Carrier route record
DLCHS→BOS
Delta Air Lines · Charleston to Boston
- Flights
- 370
- Period
- September 2025 to August 2026
- Share of route
- 32%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on CHS to BOS draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 370 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so Delta on CHS to BOS runs 12 points behind the country as a whole. Across a thousand flights that is about 119 extra late arrivals.
Key figures
On time
65.4%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
112 min
Across delayed arrivals only, not all flights
Cancelled
3.78%
National rate is 1.89%
Whole route
69.5%
Every carrier on CHS to BOS, 1,150 flights
These figures cover 370 flights between September 2025 and August 2026. Beyond the headline rate, 16.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Delta against every carrier on CHS to BOS
Delta flew 370 of the 1,150 flights on CHS to BOS, about 32% of it. Its 65.4% on time is 4 points worse than the route as a whole, which runs 69.5%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Republic at 84.1% to Delta at 65.4%. 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 | 110 | 84.1% | 88 min | 2.73% | B |
| JetBlue Airways | 670 | 69.4% | 81 min | 2.84% | C |
| Delta Air Lines (this page) | 370 | 65.4% | 112 min | 3.78% | C− |
Flight by flight
Delta flight numbers on CHS to BOS
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Delta runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 12 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am—
- 11am–2pm34 flights75.8%
- 2pm–5pm331 flights64.2%
- 5pm–8pm5 flights—
- 8pm–5am—
Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 75.8% on time, ahead of 2pm–5pm at 64.2%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 2pm–5pm window is the busiest, with 331 flights scheduled in it.
Across the year
Delta on CHS to BOS through the year
- Jul–Sep 202538 flights42.1%
- Oct–Dec 202592 flights61.5%
- Jan–Mar 202677 flights78.3%
- Apr–Jun 2026101 flights75.0%
- Jul–Sep 202662 flights55.2%
Scale runs 35% to 85%.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 65.4% on time across 370 flights.
Delta on CHS to BOS did not run the same all year. Its best quarter was Jan–Mar 2026 at 78.3% on time and its weakest Jul–Sep 2025 at 42.1%, a swing of 36 points on roughly 74 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Saturday is the strongest day at 73.3% on time and Sunday the weakest at 56.6%, a spread of 17 points.
Arrival by arrival
How late Delta on CHS to BOS runs when it is late
Delta on CHS to BOS often beats the schedule: 100 of 356 completed flights, 28%, arrived 15 minutes or more early. The 123 late arrivals split 30 under half an hour, 36 between 30 and 60 minutes, and 57 an hour or more.
- 15+ min early100 flights28.1%
- Within 15 min133 flights37.4%
- 15–29 min late30 flights8.4%
- 30–59 min late36 flights10.1%
- 1–2 hours late37 flights10.4%
- 2+ hours late20 flights5.6%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 122 departures that left 15 minutes late or more, only 14 made it up before arrival. 15 flights left on time and still arrived late.
The worst days
Worst days for Delta on CHS to BOS
The latest arrival of the period was on 15 April 2026, 18 hours 18 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 April 2026 | 18 hours 18 minutes | Carrier |
| 10 July 2026 | 16 hours 59 minutes | Carrier |
| 18 July 2026 | 16 hours 41 minutes | Carrier |
| 22 August 2026 | 16 hours 41 minutes | Carrier |
| 30 November 2025 | 16 hours 30 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 48% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 26%Late-arriving aircraft
- 25%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,598 of the 14,000 delay minutes reported here. The split is drawn from 13,791 reported delay minutes.
Cancellations run at 3.78%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
16.0% 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 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.
The return leg is a different operation and performs like one: it runs 76.2% on time across 370 flights, 11 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 11 points of difference.
One caution: this is a thin sample. 370 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 Delta on CHS to BOS
Put together: the delay figures matter less here than the 3.78% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 356 completed flights over 12 months sit behind that.
Related
Where to go next
- CHS to BOS, every carrier
- Delta on BOS to CHS, the return leg
- Republic Airways on CHS to BOS84.1%
- JetBlue Airways on CHS to BOS69.4%
- Delta Air Lines network-wide record
- Charleston International (CHS) delay statistics
- Boston Logan International (BOS) delay statistics
- The US routes with the most cancellations
- The best time of day to fly, according to 7.05 million flight records
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.