Best Time to Fly SJU to BWI: On-Time Stats by Hour & Airline
Luis Munoz Marin International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.3% of San Juan (SJU) to Baltimore (BWI) flights arrived on time (1,162 scheduled flights). That is 1.7 points above the national average of 77.6%.
Among 3 airlines, Southwest Airlines led with 81.5% on time and Spirit Airlines was last with 73.9%.
Over 24 months, Tuesday was the most reliable day (84% on time) and August the worst month (71%).
The cancellation rate was 2.5% (US average 1.8%).
SJU to BWI 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 |
|---|---|---|---|---|
| Southwest Airlines | 81.5% | 48 min | 1.0% | 818 |
| Frontier Airlines | 73.9% | 53 min | 5.3% | 171 |
| Spirit Airlines | 73.9% | 113 min | 6.9% | 173 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJU to BWI
On-time arrival % by scheduled departure hour (local time), 2,479 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 80.5% | 0.0% | 41 |
| 1am–2am | 76.9% | 4.9% | 41 |
| 2am–3am | Limited data | 16 | |
| 3am–4am | Limited data | 20 | |
| 4am–5am | 90.2% | 2.4% | 42 |
| 5am–6am | 88.7% | 0.3% | 292 |
| 6am–7am | 90.0% | 1.2% | 414 |
| 7am–8am | 81.9% | 4.8% | 145 |
| 8am–9am | Limited data | 30 | |
| 9am–10am | Limited data | 9 | |
| 10am–11am | 88.0% | 0.7% | 143 |
| 11am–12pm | 85.1% | 0.0% | 75 |
| 12pm–1pm | 83.8% | 0.0% | 37 |
| 1pm–2pm | 75.0% | 1.0% | 103 |
| 2pm–3pm | 68.8% | 0.0% | 78 |
| 3pm–4pm | 78.2% | 0.4% | 245 |
| 4pm–5pm | 72.4% | 1.5% | 330 |
| 5pm–6pm | 69.7% | 1.4% | 223 |
| 6pm–7pm | 66.7% | 4.2% | 72 |
| 7pm–8pm | Limited data | 27 | |
| 8pm–9pm | 50.0% | 8.0% | 50 |
| 9pm–10pm | 67.5% | 13.0% | 46 |
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 BWI
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) | 89.8% | +10.0 pts | 2.0% | 50 |
| Christmas & New Year (Dec 20 - Jan 3) | 83.2% | +3.4 pts | 5.5% | 145 |
| Summer peak (Jun 15 - Aug 15) | 75.9% | -3.9 pts | 1.2% | 506 |
| All other days | 79.8% | — | 1.4% | 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).