MIA to SJU flight delays & on-time performance
Nonstop flights from Miami International Airport to Luis Munoz Marin International Airport · 1,045 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MIA or SJU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Miami (MIA) to San Juan (SJU) arrived on time 75% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.9% were cancelled, and 10% arrived an hour or more late.
- American Airlines was the most punctual airline here (77% on time); Spirit Airlines was the least (59%).
- Departures scheduled around 7am did best (92% on time); around 9pm did worst (59%).
- Wednesday was the most reliable day to fly (84% on time) and Sunday the least (66%).
- The largest source of delay minutes was late-arriving aircraft (41%).
Which airline is most on time from MIA to SJU?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| American Airlines | 77% | 0.5% | 17 min | 7.9% | 2,109 |
| Frontier Airlines | 72% | 1.6% | 25 min | 13.4% | 379 |
| Spirit Airlines | 59% | 4.7% | 46 min | 24.5% | 150 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am90%189 flights
- 7am92%151 flights
- 8am90%354 flights
- 9am88%154 flights
- 10am80%162 flights
- 11am86%87 flights
- 12pm65%242 flights
- 1pm73%173 flights
- 2pm70%202 flights
- 3pm70%300 flights
- 5pm63%65 flights
- 6pm64%86 flights
- 7pm60%125 flights
- 8pm69%79 flights
- 9pm59%171 flights
- 10pm57%42 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday78%1.5% cancelled
- Tuesday81%1.2% cancelled
- Wednesday84%0.0% cancelled
- Thursday76%0.5% cancelled
- Friday76%0.0% cancelled
- Saturday70%2.4% cancelled
- Sunday66%0.7% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft41%
- Airline (crew, maintenance, cleaning, fueling)39%
- Air traffic control & airport congestion17%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather38%
- Air traffic control & airport congestion33%
- Airline (crew, maintenance, cleaning, fueling)29%
- Security0%
MIA to SJU: common questions
- How often are MIA to SJU flights on time?
- 75% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Miami to San Juan cancelled?
- 0.9% of scheduled flights were cancelled (24 of 2,638).
- How long are typical delays?
- Across all flights the average arrival delay was 19 min (early arrivals count as zero). Flights that were late arrived 75 min behind schedule on average, and 9.6% of flights were an hour or more late.
- How long is taxi time at MIA?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SJU to MIA — 78% on time
More flights from Miami
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: MIA → SJU, nonstop flights by US airlines that report to the DOT. How we calculate this.