Baltimore (BWI) to San Juan (SJU): On-Time Performance
Data through July 2026
The calendar drives reliability on BWI–SJU. November 2024 flights landed on schedule 81% of the time, but August 2024 dropped to 50% — a gap of 32 points. Across the full period the route averages 68% on-time against a national 78%. Morning departures also hold up better than evening ones (76% vs 61%), which matters most in the rough months.
- On-time
- 68%
- arrived <15 min late
- Avg delay
- 23 min
- completed flights
- Cancelled
- 1.8%
- Flights/day
- 3.2
- last 12 months
- Duration
- 3h 59m
- scheduled
- Distance
- 1,565 mi
Best airline from BWI to SJU
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Spirit Airlinesmost reliable | 76% | 16 min | 3.7% | 574 |
| Southwest Airlines | 68% | 20 min | 0.6% | 1,710 |
| Frontier Airlines | 53% | 55 min | 5.0% | 318 |
Monthly on-time trend
Best time to fly from BWI to SJU
Aim for departures around 6 a.m. (80% on-time); avoid 9 p.m. departures (46%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 66% | 26 min |
| Tuesday | 73% | 17 min |
| Wednesdaybest | 74% | 20 min |
| Thursday | 65% | 24 min |
| Friday | 69% | 31 min |
| Saturday | 66% | 21 min |
| Sunday | 65% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft31%
- Airline operations34%
- National airspace system28%
- Weather7%
- Security1%
Frequently asked questions
- How often are flights from BWI to SJU delayed?
- 32% of BWI–SJU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 23 minutes.
- Which airline is most reliable from BWI to SJU?
- Spirit Airlines has the best on-time record on this route at 76%, based on 574 flights. 3 airlines flew BWI–SJU frequently enough to compare in this period.
- What is the best time of day to fly from BWI to SJU?
- Departures around 6 a.m. have the best record (80% on-time), while departures around 9 p.m. have the worst (46%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BWI to SJU?
- The scheduled BWI–SJU flight time averages 3h 59m over 1,565 miles. Actual arrival times vary — flights on this route land 15+ minutes late 32% of the time.
- How often are BWI to SJU flights cancelled?
- 1.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from BWI to SJU?
- August 2024 was the roughest month in this dataset, with only 50% of arrivals on time. The best was November 2024 at 81%. If your dates are flexible, that 32-point gap is worth planning around.
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Based on 2,602 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.