JAX to SJU flight delays & on-time performance
Nonstop flights from Jacksonville International Airport to Luis Munoz Marin International Airport · 1,288 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at JAX or SJU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Jacksonville (JAX) to San Juan (SJU) arrived on time 72% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 3.1% were cancelled, and 9% arrived an hour or more late.
- Frontier Airlines was the most punctual airline here (73% on time); JetBlue was the least (70%).
- Departures scheduled around 11am did best (83% on time); around 7pm did worst (56%).
- Friday was the most reliable day to fly (80% on time) and Monday the least (66%).
- The largest source of delay minutes was late-arriving aircraft (64%).
Which airline is most on time from JAX 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 |
|---|---|---|---|---|---|
| Frontier Airlines | 73% | 4.2% | 32 min | 8.7% | 144 |
| JetBlue | 70% | 1.7% | 23 min | 9.6% | 117 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 10am65%27 flights
- 11am83%71 flights
- 3pm91%11 flights
- 4pm67%40 flights
- 5pm81%32 flights
- 6pm65%23 flights
- 7pm56%19 flights
- 8pm50%10 flights
- 9pm61%21 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday66%5.0% cancelled
- Tuesday67%0.0% cancelled
- Wednesday76%0.0% cancelled
- Thursday67%2.7% cancelled
- Friday80%2.2% cancelled
- Saturday76%2.6% cancelled
- Sunday69%7.7% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft64%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion4%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather63%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion13%
- Security0%
JAX to SJU: common questions
- How often are JAX to SJU flights on time?
- 72% 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 Jacksonville to San Juan cancelled?
- 3.1% of scheduled flights were cancelled (8 of 261).
- How long are typical delays?
- Across all flights the average arrival delay was 28 min (early arrivals count as zero). Flights that were late arrived 95 min behind schedule on average, and 9.1% of flights were an hour or more late.
- How long is taxi time at JAX?
- Flights on this route spent 15 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SJU to JAX — 79% on time
More flights from Jacksonville
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: JAX → SJU, nonstop flights by US airlines that report to the DOT. How we calculate this.