Route
SJU → BOS
Luis Munoz Marin International Airport Boston Logan International Airport
How punctual is this route?
- On-time arrivals
- 70.8%
- Less than 15 minutes late
- Cancelled
- 3.2%
- Of scheduled flights
- Average delay when late
- 77 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,916
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 54%
- Airline (crew, maintenance, cleaning) 28%
- Air traffic control & airport 17%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 75.0% | 84 |
| October 2025 | 74.2% | 98 |
| November 2025 | 76.7% | 120 |
| December 2025 | 67.6% | 189 |
| January 2026 | 63.6% | 207 |
| February 2026 | 66.1% | 207 |
| March 2026 | 75.3% | 235 |
| April 2026 | 69.8% | 215 |
| May 2026 | 82.1% | 145 |
| June 2026 | 79.3% | 136 |
| July 2026 | 63.8% | 139 |
| August 2026 | 61.2% | 141 |
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 | 1,342 | 68.5% | 3.6% | 80 min |
| Delta Air Lines | 398 | 77.4% | 1.5% | 73 min |
| NK | 142 | 73.3% | 4.2% | 62 min |
| Frontier Airlines | 34 | 69.7% | 2.9% | 50 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL1780
21% late · 324 flights
-
B6862
30% late · 297 flights
-
B61462
36% late · 189 flights
-
B6162
20% late · 184 flights
-
B6562
21% late · 152 flights
-
B6808
36% late · 152 flights
-
NK3012
18% late · 91 flights
-
B6462
44% late · 89 flights
-
B6762
48% late · 86 flights
-
B6662
34% late · 69 flights
-
B6908
33% late · 46 flights
-
F93002
30% late · 34 flights
-
DL403
20% late · 25 flights
-
B6262
62% late · 23 flights
-
B642
0% late · 22 flights
-
NK309
56% late · 21 flights
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