Route Reliability
Chicago → San Juan
ORD–SJU · 2,072 miles · Chicago O'Hare International Airport to Luis Muñoz Marín International Airport
- 75%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 2.0%
- Cancelled
- 1,429
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines79%665 flights
- 2.American Airlines77%429 flights
- 3.Spirit Airlines65%324 flights
Not enough history to rank: Frontier Airlines (11 flights). We rank airlines only after 100 flights on the route.
What the data says
Morning flights do better here.
ORD–SJU flights departing between 9 AM–12 PM arrived on time 85% of the time, versus 52% between 6–9 PM.
Sunday scaries are real for this one.
ORD–SJU flights arrived on time 79% of the time on Tuesdays. On Sundays: 70%.
United Airlines runs this route best.
United Airlines arrived on time 79% of the time on this route; Spirit Airlines managed 65%.
Slipping a little lately.
ORD–SJU flights arrived on time 74% of the time over the last three months in the data, compared with 77% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon70%(206 flights)
- Tue79%(189 flights)
- Wed79%(188 flights)
- Thu78%(202 flights)
- Fri76%(207 flights)
- Sat76%(201 flights)
- Sun70%(205 flights)
- 12–3 AM82%(11 flights)
- 3–6 AM68%(31 flights)
- 6–9 AM80%(702 flights)
- 9 AM–12 PM85%(33 flights)
- 12–3 PM76%(372 flights)
- 3–6 PM74%(38 flights)
- 6–9 PM52%(143 flights)
- 9 PM–12 AM78%(68 flights)
Jun 84% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 84% | 117 |
| July 2025 | 72% | 127 |
| August 2025 | 73% | 110 |
| September 2025 | 78% | 51 |
| October 2025 | 84% | 74 |
| November 2025 | 74% | 99 |
| December 2025 | 73% | 131 |
| January 2026 | 71% | 140 |
| February 2026 | 87% | 139 |
| March 2026 | 59% | 170 |
| April 2026 | 78% | 136 |
| May 2026 | 84% | 104 |
Same trip, other airports
Keep nerding
Based on 1,429 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.