Carrier route record
YXBOS→CHS
Republic Airways · Boston to Charleston
- Flights
- 109
- Period
- September 2025 to August 2026
- Share of route
- 9%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Republic Airways.
Republic on BOS to CHS earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 109 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 370 at 76.2% on time.
Set against the rest of the country, Republic's BOS to CHS record is 8 points better than the US average of 77.3%. That gap is worth roughly 77 fewer late arrivals for every thousand flights.
Key figures
On time
85.0%
Arrivals under 15 minutes late, of 107 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
1.83%
National rate is 1.89%
Whole route
76.5%
Every carrier on BOS to CHS, 1,149 flights
These figures cover 109 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Republic against every carrier on BOS to CHS
Republic flew 109 of the 1,149 flights on BOS to CHS, about 9% of it. Its 85.0% on time is 9 points better than the route as a whole, which runs 76.5%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 85.0% to JetBlue at 75.3%.
The two carriers here are closely matched: about a point separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways (this page)thin sample | 109 | 85.0% | 54 min | 1.83% | A |
| Delta Air Lines | 370 | 76.2% | 71 min | 3.24% | B− |
| JetBlue Airways | 670 | 75.3% | 71 min | 2.54% | B |
Delta Air Lines cancels 3.2% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
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 Republic runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 109 flights.
There are not enough flights in each departure window to split Republic's BOS to CHS record by time of day without the percentages moving on noise. The headline rate of 85.0% is the reliable figure here.
Across the year
Republic on BOS to CHS through the year
- Oct–Dec 202543 flights76.7%
- Jan–Mar 202627 flights—
- Apr–Jun 202619 flights—
- Jul–Sep 202620 flights—
Scale runs 70% to 80%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 85.0% on time across 109 flights.
Split by quarter, Republic on BOS to CHS logged 43 flights in Oct–Dec 2025, 27 flights in Jan–Mar 2026, 19 flights in Apr–Jun 2026 and 20 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 85.0% annual figure is the one to use.
Across the week, Sunday is the strongest day at 92.3% on time and Saturday the weakest at 75.8%, a spread of 17 points.
Arrival by arrival
How late Republic on BOS to CHS runs when it is late
Republic on BOS to CHS often beats the schedule: 44 of 107 completed flights, 41%, arrived 15 minutes or more early. The 16 late arrivals split 6 under half an hour, 3 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early44 flights41.1%
- Within 15 min47 flights43.9%
- 15–29 min late6 flights5.6%
- 30–59 min late3 flights2.8%
- 1–2 hours late6 flights5.6%
- 2+ hours late1 flights0.9%
Scale runs 0% to 100%.
Share of 107 completed flights by arrival against schedule.
Only 12 of 107 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for Republic on BOS to CHS
The latest arrival of the period was on 30 December 2025, 2 hours 2 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 December 2025 | 2 hours 2 minutes | Carrier |
| 29 December 2025 | 1 hour 39 minutes | Late-arriving aircraft |
| 27 December 2025 | 1 hour 37 minutes | National Airspace System |
| 14 March 2026 | 1 hour 15 minutes | Carrier |
| 3 January 2026 | 1 hour 11 minutes | Carrier |
Delay causes
Why Republic runs late on this route
National Airspace System accounts for 52% of the 862 delay minutes carriers reported here, and the remaining four split what is left.
- 52%National Airspace System
- 25%Carrier
- 23%Late-arriving aircraft
- 0%Extreme weather
52% 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 449 minutes out of 862, against a national NAS share of 21%. The split is drawn from 862 reported delay minutes.
Cancellations sit at 1.83% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
6.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 55 minutes, which a normal layover absorbs.
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 runs 84.1% on time across 110 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 109 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 BOS to CHS
Put together: treat all of this as provisional. 109 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 85.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 107 completed flights over 12 months sit behind that.
Related
Where to go next
- BOS to CHS, every carrier
- Republic on CHS to BOS, the return leg
- Delta Air Lines on BOS to CHS76.2%
- JetBlue Airways on BOS to CHS75.3%
- Republic Airways network-wide record
- Boston Logan International (BOS) delay statistics
- Charleston International (CHS) delay statistics
- The best day of the week to fly, and why it is the second lever
- How to read this site: grades, sample sizes, and honest caveats
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.