Carrier route record
B6CHS→BOS
JetBlue Airways · Charleston to Boston
- 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 CHS to BOS sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 651 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.6%, so JetBlue on CHS to BOS runs 6 points behind the country as a whole. Across a thousand flights that is about 64 extra late arrivals.
Key figures
On time
71.2%
Arrivals under 15 minutes late, of 639 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
1.84%
National rate is 1.81%
Whole route
71.3%
Every carrier on CHS to BOS, 1,131 flights
These figures cover 651 flights between July 2025 and June 2026. Beyond the headline rate, 12.8% 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 CHS to BOS
JetBlue flew 651 of the 1,131 flights on CHS to BOS, most of the route. Its 71.2% on time is about level with the route as a whole at 71.3%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Republic at 84.3% to Delta at 68.3%. 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 | 90 | 84.3% | 90 min | 1.11% | B |
| JetBlue Airways (this page) | 651 | 71.2% | 77 min | 1.84% | C |
| Delta Air Lines | 390 | 68.3% | 90 min | 2.82% | C |
Flight by flight
JetBlue flight numbers on CHS to BOS
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–8am58 flights91.4%
- 8am–11am123 flights89.3%
- 11am–2pm239 flights65.7%
- 2pm–5pm66 flights60.6%
- 5pm–8pm79 flights66.7%
- 8pm–5am86 flights59.0%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 59.0% on time, against 91.4% 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 239 flights scheduled in it.
Across the year
JetBlue on CHS to BOS through the year
July is the worst month at 52.1% on time, 32 points below March, the best at 84.0%. 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 85 flights.
Across the week, Saturday is the strongest day at 81.1% on time and Sunday the weakest at 62.6%. 18 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 14,000 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
- 33%National Airspace System
- 24%Carrier
- 1%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 14,000 reported delay minutes here, that single category outweighs weather by 43 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 14,105 reported delay minutes.
33% 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 4,639 minutes out of 14,000, against a national NAS share of 21%.
Cancellations sit at 1.84% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
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. 12.8% 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 75.8% on time across 651 flights, 5 points above 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 CHS to BOS
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 71.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 639 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.