BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
MIA→SJU

Miami, FL (MIA) to San Juan, PR (SJU) flight delay odds

73.9% of 2,636 official scheduled MIA-to-SJU flights arrived on time; 17.5% arrived at least 30 minutes late and 0.9% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
73.9%arrived on time
17.5%30+ min late
0.9%cancelled
2,636scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.1%all scheduled flights
120+ minutes late4.0%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+12.5 mincompleted flights

Which departure time was most reliable for MIA to SJU?

Among qualifying MIA-to-SJU departure window results, Early morning had the highest on-time rate: 88.4% of 691 flights. Night was lowest at 56.0% across 218 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning69188.4%7.5%0.7%
Late morning42680.0%12.0%0.5%
Afternoon93867.8%21.9%0.9%
Evening36365.6%22.3%0.8%
Night21856.0%33.5%3.2%

Which weekday was most reliable for MIA to SJU?

Among qualifying MIA-to-SJU weekday results, Wednesday had the highest on-time rate: 81.1% of 318 flights. Sunday was lowest at 65.0% across 412 flights.

DayFlightsOn time30+ minCancelled
Monday40375.2%16.1%1.5%
Tuesday33078.8%14.5%1.2%
Wednesday31881.1%12.6%0.0%
Thursday39274.2%15.6%0.5%
Friday41177.9%16.1%0.0%
Saturday37067.0%22.7%2.4%
Sunday41265.0%23.8%1.0%

Which airline was most reliable for MIA to SJU?

Among qualifying MIA-to-SJU airline results, American Airlines had the highest on-time rate: 76.3% of 2,078 flights. Spirit Airlines was lowest at 53.6% across 179 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines2,07876.3%15.9%0.5%
Frontier Airlines37970.2%20.6%1.8%
Spirit Airlines17953.6%30.2%3.9%

Which month was most reliable for MIA to SJU?

Among qualifying MIA-to-SJU month results, May 2026 had the highest on-time rate: 85.5% of 214 flights. July 2025 was lowest at 62.3% across 215 flights.

MonthFlightsOn time30+ minCancelled
July 202521562.3%27.0%0.5%
August 202521068.6%21.0%0.5%
September 202516878.6%16.7%0.0%
October 202517673.3%17.6%0.0%
November 202521275.9%15.6%0.5%
December 202525779.8%12.8%0.8%
January 202625067.2%18.0%5.6%
February 202620875.5%16.3%0.5%
March 202627867.3%24.8%1.4%
April 202623471.4%18.8%0.4%
May 202621485.5%9.3%0.0%
June 202621484.6%10.7%0.0%

What drove MIA to SJU delay minutes?

Late aircraft was the largest recorded MIA-to-SJU delay category, accounting for 41.3% of 50,322 BTS-attributed delay minutes during July 2025–June 2026.

Airline38.7%
Late aircraft41.3%
National airspace16.7%
Weather3.3%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.