72% of flights from Boston to Jacksonville arrived on time over the past 12 months. That is worse than the typical U.S. route. The 6 a.m. departures ran on time 85% of the time; the 4 p.m. ones 54%. Most reliable airline: JetBlue (73%). 13% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for BOS → JAX: when a flight was late, it was under 45 minutes late 47% of the time. About 1 in 10 flights landed an hour or more late, and 1 in 71 three hours or more; 2.9% were cancelled outright.
- On time or early72%
- 15–30 min late7.6%
- 30–60 min late7.6%
- 1–2 hours late6.3%
- 2–3 hours late2.1%
- 3+ hours late1.4%
- Diverted0.2%
- Cancelled2.9%
Share of all 1,625 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Delta Air Lines | 960 | 71% | 2.3% | −6 min | 10.1% | +65 min | Republic Airways 93%, Delta Air Lines 7% |
| JetBlue | 665 | 73% | 3.8% | −8 min | 9.3% | +71 min | JetBlue |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at BOS). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Delta Air Lines | JetBlue |
|---|---|---|
| 6 a.m. | — | 85% |
| 7 a.m. | — | 84% |
| 8 a.m. | 82% | — |
| 9 a.m. | 80% | — |
| 3 p.m. | 69% | — |
| 7 p.m. | 60% | — |
| 8 p.m. | 65% | — |
Last flight of the day
On BOS → JAX, each airline's last flight of the day was cancelled 4.3% of the time, against 1.8% for its earlier flights (2.4× as often). It arrived 3+ hours late 2.4% of the time (earlier flights: 0.7%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| JetBlue | 5:08 p.m. | 4.5% | 3.0% | 3.0% | first flight 7:05 a.m. |
| Delta Air Lines | 8:30 p.m. | 4.1% | 1.9% | 1.2% | first flight 8:50 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in JAX tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: November (82%). Worst: July (64%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 251 | 69% | 6.0% |
| Tuesday | 231 | 74% | 4.8% |
| Wednesday | 227 | 77% | 0.9% |
| Thursday | 238 | 70% | 2.1% |
| Friday | 238 | 71% | 0.8% |
| Saturday | 195 | 76% | 2.6% |
| Sunday | 245 | 67% | 2.9% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 16 · weather 16 · air traffic/airport 15
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| B6 109 | 7:00 a.m. | 363 | 81% | 3.6% | −13 min | JetBlue |
| DL 5597 | 8:45 a.m. | 175 | 82% | 0.0% | −8 min | Republic Airways |
| DL 5657 | 3:35 p.m. | 191 | 70% | 1.6% | −6 min | Republic Airways |
| DL 5593 | 8:25 p.m. | 157 | 66% | 3.8% | −4 min | Republic Airways |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Dec 27, 2025 | 5 | 0% | 1 |
| Jul 21, 2026 | 5 | 0% | 4 |
| Dec 14, 2025 | 5 | 0% | 0 |
| Aug 3, 2026 | 5 | 0% | 1 |
| Nov 10, 2025 | 5 | 0% | 0 |
Questions
How often are flights from BOS to JAX on time?
72% of 1,625 scheduled flights from Boston, MA to Jacksonville, FL arrived within 15 minutes of schedule between September 2025 and August 2026. 2.9% were cancelled.
What is the best time of day to fly BOS to JAX?
Flights scheduled to leave at 6 a.m. were the most reliable (85% on time). The 4 p.m. departures were the least (54%).
Which airline is most on time from BOS to JAX?
JetBlue: 73% of its 665 flights on the route arrived on time. Delta Air Lines: 71%.
What month has the most delays from BOS to JAX?
July (64% on time). The best month is November (82%), over 2023–2026.
Is the last flight of the day from BOS to JAX more likely to be cancelled?
Yes. Each airline's last BOS–JAX flight of the day was cancelled 4.3% of the time over the past year, against 1.8% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- JAX → BOS (return)
- Boston Logan (BOS) delays by hour
- Flights into Jacksonville (JAX)
- Delta Air Lines on-time record
- JetBlue on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.