Miami (MIA) Flight Delays: Rate, Worst Hours and Live Risk
Miami (MIA) is ranked 2 of 22 for delays among DelayGuard's guide airports (1 is the highest rate): 27.0% of flights departing MIA arrived 15 or more minutes late across 319,024 flights, January 2023 to December 2025. American Airlines operated 54.3% of those departures, with a 29.1% delay rate of its own. The worst scheduled departure hours are 5 PM (36.9%) and 6 PM (36.4%); 5 AM is the best at 10.2%. 1.49% of scheduled MIA departures were cancelled in 2024 to 2025.
These figures are historical US domestic rates, not a forecast for one departure. Use the per-flight delay estimate before you book.
Delay window: January 2023 to December 2025. Cancellation window: 2024 to 2025. Last updated: 2026-10-18. Delayed means a flight arrived 15 or more minutes after its scheduled arrival, the BTS and DOT on-time standard. Cancelled and diverted flights are excluded from delay rates. Historical BTS figures are separate from DelayGuard's per-flight model probability and from live FAA, weather and ground-delay status.
Layover buffer
Chance an inbound arrival is 45+ min late at MIA: 11.32%.
36,106 of 318,833 arrivals, January 2023 to December 2025. Not a missed-connection rate.
Flight delays today at MIA
FAA now: No FAA program
Tomorrow: Typical
October delay rate: 17.8%
FAA now is the current National Airspace System program.
Historical delay rate (15+ min late) at MIA
Sample size: 319,024 flights, window: January 2023 to December 2025. Delay rate 27.0%. Source: Bureau of Transportation Statistics (BTS). Cancellation rate 1.49% of 221,851 scheduled flights, 2024 to 2025.
Why MIA runs the way it does
American Airlines flew 54.3% of MIA departures in the window, and its flights ran 29.1% late against 27.0% for the airport as a whole. With one carrier that large, MIA's delay record largely follows how American Airlines runs its schedule.
MIA delays peak in July (36.7%), June (35.2%) and August (33.4%) and are lowest in October (17.8%). That shape is consistent with the summer thunderstorm season, when convective weather builds through the afternoon and slows arrivals and departures.
Delays build through the day: 11.0% of flights scheduled before 8 AM ran late against 32.3% after 8 PM. That is the pattern BTS describes as late-arriving aircraft, where a previous flight with the same aircraft arriving late makes the next departure late.
Spirit Airlines flew 5.4% of MIA departures in this history. Spirit stopped flying on 2 May 2026, so today's carrier mix differs from the one behind these figures.
Best and worst times to fly from MIA
| Hour | Delayed 15+ min | Flights |
|---|---|---|
| 5 AM | 10.2% | 3,905 |
| 6 AM | 11.5% | 14,024 |
| 7 AM | 10.9% | 17,935 |
| 8 AM | 12.6% | 26,949 |
| 9 AM | 15.8% | 13,890 |
| 10 AM | 18.5% | 11,925 |
| 11 AM | 23.2% | 11,834 |
| 12 PM | 24.7% | 13,909 |
| 1 PM | 26.9% | 16,294 |
| 2 PM | 30.9% | 17,068 |
| 3 PM | 33.0% | 19,550 |
| 4 PM | 35.1% | 16,913 |
| 5 PM | 36.9% | 21,165 |
| 6 PM | 36.4% | 17,714 |
| 7 PM | 35.8% | 28,782 |
| 8 PM | 35.4% | 18,589 |
| 9 PM | 31.4% | 34,298 |
| 10 PM | 30.5% | 13,725 |
| 11 PM | 33.4% | 494 |
MIA delays and cancellations by month
| Month | Delayed 15+ min | Flights | Cancelled |
|---|---|---|---|
| Jan | 26.0% | 28,414 | 2.32% |
| Feb | 23.1% | 26,775 | 0.60% |
| Mar | 30.3% | 29,891 | 1.71% |
| Apr | 26.5% | 27,604 | 0.79% |
| May | 28.7% | 27,279 | 0.93% |
| Jun | 35.2% | 24,659 | 3.09% |
| Jul | 36.7% | 25,691 | 2.35% |
| Aug | 33.4% | 25,047 | 2.48% |
| Sep | 23.5% | 22,501 | 0.59% |
| Oct | 17.8% | 24,662 | 1.12% |
| Nov | 18.4% | 26,859 | 1.05% |
| Dec | 24.8% | 29,642 | 0.81% |
Airlines at MIA
| Airline | Share of departures | Delayed 15+ min | Flights | Cancelled |
|---|---|---|---|---|
| American Airlines | 54.3% | 29.1% | 173,076 | 1.44% |
| Envoy Air | 12.7% | 20.2% | 40,437 | 1.44% |
| Delta Air Lines | 10.1% | 26.4% | 32,335 | 1.23% |
| United Airlines | 5.8% | 23.8% | 18,497 | 1.76% |
| Spirit Airlines (ceased 2 May 2026) | 5.4% | 26.9% | 17,191 | 1.90% |
| Southwest Airlines | 5.4% | 25.3% | 17,090 | 1.17% |
| Frontier Airlines | 3.4% | 27.2% | 10,879 | 2.15% |
| JetBlue Airways | 1.7% | 33.1% | 5,577 | 2.20% |
| Republic Airways | 0.8% | 24.5% | 2,476 | 1.24% |
| Alaska Airlines | 0.4% | 28.7% | 1,434 | 3.16% |
Regional operators are reported separately from the airline brands they fly for.
Routes from MIA
| Route | Delayed 15+ min | Flights | Cancelled | Link |
|---|---|---|---|---|
| MIA to ATL | 29.0% | 19,463 | 1.31% | Route page |
| MIA to LGA | 28.0% | 16,720 | 2.26% | Predict |
| MIA to JFK | 28.6% | 16,102 | 1.87% | Route page |
| MIA to DFW | 29.6% | 13,548 | 1.85% | Route page |
| MIA to ORD | 24.9% | 12,614 | 1.12% | Route page |
| MIA to EWR | 28.3% | 12,576 | 2.57% | Route page |
| MIA to MCO | 27.0% | 11,286 | 1.51% | Route page |
| MIA to BOS | 29.6% | 11,078 | 1.50% | Route page |
| MIA to DCA | 25.9% | 10,887 | 2.02% | Predict |
| MIA to CLT | 24.8% | 10,604 | 1.24% | Route page |
| MIA to LAX | 27.4% | 10,307 | 0.42% | Route page |
| MIA to IAH | 27.4% | 9,824 | 1.99% | Predict |
| MIA to PHL | 25.6% | 9,247 | 1.72% | Predict |
| MIA to SJU | 23.5% | 8,233 | 0.76% | Predict |
| MIA to TPA | 28.7% | 7,685 | 1.95% | Predict |
Nearby airports
- Fort Lauderdale (FLL): 27.3% delayed
- Do rocket launches delay flights in Florida?
- Summer thunderstorm delays: which airports suffer most
- Thanksgiving and Christmas 2026 flight delay guide
- US airline cancellation rates
Questions
- How often are flights delayed at MIA?
- 27.0% of flights departing MIA arrived 15 or more minutes late across 319,024 flights, January 2023 to December 2025 (BTS). Across all US domestic flights in the data, the rate is 21.2%.
- What is the best time to fly from MIA?
- Early departures run best. 5 AM flights ran 10.2% late (3,905 flights), 7 AM flights ran 10.9% late (17,935 flights) and 6 AM flights ran 11.5% late (14,024 flights). The worst hours are 5 PM (36.9%), 6 PM (36.4%) and 7 PM (35.8%).
- Which month is worst for delays at MIA?
- July has the highest delay rate at 36.7%. October is the lowest at 17.8%.
- Which airline has the best on-time record at MIA?
- Among carriers still flying with at least 5,000 flights from MIA, Envoy Air has the lowest delay rate at 20.2% (40,437 flights). JetBlue Airways is highest at 33.1%. Regional operators such as SkyWest are reported separately from the airline brands they fly for.
- How often are MIA flights cancelled?
- 1.49% of 221,851 scheduled departures from MIA were cancelled in 2024 to 2025. The US figure over the same period is 1.41%. See the full ranking on the cancellation rates page.
- Does DelayGuard show live delays at MIA?
- Yes. The live module on this page shows DelayGuard's hourly risk score and any active FAA ground stop or ground delay program. It is separate from the historical BTS figures above. For a specific flight, the predictor gives a model probability that combines history, weather and FAA data.
- Why does MIA have delays?
- American Airlines flew 54.3% of MIA departures in the window, and its flights ran 29.1% late against 27.0% for the airport as a whole. With one carrier that large, MIA's delay record largely follows how American Airlines runs its schedule. MIA delays peak in July (36.7%), June (35.2%) and August (33.4%) and are lowest in October (17.8%). That shape is consistent with the summer thunderstorm season, when convective weather builds through the afternoon and slows arrivals and departures.
- Is MIA better than nearby airports?
- Compare MIA with FLL (27.3%) on the South Florida: MIA vs FLL compared page. Those are the delay rates for flights departing each airport over the same window.