Carrier route record
AACLT→BOS
American Airlines · Charlotte to Boston
- Flights
- 2,726
- Period
- September 2025 to August 2026
- Share of route
- 68%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with American Airlines.
American on CLT to BOS sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 2,726 flights, with a median arrival 6 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate American on CLT to BOS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
74.1%
Arrivals under 15 minutes late, of 2,667 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
2.13%
National rate is 1.89%
Whole route
76.0%
Every carrier on CLT to BOS, 4,006 flights
These figures cover 2,726 flights between September 2025 and August 2026. Beyond the headline rate, 9.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
American against every carrier on CLT to BOS
American flew 2,726 of the 4,006 flights on CLT to BOS, most of the route. Its 74.1% on time is 2 points worse than the route as a whole, which runs 76.0%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from Republic at 80.8% to Envoy at 66.7%. Two 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 Airways | 1,214 | 80.8% | 76 min | 3.13% | B− |
| American Airlines (this page) | 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− |
Flight by flight
American flight numbers on CLT to BOS
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Departure window
When American runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 28 points, against half a point between the best and worst carrier.
- 5am–8am180 flights90.0%
- 8am–11am508 flights89.9%
- 11am–2pm620 flights76.7%
- 2pm–5pm400 flights63.2%
- 5pm–8pm611 flights61.8%
- 8pm–5am407 flights72.1%
Scale runs 55% to 95%.
The 5pm–8pm window is where this operation falls apart: 61.8% on time, against 90.0% 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 620 flights scheduled in it.
Across the year
American on CLT to BOS through the year
Delays peak in September, when the on-time rate falls to 62.4%. January is the strongest month at 82.4%. Moving a flexible trip across that boundary buys 20 points. July was the busiest month here, with 243 flights.
Across the week, Wednesday is the strongest day at 77.7% on time and Monday the weakest at 69.2%, a spread of 9 points.
Arrival by arrival
How late American on CLT to BOS runs when it is late
American on CLT to BOS often beats the schedule: 776 of 2,667 completed flights, 29%, arrived 15 minutes or more early. The 692 late arrivals split 198 under half an hour, 233 between 30 and 60 minutes, and 261 an hour or more.
- 15+ min early776 flights29.1%
- Within 15 min1,199 flights45.0%
- 15–29 min late198 flights7.4%
- 30–59 min late233 flights8.7%
- 1–2 hours late164 flights6.1%
- 2+ hours late97 flights3.6%
Scale runs 0% to 100%.
Share of 2,667 completed flights by arrival against schedule.
141 of 730 late departures made up the time and arrived on time, 19% of them. 103 flights left on time and still arrived late.
The worst days
Worst days for American on CLT to BOS
The latest arrival of the period was on 14 March 2026, 12 hours behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across March, January, October, July and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 March 2026 | 12 hours | Late-arriving aircraft |
| 18 January 2026 | 9 hours 10 minutes | Extreme weather |
| 2 October 2025 | 8 hours 16 minutes | Carrier |
| 18 July 2026 | 7 hours 31 minutes | National Airspace System |
| 23 August 2026 | 5 hours 38 minutes | Late-arriving aircraft |
Delay causes
Why American runs late on this route
Late-arriving aircraft accounts for 46% of the 46,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 26%National Airspace System
- 21%Carrier
- 7%Extreme weather
- 0%Security
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 46,000 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 45,683 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 90.0% on time here.
Cancellations sit at 2.13% against a national 1.89%, which is ordinary. Diversions add another 0.04%.
Connections and stage length
What a delay here costs
9.8% 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 83.3% on time across 2,728 flights, 9 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 9 points of difference.
The sample behind these figures is 2,726 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.
What to do with this
Booking American on CLT to BOS
Put together: the calendar is the biggest lever here, not the carrier or the hour. January runs 82.4% on time and September 62.4%, a swing of 20 points. If the dates move at all, move them out of September before you think about anything else. 2,667 completed flights over 12 months sit behind that.
Related
Where to go next
- CLT to BOS, every carrier
- American on BOS to CLT, the return leg
- Republic Airways on CLT to BOS80.8%
- American Airlines network-wide record
- Charlotte Douglas International (CLT) delay statistics
- Boston Logan International (BOS) delay statistics
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
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.