8%
- Dec: 75.0%
July is historically the weakest month and October the strongest, a spread of 22.6 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 57.5% from 578 flights
- August 2023: 66.4% from 543 flights
- September 2023: 71.3% from 543 flights
- October 2023: 79.3% from 528 flights
- November 2023: 81.5% from 551 flights
- December 2023: 76.4% from 657 flights
- January 2024: 66.6% from 635 flights
- February 2024: 73.2% from 563 flights
- March 2024: 67.3% from 624 flights
- April 2024: 71.9% from 591 flights
- May 2024: 66.9% from 589 flights
- June 2024: 62.5% from 527 flights
- July 2024: 58.8% from 517 flights
- August 2024: 65.7% from 513 flights
- September 2024: 78.1% from 505 flights
- October 2024: 88.8% from 534 flights
- November 2024: 85.5% from 518 flights
- December 2024: 72.5% from 582 flights
- January 2025: 72.6% from 545 flights
- February 2025: 72.9% from 497 flights
- March 2025: 69.6% from 592 flights
- April 2025: 74.9% from 564 flights
- May 2025: 70.8% from 537 flights
- June 2025: 64.9% from 508 flights
- July 2025: 61.8% from 519 flights
- August 2025: 64.2% from 499 flights
- September 2025: 78.0% from 419 flights
- October 2025: 78.6% from 484 flights
- November 2025: 75.1% from 494 flights
- December 2025: 76.0% from 584 flights
- January 2026: 75.4% from 549 flights
- February 2026: 77.5% from 490 flights
- March 2026: 70.5% from 570 flights
- April 2026: 76.2% from 572 flights
- May 2026: 73.4% from 552 flights
- June 2026: 78.1% from 491 flights
- July 2026: 61.2% from 557 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 73.5% against 73.2% in the 12 months before — broadly unchanged.
Data and methodology
Calculated by FlyerIntel from 20,121 MIA → ATL 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