Best Time to Fly DEN to SJU: On-Time Stats by Hour & Airline
Denver International → Luis Munoz Marin International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.0% of Denver (DEN) to San Juan (SJU) flights arrived on time (333 scheduled flights). That is 5.4 points above the national average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
April has been the best month (90% on time) and Saturday the weakest day of the week (66%).
0.3% of flights were cancelled, versus 1.8% nationally.
DEN to SJU 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 | 83.0% | 49 min | 0.3% | 333 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to SJU
On-time arrival % by scheduled departure hour (local time), 639 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 9am–10am | 76.4% | 0.2% | 639 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN to SJU
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 | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 30 | ||
| Summer peak (Jun 15 - Aug 15) | 63.1% | -16.8 pts | 0.0% | 124 |
| All other days | 79.9% | — | 0.0% | 471 |
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).