Route reliability record
BOS→JAX
Boston to Jacksonville
- Flights
- 1,625
- Period
- September 2025 to August 2026
- Distance
- 1,011 mi
- Carriers
- 3
This route sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 1,625 BOS to JAX flights, of which JetBlue Airways flew 665 at 75.9% on time.
Best time to fly BOS to JAX: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 86.9% of the time and Saturday flights 78.4%, against 74.3% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
74.3%
Arrivals under 15 minutes late, of 1,574 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
2.89%
National rate is 1.89%
Best carrier
JetBlue
75.9% on time across 665 flights
These figures cover 1,625 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on BOS to JAX
The two carriers here are closely matched: 3 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 66 | 82.5% | 76 min | 4.55% | B− |
| JetBlue Airways | 665 | 75.9% | 71 min | 3.76% | B− |
| Republic Airways | 894 | 72.5% | 65 min | 2.13% | C |
JetBlue Airways cancels 3.8% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Flight by flight
Flights on BOS to JAX
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Boston to Jacksonville
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. BOS → JAXBoston to Jacksonville | JetBlue Airways | 73.0% | 75.9% | 3.76% | 5am–8am, Sat | B6 109 07:00 |
| 2. BOS → JAXBoston to Jacksonville | Republic Airways | 71.0% | 72.5% | 2.13% | 8am–11am, Wed | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against 3 points between the best and worst carrier.
- 5am–8am268 flights86.9%
- 8am–11am454 flights81.6%
- 11am–2pm25 flights—
- 2pm–5pm457 flights69.1%
- 5pm–8pm245 flights63.5%
- 8pm–5am176 flights66.1%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 63.5% on time, against 86.9% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 457 flights scheduled in it.
Explore
Filter BOS to JAX by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On BOS to JAX, the best departure window is 5am–8am at 86.9% on time and the worst is 5pm–8pm at 63.5%, a wide gap of 23.4 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am86.9%
- 8–11am81.6%
- 11am–2pm—
- 2–5pm69.1%
- 5–8pm63.5%
- 8pm–5am66.1%
best all US flightsScale 55% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 16 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 66.7% on time, 16 points below May, the best at 82.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. May was the busiest month here, with 160 flights.
Across the week, Saturday is the strongest day at 78.4% on time and Sunday the weakest at 69.9%, a spread of 9 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 27,000 reported delay minutes.
- 41%Late-arriving aircraft
- 32%Carrier
- 25%National Airspace System
- 2%Extreme weather
- 0%Security
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 27,000 reported delay minutes here, that single category outweighs weather by 23 to one. The split is drawn from 27,327 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 86.9% on time here.
Cancellations run at 2.89%, against 1.89% nationally. That is roughly one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here actually costs
10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,011 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 73.4% on time across 1,628 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,625 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in JAX after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 2.89% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,574 completed flights over 12 months sit behind that.
Common questions
BOS to JAX questions
How often is BOS to JAX delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.7% of the 1,625 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on BOS to JAX?
JetBlue Airways leads at 75.9% on time across 665 flights. Republic Airways is at the other end on 72.5%, a gap of 3 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on BOS to JAX?
The 5am–8am departure window is the strongest at 86.9% on time. The 5pm–8pm window is the weakest at 63.5%, 23 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on BOS to JAX?
July is the weakest month at 66.7% on time, compared with 82.5% in May. Across the year that is 16 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- JAX to BOS — the return legseparate record
- Boston Logan International (BOS) delay statistics
- Jacksonville International (JAX) delay statistics
- JetBlue Airways on BOS to JAX75.9%
- Republic Airways on BOS to JAX72.5%
- BOS to DCA, a related route72.6%
- ATL to JAX, a related route75.1%
- BOS to ORD, a related route71.9%
- Delta Air Lines on-time record82.5%
- JetBlue Airways on-time record75.9%
- Republic Airways on-time record72.5%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. BOS to JAX and JAX to BOS are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.