Route · SJU → BOS · 2020–2025 BTS data
San Juan to Boston
The SJU–BOS corridor (San Juan, PR → Boston, MA) runs behind the national average, served by 16 carriers across roughly 1,674 miles.
Data updated 2026-06-13
- 72.9%
- On-time
- -6.1 pts
- vs US avg
- 81 min
- Delay when late
- 10,011
- Flights
Cancelled
1.2%
Best Month
Jun 2025 85%
Worst Month
Aug 2025 67%
Distance
1,674 mi
Carriers
16
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 189 | 60 | 3 | 1 | B6,DL,F9,NK |
| Nov 2025 | 120 | 27 | 2 | 2 | DL,B6 |
| Oct 2025 | 98 | 25 | 1 | 0 | B6,DL |
| Sep 2025 | 84 | 21 | 0 | 0 | DL,B6 |
| Aug 2025 | 186 | 61 | 2 | 3 | NK,B6,DL |
| Jul 2025 | 179 | 44 | 5 | 0 | B6,NK,DL |
| Jun 2025 | 163 | 24 | 0 | 0 | B6,DL,NK |
| May 2025 | 156 | 35 | 0 | 0 | B6,DL,F9,NK |
| Apr 2025 | 213 | 39 | 0 | 0 | DL,F9,NK,B6 |
| Mar 2025 | 232 | 53 | 4 | 0 | B6,NK,DL,F9 |
| Feb 2025 | 203 | 46 | 3 | 0 | B6,DL,F9,NK |
| Jan 2025 | 197 | 53 | 4 | 1 | B6,NK,DL,F9 |
| Dec 2024 | 208 | 59 | 1 | 2 | B6,DL,F9,NK |
| Nov 2024 | 163 | 47 | 0 | 0 | B6,DL,F9 |
| Oct 2024 | 122 | 32 | 0 | 1 | DL,F9,B6 |
| Sep 2024 | 119 | 30 | 1 | 0 | B6,DL,F9 |
| Aug 2024 | 230 | 69 | 7 | 1 | B6,DL,F9,NK |
| Jul 2024 | 239 | 54 | 4 | 1 | B6,DL,F9,NK |
| Jun 2024 | 221 | 64 | 3 | 3 | B6,DL,F9,NK |
| May 2024 | 171 | 37 | 2 | 0 | B6,DL,NK |
| Apr 2024 | 180 | 38 | 2 | 1 | B6,DL,NK |
| Mar 2024 | 174 | 45 | 2 | 1 | B6,DL,NK |
| Feb 2024 | 164 | 49 | 2 | 0 | B6,DL,NK |
| Jan 2024 | 168 | 37 | 1 | 0 | B6,DL,NK |
Cancellation Rate
1.2%
49 of 4,179 flights
Diversion Rate
0.4%
17 of 4,179 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SJU - San Juan
Full on-time, delay-cause, and seasonal performance for San Juan, PR.
Origin airport →BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
Destination airport →Compare the two airports
See SJU and BOS side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SJU–BOS.
Routes with a similar on-time rate
What the Data Says About SJU to BOS
On-time performance on the SJU to BOS pairing (San Juan to Boston) trails a chunk of the network: 72.9% of 10,011 tracked flights arrived on schedule, with a 80.9-minute average delay on the ones that ran late. The route spans about 1,674 miles across 16 carriers. Cancellations over the trailing 24 months hit 1.2% (49 of 4,179 flights), with 0.4% diverted.
The monthly split is wide on this route: Jun 2025 posted the strongest performance at 85% on-time, while Aug 2025 came in at just 67% - a 18-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.