Delta Air Lines BOS to MIA on-time performance
Delta Air Lines nonstop flights from Boston to Miami · Aug 2025 – Jul 2026
On-time arrivals
73%
arrived < 15 min late
Cancelled
2.6%
23 flights
Avg arrival delay
22 min
78 min when late
Rank on route
#3 of 5
route average 78% on time
Key facts
- Delta Air Lines flights on BOS to MIA arrived on time 73% of the time in Aug 2025 – Jul 2026.
- 2.6% were cancelled, and 10% arrived an hour or more late.
- That ranks #3 of 5 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (45%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)45%
- Late-arriving aircraft32%
- Air traffic control & airport congestion23%
- Extreme weather1%
- Security0%
Other airlines on BOS to MIA
- American Airlines83% on time · 13 min avg delay
- Spirit Airlines55% on time · 38 min avg delay
- JetBlue80% on time · 7 min avg delay
- Republic Airways48% on time · 26 min avg delay
Full BOS to MIA comparison →
Delta Air Lines on-time record across all routes →
891 Delta Air Lines flights tracked on this route; 23 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.