Airport reliability
Boston (BOS) on-time performance
How reliably flights leave Boston, MA (BOS) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Boston, MA144,174 departures in 12 months
- Departures on time
- 72.1% U.S. average 75.6%
- Cancelled
- 3.0% U.S. average 1.9%
- 60+ minutes late
- 9.8% U.S. average 8.1%
- Scheduled departures
- 144,174 12 months
What this means
BOS departures ran below the U.S. average.
- 72.1% of the 144,174 scheduled departures from Boston (BOS) arrived at their destination on time, 3.5 points lower than the U.S. average of 75.6%.
- 3.0% of departures were cancelled (U.S. average 1.9%), and 9.8% arrived an hour or more late.
- Flights arriving at BOS were on time 70.2% of the time.
- Among airlines with at least 300 departures, Allegiant Air was the most punctual from BOS (81.6%) and Spirit Airlines the least (58.0%).
- Over the last 3 years, November was the most reliable month for departures from BOS (82.3% on time) and July the least reliable (68.0%).
- Cancellations peaked in January, when 4.3% of flights were cancelled.
- Flights scheduled to depart before 6 am were the most punctual (89.3% on time); flights scheduled to depart 10 pm to 11 pm were the least (54.2%).
Airlines at BOS
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| Allegiant Air | 81.6% | 0.7% | 6.1% | 79 min | 586 |
| Envoy AirSold as American Eagle | 77.1% | 2.3% | 10.0% | 86 min | 2,055 |
| United Airlines | 76.0% | 1.9% | 8.6% | 78 min | 13,042 |
| American Airlines | 75.9% | 2.5% | 9.1% | 93 min | 17,138 |
| Delta Air Lines | 74.2% | 2.2% | 9.0% | 73 min | 26,567 |
| Republic AirwaysSold as American Eagle, Delta Connection, United Express | 73.7% | 4.4% | 8.8% | 68 min | 34,798 |
| Alaska Airlines | 70.0% | 1.4% | 7.6% | 57 min | 2,420 |
| Southwest Airlines | 67.8% | 1.7% | 10.4% | 62 min | 7,340 |
| JetBlue Airways | 67.5% | 3.4% | 11.9% | 71 min | 37,517 |
| Frontier Airlines | 66.5% | 1.8% | 9.4% | 65 min | 926 |
| Spirit Airlines | 58.0% | 5.9% | 16.5% | 80 min | 1,737 |
| Hawaiian Airlines | Insufficient sample | 48 | |||
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On-time rate by departure hour
Share of scheduled flights on time BOS average 72.1%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing before 6 am | 89.3% | 4,244 |
| Departing 6 am to 7 am | 86.2% | 11,372 |
| Departing 7 am to 8 am | 83.1% | 14,034 |
| Departing 8 am to 9 am | 81.8% | 11,635 |
| Departing 9 am to 10 am | 80.7% | 10,070 |
| Departing 10 am to 11 am | 79.1% | 8,391 |
| Departing 11 am to noon | 76.5% | 8,140 |
| Departing noon to 1 pm | 73.8% | 7,590 |
| Departing 1 pm to 2 pm | 74.0% | 6,657 |
| Departing 2 pm to 3 pm | 71.3% | 6,843 |
| Departing 3 pm to 4 pm | 65.4% | 9,631 |
| Departing 4 pm to 5 pm | 61.7% | 8,785 |
| Departing 5 pm to 6 pm | 58.5% | 9,982 |
| Departing 6 pm to 7 pm | 59.9% | 8,377 |
| Departing 7 pm to 8 pm | 55.3% | 7,982 |
| Departing 8 pm to 9 pm | 55.6% | 7,723 |
| Departing 9 pm to 10 pm | 55.0% | 2,452 |
| Departing 10 pm to 11 pm | 54.2% | 260 |
| Departing 11 pm to midnight | Insufficient sample | 6 |
Best and worst months at BOS
Share of scheduled flights on time 12-month average 72.1%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 72.5% | 31,056 |
| February | 73.8% | 30,642 |
| March | 78.4% | 35,984 |
| April | 79.6% | 36,630 |
| May | 76.7% | 37,900 |
| June | 73.8% | 37,623 |
| July | 68.0% | 39,142 |
| August | 72.3% | 38,864 |
| September | 76.6% | 35,698 |
| October | 80.3% | 38,051 |
| November | 82.3% | 34,283 |
| December | 74.6% | 33,686 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 74.6% | 11,597 |
| Oct 2025 | 72.6% | 12,647 |
| Nov 2025 | 75.7% | 11,385 |
| Dec 2025 | 67.3% | 11,248 |
| Jan 2026 | 67.9% | 10,298 |
| Feb 2026 | 68.5% | 10,232 |
| Mar 2026 | 71.8% | 12,299 |
| Apr 2026 | 78.9% | 12,626 |
| May 2026 | 78.7% | 12,694 |
| Jun 2026 | 75.0% | 12,683 |
| Jul 2026 | 66.3% | 13,277 |
| Aug 2026 | 67.0% | 13,188 |
Busiest routes from BOS
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| Washington (DCA) | 69.4% | 4.1% | 5 | 9,105 |
| Chicago (ORD) | 69.4% | 3.0% | 6 | 7,860 |
| New York (LGA) | 71.3% | 6.4% | 2 | 7,442 |
| New York (JFK) | 70.0% | 5.6% | 3 | 5,614 |
| Atlanta (ATL) | 74.9% | 2.2% | 4 | 5,050 |
| Philadelphia (PHL) | 73.4% | 3.5% | 4 | 5,036 |
| San Francisco (SFO) | 67.9% | 1.6% | 5 | 4,817 |
| Los Angeles (LAX) | 72.2% | 1.8% | 4 | 4,794 |
| Orlando (MCO) | 66.9% | 3.2% | 6 | 4,605 |
| Charlotte (CLT) | 79.7% | 2.6% | 4 | 4,009 |
| Newark (EWR) | 72.2% | 4.5% | 2 | 3,860 |
| Denver (DEN) | 74.3% | 1.4% | 4 | 3,847 |
| Dallas/Fort Worth (DFW) | 74.4% | 3.1% | 4 | 3,692 |
| Baltimore (BWI) | 75.8% | 2.9% | 3 | 3,536 |
| Miami (MIA) | 76.2% | 2.2% | 5 | 3,368 |
| Fort Lauderdale (FLL) | 63.9% | 3.8% | 3 | 3,306 |
| Nashville (BNA) | 67.0% | 2.6% | 6 | 2,939 |
| Raleigh/Durham (RDU) | 73.1% | 2.9% | 4 | 2,848 |
| Tampa (TPA) | 71.9% | 3.1% | 4 | 2,780 |
| Detroit (DTW) | 73.5% | 2.8% | 4 | 2,575 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Boston, MA (BOS) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.