Spirit Airlines MIA to BOS on-time performance
Spirit Airlines nonstop flights from Miami to Boston · Aug 2025 – Jul 2026
On-time arrivals
55%
arrived < 15 min late
Cancelled
6.5%
12 flights
Avg arrival delay
32 min
69 min when late
Rank on route
#6 of 6
route average 70% on time
Key facts
- Spirit Airlines flights on MIA to BOS arrived on time 55% of the time in Aug 2025 – Jul 2026.
- 6.5% were cancelled, and 26% arrived an hour or more late.
- That ranks #6 of 6 airlines on this route, which averaged 70% 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%
- Late-arriving aircraft37%
- Airline (crew, maintenance, cleaning, fueling)16%
- Extreme weather0%
- Security0%
Other airlines on MIA to BOS
- American Airlines71% on time · 22 min avg delay
- Delta Air Lines71% on time · 24 min avg delay
- JetBlue74% on time · 12 min avg delay
- Republic Airways81% on time · 20 min avg delay
- Envoy Air100% on time · 7 min avg delay
Full MIA to BOS comparison →
Spirit Airlines on-time record across all routes →
184 Spirit Airlines flights tracked on this route; 12 cancelled, 1 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.