86% of flights from Miami to Key West arrived on time over the past 12 months. That is better than the typical U.S. route. The 9 a.m. departures ran on time 91% of the time; the noon ones 81%. 4% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for MIA → EYW: when a flight was late, it was under 45 minutes late 63% of the time. About 1 in 33 flights landed an hour or more late; 0.4% were cancelled outright.
- On time or early86%
- 15–30 min late5.8%
- 30–60 min late4.2%
- 1–2 hours late2.6%
- 2–3 hours late0.3%
- 3+ hours late0.2%
- Diverted0.4%
- Cancelled0.4%
Share of all 1,274 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| American Airlines | 1,274 | 86% | 0.4% | −10 min | 3.1% | +51 min | Envoy 93%, Republic Airways 5%, American Airlines 2% |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at MIA). Delays build through the day as late planes knock on, so early flights usually do best.
Last flight of the day
On MIA → EYW, each airline's last flight of the day was cancelled 1.4% of the time, against 0.0% for its earlier flights, about the same. It arrived 3+ hours late 0.3% of the time (earlier flights: 0.1%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| American Airlines | 6:11 p.m. | 1.4% | 0.3% | 0.0% | first flight 9:55 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
By month
Each calendar month pooled over 2023–2026. Best: October (91%). Worst: January (78%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 186 | 88% | 0.0% |
| Tuesday | 178 | 92% | 0.0% |
| Wednesday | 175 | 91% | 0.6% |
| Thursday | 175 | 89% | 0.6% |
| Friday | 182 | 85% | 1.1% |
| Saturday | 196 | 74% | 0.5% |
| Sunday | 182 | 85% | 0.0% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: air traffic/airport 5
Month by month
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Aug 29, 2026 | 4 | 0% | 0 |
| Feb 28, 2026 | 3 | 0% | 0 |
| Jan 4, 2026 | 4 | 25% | 0 |
| Dec 30, 2025 | 4 | 25% | 0 |
| Sep 12, 2025 | 3 | 33% | 0 |
Questions
How often are flights from MIA to EYW on time?
86% of 1,274 scheduled flights from Miami, FL to Key West, FL arrived within 15 minutes of schedule between September 2025 and August 2026. 0.4% were cancelled.
What is the best time of day to fly MIA to EYW?
Flights scheduled to leave at 9 a.m. were the most reliable (91% on time). The noon departures were the least (81%).
What month has the most delays from MIA to EYW?
January (78% on time). The best month is October (91%), over 2023–2026.
Is the last flight of the day from MIA to EYW more likely to be cancelled?
Yes. Each airline's last MIA–EYW flight of the day was cancelled 1.4% of the time over the past year, against 0.0% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- EYW → MIA (return)
- Miami (MIA) delays by hour
- Flights into Key West (EYW)
- American Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.