Carrier route record
YXJAX→BOS
Republic Airways · Jacksonville to Boston
- Flights
- 895
- Period
- July 2025 to June 2026
- Share of route
- 56%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on JAX to BOS lands a B, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 895 flights, with a median arrival 8 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on JAX to BOS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.9%
Arrivals under 15 minutes late, of 879 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
1.68%
National rate is 1.81%
Whole route
74.4%
Every carrier on JAX to BOS, 1,609 flights
These figures cover 895 flights between July 2025 and June 2026. Beyond the headline rate, 8.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Republic against every carrier on JAX to BOS
Republic flew 895 of the 1,609 flights on JAX to BOS, most of the route. Its 77.9% on time is 4 points better than the route as a whole, which runs 74.4%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Delta at 85.2% to JetBlue at 68.7%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 56 | 85.2% | 71 min | 3.57% | A− |
| Republic Airways (this page) | 895 | 77.9% | 88 min | 1.68% | B |
| JetBlue Airways | 658 | 68.7% | 71 min | 3.04% | C− |
Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 28 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am345 flights89.0%
- 8am–11am23 flights—
- 11am–2pm290 flights70.5%
- 2pm–5pm12 flights—
- 5pm–8pm178 flights72.0%
- 8pm–5am47 flights61.4%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 61.4% on time, against 89.0% 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 5am–8am window is the busiest, with 345 flights scheduled in it.
Across the year
Republic on JAX to BOS through the year
Delays peak in October, when the on-time rate falls to 60.2%. August is the strongest month at 88.6%. Moving a flexible trip across that boundary buys 28 points. December was the busiest month here, with 88 flights.
Across the week, Saturday is the strongest day at 88.5% on time and Thursday the weakest at 71.2%. 17 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Republic runs late on this route
One category carries most of the weight here. Carrier accounts for 48% of the 17,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 48%Carrier
- 36%National Airspace System
- 15%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 8,138 of the 17,000 delay minutes reported here. The split is drawn from 17,096 reported delay minutes.
36% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 6,074 minutes out of 17,000, against a national NAS share of 21%.
Cancellations sit at 1.68% against a national 1.81%, which is ordinary. Diversions add another 0.11%.
Connections and stage length
What a delay here costs
8.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 74.4% on time across 892 flights, 4 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
One caution: this is a thin sample. 895 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Republic on JAX to BOS
Put together: treat all of this as provisional. 895 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 77.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 879 completed flights over 12 months sit behind that.
Related
Where to go next
- JAX to BOS, every carrier
- Republic on BOS to JAX, the return leg
- JetBlue Airways on JAX to BOS68.7%
- Republic Airways network-wide record
- Boston Logan International (BOS) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.