Route
BOS → SJU
Boston Logan International Airport Luis Munoz Marin International Airport
How punctual is this route?
- On-time arrivals
- 66.8%
- Less than 15 minutes late
- Cancelled
- 3.0%
- Of scheduled flights
- Average delay when late
- 79 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,717
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 34%
- Air traffic control & airport 33%
- Airline (crew, maintenance, cleaning) 30%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 69.9% | 83 |
| October 2025 | 72.0% | 95 |
| November 2025 | 73.4% | 110 |
| December 2025 | 58.6% | 170 |
| January 2026 | 58.9% | 170 |
| February 2026 | 55.8% | 178 |
| March 2026 | 67.5% | 204 |
| April 2026 | 72.0% | 187 |
| May 2026 | 78.6% | 140 |
| June 2026 | 73.0% | 126 |
| July 2026 | 60.2% | 126 |
| August 2026 | 68.5% | 128 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| JetBlue Airways | 1,142 | 66.5% | 2.8% | 76 min |
| Delta Air Lines | 398 | 74.5% | 1.5% | 62 min |
| NK | 143 | 52.7% | 8.4% | 109 min |
| Frontier Airlines | 34 | 42.4% | 2.9% | 116 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL1780
24% late · 365 flights
-
B6861
27% late · 364 flights
-
B6561
52% late · 274 flights
-
B6161
41% late · 170 flights
-
B6761
12% late · 104 flights
-
B6261
33% late · 95 flights
-
NK3013
42% late · 91 flights
-
B6661
21% late · 73 flights
-
B61161
18% late · 51 flights
-
F93001
58% late · 34 flights
-
NK310
72% late · 21 flights
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