SJU to MIA flight delays & on-time performance
Nonstop flights from Luis Munoz Marin International Airport to Miami International Airport · 1,045 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SJU or MIA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from San Juan (SJU) to Miami (MIA) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 1% were cancelled, and 9% arrived an hour or more late.
- American Airlines was the most punctual airline here (79% on time); Spirit Airlines was the least (71%).
- Departures scheduled around 6am did best (96% on time); around 5pm did worst (58%).
- Wednesday was the most reliable day to fly (85% on time) and Sunday the least (73%).
- The largest source of delay minutes was late-arriving aircraft (54%).
Which airline is most on time from SJU to MIA?
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 | 79% | 0.7% | 20 min | 8.5% | 2,110 |
| Frontier Airlines | 78% | 1.8% | 22 min | 10.8% | 379 |
| Spirit Airlines | 71% | 2.6% | 30 min | 12.0% | 154 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am87%63 flights
- 6am96%268 flights
- 7am95%137 flights
- 8am86%43 flights
- 9am86%58 flights
- 10am86%196 flights
- 11am85%356 flights
- 12pm80%175 flights
- 1pm79%224 flights
- 2pm78%145 flights
- 3pm62%158 flights
- 4pm64%178 flights
- 5pm58%119 flights
- 6pm67%168 flights
- 7pm69%258 flights
- 9pm70%31 flights
- 10pm64%29 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday78%1.0% cancelled
- Tuesday79%1.2% cancelled
- Wednesday85%0.3% cancelled
- Thursday80%0.5% cancelled
- Friday80%0.2% cancelled
- Saturday74%2.4% cancelled
- Sunday73%1.2% 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 aircraft54%
- Airline (crew, maintenance, cleaning, fueling)35%
- Air traffic control & airport congestion8%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)38%
- Extreme weather31%
- Air traffic control & airport congestion31%
- Security0%
SJU to MIA: common questions
- How often are SJU to MIA flights on time?
- 78% 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 San Juan to Miami cancelled?
- 1.0% of scheduled flights were cancelled (26 of 2,643).
- How long are typical delays?
- Across all flights the average arrival delay was 21 min (early arrivals count as zero). Flights that were late arrived 91 min behind schedule on average, and 9.0% of flights were an hour or more late.
- How long is taxi time at SJU?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MIA to SJU — 75% on time
More flights from San Juan
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SJU → MIA, nonstop flights by US airlines that report to the DOT. How we calculate this.