Frontier Airlines BOS to SJU on-time performance
Frontier Airlines nonstop flights from Boston to San Juan · Aug 2025 – Jul 2026
On-time arrivals
42%
arrived < 15 min late
Cancelled
2.9%
1 flights
Avg arrival delay
67 min
113 min when late
Rank on route
#4 of 4
route average 67% on time
Key facts
- Frontier Airlines flights on BOS to SJU arrived on time 42% of the time in Aug 2025 – Jul 2026.
- 2.9% were cancelled, and 33% arrived an hour or more late.
- That ranks #4 of 4 airlines on this route, which averaged 67% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (47%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion47%
- Airline (crew, maintenance, cleaning, fueling)33%
- Late-arriving aircraft19%
- Extreme weather1%
- Security0%
Other airlines on BOS to SJU
- JetBlue67% on time · 25 min avg delay
- Delta Air Lines75% on time · 16 min avg delay
- Spirit Airlines53% on time · 51 min avg delay
Full BOS to SJU comparison →
Frontier Airlines on-time record across all routes →
34 Frontier Airlines flights tracked on this route; 1 cancelled, 0 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.