Airport month record
MIAJUL
Miami International in July 2025
- Departures
- 9,079
- Month
- July 2025
- National, same month
- 71.1%
- Carriers
- 10
Historical statistics for July 2025, not live status or a forecast for this year’s July. For today’s conditions at MIA, see live FAA status.
MIA in July draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 9,079 flights, of which Envoy Air flew 934 at 76.7% on time.
Envoy Air is the most reliable of the five carriers covered here at 76.7% on time across 934 flights.
Key figures
On time
63.6%
Arrivals under 15 minutes late, of 8,786 completed departures
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
2.60%
Nationally in July: 2.45%
Whole year
73.8%
MIA across all twelve months
These figures cover 9,079 departures from Miami International in July 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.
Against the year
July next to MIA's other months
Against MIA's own year, July ran 10 points worse than the twelve-month rate of 73.8%, which makes it the worst of the twelve months in the data. Cancellations are where July stands out: 2.60% of scheduled departures were called off, 1.6 times the airport's rate across the year.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| July 2025 (this page) | 9,079 | 63.6% | 84 min | 2.60% | D |
| August 2025 | 8,731 | 67.6% | 77 min | 0.86% | C+ |
| September 2025 | 7,573 | 78.6% | 70 min | 0.36% | B+ |
| October 2025 | 8,457 | 77.9% | 70 min | 0.37% | B+ |
| November 2025 | 9,270 | 77.0% | 67 min | 1.95% | B |
| December 2025 | 10,099 | 75.2% | 66 min | 1.15% | B |
| January 2026 | 10,439 | 76.0% | 77 min | 5.01% | B− |
| February 2026 | 9,304 | 75.3% | 64 min | 1.74% | B |
| March 2026 | 10,460 | 69.6% | 78 min | 2.96% | C |
| April 2026 | 9,556 | 75.3% | 62 min | 0.30% | B+ |
| May 2026 | 9,296 | 75.3% | 66 min | 0.45% | B+ |
| June 2026 | 8,797 | 74.2% | 72 min | 0.78% | C+ |
Departure window
The best time of day to leave MIA in July
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 39 points, against 18 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am963 flights89.9%
- 8am–11am1,412 flights81.4%
- 11am–2pm1,093 flights67.5%
- 2pm–5pm1,612 flights50.9%
- 5pm–8pm1,597 flights52.4%
- 8pm–5am2,402 flights56.4%
Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.9% of the time, against 50.9% for the afternoon window. That is 39 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 2,402 flights scheduled in it.
Across the week, Saturday is the strongest day at 70.6% on time and Sunday the weakest at 54.4%. 16 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at MIA in July
The choice of carrier is not cosmetic here. Envoy Air arrives on time 76.7% of the time; American Airlines manages 59.1%. Sample sizes sit next to every figure, because a two-point gap across 5,390 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| American Airlines | 5,390 | 59.1% | 88 min | 3.02% | D− |
| Envoy Air | 934 | 76.7% | 44 min | 0.43% | B+ |
| Delta Air Lines | 930 | 64.2% | 93 min | 3.33% | D− |
| United Airlines | 506 | 69.3% | 77 min | 1.98% | C |
| Southwest Airlines | 426 | 73.1% | 84 min | 1.41% | C |
| Frontier Airlinesthin sample | 334 | 75.2% | 80 min | 2.10% | B |
| Spirit Airlinesthin sample | 332 | 67.5% | 96 min | 2.71% | C |
| Republic Airwaysthin sample | 142 | 61.3% | 72 min | 0.00% | D+ |
| JetBlue Airwaysthin sample | 54 | 61.2% | 80 min | 9.26% | D− |
| Alaska Airlinesthin sample | 31 | 53.3% | 63 min | 3.23% | F− |
Delta Air Lines cancels 3.3% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Route by route
Busiest routes out of MIA in July
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MIA to ATL · Atlanta | 519 | 61.8% | 96 min | 1.54% | D |
| MIA to LGA · New York | 480 | 58.3% | 90 min | 8.33% | D− |
| MIA to DFW · Dallas-Fort Worth | 412 | 61.6% | 88 min | 2.91% | D |
| MIA to JFK · New York | 397 | 62.9% | 121 min | 6.80% | D− |
| MIA to ORD · Chicagothin sample | 337 | 56.7% | 80 min | 2.08% | D |
| MIA to DCA · Washingtonthin sample | 334 | 58.4% | 93 min | 7.78% | D− |
| MIA to IAH · Houstonthin sample | 311 | 68.3% | 93 min | 2.25% | C |
| MIA to CLT · Charlottethin sample | 310 | 64.6% | 86 min | 2.58% | D |
| MIA to MCO · Orlandothin sample | 309 | 51.8% | 85 min | 1.29% | F |
| MIA to EWR · Newarkthin sample | 303 | 59.7% | 99 min | 6.60% | D− |
| MIA to BOS · Bostonthin sample | 302 | 59.7% | 77 min | 4.64% | D− |
| MIA to LAX · Los Angelesthin sample | 277 | 64.5% | 92 min | 0.36% | D+ |
| MIA to TPA · Tampathin sample | 241 | 57.2% | 94 min | 2.07% | D |
| MIA to RDU · Raleighthin sample | 224 | 62.3% | 100 min | 1.79% | D |
| MIA to PHL · Philadelphiathin sample | 219 | 65.1% | 89 min | 1.83% | C |
| MIA to SJU · San Juanthin sample | 215 | 62.6% | 73 min | 0.47% | D+ |
| MIA to DEN · Denverthin sample | 207 | 76.1% | 74 min | 0.48% | B+ |
| MIA to BWI · Baltimorethin sample | 190 | 61.5% | 83 min | 5.26% | D− |
| MIA to AUS · Austinthin sample | 178 | 66.7% | 79 min | 2.25% | C |
| MIA to BNA · Nashvillethin sample | 176 | 64.0% | 95 min | 0.57% | D+ |
| MIA to LAS · Las Vegasthin sample | 161 | 64.2% | 89 min | 1.24% | D |
| MIA to JAX · Jacksonvillethin sample | 156 | 65.1% | 63 min | 1.92% | C |
| MIA to SFO · San Franciscothin sample | 155 | 71.2% | 57 min | 0.65% | C+ |
| MIA to PHX · Phoenixthin sample | 154 | 67.1% | 60 min | 0.65% | C+ |
| MIA to DTW · Detroitthin sample | 137 | 70.9% | 85 min | 1.46% | C |
Delay causes
What held MIA up in July
One category carries most of the weight here. Late-arriving aircraft accounts for 44% of the 269,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 44%Late-arriving aircraft
- 27%Carrier
- 22%National Airspace System
- 7%Extreme weather
- 0%Security
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 269,000 reported delay minutes here, that single category outweighs weather by 7 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 268,972 reported delay minutes.
Cancellations run at 2.60%, against 2.45% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 16.4% of arrivals land a full hour or more behind schedule, against 12.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
What to do with this
Flying from MIA in July
For a July trip through MIA: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 89.9% on time, and with 16.4% of arrivals an hour or more late, a connection here deserves more slack than the same trip in September would.
Related
Where to go next
- Miami International (MIA), the whole year
- MIA in August67.6%
- MIA in September78.6%
- MIA in October77.9%
- MIA in November77.0%
- MIA in December75.2%
- MIA in January76.0%
- MIA in February75.3%
- MIA in March69.6%
- MIA in April75.3%
- MIA in May75.3%
- MIA in June74.2%
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.