Airports › Boston (BOS) › May 2025
Airport month · May 2025
Logan International in May 2025
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In May 2025, reporting carriers scheduled 12,547 domestic departures from Logan International (BOS). 75.1% left less than 15 minutes late and 74.4% reached their destination on time; 0.8% were cancelled.
Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so BOS departures were 1.6 points below the national departure figure.
A year earlier, in May 2024, the airport had 12,659 departures with 77.2% leaving on time: a change of −2.1 points, with flights down 1%.
Flights arriving at BOS that month were on time 68.4% of the time (12,552 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 43%, national aviation system 29% and air carrier 25%.
- On time 74.4%
- Arrived 15+ minutes late 24.5%
- Cancelled 0.8%
- Diverted 0.3%
May 2025 against a year earlier, the airport's year and the nation
| Measure | May 2025 | May 2024 | BOS, 12 months to Jul 2026 | All reported flights, May 2025 |
|---|---|---|---|---|
| Departed on time | 75.1% | 77.2% | 74.4% | 76.7% |
| Arrived on time | 74.4% | 76.8% | 73.3% | 75.4% |
| Cancelled | 0.8% | 0.7% | 2.8% | 1.0% |
| Average departure delay (late minutes only) | 18.6 min | 17.1 min | 18.3 min | 17.5 min |
| Scheduled departures a day | 418 | 422 | 393 | 20,188 |
| Scheduled departures | 12,547 | 12,659 | 143,447 | 605,648 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| B6 JetBlue Airways | 3,417 | 27% | 78.0% | 3.8 min | 0.4% |
| YX Republic Airline | 2,773 | 22% | 70.3% | 13.2 min | 1.3% |
| DL Delta Air Lines | 2,272 | 18% | 73.5% | 10.6 min | 0.4% |
| AA American Airlines | 1,419 | 11% | 75.1% | 9.0 min | 1.1% |
| UA United Airlines | 1,121 | 9% | 75.5% | 6.8 min | 1.1% |
| WN Southwest Airlines | 583 | 5% | 73.9% | 13.1 min | 0.2% |
| NK Spirit Airlines | 381 | 3% | 67.7% | 18.4 min | 2.4% |
| AS Alaska Airlines | 254 | 2% | 75.6% | -3.2 min | 1.2% |
| MQ Envoy Air | 150 | 1% | 76.7% | 7.3 min | 0.7% |
| F9 Frontier Airlines | 89 | 1% | 74.2% | 8.2 min | 2.2% |
| G4 Allegiant Air | 68 | 1% | 88.2% | -3.6 min | 0.0% |
| HA Hawaiian Airlines | 20 | 0% | 85.0% | -11.8 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| BOS–DCA | Boston to Washington | 800 | 69.0% | 13.9 min | 1.1% |
| BOS–ORD | Boston to Chicago | 646 | 74.9% | 12.6 min | 0.8% |
| BOS–LGA | Boston to New York | 554 | 71.1% | 13.9 min | 2.3% |
| BOS–ATL | Boston to Atlanta | 459 | 73.6% | 12.1 min | 0.2% |
| BOS–JFK | Boston to New York | 456 | 68.4% | 14.8 min | 1.1% |
| BOS–PHL | Boston to Philadelphia | 447 | 68.9% | 14.2 min | 0.9% |
| BOS–LAX | Boston to Los Angeles | 436 | 86.0% | -7.1 min | 0.0% |
| BOS–SFO | Boston to San Francisco | 432 | 85.6% | -11.6 min | 0.2% |
| BOS–CLT | Boston to Charlotte | 399 | 78.7% | 7.4 min | 0.5% |
| BOS–DFW | Boston to Dallas/Fort Worth | 378 | 65.9% | 18.8 min | 1.6% |
| BOS–MCO | Boston to Orlando | 367 | 69.8% | 11.6 min | 1.1% |
| BOS–BWI | Boston to Baltimore | 353 | 74.2% | 15.8 min | 0.3% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left BOS on time in May 2025?
75.1% of 12,547 scheduled domestic departures left less than 15 minutes late, and 74.4% reached their destination on time. The national figures that month were 76.7% and 75.4%.
How does that compare with a year earlier?
In May 2024, 77.2% of 12,659 departures left on time and 0.7% were cancelled, against 75.1% and 0.8% in May 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for BOS · methodology · corrections.