Carrier performance at one airport
AA→BOS
American Airlines at Boston Logan International
- Departures
- 17,138
- Period
- September 2025 to August 2026
- Routes
- 9
- Rank here
- #3 of 11
American Airlines at Boston lands a B, about a point better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 17,138 flights, of which Allegiant Air flew 586 at 82.1% on time.
Measured against the airport rather than the country, American Airlines runs 4 points ahead of the 74.6% weighted average across all carriers at BOS. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
78.2%
16,642 completed departures
Avg delay
93 min
Across delayed flights only
Cancelled
2.54%
At BOS, this carrier only
Rank here
#3
Of 11 carriers clearing the floor at BOS
These figures cover 17,000 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Against the competition
Every carrier at BOS, ranked
The choice of carrier is not cosmetic here. Allegiant Air arrives on time 82.1% of the time; Spirit Airlines manages 61.6%. Sample sizes sit next to every figure, because a two-point gap across 1,737 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Allegiant Air | 586 | 82.1% | 79 min | 0.68% | B+ |
| Envoy Air | 2,055 | 79.1% | 86 min | 2.29% | B |
| American Airlines (this page) | 17,138 | 78.2% | 93 min | 2.54% | B |
| United Airlines | 13,042 | 77.7% | 78 min | 1.92% | B |
| Republic Airways | 34,798 | 77.2% | 68 min | 4.38% | B− |
| Delta Air Lines | 26,567 | 76.0% | 73 min | 2.16% | B |
| Alaska Airlines | 2,420 | 71.4% | 57 min | 1.36% | C |
| JetBlue Airways | 37,517 | 70.1% | 71 min | 3.41% | C− |
| Southwest Airlines | 7,340 | 69.3% | 62 min | 1.66% | C |
| Frontier Airlines | 926 | 68.0% | 65 min | 1.84% | C |
| Spirit Airlines | 1,737 | 61.6% | 80 min | 5.87% | D− |
Spirit Airlines cancels 5.9% 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.
Route by route
Where American Airlines flies from BOS
American Airlines operates 9 routes out of BOS with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| BOS to CLT · Charlotte | 2,728 | 83.3% | 88 min | 2.20% | B |
| BOS to DFW · Dallas-Fort Worth | 2,653 | 78.8% | 94 min | 3.32% | B− |
| BOS to PHL · Philadelphia | 2,288 | 76.2% | 111 min | 2.84% | B |
| BOS to MIA · Miami | 2,271 | 82.3% | 77 min | 1.72% | B |
| BOS to DCA · Washington | 2,231 | 75.1% | 88 min | 3.27% | B− |
| BOS to ORD · Chicago | 2,165 | 73.3% | 98 min | 2.86% | C |
| BOS to PHX · Phoenix | 1,310 | 80.0% | 80 min | 1.60% | B |
| BOS to LAX · Los Angeles | 1,183 | 73.6% | 96 min | 1.61% | C |
| BOS to MCO · Orlandothin sample | 284 | 80.7% | 109 min | 2.82% | B |
Flight by flight
American Airlines flight numbers from BOS
4 American Airlines flight numbers leaving BOS flew their main route often enough to have a record of their own. Grouped by destination.
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 35 points, against 20 points between the best and worst carrier.
- 5am–8am4,282 flights91.6%
- 8am–11am4,030 flights84.1%
- 11am–2pm2,896 flights78.4%
- 2pm–5pm2,353 flights68.3%
- 5pm–8pm3,274 flights62.0%
- 8pm–5am303 flights56.1%
Scale runs 50% to 95%.
The 8pm–5am window is where this operation falls apart: 56.1% on time, against 91.6% 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 5am–8am window is the busiest, with 4,282 flights scheduled in it.
Across the year
Seasonal pattern
April is the best month on the calendar at 83.0% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 1,628 flights.
Delay causes
What holds this operation up
- 48%Late-arriving aircraft
- 30%Carrier
- 18%National Airspace System
- 3%Extreme weather
- 0%Security
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 337,000 reported delay minutes here, that single category outweighs weather by 15 to one. The split is drawn from 337,089 reported delay minutes.
Cancellations run at 2.54%, against 1.89% nationally. That is about one flight in 40 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.
9.4% 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.
17,138 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
Put together: avoid the 8pm–5am departure. It runs 56.1% on time against 91.6% for the 5am–8am slot, and that 35 points is the largest single thing you control here. Allegiant Air is the strongest operator if the fares are close. 16,642 completed flights over 12 months sit behind that.
Common questions
American Airlines at BOS
How often is American Airlines at BOS delayed?
Roughly one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 21.8% of the 17,138 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
Which airline is most reliable on American Airlines at BOS?
Allegiant Air leads at 82.1% on time across 586 flights. Spirit Airlines is at the other end on 61.6%, a gap of 20 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 American Airlines at BOS?
The 5am–8am departure window is the strongest at 91.6% on time. The 8pm–5am window is the weakest at 56.1%, 35 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 October delays on American Airlines at BOS?
October is the weakest month at 72.8% on time, compared with 83.0% in April. Across the year that is 10 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
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.