Airport month record
BOSJUN
Boston Logan International in June 2026
- Departures
- 12,683
- Month
- June 2026
- National, same month
- 74.3%
- Carriers
- 10
Historical statistics for June 2026, not live status or a forecast for this year’s June. For today’s conditions at BOS, see live FAA status.
BOS in June lands a B, 2 points better than the national rate of 74.3%. 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 12,683 flights, of which Republic Airways flew 3,121 at 81.4% on time.
Republic Airways is the most reliable of the six carriers covered here at 81.4% on time across 3,121 flights.
Key figures
On time
76.6%
Arrivals under 15 minutes late, of 12,420 completed departures
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
1.77%
Nationally in June: 1.65%
Whole year
74.6%
BOS across all twelve months
These figures cover 12,683 departures from Boston Logan International in June 2026. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.
Against the year
June next to BOS's other months
Against BOS's own year, June ran 2 points better than the twelve-month rate of 74.6%, which makes it number four of twelve months, best first. Cancellations were unusually low for BOS in June, at 1.77% against 3.05% across the year. Either side of it, May ran 79.4% on time and July 70.8%, so this month sits in line with its neighbours.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| September 2025 | 11,597 | 75.7% | 73 min | 1.35% | B |
| October 2025 | 12,647 | 73.9% | 75 min | 1.51% | C |
| November 2025 | 11,385 | 78.0% | 75 min | 2.76% | B |
| December 2025 | 11,248 | 68.7% | 71 min | 1.69% | C |
| January 2026 | 10,298 | 73.6% | 78 min | 7.50% | C− |
| February 2026 | 10,232 | 74.8% | 73 min | 8.15% | C− |
| March 2026 | 12,299 | 74.1% | 69 min | 2.69% | C |
| April 2026 | 12,626 | 79.3% | 62 min | 0.31% | B+ |
| May 2026 | 12,694 | 79.4% | 60 min | 0.61% | B+ |
| June 2026 (this page) | 12,683 | 76.6% | 72 min | 1.77% | B |
| July 2026 | 13,277 | 70.8% | 83 min | 5.92% | C− |
| August 2026 | 13,188 | 69.8% | 82 min | 3.60% | C− |
Departure window
The best time of day to leave BOS in June
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 32 points, against 18 points between the best and worst carrier.
- 5am–8am2,538 flights90.7%
- 8am–11am2,663 flights87.0%
- 11am–2pm1,909 flights78.5%
- 2pm–5pm2,140 flights71.4%
- 5pm–8pm2,193 flights60.4%
- 8pm–5am1,240 flights59.0%
Scale runs 50% to 95%.
The 8pm–5am window is where this operation falls apart: 59.0% on time, against 90.7% 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 8am–11am window is the busiest, with 2,663 flights scheduled in it.
Across the week, Tuesday is the strongest day at 81.9% on time and Sunday the weakest at 68.4%, a spread of 14 points.
Carrier by carrier
Which airlines ran best at BOS in June
The choice of carrier is not cosmetic here. Republic Airways arrives on time 81.4% of the time; Southwest Airlines manages 63.5%. Sample sizes sit next to every figure, because a two-point gap across 722 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 3,156 | 72.4% | 71 min | 1.62% | C |
| Republic Airways | 3,121 | 81.4% | 71 min | 2.44% | B |
| Delta Air Lines | 2,292 | 77.2% | 69 min | 1.35% | B |
| American Airlines | 1,593 | 81.3% | 91 min | 2.39% | B |
| United Airlines | 1,217 | 74.9% | 79 min | 1.07% | C |
| Southwest Airlines | 722 | 63.5% | 64 min | 0.69% | D+ |
| Alaska Airlinesthin sample | 240 | 76.6% | 43 min | 0.42% | B+ |
| Envoy Airthin sample | 198 | 84.3% | 81 min | 3.03% | B− |
| Frontier Airlinesthin sample | 77 | 75.3% | 55 min | 5.19% | B− |
| Allegiant Airthin sample | 67 | 76.1% | 83 min | 0.00% | B+ |
The spread between Republic and Southwest is 18 points, wide enough that it should decide the booking. On a hundred trips that is 18 more arrivals inside the on-time window.
Route by route
Busiest routes out of BOS in June
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| BOS to DCA · Washington | 757 | 74.2% | 74 min | 3.43% | C− |
| BOS to ORD · Chicago | 750 | 76.8% | 108 min | 2.80% | B |
| BOS to LGA · New York | 661 | 81.2% | 87 min | 4.39% | B− |
| BOS to SFO · San Francisco | 502 | 56.5% | 61 min | 1.00% | D |
| BOS to ATL · Atlanta | 465 | 83.0% | 74 min | 1.29% | B |
| BOS to PHL · Philadelphia | 458 | 79.9% | 89 min | 2.18% | B |
| BOS to LAX · Los Angeles | 452 | 68.8% | 55 min | 0.66% | C+ |
| BOS to JFK · New York | 430 | 74.0% | 77 min | 5.35% | C− |
| BOS to DEN · Denver | 374 | 71.0% | 53 min | 0.27% | C+ |
| BOS to CLT · Charlottethin sample | 352 | 88.2% | 91 min | 0.85% | A+ |
| BOS to DFW · Dallas-Fort Worththin sample | 330 | 71.6% | 76 min | 5.15% | C− |
| BOS to EWR · Newarkthin sample | 327 | 77.6% | 99 min | 3.06% | B− |
| BOS to BWI · Baltimorethin sample | 303 | 77.1% | 72 min | 0.66% | B+ |
| BOS to MCO · Orlandothin sample | 285 | 73.8% | 71 min | 1.05% | C |
| BOS to SEA · Seattlethin sample | 278 | 74.5% | 68 min | 1.08% | C |
| BOS to BNA · Nashvillethin sample | 268 | 63.5% | 63 min | 0.37% | D+ |
| BOS to MIA · Miamithin sample | 264 | 86.7% | 101 min | 0.00% | A+ |
| BOS to RDU · Raleighthin sample | 242 | 79.4% | 86 min | 3.72% | B− |
| BOS to DTW · Detroitthin sample | 221 | 71.2% | 79 min | 2.26% | C |
| BOS to PIT · Pittsburghthin sample | 221 | 80.2% | 75 min | 4.07% | B− |
| BOS to TPA · Tampathin sample | 204 | 79.2% | 66 min | 0.49% | B+ |
| BOS to SAN · San Diegothin sample | 203 | 66.3% | 49 min | 0.49% | C+ |
| BOS to IAH · Houstonthin sample | 187 | 79.1% | 78 min | 0.00% | B+ |
| BOS to FLL · Fort Lauderdalethin sample | 179 | 77.6% | 72 min | 1.68% | B |
| BOS to IND · Indianapolisthin sample | 177 | 85.3% | 59 min | 0.00% | A+ |
Delay causes
What held BOS up in June
Late-arriving aircraft accounts for 44% of the 210,000 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 30%National Airspace System
- 25%Carrier
- 1%Extreme weather
- 0%Security
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 210,000 reported delay minutes here, that single category outweighs weather by 29 to one. The split is drawn from 210,168 reported delay minutes.
Cancellations sit at 1.77% against a national 1.65%, which is ordinary. Diversions add another 0.30%.
9.5% of arrivals land a full hour or more behind schedule, against 9.7% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
What to do with this
Flying from BOS in June
For a June trip through BOS: expect 76.6% on time and 1.77% cancelled, going by June 2026. The 5am–8am window was the strongest part of the day.
Related
Where to go next
- Boston Logan International (BOS), the whole year
- BOS in September75.7%
- BOS in October73.9%
- BOS in November78.0%
- BOS in December68.7%
- BOS in January73.6%
- BOS in February74.8%
- BOS in March74.1%
- BOS in April79.3%
- BOS in May79.4%
- BOS in July70.8%
- BOS in August69.8%
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.