Delta Air Lines MIA to BOS on-time performance
Delta Air Lines nonstop flights from Miami to Boston · Aug 2025 – Jul 2026
On-time arrivals
71%
arrived < 15 min late
Cancelled
2.8%
25 flights
Avg arrival delay
24 min
79 min when late
Rank on route
#4 of 6
route average 70% on time
Key facts
- Delta Air Lines flights on MIA to BOS arrived on time 71% of the time in Aug 2025 – Jul 2026.
- 2.8% were cancelled, and 11% arrived an hour or more late.
- That ranks #4 of 6 airlines on this route, which averaged 70% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (42%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)42%
- Late-arriving aircraft33%
- Air traffic control & airport congestion24%
- Extreme weather2%
- Security0%
Other airlines on MIA to BOS
- American Airlines71% on time · 22 min avg delay
- Spirit Airlines55% on time · 32 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 →
Delta Air Lines on-time record across all routes →
889 Delta Air Lines flights tracked on this route; 25 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.