Boston Logan International Airport (BOS): Delays & On-Time Performance
Data through July 2026
Boston Logan International Airport (BOS) is a tale of two seasons: departures ran 87% on-time in October 2024 but sank to 70% in July 2026. Across the year it averages 78% against a national 78%, over roughly 393 departures a day to 87 destinations.
- Departures on-time
- 78%
- left <15 min late
- Avg dep delay
- 17 min
- Arrivals on-time
- 75%
- Cancelled
- 2.2%
- Destinations
- 87
- nonstop
- Airlines
- 12
Plan your departure from BOS
The choices most likely to improve your odds, based on this airport’s historical record.
- Best departure time
- Around 5 a.m.
- 93% on-time
- Best day to fly
- Wednesday
- 80% on-time
- Cancellation risk
- 2.2%
- above the US average
Monthly on-time trend
Best time of day to depart from BOS
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 19 min |
| Tuesday | 80% | 15 min |
| Wednesdaybest | 80% | 14 min |
| Thursday | 74% | 19 min |
| Friday | 75% | 18 min |
| Saturday | 78% | 16 min |
| Sunday | 73% | 21 min |
Busiest routes from BOS
Where flights into BOS come from
| Route | Flights/12mo | On-time | Avg delay |
|---|---|---|---|
| DCA (Washington) → BOS | 9,090 | 75% | 21 min |
| ORD (Chicago) → BOS | 7,755 | 71% | 23 min |
| LGA (New York) → BOS | 7,343 | 77% | 18 min |
| JFK (New York) → BOS | 5,676 | 74% | 21 min |
| PHL (Philadelphia) → BOS | 4,978 | 76% | 20 min |
| ATL (Atlanta) → BOS | 4,977 | 74% | 18 min |
| LAX (Los Angeles) → BOS | 4,761 | 80% | 16 min |
| SFO (San Francisco) → BOS | 4,733 | 78% | 16 min |
What causes delays at BOS
Share of total delay minutes by cause, as reported by carriers to the US DOT, weighted across routes departing BOS.
- Late-arriving aircraft40%
- Airline operations30%
- National airspace system27%
- Weather3%
Alternative airports near Boston
Other airports within 120 miles, compared on departure reliability.
| Airport | Distance | On-time departures | Avg delay |
|---|---|---|---|
| ORH — Worcester Regional Airport | 45 mi | 78% | 23 min |
| MHT — Manchester-Boston Regional Airport | 45 mi | 82% | 16 min |
| PVD — Rhode Island T. F. Green International Airport | 49 mi | 81% | 16 min |
| MVY — Martha's Vineyard Airport | 70 mi | 77% | 24 min |
| ACK — Nantucket Memorial Airport | 91 mi | 77% | 22 min |
Compare the airport-level record first, then check the exact route you plan to book.
Airline performance at BOS
| Airline | On-time departures | Avg delay | Flights |
|---|---|---|---|
| Allegiant Air | 87% | 11 min | 1,300 |
| United Airlines | 82% | 16 min | 26,908 |
| Republic Airways | 81% | 14 min | 66,280 |
| Envoy Air | 80% | 16 min | 4,229 |
| American Airlines | 79% | 20 min | 34,935 |
| Delta Air Lines | 79% | 17 min | 54,484 |
| Alaska Airlines | 78% | 14 min | 5,245 |
| Hawaiian Airlines | 77% | 22 min | 313 |
| JetBlue Airways | 74% | 19 min | 82,071 |
| Frontier Airlines | 74% | 21 min | 2,866 |
| Spirit Airlines | 71% | 24 min | 8,768 |
| Southwest Airlines | 70% | 20 min | 14,665 |
Frequently asked questions
- How often are flights delayed at BOS?
- 22% of departures from Boston Logan International Airport left 15+ minutes late between 2024-07 and 2026-07, with an average departure delay of 17 minutes. The national on-time average over the same period was 78%.
- What is the best time of day to depart from BOS?
- Flights scheduled around 5 a.m. depart on time 93% of the time at BOS, versus 59% around 8 p.m.. Booking before noon is the usual rule of thumb here.
- What is the worst month for delays at BOS?
- In this dataset, July 2026 was the weakest month at BOS, with 70% of departures on time.
- How often are flights cancelled at BOS?
- 2.2% of scheduled departures from BOS were cancelled in this period, compared with a national rate of 1.6%.
Popular route pages from this airport
Related guides
Based on 302,064 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.