San Juan (SJU) to Baltimore (BWI): On-Time Performance
Data through July 2026
When you fly SJU to BWI matters as much as anything else about the booking: the route swung from 94% on-time in November 2024 to just 59% in August 2024. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 66%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 3.2
- last 12 months
- Duration
- 4h 12m
- scheduled
- Distance
- 1,565 mi
Best airline from SJU to BWI
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 81% | 11 min | 0.6% | 1,711 |
| Spirit Airlines | 77% | 19 min | 3.7% | 573 |
| Frontier Airlines | 69% | 23 min | 3.8% | 319 |
Monthly on-time trend
Best time to fly from SJU to BWI
Aim for departures around 4 a.m. (90% on-time); avoid 8 p.m. departures (50%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 15 min |
| Tuesdaybest | 83% | 14 min |
| Wednesday | 83% | 11 min |
| Thursday | 79% | 14 min |
| Friday | 75% | 19 min |
| Saturday | 77% | 16 min |
| Sunday | 80% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations30%
- National airspace system25%
- Weather1%
- Security1%
Frequently asked questions
- How often are flights from SJU to BWI delayed?
- 22% of SJU–BWI 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 14 minutes.
- Which airline is most reliable from SJU to BWI?
- Southwest Airlines has the best on-time record on this route at 81%, based on 1,711 flights. 3 airlines flew SJU–BWI frequently enough to compare in this period.
- What is the best time of day to fly from SJU to BWI?
- Departures around 4 a.m. have the best record (90% on-time), while departures around 8 p.m. have the worst (50%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to BWI?
- The scheduled SJU–BWI flight time averages 4h 12m over 1,565 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are SJU to BWI flights cancelled?
- 1.7% 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 SJU to BWI?
- August 2024 was the roughest month in this dataset, with only 59% of arrivals on time. The best was November 2024 at 94%. If your dates are flexible, that 35-point gap is worth planning around.
Explore related pages
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Related guides
Based on 2,603 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.