Delta Air Lines SJU to BOS on-time performance
Delta Air Lines nonstop flights from San Juan to Boston · Aug 2025 – Jul 2026
On-time arrivals
77%
arrived < 15 min late
Cancelled
1.5%
6 flights
Avg arrival delay
16 min
68 min when late
Rank on route
#1 of 4
route average 71% on time
Key facts
- Delta Air Lines flights on SJU to BOS arrived on time 77% of the time in Aug 2025 – Jul 2026.
- 1.5% were cancelled, and 6% arrived an hour or more late.
- That ranks #1 of 4 airlines on this route, which averaged 71% on time overall.
- The largest source of delay minutes was late-arriving aircraft (45%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft45%
- Airline (crew, maintenance, cleaning, fueling)39%
- Air traffic control & airport congestion16%
- Extreme weather0%
- Security0%
Other airlines on SJU to BOS
- JetBlue69% on time · 25 min avg delay
- Spirit Airlines73% on time · 16 min avg delay
- Frontier Airlines70% on time · 15 min avg delay
Full SJU to BOS comparison →
Delta Air Lines on-time record across all routes →
398 Delta Air Lines flights tracked on this route; 6 cancelled, 4 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.