Best Time to Fly BWI to SJU: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Luis Munoz Marin International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 66.9% of Baltimore (BWI) to San Juan (SJU) flights arrived on time (1,162 scheduled flights). That is 10.7 points below the national average of 77.6%.
Spirit Airlines was the most punctual of the 3 airlines on the route at 75.0%, while Frontier Airlines trailed at 55.0%.
October has been the best month (77% on time) and Sunday the weakest day of the week (64%).
2.4% of flights were cancelled, versus 1.8% nationally.
BWI 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 |
|---|---|---|---|---|
| Spirit Airlines | 75.0% | 77 min | 5.8% | 174 |
| Southwest Airlines | 67.7% | 55 min | 0.9% | 817 |
| Frontier Airlines | 55.0% | 93 min | 6.4% | 171 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to SJU
On-time arrival % by scheduled departure hour (local time), 2,478 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 80.3% | 4.9% | 203 |
| 8am–9am | 77.3% | 0.6% | 475 |
| 9am–10am | 76.2% | 0.4% | 229 |
| 10am–11am | 74.5% | 0.9% | 107 |
| 11am–12pm | 65.8% | 5.0% | 120 |
| 12pm–1pm | 52.0% | 6.2% | 80 |
| 1pm–2pm | 63.8% | 0.0% | 69 |
| 2pm–3pm | 72.6% | 0.0% | 63 |
| 3pm–4pm | 65.6% | 0.0% | 61 |
| 4pm–5pm | Limited data | 11 | |
| 5pm–6pm | 61.0% | 0.0% | 41 |
| 6pm–7pm | 66.4% | 0.8% | 238 |
| 7pm–8pm | 65.6% | 0.8% | 358 |
| 8pm–9pm | 56.3% | 2.5% | 284 |
| 9pm–10pm | 48.4% | 1.5% | 65 |
| 10pm–11pm | 67.7% | 4.2% | 71 |
| 11pm–12am | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BWI 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) | 81.6% | +9.8 pts | 2.0% | 50 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.4% | -3.4 pts | 6.2% | 145 |
| Summer peak (Jun 15 - Aug 15) | 56.4% | -15.4 pts | 2.4% | 505 |
| All other days | 71.8% | — | 1.2% | 1,778 |
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).