Best Time to Fly SJU to DTW: On-Time Stats by Hour & Airline
Luis Munoz Marin International → Detroit Metro Wayne County
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 82.5% of San Juan (SJU) to Detroit (DTW) flights arrived on time (357 scheduled flights). That is 4.8 points above the national average of 77.6%.
Among 2 airlines, Delta Air Lines led with 83.2% on time and Spirit Airlines was last with 75.0%.
Over 24 months, Wednesday was the most reliable day (86% on time) and January the worst month (65%).
The cancellation rate was 1.7% (US average 1.8%).
SJU to DTW on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 83.2% | 45 min | 1.9% | 324 |
| Spirit Airlines | 75.0% | 60 min | 0.0% | 33 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJU to DTW
On-time arrival % by scheduled departure hour (local time), 733 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 1am–2am | 88.2% | 0.0% | 34 |
| 2am–3am | Limited data | 1 | |
| 11am–12pm | Limited data | 16 | |
| 1pm–2pm | 92.7% | 0.0% | 41 |
| 2pm–3pm | 88.0% | 0.6% | 311 |
| 3pm–4pm | 79.1% | 1.1% | 273 |
| 4pm–5pm | 53.3% | 4.2% | 48 |
| 5pm–6pm | Limited data | 9 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SJU to DTW
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 13 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 61.8% | -22.6 pts | 6.7% | 60 |
| Summer peak (Jun 15 - Aug 15) | 86.1% | +1.7 pts | 1.2% | 168 |
| All other days | 84.4% | — | 0.4% | 492 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).