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

Detroit, MI (DTW) to San Juan, PR (SJU) flight delay odds

74.5% of 385 official scheduled DTW-to-SJU flights arrived on time; 13.0% arrived at least 30 minutes late and 0.8% 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
74.5%arrived on time
13.0%30+ min late
0.8%cancelled
385scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.9%all scheduled flights
120+ minutes late1.6%all scheduled flights
Diverted0.5%did not reach as scheduled
Average arrival+7.2 mincompleted flights

Which departure time was most reliable for DTW to SJU?

Among qualifying DTW-to-SJU departure window results, Early morning had the highest on-time rate: 74.8% of 330 flights. Late morning was lowest at 72.2% across 54 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning33074.8%13.0%0.3%
Late morning5472.2%13.0%3.7%

Which weekday was most reliable for DTW to SJU?

Among qualifying DTW-to-SJU weekday results, Friday had the highest on-time rate: 78.7% of 61 flights. Saturday was lowest at 71.7% across 60 flights.

DayFlightsOn time30+ minCancelled
Monday6373.0%17.5%0.0%
Tuesday4673.9%15.2%0.0%
Wednesday4673.9%17.4%0.0%
Thursday5477.8%9.3%0.0%
Friday6178.7%11.5%0.0%
Saturday6071.7%8.3%5.0%
Sunday5572.7%12.7%0.0%

Which airline was most reliable for DTW to SJU?

Among qualifying DTW-to-SJU airline results, Spirit Airlines had the highest on-time rate: 80.3% of 61 flights. Delta Air Lines was lowest at 73.5% across 324 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines32473.5%13.3%0.9%
Spirit Airlines6180.3%11.5%0.0%

Which month was most reliable for DTW to SJU?

Among qualifying DTW-to-SJU month results, August 2025 had the highest on-time rate: 84.2% of 38 flights. January 2026 was lowest at 52.8% across 36 flights.

MonthFlightsOn time30+ minCancelled
July 20255879.3%10.3%0.0%
August 20253884.2%7.9%0.0%
September 20252176.2%9.5%0.0%
November 20252665.4%23.1%0.0%
December 20254362.8%23.3%0.0%
January 20263652.8%25.0%5.6%
February 20262878.6%10.7%0.0%
March 20263174.2%12.9%3.2%
April 20263080.0%3.3%0.0%
May 20263183.9%3.2%0.0%
June 20263076.7%13.3%0.0%

What drove DTW to SJU delay minutes?

National airspace was the largest recorded DTW-to-SJU delay category, accounting for 47.3% of 4,491 BTS-attributed delay minutes during July 2025–June 2026.

Airline41.3%
Late aircraft8.0%
National airspace47.3%
Weather3.4%
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.