Chicago (ORD) to San Juan (SJU): On-Time Performance
Data through May 2026
Chicago (ORD) to San Juan (SJU) effectively runs on two schedules. In February 2025, 89% of arrivals were on time; in March 2026 that fell to 59% — a 30-point seasonal swing. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (78% vs 66%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.3%
- Flights/day
- 3.9
- last 12 months
- Duration
- 4h 43m
- scheduled
- Distance
- 2,072 mi
Best airline from ORD to SJU
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 79% | 12 min | 0.2% | 1,221 |
| American Airlines | 77% | 14 min | 0.9% | 671 |
| Spirit Airlines | 73% | 22 min | 3.4% | 804 |
Monthly on-time trend
Best time to fly from ORD to SJU
Aim for departures around 1 p.m. (92% on-time); avoid 8 p.m. departures (53%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 12 min |
| Tuesdaybest | 81% | 20 min |
| Wednesday | 79% | 15 min |
| Thursday | 76% | 15 min |
| Friday | 74% | 15 min |
| Saturday | 79% | 13 min |
| Sunday | 72% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft26%
- Airline operations33%
- National airspace system34%
- Weather7%
Frequently asked questions
- How often are flights from ORD to SJU delayed?
- 23% of ORD–SJU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from ORD to SJU?
- United Airlines has the best on-time record on this route at 79%, based on 1,221 flights. 3 airlines flew ORD–SJU frequently enough to compare in this period.
- What is the best time of day to fly from ORD to SJU?
- Departures around 1 p.m. have the best record (92% on-time), while departures around 8 p.m. have the worst (53%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to SJU?
- The scheduled ORD–SJU flight time averages 4h 43m over 2,072 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are ORD to SJU flights cancelled?
- 1.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from ORD to SJU?
- March 2026 was the roughest month in this dataset, with only 59% of arrivals on time. The best was February 2025 at 89%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 2,707 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.