BWI to SJU flight delays & on-time performance
Nonstop flights from Baltimore/Washington International Thurgood Marshall Airport to Luis Munoz Marin International Airport · 1,565 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BWI or SJU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Baltimore (BWI) to San Juan (SJU) arrived on time 67% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.4% were cancelled, and 10% arrived an hour or more late.
- Spirit Airlines was the most punctual airline here (75% on time); Frontier Airlines was the least (55%).
- Departures scheduled around 6am did best (80% on time); around 12pm did worst (51%).
- Wednesday was the most reliable day to fly (76% on time) and Sunday the least (58%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (39%).
Which airline is most on time from BWI to SJU?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Spirit Airlines | 75% | 5.7% | 21 min | 9.1% | 174 |
| Southwest Airlines | 68% | 0.9% | 20 min | 8.5% | 817 |
| Frontier Airlines | 55% | 6.4% | 44 min | 21.9% | 171 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am80%124 flights
- 8am77%303 flights
- 9am78%27 flights
- 10am54%26 flights
- 11am68%84 flights
- 12pm51%60 flights
- 1pm69%13 flights
- 3pm48%29 flights
- 5pm61%28 flights
- 6pm67%147 flights
- 7pm56%107 flights
- 8pm57%197 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday64%4.2% cancelled
- Tuesday73%1.4% cancelled
- Wednesday76%0.7% cancelled
- Thursday62%0.6% cancelled
- Friday66%0.6% cancelled
- Saturday71%5.3% cancelled
- Sunday58%3.4% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)39%
- Late-arriving aircraft29%
- Air traffic control & airport congestion26%
- Extreme weather5%
- Security1%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather61%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion14%
- Security0%
BWI to SJU: common questions
- How often are BWI to SJU flights on time?
- 67% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Baltimore to San Juan cancelled?
- 2.4% of scheduled flights were cancelled (28 of 1,162).
- How long are typical delays?
- Across all flights the average arrival delay was 23 min (early arrivals count as zero). Flights that were late arrived 65 min behind schedule on average, and 10.5% of flights were an hour or more late.
- How long is taxi time at BWI?
- Flights on this route spent 18 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SJU to BWI — 79% on time
More flights from Baltimore
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BWI → SJU, nonstop flights by US airlines that report to the DOT. How we calculate this.