Carrier route record
B6BOS→CHS
JetBlue Airways · Boston to Charleston
- Flights
- 651
- Period
- July 2025 to June 2026
- Share of route
- 58%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on BOS to CHS sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 651 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate JetBlue on BOS to CHS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.8%
Arrivals under 15 minutes late, of 637 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
1.69%
National rate is 1.81%
Whole route
77.2%
Every carrier on BOS to CHS, 1,130 flights
These figures cover 651 flights between July 2025 and June 2026. Beyond the headline rate, 9.3% 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
JetBlue against every carrier on BOS to CHS
JetBlue flew 651 of the 1,130 flights on BOS to CHS, most of the route. Its 75.8% on time is about level with the route as a whole at 77.2%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Republic at 84.3% to JetBlue at 75.8%. 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 |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 89 | 84.3% | 58 min | 0.00% | B+ |
| Delta Air Lines | 390 | 78.0% | 73 min | 2.31% | B |
| JetBlue Airways (this page) | 651 | 75.8% | 66 min | 1.69% | B |
Flight by flight
JetBlue flight numbers on BOS to CHS
Departure window
When JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 32 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–8am133 flights84.6%
- 8am–11am225 flights83.3%
- 11am–2pm78 flights83.3%
- 2pm–5pm99 flights67.3%
- 5pm–8pm116 flights52.7%
- 8pm–5am—
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 52.7% on time, against 84.6% 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 8am–11am window is the busiest, with 225 flights scheduled in it.
Across the year
JetBlue on BOS to CHS through the year
December is the weak month at 58.1% on time, against 86.7% in October. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. May was the busiest month here, with 84 flights.
Across the week, Tuesday is the strongest day at 84.4% on time and Sunday the weakest at 70.1%. 14 points is a smaller lever than departure hour, but it is free.
Delay causes
Why JetBlue runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 10,000 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.
- 43%Late-arriving aircraft
- 30%Carrier
- 23%National Airspace System
- 4%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 10,000 reported delay minutes here, that single category outweighs weather by 12 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 10,124 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 84.6% on time here.
Cancellations sit at 1.69% against a national 1.81%, which is ordinary. Diversions add another 0.46%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.3% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 818 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 71.2% on time across 651 flights, 5 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 5 points of difference.
One caution: this is a thin sample. 651 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 JetBlue on BOS to CHS
Put together: treat all of this as provisional. 651 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 75.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 637 completed flights over 12 months sit behind that.
Related
Where to go next
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.