Route reliability record
CLT→BOS
Charlotte to Boston
- Flights
- 4,006
- Period
- September 2025 to August 2026
- Distance
- 728 mi
- Carriers
- 4
This route lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 4,006 CLT to BOS flights, of which Republic Airways flew 1,214 at 80.8% on time.
Best time to fly CLT to BOS: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 91.7% of the time and Saturday flights 79.9%, against 76.0% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.0%
Arrivals under 15 minutes late, of 3,904 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
2.47%
National rate is 1.89%
Best carrier
Republic
80.8% on time across 1,214 flights
These figures cover 4,006 flights between September 2025 and August 2026. Beyond the headline rate, 9.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Which airline is most reliable on CLT to BOS
The choice of carrier is not cosmetic here. Republic Airways arrives on time 80.8% of the time; American Airlines manages 74.1%. Sample sizes sit next to every figure, because a two-point gap across 2,726 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways | 1,214 | 80.8% | 76 min | 3.13% | B− |
| American Airlines | 2,726 | 74.1% | 66 min | 2.13% | C |
| Spirit Airlinesthin sample | 61 | 70.0% | 94 min | 1.64% | C |
| Envoy Airthin sample | 5 | 66.7% | 144 min | 40.00% | C− |
Republic Airways cancels 3.1% 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.
Flight by flight
Flights on CLT to BOS
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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.
Best ways to make this trip
The most reliable ways to fly Charlotte to Boston
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. CLT → BOSCharlotte to Boston | Republic Airways | 78.3% | 80.8% | 3.13% | 5am–8am, Sat | YX 5648 06:00 |
| 2. CLT → PVDCharlotte to Providence | American Airlines | 77.8% | 79.4% | 1.96% | 5am–8am, Tue | — |
| 3. CLT → MHTCharlotte to Manchester | PSA Airlines | 75.0% | 77.4% | 3.07% | 8am–11am, Wed | — |
| 4. CLT → BOSCharlotte to Boston | American Airlines | 72.5% | 74.1% | 2.13% | 5am–8am, Wed | AA 1843 22:29 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 29 points, against 7 points between the best and worst carrier.
- 5am–8am540 flights91.7%
- 8am–11am731 flights89.5%
- 11am–2pm830 flights78.0%
- 2pm–5pm575 flights65.2%
- 5pm–8pm923 flights62.7%
- 8pm–5am407 flights72.1%
Scale runs 55% to 95%.
The 5pm–8pm window is where this operation falls apart: 62.7% on time, against 91.7% 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 5pm–8pm window is the busiest, with 923 flights scheduled in it.
Explore
Filter CLT to BOS by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On CLT to BOS, the best departure window is 5am–8am at 91.7% on time and the worst is 5pm–8pm at 62.7%, a wide gap of 29.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am91.7%
- 8–11am89.5%
- 11am–2pm78.0%
- 2–5pm65.2%
- 5–8pm62.7%
- 8pm–5am72.1%
best all US flightsScale 55% to 95%.
Across the year
When delays peak on this route
This route's year swings by 24 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
November is the best month on the calendar at 83.7% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. October was the busiest month here, with 370 flights.
Across the week, Saturday is the strongest day at 79.9% on time and Sunday the weakest at 71.4%, a spread of 9 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 65,000 reported delay minutes.
- 38%Late-arriving aircraft
- 31%National Airspace System
- 25%Carrier
- 6%Extreme weather
- 0%Security
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 65,000 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 64,634 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 91.7% on time here.
Cancellations sit at 2.47% against a national 1.89%, which is ordinary. Diversions add another 0.07%.
Connections and stage length
What a delay here actually costs
9.6% 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 728 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 82.0% on time across 4,009 flights, 6 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 6 points of difference.
The sample behind these figures is 4,006 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in BOS after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. November runs 83.7% on time and September 60.1%, a swing of 24 points. If the dates move at all, move them out of September before you think about anything else. 3,904 completed flights over 12 months sit behind that.
Common questions
CLT to BOS questions
How often is CLT to BOS delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 24.0% of the 4,006 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on CLT to BOS?
Republic Airways leads at 80.8% on time across 1,214 flights. American Airlines is at the other end on 74.1%, a gap of 7 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on CLT to BOS?
The 5am–8am departure window is the strongest at 91.7% on time. The 5pm–8pm window is the weakest at 62.7%, 29 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are September delays on CLT to BOS?
September is the weakest month at 60.1% on time, compared with 83.7% in November. Across the year that is 24 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- BOS to CLT — the return legseparate record
- Charlotte Douglas International (CLT) delay statistics
- Boston Logan International (BOS) delay statistics
- Republic Airways on CLT to BOS80.8%
- American Airlines on CLT to BOS74.1%
- CLT to MCO, a related route71.6%
- DCA to BOS, a related route70.1%
- CLT to ORD, a related route72.4%
- Republic Airways on-time record80.8%
- American Airlines on-time record74.1%
- Spirit Airlines on-time record70.0%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. CLT to BOS and BOS to CLT are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed CLT to BOS’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.