Route reliability record
JAX→BOS
Jacksonville to Boston
- Flights
- 1,628
- 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, 4 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 1,628 JAX to BOS flights, of which Republic Airways flew 897 at 76.7% on time.
Best time to fly JAX to BOS: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 89.5% of the time and Saturday flights 82.7%, against 73.4% 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
73.4%
Arrivals under 15 minutes late, of 1,588 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
2.40%
National rate is 1.89%
Best carrier
Republic
76.7% on time across 897 flights
These figures cover 1,628 flights between September 2025 and August 2026. Beyond the headline rate, 11.2% 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 JAX to BOS
The choice of carrier is not cosmetic here. Republic Airways arrives on time 76.7% of the time; JetBlue Airways manages 68.2%. Sample sizes sit next to every figure, because a two-point gap across 665 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 66 | 81.0% | 151 min | 4.55% | B− |
| Republic Airways | 897 | 76.7% | 84 min | 1.34% | B |
| JetBlue Airways | 665 | 68.2% | 78 min | 3.61% | C− |
JetBlue Airways cancels 3.6% 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 JAX to BOS
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 Jacksonville to Boston
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. JAX → BOSJacksonville to Boston | Republic Airways | 75.7% | 76.7% | 1.34% | 5am–8am, Sat | — |
| 2. JAX → BOSJacksonville to Boston | JetBlue Airways | 65.7% | 68.2% | 3.61% | 5am–8am, Sat | B6 1310 12:00 |
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 34 points, against 9 points between the best and worst carrier.
- 5am–8am394 flights89.5%
- 8am–11am148 flights89.0%
- 11am–2pm578 flights68.2%
- 2pm–5pm7 flights—
- 5pm–8pm350 flights65.3%
- 8pm–5am151 flights56.0%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 56.0% on time, against 89.5% 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 11am–2pm window is the busiest, with 578 flights scheduled in it.
Explore
Filter JAX to BOS 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 JAX to BOS, the best departure window is 5am–8am at 89.5% on time and the worst is 8pm–5am at 56.0%, a wide gap of 33.5 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.5%
- 8–11am89.0%
- 11am–2pm68.2%
- 2–5pm—
- 5–8pm65.3%
- 8pm–5am56.0%
best all US flightsScale 50% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 35 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.
May is the best month on the calendar at 88.2% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. May was the busiest month here, with 161 flights.
Across the week, Saturday is the strongest day at 82.7% on time and Monday the weakest at 68.2%, a spread of 15 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 35,000 reported delay minutes.
- 35%Late-arriving aircraft
- 35%Carrier
- 29%National Airspace System
- 1%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 35,000 reported delay minutes here, that single category outweighs weather by 31 to one. The split is drawn from 35,175 reported delay minutes.
The largest share of delay minutes, 35%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 12,000 of the 35,000 delay minutes reported here.
Cancellations sit at 2.40% against a national 1.89%, which is ordinary. Diversions add another 0.06%.
Connections and stage length
What a delay here actually costs
11.2% 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 74.3% on time across 1,625 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 1,628 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 BOS after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 88.2% on time and September 53.7%, a swing of 35 points. If the dates move at all, move them out of September before you think about anything else. 1,588 completed flights over 12 months sit behind that.
Common questions
JAX to BOS questions
How often is JAX to BOS 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 26.6% of the 1,628 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
Which airline is most reliable on JAX to BOS?
Republic Airways leads at 76.7% on time across 897 flights. JetBlue Airways is at the other end on 68.2%, a gap of 9 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 JAX to BOS?
The 5am–8am departure window is the strongest at 89.5% on time. The 8pm–5am window is the weakest at 56.0%, 34 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 September delays on JAX to BOS?
September is the weakest month at 53.7% on time, compared with 88.2% in May. Across the year that is 35 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
- BOS to JAX — the return legseparate record
- Jacksonville International (JAX) delay statistics
- Boston Logan International (BOS) delay statistics
- Republic Airways on JAX to BOS76.7%
- JetBlue Airways on JAX to BOS68.2%
- JAX to ATL, a related route83.8%
- DCA to BOS, a related route70.1%
- JAX to ORD, a related route76.9%
- Delta Air Lines on-time record81.0%
- Republic Airways on-time record76.7%
- JetBlue Airways on-time record68.2%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. JAX to BOS and BOS to JAX 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.