Best Time to Fly SJU to ORD: On-Time Stats by Hour & Airline
Luis Munoz Marin International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
1,394 flights were scheduled from San Juan (SJU) to Chicago (ORD) in the last 12 months, and 78.6% of those that flew arrived on time, 1.0 points above the US average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 81.3%, while Frontier Airlines trailed at 60.5%.
June has been the best month (86% on time) and Thursday the weakest day of the week (78%).
2.4% of flights were cancelled, versus 1.8% nationally.
SJU to ORD 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 |
|---|---|---|---|---|
| United Airlines | 81.3% | 38 min | 0.6% | 665 |
| Spirit Airlines | 78.0% | 81 min | 6.9% | 261 |
| American Airlines | 76.2% | 107 min | 2.1% | 426 |
| Frontier Airlines | 60.5% | 100 min | 4.8% | 42 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJU to ORD
On-time arrival % by scheduled departure hour (local time), 2,663 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 94.3% | 1.4% | 71 |
| 1am–2am | Limited data | 34 | |
| 4am–5am | Limited data | 21 | |
| 5am–6am | 86.8% | 0.0% | 38 |
| 6am–7am | 92.2% | 3.0% | 199 |
| 7am–8am | 96.3% | 0.3% | 332 |
| 8am–9am | 95.6% | 1.0% | 209 |
| 9am–10am | Limited data | 13 | |
| 10am–11am | Limited data | 5 | |
| 11am–12pm | 72.2% | 5.3% | 38 |
| 12pm–1pm | Limited data | 24 | |
| 1pm–2pm | 71.8% | 2.4% | 41 |
| 2pm–3pm | 73.0% | 0.0% | 183 |
| 3pm–4pm | 70.5% | 0.2% | 841 |
| 4pm–5pm | 70.3% | 1.1% | 377 |
| 5pm–6pm | Limited data | 18 | |
| 6pm–7pm | Limited data | 6 | |
| 7pm–8pm | 79.1% | 2.2% | 89 |
| 8pm–9pm | 72.8% | 3.6% | 84 |
| 9pm–10pm | 95.0% | 0.0% | 40 |
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 ORD
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) | 76.8% | -3.4 pts | 0.0% | 56 |
| Christmas & New Year (Dec 20 - Jan 3) | 72.7% | -7.5 pts | 4.1% | 145 |
| Summer peak (Jun 15 - Aug 15) | 79.1% | -1.1 pts | 0.8% | 475 |
| All other days | 80.2% | — | 1.3% | 1,987 |
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).