Route profile
BOS→CHS
Flight reliability, delays and best times to fly from Boston to Charleston, 818 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 29% of comparable major US routes (4,598 compared)
Calculated from 3,675 flights. How this is calculated · What counts as on time
BOS → CHS arrives on time 76.2% of the time; the return trip, CHS → BOS, arrives on time 71.8% of the time, a 4.4-point gap between the two directions of the same city pair.
BOS → CHS spends 28.7 minutes on the ground on an 818-mile trip: 20.0 minutes from pushback to wheels-up at BOS and 8.7 minutes from touchdown to gate at CHS.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
This route holds up about the same all year, a steadier seasonal pattern than 92% of 3,357 comparable routes.
80.6% on time in its best month (May) against 69.7% in its worst (December).
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 3,357 in the comparison.
What sets this route apart
Where BOS to CHS differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
BOS to CHS struggles most at 10 AM: 70.7% of its flights scheduled then arrive on time, 13 points behind the 83.7% on routes of similar length at the same hour. Against all other routes the gap is 12 points.
BOS to CHS is at its best against routes of similar length for flights scheduled at 1 PM: 84.6% arrive on time, 7.1 points ahead of the 77.5% those routes manage at that hour. Against all other routes the gap is 7.5 points.
Friday is the day BOS to CHS slips furthest against routes of similar length, 71.1% on time where they average 75.9%, 4.8 points lower. Against all other routes the gap is 5.1 points.
In September, BOS to CHS runs 11.6 points below routes of similar length, 70.9% on time to 82.5%. Against all other routes the gap is 11.5 points.
June is kinder to BOS to CHS than to routes of similar length: 79.7% on time against 71.8%, 7.9 points better. Against all other routes the gap is 7 points.
BOS to CHS against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 10 AM departures | 70.7% | routes of similar length | 83.7% | −13.0 pts | 368 here, 139,168 there |
| Hour: 1 PM departures | 84.6% | routes of similar length | 77.5% | +7.1 pts | 188 here, 134,945 there |
| Weekday: Friday | 71.1% | routes of similar length | 75.9% | −4.8 pts | 508 here, 340,827 there |
| Month: September | 70.9% | routes of similar length | 82.5% | −11.6 pts | 309 here, 180,584 there |
| Month: June | 79.7% | routes of similar length | 71.8% | +7.9 pts | 330 here, 188,938 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 818 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
Why BOS → CHS flights are cancelled
July 2023 – July 2026
BOS → CHS cancelled 66 of 3,675 scheduled flights — about 1 in every 56. The reason filed most often was extreme weather, 50.0% of the cancellations coded on this route — about 1 in every 111 scheduled flights.
Share of cancellations
Of 66 cancelled departures carrying a reason code.
What each reason means
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
33 cancellations, 50.0% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
22 cancellations, 33.3% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
11 cancellations, 16.7% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
66 coded cancellations were recorded on BOS → CHS; the section appears from 50.
When it goes wrong
July 2023 – July 2026
54 min late
against a median of 6 min early
BOS → CHS has an average that understates its risk: a typical arrival is 6 min early, but the worst tenth are 60 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 3,675 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at CHS after arriving from BOS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 38% | Likely to miss |
| 45 min | 23% | High risk |
| 60 min | 15% | High risk |
| 90 min | 9.2% | Some risk |
| 120 min | 5.5% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.80% of the time and diverts 0.41% of the time, which a late arrival never shows up in.
Chance of missing is the share of 3,594 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 54 minutes late (90th-percentile gate arrival delay), over 3,675 operations.
Any other layover length: connection checker.
Best time to fly
BOS → CHS flights departing 5–9 AM arrived on time 84.2% of the time, against 63.4% for 3–6 PM departures, a gap of 20.8 percentage points.
By departure window
By departure hour
- 12 AM to 5 AM: too few flights to score
- 6 AM: 91.1% on time from 172 flights
- 7 AM: 76.4% on time from 222 flights
- 8 AM: 85.7% on time from 373 flights
- 9 AM: 79.9% on time from 360 flights
- 10 AM: 70.7% on time from 373 flights
- 11 AM: 83.5% on time from 333 flights
- 12 PM: 77.7% on time from 714 flights
- 1 PM: 84.6% on time from 190 flights
- 2 PM: too few flights to score
- 3 PM: 70.6% on time from 129 flights
- 4 PM: 63.5% on time from 308 flights
- 5 PM: 59.5% on time from 251 flights
- 6 PM: 66.4% on time from 130 flights
- 7 PM to 11 PM: too few flights to score
Why BOS → CHS runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for BOS → CHS. Only delays of 15 minutes or more are attributed. What the five causes mean
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| JetBlue | 2,071 | 73.3% | 1.64% | -4 min | 9.9% |
| Delta Air Lines | 1,218 | 80.2% | 2.05% | -9 min | 8.1% |
| Spirit Airlines | 210 | 74.5% | 2.38% | -9 min | 12.3% |
JetBlue flew 59.2% of the 3,499 flights listed.
Delta Air Lines arrived on time 6.9 percentage points more often than JetBlue on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Friday the least, a gap of 10.2 percentage points.
By month
- Jan: 77.1%
- Feb: 77.5%
- Mar: 79.9%
- Apr: 79.2%
- May: 80.6%
- Jun: 79.7%
- Jul: 70.6%
- Aug: 71.8%
- Sep: 70.9%
- Oct: 79.9%
- Nov: 78.1%
- Dec: 69.7%
December is historically the weakest month and May the strongest, a spread of 10.9 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: too few flights to score (99)
- August 2023: too few flights to score (96)
- September 2023: too few flights to score (98)
- October 2023: too few flights to score (98)
- November 2023: too few flights to score (74)
- December 2023: too few flights to score (79)
- January 2024: too few flights to score (62)
- February 2024: too few flights to score (73)
- March 2024: too few flights to score (93)
- April 2024: too few flights to score (111)
- May 2024: 78.4% from 150 flights
- June 2024: 85.2% from 136 flights
- July 2024: 70.4% from 121 flights
- August 2024: 66.1% from 132 flights
- September 2024: 75.4% from 120 flights
- October 2024: too few flights to score (96)
- November 2024: too few flights to score (74)
- December 2024: too few flights to score (92)
- January 2025: too few flights to score (73)
- February 2025: too few flights to score (79)
- March 2025: 76.9% from 121 flights
- April 2025: 78.7% from 151 flights
- May 2025: 78.2% from 120 flights
- June 2025: too few flights to score (94)
- July 2025: too few flights to score (93)
- August 2025: too few flights to score (94)
- September 2025: too few flights to score (98)
- October 2025: too few flights to score (99)
- November 2025: too few flights to score (93)
- December 2025: too few flights to score (99)
- January 2026: too few flights to score (68)
- February 2026: too few flights to score (57)
- March 2026: too few flights to score (88)
- April 2026: too few flights to score (113)
- May 2026: 85.5% from 124 flights
- June 2026: too few flights to score (104)
- July 2026: too few flights to score (103)
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 77.6% against 74.5% in the 12 months before — improving by 3.1 percentage points.
Data and methodology
Calculated by FlyerIntel from 3,675 BOS → CHS flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed