Spirit Airlines BOS to MIA on-time performance
Spirit Airlines nonstop flights from Boston to Miami · Aug 2025 – Jul 2026
On-time arrivals
55%
arrived < 15 min late
Cancelled
5.9%
11 flights
Avg arrival delay
38 min
82 min when late
Rank on route
#4 of 5
route average 78% on time
Key facts
- Spirit Airlines flights on BOS to MIA arrived on time 55% of the time in Aug 2025 – Jul 2026.
- 5.9% were cancelled, and 27% arrived an hour or more late.
- That ranks #4 of 5 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (43%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion43%
- Airline (crew, maintenance, cleaning, fueling)31%
- Late-arriving aircraft25%
- Extreme weather1%
- Security0%
Other airlines on BOS to MIA
- American Airlines83% on time · 13 min avg delay
- Delta Air Lines73% on time · 22 min avg delay
- JetBlue80% on time · 7 min avg delay
- Republic Airways48% on time · 26 min avg delay
Full BOS to MIA comparison →
Spirit Airlines on-time record across all routes →
185 Spirit Airlines flights tracked on this route; 11 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.